FlatCAM/FlatCAM.py

############################################################
# FlatCAM: 2D Post-processing for Manufacturing            #
# http://caram.cl/software/flatcam                         #
# Author: Juan Pablo Caram (c)                             #
# Date: 2/5/2014                                           #
# MIT Licence                                              #
############################################################

import threading

# TODO: Bundle together. This is just for debugging.
from docutils.nodes import image
from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import GdkPixbuf
from gi.repository import GLib
from gi.repository import GObject
import simplejson as json
import traceback

import matplotlib
from matplotlib.figure import Figure
from numpy import arange, sin, pi
from matplotlib.backends.backend_gtk3agg import FigureCanvasGTK3Agg as FigureCanvas
#from mpl_toolkits.axes_grid.anchored_artists import AnchoredText


import sys
import urllib
import copy
import random

from shapely import speedups

########################################
##      Imports part of FlatCAM       ##
########################################
from camlib import *
from FlatCAMObj import *
from FlatCAMWorker import Worker
from FlatCAMException import *


########################################
##                App                 ##
########################################
class App:
    """
    The main application class. The constructor starts the GUI.
    """

    version_url = "http://caram.cl/flatcam/VERSION"

    def __init__(self):
        """
        Starts the application. Takes no parameters.

        :return: app
        :rtype: App
        """

        if speedups.available:
            speedups.enable()

        # Needed to interact with the GUI from other threads.
        GObject.threads_init()

        # GLib.log_set_handler()

        #### GUI ####
        # Glade init
        self.gladefile = "FlatCAM.ui"
        self.builder = Gtk.Builder()
        self.builder.add_from_file(self.gladefile)

        # References to UI widgets
        self.window = self.builder.get_object("window1")
        self.position_label = self.builder.get_object("label3")
        self.grid = self.builder.get_object("grid1")
        self.notebook = self.builder.get_object("notebook1")
        self.info_label = self.builder.get_object("label_status")
        self.progress_bar = self.builder.get_object("progressbar")
        self.progress_bar.set_show_text(True)
        self.units_label = self.builder.get_object("label_units")
        self.toolbar = self.builder.get_object("toolbar_main")

        # White (transparent) background on the "Options" tab.
        self.builder.get_object("vp_options").override_background_color(Gtk.StateType.NORMAL,
                                                                        Gdk.RGBA(1, 1, 1, 1))
        # Combo box to choose between project and application options.
        self.combo_options = self.builder.get_object("combo_options")
        self.combo_options.set_active(1)

        #self.setup_project_list()  # The "Project" tab
        self.setup_component_editor()  # The "Selected" tab

        ## Setup the toolbar. Adds buttons.
        self.setup_toolbar()

        #### Event handling ####
        self.builder.connect_signals(self)

        #### Make plot area ####
        self.plotcanvas = PlotCanvas(self.grid)
        self.plotcanvas.mpl_connect('button_press_event', self.on_click_over_plot)
        self.plotcanvas.mpl_connect('motion_notify_event', self.on_mouse_move_over_plot)
        self.plotcanvas.mpl_connect('key_press_event', self.on_key_over_plot)

        self.setup_tooltips()

        # TODO: Hardcoded list
        for kind in ['gerber', 'excellon', 'geometry', 'cncjob']:
            entry_name = self.builder.get_object("entry_text_" + kind + "_name")
            entry_name.connect("activate", self.on_activate_name)

        #### DATA ####
        self.clipboard = Gtk.Clipboard.get(Gdk.SELECTION_CLIPBOARD)
        self.setup_obj_classes()
        self.mouse = None  # Mouse coordinates over plot
        self.recent = []
        self.collection = ObjectCollection()
        self.builder.get_object("box_project").pack_start(self.collection.view, False, False, 1)
        # TODO: Do this different
        self.collection.view.connect("row_activated", self.on_row_activated)

        # Used to inhibit the on_options_update callback when
        # the options are being changed by the program and not the user.
        self.options_update_ignore = False

        self.toggle_units_ignore = False

        self.defaults = {
            "units": "in"
        }  # Application defaults

        ## Current Project ##
        self.options = {}  # Project options
        self.project_filename = None

        self.form_kinds = {
            "units": "radio"
        }

        self.radios = {"units": {"rb_inch": "IN", "rb_mm": "MM"},
                       "gerber_gaps": {"rb_app_2tb": "tb", "rb_app_2lr": "lr", "rb_app_4": "4"}}
        self.radios_inv = {"units": {"IN": "rb_inch", "MM": "rb_mm"},
                           "gerber_gaps": {"tb": "rb_app_2tb", "lr": "rb_app_2lr", "4": "rb_app_4"}}

        # Options for each kind of FlatCAMObj.
        # Example: 'gerber_plot': 'cb'. The widget name would be: 'cb_app_gerber_plot'
        for FlatCAMClass in [FlatCAMExcellon, FlatCAMGeometry, FlatCAMGerber, FlatCAMCNCjob]:
            obj = FlatCAMClass("no_name")
            for option in obj.form_kinds:
                self.form_kinds[obj.kind + "_" + option] = obj.form_kinds[option]
                # if obj.form_kinds[option] == "radio":
                #     self.radios.update({obj.kind + "_" + option: obj.radios[option]})
                #     self.radios_inv.update({obj.kind + "_" + option: obj.radios_inv[option]})

        ## Event subscriptions ##

        ## Tools ##
        self.measure = Measurement(self.builder.get_object("box39"), self.plotcanvas)
        # Toolbar icon
        # TODO: Where should I put this? Tool should have a method to add to toolbar?
        meas_ico = Gtk.Image.new_from_file('share/measure32.png')
        measure = Gtk.ToolButton.new(meas_ico, "")
        measure.connect("clicked", self.measure.toggle_active)
        measure.set_tooltip_markup("<b>Measure Tool:</b> Enable/disable tool.\n" +
                                   "Click on point to set reference.\n" +
                                   "(Click on plot and hit <b>m</b>)")
        self.toolbar.insert(measure, -1)

        #### Initialization ####
        self.load_defaults()
        self.options.update(self.defaults)  # Copy app defaults to project options
        self.options2form()  # Populate the app defaults form
        self.units_label.set_text("[" + self.options["units"] + "]")
        self.setup_recent_items()

        self.worker = Worker()
        self.worker.daemon = True
        self.worker.start()

        #### Check for updates ####
        # Separate thread (Not worker)
        self.version = 4
        t1 = threading.Thread(target=self.versionCheck)
        t1.daemon = True
        t1.start()

        #### For debugging only ###
        def somethreadfunc(app_obj):
            print "Hello World!"

        t = threading.Thread(target=somethreadfunc, args=(self,))
        t.daemon = True
        t.start()

        ########################################
        ##              START                 ##
        ########################################
        self.icon256 = GdkPixbuf.Pixbuf.new_from_file('share/flatcam_icon256.png')
        self.icon48 = GdkPixbuf.Pixbuf.new_from_file('share/flatcam_icon48.png')
        self.icon16 = GdkPixbuf.Pixbuf.new_from_file('share/flatcam_icon16.png')
        Gtk.Window.set_default_icon_list([self.icon16, self.icon48, self.icon256])
        self.window.set_title("FlatCAM - Alpha 4 UNSTABLE")
        self.window.set_default_size(900, 600)
        self.window.show_all()

    def message_dialog(self, title, message, kind="info"):
        types = {"info": Gtk.MessageType.INFO,
                 "warn": Gtk.MessageType.WARNING,
                 "error": Gtk.MessageType.ERROR}
        dlg = Gtk.MessageDialog(self.window, 0, types[kind], Gtk.ButtonsType.OK, title)
        dlg.format_secondary_text(message)

        def lifecycle():
            dlg.run()
            dlg.destroy()

        GLib.idle_add(lifecycle)

    def question_dialog(self, title, message):
        label = Gtk.Label(message)
        dialog = Gtk.Dialog(title, self.window, 0,
                            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                             Gtk.STOCK_OK, Gtk.ResponseType.OK))
        dialog.set_default_size(150, 100)
        dialog.set_modal(True)
        box = dialog.get_content_area()
        box.set_border_width(10)
        box.add(label)
        dialog.show_all()
        response = dialog.run()
        dialog.destroy()
        return response

    def setup_toolbar(self):

        # Zoom fit
        zf_ico = Gtk.Image.new_from_file('share/zoom_fit32.png')
        zoom_fit = Gtk.ToolButton.new(zf_ico, "")
        zoom_fit.connect("clicked", self.on_zoom_fit)
        zoom_fit.set_tooltip_markup("Zoom Fit.\n(Click on plot and hit <b>1</b>)")
        self.toolbar.insert(zoom_fit, -1)

        # Zoom out
        zo_ico = Gtk.Image.new_from_file('share/zoom_out32.png')
        zoom_out = Gtk.ToolButton.new(zo_ico, "")
        zoom_out.connect("clicked", self.on_zoom_out)
        zoom_out.set_tooltip_markup("Zoom Out.\n(Click on plot and hit <b>2</b>)")
        self.toolbar.insert(zoom_out, -1)

        # Zoom in
        zi_ico = Gtk.Image.new_from_file('share/zoom_in32.png')
        zoom_in = Gtk.ToolButton.new(zi_ico, "")
        zoom_in.connect("clicked", self.on_zoom_in)
        zoom_in.set_tooltip_markup("Zoom In.\n(Click on plot and hit <b>3</b>)")
        self.toolbar.insert(zoom_in, -1)

        # Clear plot
        cp_ico = Gtk.Image.new_from_file('share/clear_plot32.png')
        clear_plot = Gtk.ToolButton.new(cp_ico, "")
        clear_plot.connect("clicked", self.on_clear_plots)
        clear_plot.set_tooltip_markup("Clear Plot")
        self.toolbar.insert(clear_plot, -1)

        # Replot
        rp_ico = Gtk.Image.new_from_file('share/replot32.png')
        replot = Gtk.ToolButton.new(rp_ico, "")
        replot.connect("clicked", self.on_toolbar_replot)
        replot.set_tooltip_markup("Re-plot all")
        self.toolbar.insert(replot, -1)

        # Delete item
        del_ico = Gtk.Image.new_from_file('share/delete32.png')
        delete = Gtk.ToolButton.new(del_ico, "")
        delete.connect("clicked", self.on_delete)
        delete.set_tooltip_markup("Delete selected\nobject.")
        self.toolbar.insert(delete, -1)

    def setup_obj_classes(self):
        """
        Sets up application specifics on the FlatCAMObj class.

        :return: None
        """
        FlatCAMObj.app = self

    def setup_component_editor(self):
        """
        Initial configuration of the component editor. Creates
        a page titled "Selection" on the notebook on the left
        side of the main window.

