예제 #1
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    def run_about_dialog(self, menuitem):
        """
        Run the "About" dialog.
        """
        def destroyed(widget):
            self._about_dialog = None

        # Need to hold a reference, so the object does not get garbage collected
        self._about_dialog = AboutDialog(self)
        self._about_dialog.connect("destroy", destroyed)
        self._about_dialog.run_nonblocking()
예제 #2
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 def run_about_dialog(self, menuitem):
     """
     Run the "About" dialog.
     """
     def destroyed(widget):
         self._about_dialog = None
     # Need to hold a reference, so the object does not get garbage collected
     self._about_dialog = AboutDialog(self)
     self._about_dialog.connect("destroy", destroyed)
     self._about_dialog.run_nonblocking()
예제 #3
0
class MainWindow(Gtk.Window):
    """
    Cournals main window
    """
    def __init__(self, **args):
        """
        Constructor.
        
        Keyword arguments:
        **args -- Arguments passed to the Gtk.Window constructor
        """
        Gtk.Window.__init__(self, title=_("Cournal"), **args)
        network.set_window(self)
        
        self.overlaybox = None
        self.document = None
        self.last_filename = None
        
        self.set_default_size(width=500, height=700)
        self.set_icon_name("cournal")
        
        # Bob the builder
        builder = Gtk.Builder()
        builder.set_translation_domain("cournal")
        builder.add_from_file(cournal.__path__[0] + "/mainwindow.glade")
        self.add(builder.get_object("outer_box"))
        self.add_accel_group(builder.get_object("accelgroup"))
        self.layout = None
        self.overlay = builder.get_object("overlay")
        self.scrolledwindow = builder.get_object("scrolledwindow")
        
        # Actions (always sensitive):
        action_open_xoj = builder.get_object("action_open_xoj")
        action_open_pdf = builder.get_object("action_open_pdf")
        action_quit = builder.get_object("action_quit")
        action_about = builder.get_object("action_about")
        
        # Actions (document_specific):
        action_connect = builder.get_object("action_connect")
        action_save = builder.get_object("action_save")
        action_save_as = builder.get_object("action_save_as")
        action_export_pdf = builder.get_object("action_export_pdf")
        action_import_xoj = builder.get_object("action_import_xoj")
        action_undo = builder.get_object("action_undo")
        action_redo = builder.get_object("action_redo")
        action_search = builder.get_object("action_search")
        action_zoom_in = builder.get_object("action_zoom_in")
        action_zoom_out = builder.get_object("action_zoom_out")
        action_zoom_fit = builder.get_object("action_zoom_fit")
        action_pensize_small = builder.get_object("action_pensize_small")
        action_pensize_normal = builder.get_object("action_pensize_normal")
        action_pensize_big = builder.get_object("action_pensize_big")
        tool_pen_color = builder.get_object("tool_pen_color")
        self.actiongroup_document_specific = builder.get_object("actiongroup_document_specific")
        self.actiongroup_document_specific.set_sensitive(False)
        builder.get_object("tool_pensize_normal").set_active(True)
        
        # Workaround for bug https://bugzilla.gnome.org/show_bug.cgi?id=671786
        if not Gtk.check_version(3,6,0) == None:
            # Gtk 3.4 or older
            a = builder.get_object("accelgroup")
            a.connect_by_path(action_open_xoj.get_accel_path(), lambda a,b,c,d: action_open_xoj.activate())
            a.connect_by_path(action_open_pdf.get_accel_path(), lambda a,b,c,d: action_open_pdf.activate())
            a.connect_by_path(action_quit.get_accel_path(), lambda a,b,c,d: action_quit.activate())
            a.connect_by_path(action_about.get_accel_path(), lambda a,b,c,d: action_about.activate())
            a.connect_by_path(action_connect.get_accel_path(), lambda a,b,c,d: action_connect.activate())
            a.connect_by_path(action_save.get_accel_path(), lambda a,b,c,d: action_save.activate())
            a.connect_by_path(action_save_as.get_accel_path(), lambda a,b,c,d: action_save_as.activate())
            a.connect_by_path(action_export_pdf.get_accel_path(), lambda a,b,c,d: action_export_pdf.activate())
            a.connect_by_path(action_import_xoj.get_accel_path(), lambda a,b,c,d: action_import_xoj.activate())
            a.connect_by_path(action_undo.get_accel_path(), lambda a,b,c,d: action_undo.activate())
            a.connect_by_path(action_redo.get_accel_path(), lambda a,b,c,d: action_redo.activate())
            a.connect_by_path(action_search.get_accel_path(), lambda a,b,c,d: action_search.activate())
            a.connect_by_path(action_zoom_in.get_accel_path(), lambda a,b,c,d: action_zoom_in.activate())
            a.connect_by_path(action_zoom_out.get_accel_path(), lambda a,b,c,d: action_zoom_out.activate())
            a.connect_by_path(action_zoom_fit.get_accel_path(), lambda a,b,c,d: action_zoom_fit.activate())
            a.connect_by_path(action_pensize_small.get_accel_path(), lambda a,b,c,d: action_pensize_small.activate())
            a.connect_by_path(action_pensize_normal.get_accel_path(), lambda a,b,c,d: action_pensize_normal.activate())
            a.connect_by_path(action_pensize_big.get_accel_path(), lambda a,b,c,d: action_pensize_big.activate())