        :return: None
        """

        box_selected = self.builder.get_object("box_selected")

        # Remove anything else in the box
        box_children = box_selected.get_children()
        for child in box_children:
            box_selected.remove(child)

        box1 = Gtk.Box(Gtk.Orientation.VERTICAL)
        label1 = Gtk.Label("Choose an item from Project")
        box1.pack_start(label1, True, False, 1)
        box_selected.pack_start(box1, True, True, 0)
        #box_selected.show()
        box1.show()
        label1.show()

    def setup_recent_items(self):

        # TODO: Move this to constructor
        icons = {
            "gerber": "share/flatcam_icon16.png",
            "excellon": "share/drill16.png",
            "cncjob": "share/cnc16.png",
            "project": "share/project16.png"
        }

        openers = {
            'gerber': self.open_gerber,
            'excellon': self.open_excellon,
            'cncjob': self.open_gcode,
            'project': self.open_project
        }

        # Closure needed to create callbacks in a loop.
        # Otherwise late binding occurs.
        def make_callback(func, fname):
            def opener(*args):
                self.worker.add_task(func, [fname])
            return opener

        try:
            f = open('recent.json')
        except:
            print "ERROR: Failed to load recent item list."
            self.info("Failed to load recent item list.")
            return

        try:
            self.recent = json.load(f)
        except:
            print "ERROR: Failed to parse recent item list."
            self.info("Failed to parse recent item list.")
            f.close()
            return
        f.close()

        recent_menu = Gtk.Menu()
        for recent in self.recent:
            filename = recent['filename'].split('/')[-1].split('\\')[-1]
            item = Gtk.ImageMenuItem.new_with_label(filename)
            im = Gtk.Image.new_from_file(icons[recent["kind"]])
            item.set_image(im)

            o = make_callback(openers[recent["kind"]], recent['filename'])

            item.connect('activate', o)
            recent_menu.append(item)

        self.builder.get_object('open_recent').set_submenu(recent_menu)
        recent_menu.show_all()

    def info(self, text):
        """
        Show text on the status bar. This method is thread safe.

        :param text: Text to display.
        :type text: str
        :return: None
        """
        GLib.idle_add(lambda: self.info_label.set_text(text))

    def get_radio_value(self, radio_set):
        """
        Returns the radio_set[key] of the radiobutton
        whose name is key is active.

        :param radio_set: A dictionary containing widget_name: value pairs.
        :type radio_set: dict
        :return: radio_set[key]
        """

        for name in radio_set:
            if self.builder.get_object(name).get_active():
                return radio_set[name]

    def plot_all(self):
        """
        Re-generates all plots from all objects.

        :return: None
        """
        self.plotcanvas.clear()
        self.set_progress_bar(0.1, "Re-plotting...")

        def worker_task(app_obj):
            percentage = 0.1
            try:
                delta = 0.9 / len(self.collection.get_list())
            except ZeroDivisionError:
                GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))
                return
            for obj in self.collection.get_list():
                obj.plot()
                percentage += delta
                GLib.idle_add(lambda: app_obj.set_progress_bar(percentage, "Re-plotting..."))

            GLib.idle_add(app_obj.plotcanvas.auto_adjust_axes)
            GLib.idle_add(lambda: self.on_zoom_fit(None))
            GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, "Idle"))

        # Send to worker
        self.worker.add_task(worker_task, [self])

    def get_eval(self, widget_name):
        """
        Runs eval() on the on the text entry of name 'widget_name'
        and returns the results.

        :param widget_name: Name of Gtk.Entry
        :type widget_name: str
        :return: Depends on contents of the entry text.
        """

        value = self.builder.get_object(widget_name).get_text()
        if value == "":
            value = "None"
        try:
            evald = eval(value)
            return evald
        except:
            self.info("Could not evaluate: " + value)
            return None

    def new_object(self, kind, name, initialize):
        """
        Creates a new specalized FlatCAMObj and attaches it to the application,
        this is, updates the GUI accordingly, any other records and plots it.
        This method is thread-safe.

        :param kind: The kind of object to create. One of 'gerber',
         'excellon', 'cncjob' and 'geometry'.
        :type kind: str
        :param name: Name for the object.
        :type name: str
        :param initialize: Function to run after creation of the object
         but before it is attached to the application. The function is
         called with 2 parameters: the new object and the App instance.
        :type initialize: function
        :return: None
        :rtype: None
        """

        print "new_object()"

        ### Check for existing name
        if name in self.collection.get_names():
            ## Create a new name
            # Ends with number?
            match = re.search(r'(.*[^\d])?(\d+)$', name)
            if match:  # Yes: Increment the number!
                base = match.group(1) or ''
                num = int(match.group(2))
                name = base + str(num + 1)
            else:  # No: add a number!
                name += "_1"

        # Create object
        classdict = {
            "gerber": FlatCAMGerber,
            "excellon": FlatCAMExcellon,
            "cncjob": FlatCAMCNCjob,
            "geometry": FlatCAMGeometry
        }
        obj = classdict[kind](name)
        obj.units = self.options["units"]  # TODO: The constructor should look at defaults.

        # Set default options from self.options
        for option in self.options:
            if option.find(kind + "_") == 0:
                oname = option[len(kind)+1:]
                obj.options[oname] = self.options[option]

        # Initialize as per user request
        # User must take care to implement initialize
        # in a thread-safe way as is is likely that we
        # have been invoked in a separate thread.
        initialize(obj, self)

        # Check units and convert if necessary
        if self.options["units"].upper() != obj.units.upper():
            GLib.idle_add(lambda: self.info("Converting units to " + self.options["units"] + "."))
            obj.convert_units(self.options["units"])

        # Add to our records
        self.collection.append(obj, active=True)

        # Show object details now.
        GLib.idle_add(lambda: self.notebook.set_current_page(1))

        # Plot
        # TODO: (Thread-safe?)
        obj.plot()

        GLib.idle_add(lambda: self.on_zoom_fit(None))
        #self.on_zoom_fit(None)

        return obj

    def set_progress_bar(self, percentage, text=""):
        """
        Sets the application's progress bar to a given frac_digits and text.

        :param percentage: The frac_digits (0.0-1.0) of the progress.
        :type percentage: float
        :param text: Text to display on the progress bar.
        :type text: str
        :return: None
        """
        self.progress_bar.set_text(text)
        self.progress_bar.set_fraction(percentage)
        return False

    def load_defaults(self):
        """
        Loads the aplication's default settings from defaults.json into
        ``self.defaults``.

        :return: None
        """
        try:
            f = open("defaults.json")
            options = f.read()
            f.close()
        except:
            self.info("ERROR: Could not load defaults file.")
            return

        try:
            defaults = json.loads(options)
        except:
            e = sys.exc_info()[0]
            print e
            self.info("ERROR: Failed to parse defaults file.")
            return
        self.defaults.update(defaults)

    def read_form(self):
        """
        Reads the options form into self.defaults/self.options.

        :return: None
        :rtype: None
        """
        combo_sel = self.combo_options.get_active()
        options_set = [self.options, self.defaults][combo_sel]
        for option in options_set:
            self.read_form_item(option, options_set)

    def read_form_item(self, name, dest):
        """
        Reads the value of a form item in the defaults/options form and
        saves it to the corresponding dictionary.

        :param name: Name of the form item. A key in ``self.defaults`` or
            ``self.options``.
        :type name: str
        :param dest: Dictionary to which to save the value.
        :type dest: dict
        :return: None
        """
        fkind = self.form_kinds[name]
        fname = fkind + "_" + "app" + "_" + name

        if fkind == 'entry_text':
            dest[name] = self.builder.get_object(fname).get_text()
            return
        if fkind == 'entry_eval':
            dest[name] = self.get_eval(fname)
            return
        if fkind == 'cb':
            dest[name] = self.builder.get_object(fname).get_active()
            return
        if fkind == 'radio':
            dest[name] = self.get_radio_value(self.radios[name])
            return
        print "Unknown kind of form item:", fkind

    def options2form(self):
        """
        Sets the 'Project Options' or 'Application Defaults' form with values from
        ``self.options`` or ``self.defaults``.

        :return: None
        :rtype: None
        """

        # Set the on-change callback to do nothing while we do the changes.
        self.options_update_ignore = True
        self.toggle_units_ignore = True

        combo_sel = self.combo_options.get_active()
        options_set = [self.options, self.defaults][combo_sel]
        for option in options_set:
            self.set_form_item(option, options_set[option])

        self.options_update_ignore = False
        self.toggle_units_ignore = False

    def set_form_item(self, name, value):
        """
        Sets a form item 'name' in the GUI with the given 'value'. The syntax of
        form names in the GUI is <kind>_app_<name>, where kind is one of: rb (radio button),
        cb (check button), entry_eval or entry_text (entry), combo (combo box). name is
        whatever name it's been given. For self.defaults, name is a key in the dictionary.

        :param name: Name of the form field.
        :type name: str
        :param value: The value to set the form field to.
        :type value: Depends on field kind.
        :return: None
        """
        if name not in self.form_kinds:
            print "WARNING: Tried to set unknown option/form item:", name
            return
        fkind = self.form_kinds[name]
        fname = fkind + "_" + "app" + "_" + name
        if fkind == 'entry_eval' or fkind == 'entry_text':
            try:
                self.builder.get_object(fname).set_text(str(value))
            except:
                print "ERROR: Failed to set value of %s to %s" % (fname, str(value))
            return
        if fkind == 'cb':
            try:
                self.builder.get_object(fname).set_active(value)
            except:
                print "ERROR: Failed to set value of %s to %s" % (fname, str(value))
            return
        if fkind == 'radio':
            try:
                self.builder.get_object(self.radios_inv[name][value]).set_active(True)
            except:
                print "ERROR: Failed to set value of %s to %s" % (fname, str(value))
            return
        print "Unknown kind of form item:", fkind

    def save_project(self, filename):
        """
        Saves the current project to the specified file.

        :param filename: Name of the file in which to save.
        :type filename: str
        :return: None
        """

        # Capture the latest changes
        try:
            self.collection.get_active().read_form()
        except:
            pass

        # Serialize the whole project
        d = {"objs": [obj.to_dict() for obj in self.collection.get_list()],
             "options": self.options}

        try:
            f = open(filename, 'w')
        except:
            print "ERROR: Failed to open file for saving:", filename
            return

        try:
            json.dump(d, f, default=to_dict)
        except:
            print "ERROR: File open but failed to write:", filename
            f.close()
            return

        f.close()

    def open_project(self, filename):
        """
        Loads a project from the specified file.

        :param filename:  Name of the file from which to load.
        :type filename: str
        :return: None
        """

        try:
            f = open(filename, 'r')
        except:
            self.info("ERROR: Failed to open project file: %s" % filename)
            return

        try:
            d = json.load(f, object_hook=dict2obj)
        except:
            self.info("ERROR: Failed to parse project file: %s" % filename)
            f.close()
            return

        self.register_recent("project", filename)

        # Clear the current project
        self.on_file_new(None)

        # Project options
        self.options.update(d['options'])
        self.project_filename = filename
        GLib.idle_add(lambda: self.units_label.set_text(self.options["units"]))

        # Re create objects
        for obj in d['objs']:
            def obj_init(obj_inst, app_inst):
                obj_inst.from_dict(obj)
            self.new_object(obj['kind'], obj['options']['name'], obj_init)

        self.info("Project loaded from: " + filename)

    def populate_objects_combo(self, combo):
        """
        Populates a Gtk.Comboboxtext with the list of the object in the project.

        :param combo: Name or instance of the comboboxtext.
        :type combo: str or Gtk.ComboBoxText
        :return: None
        """
        print "Populating combo!"
        if type(combo) == str:
            combo = self.builder.get_object(combo)

        combo.remove_all()
        for name in self.collection.get_names():
            combo.append_text(name)

    def versionCheck(self, *args):
        """
        Checks for the latest version of the program. Alerts the
        user if theirs is outdated. This method is meant to be run
        in a saeparate thread.

        :return: None
        """

        try:
            f = urllib.urlopen(App.version_url)
        except:
            GLib.idle_add(lambda: self.info("ERROR trying to check for latest version."))
            return

        try:
            data = json.load(f)
        except:
            GLib.idle_add(lambda: self.info("ERROR trying to check for latest version."))
            f.close()
            return

        f.close()

        if self.version >= data["version"]:
            GLib.idle_add(lambda: self.info("FlatCAM is up to date!"))
            return

        label = Gtk.Label("There is a newer version of FlatCAM\n" +
                          "available for download:\n\n" +
                          data["name"] + "\n\n" + data["message"])
        dialog = Gtk.Dialog("Newer Version Available", self.window, 0,
                            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                             Gtk.STOCK_OK, Gtk.ResponseType.OK))
        dialog.set_default_size(150, 100)
        dialog.set_modal(True)
        box = dialog.get_content_area()
        box.set_border_width(10)
        box.add(label)

        def do_dialog():
            dialog.show_all()
            response = dialog.run()
            dialog.destroy()

        GLib.idle_add(lambda: do_dialog())

        return

    def setup_tooltips(self):
        tooltips = {
            "cb_gerber_plot": "Plot this object on the main window.",
            "cb_gerber_mergepolys": "Show overlapping polygons as single.",
            "cb_gerber_solid": "Paint inside polygons.",
            "cb_gerber_multicolored": "Draw polygons with different colors."
        }

        for widget in tooltips:
            self.builder.get_object(widget).set_tooltip_markup(tooltips[widget])

    def do_nothing(self, param):
        return

    def disable_plots(self, except_current=False):
        """
        Disables all plots with exception of the current object if specified.

        :param except_current: Wether to skip the current object.
        :rtype except_current: boolean
        :return: None
        """
        # TODO: This method is very similar to replot_all. Try to merge.

        self.set_progress_bar(0.1, "Re-plotting...")

        def worker_task(app_obj):
            percentage = 0.1
            try:
                delta = 0.9 / len(self.collection.get_list())
            except ZeroDivisionError:
                GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))
                return
            for obj in self.collection.get_list():
                #if i != app_obj.selected_item_name or not except_current:
                if obj != self.collection.get_active() or not except_current:
                    obj.options['plot'] = False
                    obj.plot()
                percentage += delta
                GLib.idle_add(lambda: app_obj.set_progress_bar(percentage, "Re-plotting..."))

            GLib.idle_add(app_obj.plotcanvas.auto_adjust_axes)
            GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))

        # Send to worker
        self.worker.add_task(worker_task, [self])

    def enable_all_plots(self, *args):
        self.plotcanvas.clear()
        self.set_progress_bar(0.1, "Re-plotting...")

        def worker_task(app_obj):
            percentage = 0.1
            try:
                delta = 0.9 / len(self.collection.get_list())
            except ZeroDivisionError:
                GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))
                return
            for obj in self.collection.get_list():
                obj.options['plot'] = True
                obj.plot()
                percentage += delta
                GLib.idle_add(lambda: app_obj.set_progress_bar(percentage, "Re-plotting..."))

            GLib.idle_add(app_obj.plotcanvas.auto_adjust_axes)
            GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))

        # Send to worker
        self.worker.add_task(worker_task, [self])

    def register_recent(self, kind, filename):
        record = {'kind': kind, 'filename': filename}

        if record in self.recent:
            return

        self.recent.insert(0, record)

        if len(self.recent) > 10:  # Limit reached
            self.recent.pop()

        try:
            f = open('recent.json', 'w')
        except:
            print "ERROR: Failed to open recent items file for writing."
            self.info('Failed to open recent files file for writing.')
            return

        try:
            json.dump(self.recent, f)
        except:
            print "ERROR: Failed to write to recent items file."
            self.info('Failed to write to recent items file.')
            f.close()

        f.close()

    def open_gerber(self, filename):
        """
        Opens a Gerber file, parses it and creates a new object for
        it in the program. Thread-safe.

        :param filename: Gerber file filename
        :type filename: str
        :return: None
        """
        GLib.idle_add(lambda: self.set_progress_bar(0.1, "Opening Gerber ..."))

        # How the object should be initialized
        def obj_init(gerber_obj, app_obj):
            assert isinstance(gerber_obj, FlatCAMGerber)

            # Opening the file happens here
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Parsing ..."))
            gerber_obj.parse_file(filename)

            # Further parsing
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.5, "Creating Geometry ..."))
            #gerber_obj.create_geometry()
            gerber_obj.solid_geometry = gerber_obj.otf_geometry
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Plotting ..."))

        # Object name
        name = filename.split('/')[-1].split('\\')[-1]

        # New object creation and file processing
        try:
            self.new_object("gerber", name, obj_init)
        except:
            e = sys.exc_info()
            print "ERROR:", e[0]
            traceback.print_exc()
            self.message_dialog("Failed to create Gerber Object",
                                "Attempting to create a FlatCAM Gerber Object from " +
                                "Gerber file failed during processing:\n" +
                                str(e[0]) + " " + str(e[1]), kind="error")
            GLib.timeout_add_seconds(1, lambda: self.set_progress_bar(0.0, "Idle"))
            self.collection.delete_active()
            return

        # Register recent file
        self.register_recent("gerber", filename)

        # GUI feedback
        self.info("Opened: " + filename)
        GLib.idle_add(lambda: self.set_progress_bar(1.0, "Done!"))
        GLib.timeout_add_seconds(1, lambda: self.set_progress_bar(0.0, "Idle"))

    def open_excellon(self, filename):
        """
        Opens an Excellon file, parses it and creates a new object for
        it in the program. Thread-safe.

        :param filename: Excellon file filename
        :type filename: str
        :return: None
        """
        GLib.idle_add(lambda: self.set_progress_bar(0.1, "Opening Excellon ..."))

        # How the object should be initialized
        def obj_init(excellon_obj, app_obj):
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Parsing ..."))
            excellon_obj.parse_file(filename)
            excellon_obj.create_geometry()
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Plotting ..."))

        # Object name
        name = filename.split('/')[-1].split('\\')[-1]

        # New object creation and file processing
        try:
            self.new_object("excellon", name, obj_init)
        except:
            e = sys.exc_info()
            print "ERROR:", e[0]
            self.message_dialog("Failed to create Excellon Object",
                                "Attempting to create a FlatCAM Excellon Object from " +
                                "Excellon file failed during processing:\n" +
                                str(e[0]) + " " + str(e[1]), kind="error")
            GLib.timeout_add_seconds(1, lambda: self.set_progress_bar(0.0, "Idle"))
            self.collection.delete_active()
            return

        # Register recent file
        self.register_recent("excellon", filename)

        # GUI feedback
        self.info("Opened: " + filename)
        GLib.idle_add(lambda: self.set_progress_bar(1.0, "Done!"))
        GLib.timeout_add_seconds(1, lambda: self.set_progress_bar(0.0, ""))

    def open_gcode(self, filename):
        """
        Opens a G-gcode file, parses it and creates a new object for
        it in the program. Thread-safe.

        :param filename: G-code file filename
        :type filename: str
        :return: None
        """

        # How the object should be initialized
        def obj_init(job_obj, app_obj_):
            """

            :type app_obj_: App
            """
            assert isinstance(app_obj_, App)
            GLib.idle_add(lambda: app_obj_.set_progress_bar(0.1, "Opening G-Code ..."))

            f = open(filename)
            gcode = f.read()
            f.close()

            job_obj.gcode = gcode

            GLib.idle_add(lambda: app_obj_.set_progress_bar(0.2, "Parsing ..."))
            job_obj.gcode_parse()

            GLib.idle_add(lambda: app_obj_.set_progress_bar(0.6, "Creating geometry ..."))
            job_obj.create_geometry()

            GLib.idle_add(lambda: app_obj_.set_progress_bar(0.6, "Plotting ..."))

        # Object name
        name = filename.split('/')[-1].split('\\')[-1]

        # New object creation and file processing
        try:
            self.new_object("cncjob", name, obj_init)
        except:
            e = sys.exc_info()
            print "ERROR:", e[0]
            self.message_dialog("Failed to create CNCJob Object",
                                "Attempting to create a FlatCAM CNCJob Object from " +
                                "G-Code file failed during processing:\n" +
                                str(e[0]) + " " + str(e[1]), kind="error")
            GLib.timeout_add_seconds(1, lambda: self.set_progress_bar(0.0, "Idle"))
            self.collection.delete_active()
            return

        # Register recent file
        self.register_recent("cncjob", filename)

        # GUI feedback
        self.info("Opened: " + filename)
        GLib.idle_add(lambda: self.set_progress_bar(1.0, "Done!"))
        GLib.timeout_add_seconds(1, lambda: self.set_progress_bar(0.0, ""))

    ########################################
    ##         EVENT HANDLERS             ##
    ########################################
    def on_debug_printlist(self, *args):
        self.collection.print_list()

    def on_disable_all_plots(self, widget):
        self.disable_plots()

    def on_disable_all_plots_not_current(self, widget):
        self.disable_plots(except_current=True)

    def on_offset_object(self, widget):
        """
        Offsets the object's geometry by the vector specified
        in the form. Re-plots.

        :param widget: Ignored
        :return: None
        """

        obj = self.collection.get_active()
        obj.read_form()
        assert isinstance(obj, FlatCAMObj)
        try:
            vect = self.get_eval("entry_eval_" + obj.kind + "_offset")
        except:
            self.info("ERROR: Vector is not in (x, y) format.")
            return
        assert isinstance(obj, Geometry)
        obj.offset(vect)
        obj.plot()
        return

    def on_cb_plot_toggled(self, widget):
        """
        Callback for toggling the "Plot" checkbox. Re-plots.

        :param widget: Ignored.
        :return: None
        """

        self.collection.get_active().read_form()
        self.collection.get_active().plot()

    def on_about(self, widget):
        """
        Opens the 'About' dialog box.

        :param widget: Ignored.
        :return: None
        """

        about = self.builder.get_object("aboutdialog")
        response = about.run()
        about.hide()

    def on_create_mirror(self, widget):
        """
        Creates a mirror image of an object to be used as a bottom layer.

        :param widget: Ignored.
        :return: None
        """
        # TODO: Move (some of) this to camlib!

        # Object to mirror
        obj_name = self.builder.get_object("comboboxtext_bottomlayer").get_active_text()
        fcobj = self.collection.get_by_name(obj_name)

        # For now, lets limit to Gerbers and Excellons.
        # assert isinstance(gerb, FlatCAMGerber)
        if not isinstance(fcobj, FlatCAMGerber) and not isinstance(fcobj, FlatCAMExcellon):
            self.info("ERROR: Only Gerber and Excellon objects can be mirrored.")
            return

        # Mirror axis "X" or "Y
        axis = self.get_radio_value({"rb_mirror_x": "X",
                                     "rb_mirror_y": "Y"})
        mode = self.get_radio_value({"rb_mirror_box": "box",
                                     "rb_mirror_point": "point"})
        if mode == "point":  # A single point defines the mirror axis
            # TODO: Error handling
            px, py = eval(self.point_entry.get_text())
        else:  # The axis is the line dividing the box in the middle
            name = self.box_combo.get_active_text()
            bb_obj = self.collection.get_by_name(name)
            xmin, ymin, xmax, ymax = bb_obj.bounds()
            px = 0.5*(xmin+xmax)
            py = 0.5*(ymin+ymax)

        fcobj.mirror(axis, [px, py])
        fcobj.plot()

    def on_create_aligndrill(self, widget):
        """
        Creates alignment holes Excellon object. Creates mirror duplicates
        of the specified holes around the specified axis.

        :param widget: Ignored.
        :return: None
        """

        # Mirror axis. Same as in on_create_mirror.
        axis = self.get_radio_value({"rb_mirror_x": "X",
                                     "rb_mirror_y": "Y"})
        # TODO: Error handling
        mode = self.get_radio_value({"rb_mirror_box": "box",
                                     "rb_mirror_point": "point"})
        if mode == "point":
            px, py = eval(self.point_entry.get_text())
        else:
            name = self.box_combo.get_active_text()
            bb_obj = self.collection.get_by_name(name)
            xmin, ymin, xmax, ymax = bb_obj.bounds()
            px = 0.5*(xmin+xmax)
            py = 0.5*(ymin+ymax)
        xscale, yscale = {"X": (1.0, -1.0), "Y": (-1.0, 1.0)}[axis]

        # Tools
        dia = self.get_eval("entry_dblsided_alignholediam")
        tools = {"1": {"C": dia}}

        # Parse hole list
        # TODO: Better parsing
        holes = self.builder.get_object("entry_dblsided_alignholes").get_text()
        holes = eval("[" + holes + "]")
        drills = []
        for hole in holes:
            point = Point(hole)
            point_mirror = affinity.scale(point, xscale, yscale, origin=(px, py))
            drills.append({"point": point, "tool": "1"})
            drills.append({"point": point_mirror, "tool": "1"})

        def obj_init(obj_inst, app_inst):
            obj_inst.tools = tools
            obj_inst.drills = drills
            obj_inst.create_geometry()

        self.new_object("excellon", "Alignment Drills", obj_init)

    def on_toggle_pointbox(self, widget):
        """
        Callback for radio selection change between point and box in the
        Double-sided PCB tool. Updates the UI accordingly.

        :param widget: Ignored.
        :return: None
        """

        # Where the entry or combo go
        box = self.builder.get_object("box_pointbox")

        # Clear contents
        children = box.get_children()
        for child in children:
            box.remove(child)

        choice = self.get_radio_value({"rb_mirror_point": "point",
                                       "rb_mirror_box": "box"})

        if choice == "point":
            self.point_entry = Gtk.Entry()
            self.builder.get_object("box_pointbox").pack_start(self.point_entry,
                                                               False, False, 1)
            self.point_entry.show()
        else:
            self.box_combo = Gtk.ComboBoxText()
            self.builder.get_object("box_pointbox").pack_start(self.box_combo,
                                                               False, False, 1)
            self.populate_objects_combo(self.box_combo)
            self.box_combo.show()


    def on_tools_doublesided(self, param):
        """
        Callback for menu item Tools->Double Sided PCB Tool. Launches the
        tool placing its UI in the "Tool" tab in the notebook.

        :param param: Ignored.
        :return: None
        """

        # Were are we drawing the UI
        box_tool = self.builder.get_object("box_tool")

        # Remove anything else in the box
        box_children = box_tool.get_children()
        for child in box_children:
            box_tool.remove(child)

        # Get the UI
        osw = self.builder.get_object("offscreenwindow_dblsided")
        sw = self.builder.get_object("sw_dblsided")
        osw.remove(sw)
        vp = self.builder.get_object("vp_dblsided")
        vp.override_background_color(Gtk.StateType.NORMAL, Gdk.RGBA(1, 1, 1, 1))

        # Put in the UI
        box_tool.pack_start(sw, True, True, 0)

        # INITIALIZATION
        # Populate combo box
        self.populate_objects_combo("comboboxtext_bottomlayer")

        # Point entry
        self.point_entry = Gtk.Entry()
        box = self.builder.get_object("box_pointbox")
        for child in box.get_children():
            box.remove(child)
        box.pack_start(self.point_entry, False, False, 1)

        # Show the "Tool" tab
        self.notebook.set_current_page(3)
        sw.show_all()

    def on_toggle_units(self, widget):
        """
        Callback for the Units radio-button change in the Options tab.
        Changes the application's default units or the current project's units.
        If changing the project's units, the change propagates to all of
        the objects in the project.

        :param widget: Ignored.
        :return: None
        """

        if self.toggle_units_ignore:
            return

        combo_sel = self.combo_options.get_active()
        options_set = [self.options, self.defaults][combo_sel]

        # Options to scale
        dimensions = ['gerber_isotooldia', 'gerber_cutoutmargin', 'gerber_cutoutgapsize',
                      'gerber_noncoppermargin', 'gerber_bboxmargin', 'excellon_drillz',
                      'excellon_travelz', 'excellon_feedrate', 'cncjob_tooldia',
                      'geometry_cutz', 'geometry_travelz', 'geometry_feedrate',
                      'geometry_cnctooldia', 'geometry_painttooldia', 'geometry_paintoverlap',
                      'geometry_paintmargin']

        def scale_options(factor):
            for dim in dimensions:
                options_set[dim] *= factor

        # The scaling factor depending on choice of units.
        factor = 1/25.4
        if self.builder.get_object('rb_mm').get_active():
            factor = 25.4

        # App units. Convert without warning.
        if combo_sel == 1:
            self.read_form()
            scale_options(factor)
            self.options2form()
            return

        # Changing project units. Warn user.
        label = Gtk.Label("Changing the units of the project causes all geometrical \n" + \
                            "properties of all objects to be scaled accordingly. Continue?")
        dialog = Gtk.Dialog("Changing Project Units", self.window, 0,
                            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                             Gtk.STOCK_OK, Gtk.ResponseType.OK))
        dialog.set_default_size(150, 100)
        dialog.set_modal(True)
        box = dialog.get_content_area()
        box.set_border_width(10)
        box.add(label)
        dialog.show_all()
        response = dialog.run()
        dialog.destroy()

        if response == Gtk.ResponseType.OK:
            #print "Converting units..."
            #print "Converting options..."
            self.read_form()
            scale_options(factor)
            self.options2form()
            for obj in self.collection.get_list():
                units = self.get_radio_value({"rb_mm": "MM", "rb_inch": "IN"})
                obj.convert_units(units)
            current = self.collection.get_active()
            if current is not None:
                current.to_form()
            self.plot_all()
        else:
            # Undo toggling
            self.toggle_units_ignore = True
            if self.builder.get_object('rb_mm').get_active():
                self.builder.get_object('rb_inch').set_active(True)
            else:
                self.builder.get_object('rb_mm').set_active(True)
            self.toggle_units_ignore = False

        self.read_form()
        self.info("Converted units to %s" % self.options["units"])
        self.units_label.set_text("[" + self.options["units"] + "]")

    def on_file_openproject(self, param):
        """
        Callback for menu item File->Open Project. Opens a file chooser and calls
        ``self.open_project()`` after successful selection of a filename.

        :param param: Ignored.
        :return: None
        """

        def on_success(app_obj, filename):
            app_obj.open_project(filename)

        self.file_chooser_action(on_success)

    def on_file_saveproject(self, param):
        """
        Callback for menu item File->Save Project. Saves the project to
        ``self.project_filename`` or calls ``self.on_file_saveprojectas()``
        if set to None. The project is saved by calling ``self.save_project()``.

        :param param: Ignored.
        :return: None
        """

        if self.project_filename is None:
            self.on_file_saveprojectas(None)
        else:
            self.save_project(self.project_filename)
            self.register_recent("project", self.project_filename)
            self.info("Project saved to: " + self.project_filename)

    def on_file_saveprojectas(self, param):
        """
        Callback for menu item File->Save Project As... Opens a file
        chooser and saves the project to the given file via
        ``self.save_project()``.

        :param param: Ignored.
        :return: None
        """

        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)

            try:
                f = open(filename, 'r')
                f.close()
                exists = True
            except IOError:
                exists = False

            msg = "File exists. Overwrite?"
            if exists and self.question_dialog("File exists", msg) == Gtk.ResponseType.CANCEL:
                return

            app_obj.save_project(filename)
            self.project_filename = filename
            self.register_recent("project", filename)
            app_obj.info("Project saved to: " + filename)

        self.file_chooser_save_action(on_success)

    def on_file_saveprojectcopy(self, param):
        """
        Callback for menu item File->Save Project Copy... Opens a file
        chooser and saves the project to the given file via
        ``self.save_project``. It does not update ``self.project_filename`` so
        subsequent save requests are done on the previous known filename.

        :param param: Ignore.
        :return: None
        """

        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)

            try:
                f = open(filename, 'r')
                f.close()
                exists = True
            except IOError:
                exists = False

            msg = "File exists. Overwrite?"
            if exists and self.question_dialog("File exists", msg) == Gtk.ResponseType.CANCEL:
                return

            app_obj.save_project(filename)
            self.register_recent("project", filename)
            app_obj.info("Project copy saved to: " + filename)

        self.file_chooser_save_action(on_success)

    def on_options_app2project(self, param):
        """
        Callback for Options->Transfer Options->App=>Project. Copies options
        from application defaults to project defaults.

        :param param: Ignored.
        :return: None
        """

        self.options.update(self.defaults)
        self.options2form()  # Update UI

    def on_options_project2app(self, param):
        """
        Callback for Options->Transfer Options->Project=>App. Copies options
        from project defaults to application defaults.

        :param param: Ignored.
        :return: None
        """

        self.defaults.update(self.options)
        self.options2form()  # Update UI

    def on_options_project2object(self, param):
        """
        Callback for Options->Transfer Options->Project=>Object. Copies options
        from project defaults to the currently selected object.

        :param param: Ignored.
        :return: None
        """

        obj = self.collection.get_active()
        if obj is None:
            self.info("WARNING: No object selected.")
            return
        for option in self.options:
            if option.find(obj.kind + "_") == 0:
                oname = option[len(obj.kind)+1:]
                obj.options[oname] = self.options[option]
        obj.to_form()  # Update UI

    def on_options_object2project(self, param):
        """
        Callback for Options->Transfer Options->Object=>Project. Copies options
        from the currently selected object to project defaults.

        :param param: Ignored.
        :return: None
        """

        obj = self.collection.get_active()
        if obj is None:
            self.info("WARNING: No object selected.")
            return
        obj.read_form()
        for option in obj.options:
            if option in ['name']:  # TODO: Handle this better...
                continue
            self.options[obj.kind + "_" + option] = obj.options[option]
        self.options2form()  # Update UI

    def on_options_object2app(self, param):
        """
        Callback for Options->Transfer Options->Object=>App. Copies options
        from the currently selected object to application defaults.

        :param param: Ignored.
        :return: None
        """
        obj = self.collection.get_active()
        if obj is None:
            self.info("WARNING: No object selected.")
            return
        obj.read_form()
        for option in obj.options:
            if option in ['name']:  # TODO: Handle this better...
                continue
            self.defaults[obj.kind + "_" + option] = obj.options[option]
        self.options2form()  # Update UI

    def on_options_app2object(self, param):
        """
        Callback for Options->Transfer Options->App=>Object. Copies options
        from application defaults to the currently selected object.

        :param param: Ignored.
        :return: None
        """

        obj = self.collection.get_active()
        if obj is None:
            self.info("WARNING: No object selected.")
            return
        for option in self.defaults:
            if option.find(obj.kind + "_") == 0:
                oname = option[len(obj.kind)+1:]
                obj.options[oname] = self.defaults[option]
        obj.to_form()  # Update UI

    def on_file_savedefaults(self, param):
        """
        Callback for menu item File->Save Defaults. Saves application default options
        ``self.defaults`` to defaults.json.

        :param param: Ignored.
        :return: None
        """

        # Read options from file
        try:
            f = open("defaults.json")
            options = f.read()
            f.close()
        except:
            self.info("ERROR: Could not load defaults file.")
            return

        try:
            defaults = json.loads(options)
        except:
            e = sys.exc_info()[0]
            print e
            self.info("ERROR: Failed to parse defaults file.")
            return

        # Update options
        assert isinstance(defaults, dict)
        defaults.update(self.defaults)

        # Save update options
        try:
            f = open("defaults.json", "w")
            json.dump(defaults, f)
            f.close()
        except:
            self.info("ERROR: Failed to write defaults to file.")
            return

        self.info("Defaults saved.")

    def on_options_combo_change(self, widget):
        """
        Called when the combo box to choose between application defaults and
        project option changes value. The corresponding variables are
        copied to the UI.

        :param widget: The widget from which this was called. Ignore.
        :return: None
        """

        #combo_sel = self.combo_options.get_active()
        #print "Options --> ", combo_sel
        self.options2form()

    def on_options_update(self, widget):
        """
        Called whenever a value in the options/defaults form changes.
        All values are updated. Can be inhibited by setting ``self.options_update_ignore = True``,
        which may be necessary when updating the UI from code and not by the user.

        :param widget: The widget from which this was called. Ignore.
        :return: None
        """

        if self.options_update_ignore:
            return
        self.read_form()

    def on_scale_object(self, widget):
        """
        Callback for request to change an objects geometry scale. The object
        is re-scaled and replotted.

        :param widget: Ignored.
        :return: None
        """

        obj = self.collection.get_active()
        factor = self.get_eval("entry_eval_" + obj.kind + "_scalefactor")
        obj.scale(factor)
        obj.to_form()
        self.on_update_plot(None)

    def on_canvas_configure(self, widget, event):
        """
        Called whenever the canvas changes size. The axes are updated such
        as to use the whole canvas.

        :param widget: Ignored.
        :param event: Ignored.
        :return: None
        """

        self.plotcanvas.auto_adjust_axes()

    def on_row_activated(self, widget, path, col):
        """
        Callback for selection activation (Enter or double-click) on the Project list.
        Switches the notebook page to the object properties form. Calls
        ``self.notebook.set_current_page(1)``.

        :param widget: Ignored.
        :param path: Ignored.
        :param col: Ignored.
        :return: None
        """
        self.notebook.set_current_page(1)

    def on_generate_gerber_bounding_box(self, widget):
        """
        Callback for request from the Gerber form to generate a bounding box for the
        geometry in the object. Creates a FlatCAMGeometry with the bounding box.
        The box can have rounded corners if specified in the form.

        :param widget: Ignored.
        :return: None
        """
        # TODO: Use Gerber.get_bounding_box(...)
        gerber = self.collection.get_active()
        gerber.read_form()
        name = gerber.options["name"] + "_bbox"

        def geo_init(geo_obj, app_obj):
            assert isinstance(geo_obj, FlatCAMGeometry)
            # Bounding box with rounded corners
            bounding_box = gerber.solid_geometry.envelope.buffer(gerber.options["bboxmargin"])
            if not gerber.options["bboxrounded"]:  # Remove rounded corners
                bounding_box = bounding_box.envelope
            geo_obj.solid_geometry = bounding_box

        self.new_object("geometry", name, geo_init)

    def on_update_plot(self, widget):
        """
        Callback for button on form for all kinds of objects.
        Re-plots the current object only.

        :param widget: The widget from which this was called. Ignored.
        :return: None
        """

        obj = self.collection.get_active()
        obj.read_form()

        self.set_progress_bar(0.5, "Plotting...")

        def thread_func(app_obj):
            assert isinstance(app_obj, App)
            obj.plot()
            GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, "Idle"))

        # Send to worker
        self.worker.add_task(thread_func, [self])

    def on_generate_excellon_cncjob(self, widget):
        """
        Callback for button active/click on Excellon form to
        create a CNC Job for the Excellon file.

        :param widget: Ignored
        :return: None
        """

        excellon = self.collection.get_active()
        excellon.read_form()
        job_name = excellon.options["name"] + "_cnc"

        # Object initialization function for app.new_object()
        def job_init(job_obj, app_obj):
            # excellon_ = self.get_current()
            # assert isinstance(excellon_, FlatCAMExcellon)
            assert isinstance(job_obj, FlatCAMCNCjob)

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Creating CNC Job..."))
            job_obj.z_cut = excellon.options["drillz"]
            job_obj.z_move = excellon.options["travelz"]
            job_obj.feedrate = excellon.options["feedrate"]
            # There could be more than one drill size...
            # job_obj.tooldia =   # TODO: duplicate variable!
            # job_obj.options["tooldia"] =
            job_obj.generate_from_excellon_by_tool(excellon, excellon.options["toolselection"])

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.5, "Parsing G-Code..."))
            job_obj.gcode_parse()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Creating New Geometry..."))
            job_obj.create_geometry()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.8, "Plotting..."))

        # To be run in separate thread
        def job_thread(app_obj):
            app_obj.new_object("cncjob", job_name, job_init)
            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # Send to worker
        self.worker.add_task(job_thread, [self])

    def on_excellon_tool_choose(self, widget):
        """
        Callback for button on Excellon form to open up a window for
        selecting tools.

        :param widget: The widget from which this was called.
        :return: None
        """
        excellon = self.collection.get_active()
        assert isinstance(excellon, FlatCAMExcellon)
        excellon.show_tool_chooser()

    def on_entry_eval_activate(self, widget):
        """
        Called when an entry is activated (eg. by hitting enter) if
        set to do so. Its text is eval()'d and set to the returned value.
        The current object is updated.

        :param widget:
        :return:
        """
        self.on_eval_update(widget)
        obj = self.collection.get_active()
        assert isinstance(obj, FlatCAMObj)
        obj.read_form()

    def on_gerber_generate_noncopper(self, widget):
        """
        Callback for button on Gerber form to create a geometry object
        with polygons covering the area without copper or negative of the
        Gerber.

        :param widget: The widget from which this was called.
        :return: None
        """

        gerb = self.collection.get_active()
        gerb.read_form()
        name = gerb.options["name"] + "_noncopper"

        def geo_init(geo_obj, app_obj):
            assert isinstance(geo_obj, FlatCAMGeometry)
            bounding_box = gerb.solid_geometry.envelope.buffer(gerb.options["noncoppermargin"])
            if not gerb.options["noncopperrounded"]:
                bounding_box = bounding_box.envelope
            non_copper = bounding_box.difference(gerb.solid_geometry)
            geo_obj.solid_geometry = non_copper

        # TODO: Check for None
        self.new_object("geometry", name, geo_init)

    def on_gerber_generate_cutout(self, widget):
        """
        Callback for button on Gerber form to create geometry with lines
        for cutting off the board.

        :param widget: The widget from which this was called.
        :return: None
        """

        gerb = self.collection.get_active()
        gerb.read_form()
        name = gerb.options["name"] + "_cutout"

        def geo_init(geo_obj, app_obj):
            margin = gerb.options["cutoutmargin"] + gerb.options["cutouttooldia"]/2
            gap_size = gerb.options["cutoutgapsize"] + gerb.options["cutouttooldia"]
            minx, miny, maxx, maxy = gerb.bounds()
            minx -= margin
            maxx += margin
            miny -= margin
            maxy += margin
            midx = 0.5 * (minx + maxx)
            midy = 0.5 * (miny + maxy)
            hgap = 0.5 * gap_size
            pts = [[midx - hgap, maxy],
                   [minx, maxy],
                   [minx, midy + hgap],
                   [minx, midy - hgap],
                   [minx, miny],
                   [midx - hgap, miny],
                   [midx + hgap, miny],
                   [maxx, miny],
                   [maxx, midy - hgap],
                   [maxx, midy + hgap],
                   [maxx, maxy],
                   [midx + hgap, maxy]]
            cases = {"tb": [[pts[0], pts[1], pts[4], pts[5]],
                            [pts[6], pts[7], pts[10], pts[11]]],
                     "lr": [[pts[9], pts[10], pts[1], pts[2]],
                            [pts[3], pts[4], pts[7], pts[8]]],
                     "4": [[pts[0], pts[1], pts[2]],
                           [pts[3], pts[4], pts[5]],
                           [pts[6], pts[7], pts[8]],
                           [pts[9], pts[10], pts[11]]]}
            cuts = cases[app.get_radio_value({"rb_2tb": "tb", "rb_2lr": "lr", "rb_4": "4"})]
            geo_obj.solid_geometry = cascaded_union([LineString(segment) for segment in cuts])

        # TODO: Check for None
        self.new_object("geometry", name, geo_init)

    def on_eval_update(self, widget):
        """
        Modifies the content of a Gtk.Entry by running
        eval() on its contents and puting it back as a
        string.

        :param widget: The widget from which this was called.
        :return: None
        """
        # TODO: error handling here
        widget.set_text(str(eval(widget.get_text())))

    def on_generate_isolation(self, widget):
        """
        Callback for button on Gerber form to create isolation routing geometry.

        :param widget: The widget from which this was called.
        :return: None
        """

        gerb = self.collection.get_active()
        gerb.read_form()
        dia = gerb.options["isotooldia"]
        passes = int(gerb.options["isopasses"])
        overlap = gerb.options["isooverlap"] * dia

        for i in range(passes):

            offset = (2*i + 1)/2.0 * dia - i*overlap
            iso_name = gerb.options["name"] + "_iso%d" % (i+1)

            # TODO: This is ugly. Create way to pass data into init function.
            def iso_init(geo_obj, app_obj):
                # Propagate options
                geo_obj.options["cnctooldia"] = gerb.options["isotooldia"]

                geo_obj.solid_geometry = gerb.isolation_geometry(offset)
                app_obj.info("Isolation geometry created: %s" % geo_obj.options["name"])

            # TODO: Do something if this is None. Offer changing name?
            self.new_object("geometry", iso_name, iso_init)

    def on_generate_cncjob(self, widget):
        """
        Callback for button on geometry form to generate CNC job.

        :param widget: The widget from which this was called.
        :return: None
        """

        source_geo = self.collection.get_active()
        source_geo.read_form()
        job_name = source_geo.options["name"] + "_cnc"

        # Object initialization function for app.new_object()
        # RUNNING ON SEPARATE THREAD!
        def job_init(job_obj, app_obj):
            assert isinstance(job_obj, FlatCAMCNCjob)
            # Propagate options
            job_obj.options["tooldia"] = source_geo.options["cnctooldia"]

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Creating CNC Job..."))
            job_obj.z_cut = source_geo.options["cutz"]
            job_obj.z_move = source_geo.options["travelz"]
            job_obj.feedrate = source_geo.options["feedrate"]

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.4, "Analyzing Geometry..."))
            # TODO: The tolerance should not be hard coded. Just for testing.
            job_obj.generate_from_geometry(source_geo, tolerance=0.0005)

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.5, "Parsing G-Code..."))
            job_obj.gcode_parse()

            # TODO: job_obj.create_geometry creates stuff that is not used.
            #GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Creating New Geometry..."))
            #job_obj.create_geometry()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.8, "Plotting..."))

        # To be run in separate thread
        def job_thread(app_obj):
            app_obj.new_object("cncjob", job_name, job_init)
            GLib.idle_add(lambda: app_obj.info("CNCjob created: %s" % job_name))
            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # Send to worker
        self.worker.add_task(job_thread, [self])

    def on_generate_paintarea(self, widget):
        """
        Callback for button on geometry form.
        Subscribes to the "Click on plot" event and continues
        after the click. Finds the polygon containing
        the clicked point and runs clear_poly() on it, resulting
        in a new FlatCAMGeometry object.

        :param widget: The  widget from which this was called.
        :return: None
        """

        self.info("Click inside the desired polygon.")
        geo = self.collection.get_active()
        geo.read_form()
        assert isinstance(geo, FlatCAMGeometry)
        tooldia = geo.options["painttooldia"]
        overlap = geo.options["paintoverlap"]

        # Connection ID for the click event
        subscription = None

        # To be called after clicking on the plot.
        def doit(event):
            #self.plot_click_subscribers.pop("generate_paintarea")
            self.plotcanvas.mpl_disconnect(subscription)
            self.info("Painting")
            point = [event.xdata, event.ydata]
            poly = find_polygon(geo.solid_geometry, point)

            # Initializes the new geometry object
            def gen_paintarea(geo_obj, app_obj):
                assert isinstance(geo_obj, FlatCAMGeometry)
                assert isinstance(app_obj, App)
                cp = clear_poly(poly.buffer(-geo.options["paintmargin"]), tooldia, overlap)
                geo_obj.solid_geometry = cp
                geo_obj.options["cnctooldia"] = tooldia

            #name = self.selected_item_name + "_paint"
            name = geo.options["name"] + "_paint"
            self.new_object("geometry", name, gen_paintarea)

        #self.plot_click_subscribers["generate_paintarea"] = doit
        subscription = self.plotcanvas.mpl_connect('button_press_event', doit)

    def on_cncjob_exportgcode(self, widget):
        """
        Called from button on CNCjob form to save the G-Code from the object.

        :param widget: The widget from which this was called.
        :return: None
        """
        def on_success(app_obj, filename):
            cncjob = app_obj.collection.get_active()
            f = open(filename, 'w')
            f.write(cncjob.gcode)
            f.close()
            app_obj.info("Saved to: " + filename)

        self.file_chooser_save_action(on_success)

    def on_delete(self, widget):
        """
        Delete the currently selected FlatCAMObj.

        :param widget: The widget from which this was called. Ignored.
        :return: None
        """

        # Keep this for later
        name = copy.copy(self.collection.get_active().options["name"])

        # Remove plot
        self.plotcanvas.figure.delaxes(self.collection.get_active().axes)
        self.plotcanvas.auto_adjust_axes()

        # Clear form
        self.setup_component_editor()

        # Remove from dictionary
        self.collection.delete_active()

        self.info("Object deleted: %s" % name)

    def on_toolbar_replot(self, widget):
        """
        Callback for toolbar button. Re-plots all objects.

        :param widget: The widget from which this was called.
        :return: None
        """

        self.collection.get_active().read_form()

        self.plot_all()

    def on_clear_plots(self, widget):
        """
        Callback for toolbar button. Clears all plots.

        :param widget: The widget from which this was called.
        :return: None
        """
        self.plotcanvas.clear()

    def on_activate_name(self, entry):
        """
        Hitting 'Enter' after changing the name of an item
        updates the item dictionary and re-builds the item list.

        :param entry: The widget from which this was called.
        :return: None
        """

        old_name = copy.copy(self.collection.get_active().options["name"])
        new_name = entry.get_text()
        self.collection.change_name(old_name, new_name)
        self.info("Name changed from %s to %s" % (old_name, new_name))

    def on_file_new(self, param):
        """
        Callback for menu item File->New. Returns the application to its
        startup state. This method is thread-safe.

        :param param: Whatever is passed by the event. Ignore.
        :return: None
        """
        # Remove everything from memory

        # GUI things
        def task():
            # Clear plot
            self.plotcanvas.clear()

            # Delete data
            self.collection.delete_all()

            # Clear object editor
            self.setup_component_editor()

        GLib.idle_add(task)

        # Clear project filename
        self.project_filename = None

        # Re-fresh project options
        self.on_options_app2project(None)

    def on_filequit(self, param):
        """
        Callback for menu item File->Quit. Closes the application.

        :param param: Whatever is passed by the event. Ignore.
        :return: None
        """

        self.window.destroy()
        Gtk.main_quit()

    def on_closewindow(self, param):
        """
        Callback for closing the main window.

        :param param: Whatever is passed by the event. Ignore.
        :return: None
        """

        self.window.destroy()
        Gtk.main_quit()

    def file_chooser_action(self, on_success):
        """
        Opens the file chooser and runs on_success on a separate thread
        upon completion of valid file choice.

        :param on_success: A function to run upon completion of a valid file
            selection. Takes 2 parameters: The app instance and the filename.
            Note that it is run on a separate thread, therefore it must take the
            appropriate precautions  when accessing shared resources.
        :type on_success: func
        :return: None
        """
        dialog = Gtk.FileChooserDialog("Please choose a file", self.window,
                                       Gtk.FileChooserAction.OPEN,
                                       (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                                        Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
            dialog.destroy()
            # Send to worker.
            self.worker.add_task(on_success, [self, filename])
        elif response == Gtk.ResponseType.CANCEL:
            self.info("Open cancelled.")
            dialog.destroy()

    def file_chooser_save_action(self, on_success):
        """
        Opens the file chooser and runs on_success upon completion of valid file choice.

        :param on_success: A function to run upon selection of a filename. Takes 2
            parameters: The instance of the application (App) and the chosen filename. This
            gets run immediately in the same thread.
        :return: None
        """
        dialog = Gtk.FileChooserDialog("Save file", self.window,
                                       Gtk.FileChooserAction.SAVE,
                                       (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                                        Gtk.STOCK_SAVE, Gtk.ResponseType.OK))
        dialog.set_current_name("Untitled")
        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
            dialog.destroy()
            on_success(self, filename)
        elif response == Gtk.ResponseType.CANCEL:
            self.info("Save cancelled.")  # print("Cancel clicked")
            dialog.destroy()

    def on_fileopengerber(self, param):
        """
        Callback for menu item File->Open Gerber. Defines a function that is then passed
        to ``self.file_chooser_action()``. It requests the creation of a FlatCAMGerber object
        and updates the progress bar throughout the process.

        :param param: Ignore
        :return: None
        """

        self.file_chooser_action(lambda ao, filename: self.open_gerber(filename))

    def on_fileopenexcellon(self, param):
        """
        Callback for menu item File->Open Excellon. Defines a function that is then passed
        to ``self.file_chooser_action()``. It requests the creation of a FlatCAMExcellon object
        and updates the progress bar throughout the process.

        :param param: Ignore
        :return: None
        """

        self.file_chooser_action(lambda ao, filename: self.open_excellon(filename))

    def on_fileopengcode(self, param):
        """
        Callback for menu item File->Open G-Code. Defines a function that is then passed
        to ``self.file_chooser_action()``. It requests the creation of a FlatCAMCNCjob object
        and updates the progress bar throughout the process.

        :param param: Ignore
        :return: None
        """

        self.file_chooser_action(lambda ao, filename: self.open_gcode(filename))

    def on_mouse_move_over_plot(self, event):
        """
        Callback for the mouse motion event over the plot. This event is generated
        by the Matplotlib backend and has been registered in ``self.__init__()``.
        For details, see: http://matplotlib.org/users/event_handling.html

        :param event: Contains information about the event.
        :return: None
        """

        try:  # May fail in case mouse not within axes
            self.position_label.set_label("X: %.4f   Y: %.4f" % (
                event.xdata, event.ydata))
            self.mouse = [event.xdata, event.ydata]

            # for subscriber in self.plot_mousemove_subscribers:
            #     self.plot_mousemove_subscribers[subscriber](event)

        except:
            self.position_label.set_label("")
            self.mouse = None

    def on_click_over_plot(self, event):
        """
        Callback for the mouse click event over the plot. This event is generated
        by the Matplotlib backend and has been registered in ``self.__init__()``.
        For details, see: http://matplotlib.org/users/event_handling.html

        Default actions are:

        * Copy coordinates to clipboard. Ex.: (65.5473, -13.2679)

        :param event: Contains information about the event, like which button
            was clicked, the pixel coordinates and the axes coordinates.
        :return: None
        """

        # So it can receive key presses
        self.plotcanvas.canvas.grab_focus()

        try:
            print 'button=%d, x=%d, y=%d, xdata=%f, ydata=%f' % (
                event.button, event.x, event.y, event.xdata, event.ydata)

            # TODO: This custom subscription mechanism is probably not necessary.
            # for subscriber in self.plot_click_subscribers:
            #     self.plot_click_subscribers[subscriber](event)

            self.clipboard.set_text("(%.4f, %.4f)" % (event.xdata, event.ydata), -1)

        except Exception, e:
            print "Outside plot!"

    def on_zoom_in(self, event):
        """
        Callback for zoom-in request. This can be either from the corresponding
        toolbar button or the '3' key when the canvas is focused. Calls ``self.zoom()``.

        :param event: Ignored.
        :return: None
        """
        self.plotcanvas.zoom(1.5)
        return

    def on_zoom_out(self, event):
        """
        Callback for zoom-out request. This can be either from the corresponding
        toolbar button or the '2' key when the canvas is focused. Calls ``self.zoom()``.

        :param event: Ignored.
        :return: None
        """
        self.plotcanvas.zoom(1 / 1.5)

    def on_zoom_fit(self, event):
        """
        Callback for zoom-out request. This can be either from the corresponding
        toolbar button or the '1' key when the canvas is focused. Calls ``self.adjust_axes()``
        with axes limits from the geometry bounds of all objects.

        :param event: Ignored.
        :return: None
        """
        xmin, ymin, xmax, ymax = self.collection.get_bounds()
        width = xmax - xmin
        height = ymax - ymin
        xmin -= 0.05 * width
        xmax += 0.05 * width
        ymin -= 0.05 * height
        ymax += 0.05 * height
        self.plotcanvas.adjust_axes(xmin, ymin, xmax, ymax)

    def on_key_over_plot(self, event):
        """
        Callback for the key pressed event when the canvas is focused. Keyboard
        shortcuts are handled here. So far, these are the shortcuts:

        ==========  ============================================
        Key         Action
        ==========  ============================================
        '1'         Zoom-fit. Fits the axes limits to the data.
        '2'         Zoom-out.
        '3'         Zoom-in.
        'm'         Toggle on-off the measuring tool.
        ==========  ============================================

        :param event: Ignored.
        :return: None
        """

        if event.key == '1':  # 1
            self.on_zoom_fit(None)
            return

        if event.key == '2':  # 2
            self.plotcanvas.zoom(1 / 1.5, self.mouse)
            return

        if event.key == '3':  # 3
            self.plotcanvas.zoom(1.5, self.mouse)
            return

        if event.key == 'm':
            if self.measure.toggle_active():
                self.info("Measuring tool ON")
            else:
                self.info("Measuring tool OFF")
            return


class BaseDraw:
    def __init__(self, plotcanvas, name=None):
        """

        :param plotcanvas: The PlotCanvas where the drawing tool will operate.
        :type plotcanvas: PlotCanvas
        """

        self.plotcanvas = plotcanvas

        # Must have unique axes
        charset = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890"
        self.name = name or [random.choice(charset) for i in range(20)]
        self.axes = self.plotcanvas.new_axes(self.name)


class DrawingObject(BaseDraw):
    def __init__(self, plotcanvas, name=None):
        """
        Possible objects are:

        * Point
        * Line
        * Rectangle
        * Circle
        * Polygon
        """

        BaseDraw.__init__(self, plotcanvas)
        self.properties = {}

    def plot(self):
        return

    def update_plot(self):
        self.axes.cla()
        self.plot()
        self.plotcanvas.auto_adjust_axes()


class DrawingPoint(DrawingObject):
    def __init__(self, plotcanvas, name=None, coord=None):
        DrawingObject.__init__(self, plotcanvas)

        self.properties.update({
            "coordinate": coord
        })

    def plot(self):
        x, y = self.properties["coordinate"]
        self.axes.plot(x, y, 'o')


class Measurement:
    def __init__(self, container, plotcanvas, update=None):
        self.update = update
        self.container = container
        self.frame = None
        self.label = None
        self.point1 = None
        self.point2 = None
        self.active = False
        self.plotcanvas = plotcanvas
        self.click_subscription = None
        self.move_subscription = None

    def toggle_active(self, *args):
        if self.active:  # Deactivate
            self.active = False
            self.container.remove(self.frame)
            if self.update is not None:
                self.update()
            self.plotcanvas.mpl_disconnect(self.click_subscription)
            self.plotcanvas.mpl_disconnect(self.move_subscription)
            return False
        else:  # Activate
            print "DEBUG: Activating Measurement Tool..."
            self.active = True
            self.click_subscription = self.plotcanvas.mpl_connect("button_press_event", self.on_click)
            self.move_subscription = self.plotcanvas.mpl_connect('motion_notify_event', self.on_move)
            self.frame = Gtk.Frame()
            self.frame.set_margin_right(5)
            self.frame.set_margin_top(3)
            align = Gtk.Alignment()
            align.set(0, 0.5, 0, 0)
            align.set_padding(4, 4, 4, 4)
            self.label = Gtk.Label()
            self.label.set_label("Click on a reference point...")
            abox = Gtk.Box.new(Gtk.Orientation.HORIZONTAL, 10)
            abox.pack_start(Gtk.Image.new_from_file('share/measure16.png'), False, False, 0)
            abox.pack_start(self.label, False, False, 0)
            align.add(abox)
            self.frame.add(align)
            self.container.pack_end(self.frame, False, True, 1)
            self.frame.show_all()
            return True

    def on_move(self, event):
        if self.point1 is None:
            self.label.set_label("Click on a reference point...")
        else:
            try:
                dx = event.xdata - self.point1[0]
                dy = event.ydata - self.point1[1]
                d = sqrt(dx**2 + dy**2)
                self.label.set_label("D = %.4f  D(x) = %.4f  D(y) = %.4f" % (d, dx, dy))
            except TypeError:
                pass
        if self.update is not None:
            self.update()

    def on_click(self, event):
            if self.point1 is None:
                self.point1 = (event.xdata, event.ydata)
            else:
                self.point2 = copy.copy(self.point1)
                self.point1 = (event.xdata, event.ydata)
            self.on_move(event)


class PlotCanvas:
    """
    Class handling the plotting area in the application.
    """

    def __init__(self, container):
        """
        The constructor configures the Matplotlib figure that
        will contain all plots, creates the base axes and connects
        events to the plotting area.

        :param container: The parent container in which to draw plots.
        :rtype: PlotCanvas
        """
        # Options
        self.x_margin = 15  # pixels
        self.y_margin = 25  # Pixels

        # Parent container
        self.container = container

        # Plots go onto a single matplotlib.figure
        self.figure = Figure(dpi=50)  # TODO: dpi needed?
        self.figure.patch.set_visible(False)

        # These axes show the ticks and grid. No plotting done here.
        # New axes must have a label, otherwise mpl returns an existing one.
        self.axes = self.figure.add_axes([0.05, 0.05, 0.9, 0.9], label="base", alpha=0.0)
        self.axes.set_aspect(1)
        self.axes.grid(True)

        # The canvas is the top level container (Gtk.DrawingArea)
        self.canvas = FigureCanvas(self.figure)
        self.canvas.set_hexpand(1)
        self.canvas.set_vexpand(1)
        self.canvas.set_can_focus(True)  # For key press

        # Attach to parent
        self.container.attach(self.canvas, 0, 0, 600, 400)  # TODO: Height and width are num. columns??

        # Events
        self.canvas.mpl_connect('motion_notify_event', self.on_mouse_move)
        self.canvas.connect('configure-event', self.auto_adjust_axes)
        self.canvas.add_events(Gdk.EventMask.SMOOTH_SCROLL_MASK)
        self.canvas.connect("scroll-event", self.on_scroll)
        self.canvas.mpl_connect('key_press_event', self.on_key_down)
        self.canvas.mpl_connect('key_release_event', self.on_key_up)

        self.mouse = [0, 0]
        self.key = None

    def on_key_down(self, event):
        """

        :param event:
        :return:
        """
        self.key = event.key

    def on_key_up(self, event):
        """

        :param event:
        :return:
        """
        self.key = None

    def mpl_connect(self, event_name, callback):
        """
        Attach an event handler to the canvas through the Matplotlib interface.

        :param event_name: Name of the event
        :type event_name: str
        :param callback: Function to call
        :type callback: func
        :return: Connection id
        :rtype: int
        """
        return self.canvas.mpl_connect(event_name, callback)

    def mpl_disconnect(self, cid):
        """
        Disconnect callback with the give id.
        :param cid: Callback id.
        :return: None
        """
        self.canvas.mpl_disconnect(cid)

    def connect(self, event_name, callback):
        """
        Attach an event handler to the canvas through the native GTK interface.

        :param event_name: Name of the event
        :type event_name: str
        :param callback: Function to call
        :type callback: function
        :return: Nothing
        """
        self.canvas.connect(event_name, callback)

    def clear(self):
        """
        Clears axes and figure.

        :return: None
        """

        # Clear
        self.axes.cla()
        self.figure.clf()

        # Re-build
        self.figure.add_axes(self.axes)
        self.axes.set_aspect(1)
        self.axes.grid(True)

        # Re-draw
        self.canvas.queue_draw()

    def adjust_axes(self, xmin, ymin, xmax, ymax):
        """
        Adjusts all axes while maintaining the use of the whole canvas
        and an aspect ratio to 1:1 between x and y axes. The parameters are an original
        request that will be modified to fit these restrictions.

        :param xmin: Requested minimum value for the X axis.
        :type xmin: float
        :param ymin: Requested minimum value for the Y axis.
        :type ymin: float
        :param xmax: Requested maximum value for the X axis.
        :type xmax: float
        :param ymax: Requested maximum value for the Y axis.
        :type ymax: float
        :return: None
        """

        print "PC.adjust_axes()"

        width = xmax - xmin
        height = ymax - ymin
        try:
            r = width / height
        except:
            print "ERROR: Height is", height
            return
        canvas_w, canvas_h = self.canvas.get_width_height()
        canvas_r = float(canvas_w) / canvas_h
        x_ratio = float(self.x_margin) / canvas_w
        y_ratio = float(self.y_margin) / canvas_h

        if r > canvas_r:
            ycenter = (ymin + ymax) / 2.0
            newheight = height * r / canvas_r
            ymin = ycenter - newheight / 2.0
            ymax = ycenter + newheight / 2.0
        else:
            xcenter = (xmax + ymin) / 2.0
            newwidth = width * canvas_r / r
            xmin = xcenter - newwidth / 2.0
            xmax = xcenter + newwidth / 2.0

        # Adjust axes
        for ax in self.figure.get_axes():
            if ax._label != 'base':
                ax.set_frame_on(False)  # No frame
                ax.set_xticks([])  # No tick
                ax.set_yticks([])  # No ticks
                ax.patch.set_visible(False)  # No background
                ax.set_aspect(1)
            ax.set_xlim((xmin, xmax))
            ax.set_ylim((ymin, ymax))
            ax.set_position([x_ratio, y_ratio, 1 - 2 * x_ratio, 1 - 2 * y_ratio])

        # Re-draw
        self.canvas.queue_draw()

    def auto_adjust_axes(self, *args):
        """
        Calls ``adjust_axes()`` using the extents of the base axes.

        :rtype : None
        :return: None
        """

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        self.adjust_axes(xmin, ymin, xmax, ymax)

    def zoom(self, factor, center=None):
        """
        Zooms the plot by factor around a given
        center point. Takes care of re-drawing.

        :param factor: Number by which to scale the plot.
        :type factor: float
        :param center: Coordinates [x, y] of the point around which to scale the plot.
        :type center: list
        :return: None
        """

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        width = xmax - xmin
        height = ymax - ymin

        if center is None or center == [None, None]:
            center = [(xmin + xmax) / 2.0, (ymin + ymax) / 2.0]

        # For keeping the point at the pointer location
        relx = (xmax - center[0]) / width
        rely = (ymax - center[1]) / height

        new_width = width / factor
        new_height = height / factor

        xmin = center[0] - new_width * (1 - relx)
        xmax = center[0] + new_width * relx
        ymin = center[1] - new_height * (1 - rely)
        ymax = center[1] + new_height * rely

        # Adjust axes
        for ax in self.figure.get_axes():
            ax.set_xlim((xmin, xmax))
            ax.set_ylim((ymin, ymax))

        # Re-draw
        self.canvas.queue_draw()

    def pan(self, x, y):
        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        width = xmax - xmin
        height = ymax - ymin

        # Adjust axes
        for ax in self.figure.get_axes():
            ax.set_xlim((xmin + x*width, xmax + x*width))
            ax.set_ylim((ymin + y*height, ymax + y*height))

        # Re-draw
        self.canvas.queue_draw()

    def new_axes(self, name):
        """
        Creates and returns an Axes object attached to this object's Figure.

        :param name: Unique label for the axes.
        :return: Axes attached to the figure.
        :rtype: Axes
        """

        return self.figure.add_axes([0.05, 0.05, 0.9, 0.9], label=name)

    def on_scroll(self, canvas, event):
        """
        Scroll event handler.

        :param canvas: The widget generating the event. Ignored.
        :param event: Event object containing the event information.
        :return: None
        """

        # So it can receive key presses
        self.canvas.grab_focus()

        # Event info
        z, direction = event.get_scroll_direction()

        if self.key is None:

            if direction is Gdk.ScrollDirection.UP:
                self.zoom(1.5, self.mouse)
            else:
                self.zoom(1/1.5, self.mouse)
            return

        if self.key == 'shift':

            if direction is Gdk.ScrollDirection.UP:
                self.pan(0.3, 0)
            else:
                self.pan(-0.3, 0)
            return

        if self.key == 'ctrl+control':

            if direction is Gdk.ScrollDirection.UP:
                self.pan(0, 0.3)
            else:
                self.pan(0, -0.3)
            return

    def on_mouse_move(self, event):
        """
        Mouse movement event hadler. Stores the coordinates.

        :param event: Contains information about the event.
        :return: None
        """
        self.mouse = [event.xdata, event.ydata]


class ObjectCollection:

    classdict = {
        "gerber": FlatCAMGerber,
        "excellon": FlatCAMExcellon,
        "cncjob": FlatCAMCNCjob,
        "geometry": FlatCAMGeometry
    }

    icon_files = {
        "gerber": "share/flatcam_icon16.png",
        "excellon": "share/drill16.png",
        "cncjob": "share/cnc16.png",
        "geometry": "share/geometry16.png"
    }

    def __init__(self):

        ### Icons for the list view
        self.icons = {}
        for kind in ObjectCollection.icon_files:
            self.icons[kind] = GdkPixbuf.Pixbuf.new_from_file(ObjectCollection.icon_files[kind])

        ### GUI List components
        ## Model
        self.store = Gtk.ListStore(FlatCAMObj)

        ## View
        self.view = Gtk.TreeView(model=self.store)
        #self.view.connect("row_activated", self.on_row_activated)
        self.tree_selection = self.view.get_selection()
        self.change_subscription = self.tree_selection.connect("changed", self.on_list_selection_change)

        ## Renderers
        # Icon
        renderer_pixbuf = Gtk.CellRendererPixbuf()
        column_pixbuf = Gtk.TreeViewColumn("Type", renderer_pixbuf)

        def _set_cell_icon(column, cell, model, it, data):
            obj = model.get_value(it, 0)
            cell.set_property('pixbuf', self.icons[obj.kind])

        column_pixbuf.set_cell_data_func(renderer_pixbuf, _set_cell_icon)
        self.view.append_column(column_pixbuf)

        # Name
        renderer_text = Gtk.CellRendererText()
        column_text = Gtk.TreeViewColumn("Name", renderer_text)

        def _set_cell_text(column, cell, model, it, data):
            obj = model.get_value(it, 0)
            cell.set_property('text', obj.options["name"])

        column_text.set_cell_data_func(renderer_text, _set_cell_text)
        self.view.append_column(column_text)

    def print_list(self):
        iterat = self.store.get_iter_first()
        while iterat is not None:
            obj = self.store[iterat][0]
            print obj
            iterat = self.store.iter_next(iterat)

    def delete_all(self):
        print "OC.delete_all()"
        # self.collection = []
        # self.active = None
        self.store.clear()

    def delete_active(self):
        print "OC.delete_active()"
        try:
            model, treeiter = self.tree_selection.get_selected()
            self.store.remove(treeiter)
        except:
            pass

    def on_row_activated(self, *args):
        """
        Does nothing right now.
        :param args: Ignored.
        :return: None
        """
        print "OC.on_row_activated()"
        return

    def on_list_selection_change(self, selection):
        """
        Callback for change in selection on the objects' list.
        Instructs the new selection to build the UI for its options.

        :param selection: Ignored.
        :return: None
        """
        print "OC.on_list_selection_change()"
        try:
            self.get_active().build_ui()
        except:
            pass

        # TODO: Now we don't have a reference to the previously
        # TODO: active, so cannot read form.

    def set_active(self, name):
        """
        Sets an object as the active object in the program. Same
        as `set_list_selection()`.

        :param name: Name of the object.
        :type name: str
        :return: None
        """
        print "OC.set_active()"
        self.set_list_selection(name)

    def get_active(self):
        print "OC.get_active()"
        try:
            model, treeiter = self.tree_selection.get_selected()
            return model[treeiter][0]
        except ValueError:
            return None

    def set_list_selection(self, name):
        """
        Sets which object should be selected in the list.

        :param name: Name of the object.
        :rtype name: str
        :return: None
        """
        print "OC.set_list_selection()"
        iterat = self.store.get_iter_first()
        while iterat is not None and self.store[iterat][0].options["name"] != name:
            iterat = self.store.iter_next(iterat)
        self.tree_selection.select_iter(iterat)

    def append(self, obj, active=False):
        """
        Add a FlatCAMObj the the collection. This method is thread-safe.

        :param obj: FlatCAMObj to append
        :type obj: FlatCAMObj
        :param active: If it is to become the active object after appending
        :type active: bool
        :return: None
        """
        print "OC.append()"

        def guitask():
            self.store.append([obj])
            if active:
                self.set_list_selection(obj.options["name"])
        GLib.idle_add(guitask)

    def get_names(self):
        """
        Gets a list of the names of all objects in the collection.

        :return: List of names.
        :rtype: list
        """
        print "OC.get_names()"
        names = []
        iterat = self.store.get_iter_first()
        while iterat is not None:
            obj = self.store[iterat][0]
            names.append(obj.options["name"])
            iterat = self.store.iter_next(iterat)
        return names

    def get_bounds(self):
        """
        Finds coordinates bounding all objects in the collection.

        :return: [xmin, ymin, xmax, ymax]
        :rtype: list
        """
        print "OC.get_bounds()"

        # TODO: Move the operation out of here.

        xmin = Inf
        ymin = Inf
        xmax = -Inf
        ymax = -Inf

        iterat = self.store.get_iter_first()
        while iterat is not None:
            obj = self.store[iterat][0]
            try:
                gxmin, gymin, gxmax, gymax = obj.bounds()
                xmin = min([xmin, gxmin])
                ymin = min([ymin, gymin])
                xmax = max([xmax, gxmax])
                ymax = max([ymax, gymax])
            except:
                print "DEV WARNING: Tried to get bounds of empty geometry."
            iterat = self.store.iter_next(iterat)
        return [xmin, ymin, xmax, ymax]

    def get_list(self):
        """
        Returns a list with all FlatCAMObj.

        :return: List with all FlatCAMObj.
        :rtype: list
        """
        collection_list = []
        iterat = self.store.get_iter_first()
        while iterat is not None:
            obj = self.store[iterat][0]
            collection_list.append(obj)
            iterat = self.store.iter_next(iterat)
        return collection_list

    def get_by_name(self, name):
        """
        Fetches the FlatCAMObj with the given `name`.

        :param name: The name of the object.
        :type name: str
        :return: The requested object or None if no such object.
        :rtype: FlatCAMObj or None
        """
        iterat = self.store.get_iter_first()
        while iterat is not None:
            obj = self.store[iterat][0]
            if obj.options["name"] == name:
                return obj
            iterat = self.store.iter_next(iterat)
        return None

    def change_name(self, old_name, new_name):
        """
        Changes the name of `FlatCAMObj` named `old_name` to `new_name`.

        :param old_name: Name of the object to change.
        :type old_name: str
        :param new_name: New name.
        :type new_name: str
        :return: True if name change succeeded, False otherwise. Will fail
           if no object with `old_name` is found.
        :rtype: bool
        """
        iterat = self.store.get_iter_first()
        while iterat is not None:
            obj = self.store[iterat][0]
            if obj.options["name"] == old_name:
                obj.options["name"] = new_name
                self.store.row_changed(0, iterat)
                return True
            iterat = self.store.iter_next(iterat)
        return False


app = App()
Gtk.main()