        action_open_xoj.connect("activate", self.run_open_xoj_dialog)
        action_open_pdf.connect("activate", self.run_open_pdf_dialog)
        action_connect.connect("activate", self.run_connection_dialog)
        action_save.connect("activate", self.save)
        action_save_as.connect("activate", self.run_save_as_dialog)
        action_export_pdf.connect("activate", self.run_export_pdf_dialog)
        action_import_xoj.connect("activate", self.run_import_xoj_dialog)
        action_quit.connect("activate", lambda _: self.destroy())
        action_about.connect("activate", self.run_about_dialog)
        action_undo.connect("activate", history.undo)
        action_redo.connect("activate", history.redo)
        action_search.connect("activate", self.show_search_bar)
        action_zoom_in.connect("activate", self.zoom_in)
        action_zoom_out.connect("activate", self.zoom_out)
        action_zoom_fit.connect("activate", self.zoom_fit)
        tool_pen_color.connect("color-set", self.change_pen_color)
        action_pensize_small.connect("activate", self.change_pen_size, LINEWIDTH_SMALL)
        action_pensize_normal.connect("activate", self.change_pen_size, LINEWIDTH_NORMAL)
        action_pensize_big.connect("activate", self.change_pen_size, LINEWIDTH_BIG)
    
        # Statusbar:
        self.statusbar_icon = builder.get_object("image_statusbar")
        self.statusbar_pagenum = builder.get_object("label_statusbar_center")
        self.statusbar_pagenum_entry = builder.get_object("entry_statusbar_page_num")
        self.button_prev_page = builder.get_object("btn_prev_page")
        self.button_next_page = builder.get_object("btn_next_page")
        self.vadjustment = self.scrolledwindow.get_vadjustment()
        self.vadjustment.connect("value_changed", self.show_page_numbers)
        self.statusbar_pagenum_entry.connect("insert-text", self.jump_to_page_control)
        self.statusbar_pagenum_entry.connect("activate", self.jump_to_page)
        self.button_prev_page.connect("clicked", self.jump_to_prev_page)
        self.button_next_page.connect("clicked", self.jump_to_next_page)

        history.init(action_undo, action_redo)
        
        # Search bar:
        self.search_bar = builder.get_object("search_bar")
        self.search_field = builder.get_object("search_field")
        self.search_button = builder.get_object("search_button")
        self.search_close = builder.get_object("search_close")
        self.hadjustment = self.scrolledwindow.get_hadjustment()
        
        self.search_field.connect("insert-text", self.reset_search)
        self.search_close.connect("clicked", self.hide_search_bar)
        self.search_button.connect("clicked", self.search_document)
        self.search_field.connect("activate", self.search_document)

    def connect_event(self):
        """
        Called by the networking layer when a connection is established.
        Set the statusbar icon accordingly.
        """
        self.statusbar_icon.set_from_stock(Gtk.STOCK_CONNECT, Gtk.IconSize.SMALL_TOOLBAR)

    def disconnect_event(self):
        """
        Called by the networking code, when we get disconnected from the server.
        """
        self.statusbar_icon.set_from_stock(Gtk.STOCK_DISCONNECT, Gtk.IconSize.SMALL_TOOLBAR)
    
    def connection_problems(self):
        """
        Called by the networking code, when the server did not respond for
        some time or when we are disconnected.
        """
        def destroyed(widget):
            self.overlaybox = None
            # Do we run on Gtk 3.2?
            if Gtk.check_version(3,4,0) != None: self.overlay.add(self.scrolledwindow)

        if self.overlaybox is not None:
            return
        
        self.overlaybox = OverlayDialog()
        # GtkOverlay is broken in Gtk 3.2, so we apply a workaround:
        if Gtk.check_version(3,4,0) == None:
            # Gtk 3.4+
            self.overlay.add_overlay(self.overlaybox)
        else:
            # Gtk 3.2
            if self.overlay.get_child() == self.scrolledwindow:
                self.overlay.remove(self.scrolledwindow)
            self.overlay.add(self.overlaybox)
        self.overlaybox.connect("destroy", destroyed)
    
    def search_document(self, menuitem):
        """
        Search document
        """
        # delete last results marker
        last_page = search.get_last_result_page()
        if last_page > -1:
            for page in self.document.pages:
                if page.number == int(last_page):
                    page.widget.delete_search_marker()
        result_page, result_pos = search.search(self.search_field.get_text())
        if result_page > -1:
            self.statusbar_pagenum_entry.set_text(str(result_page+1))
            for page in self.document.pages:
                if page.number == int(result_page):
                    page.widget.draw_search_marker(result_pos)
                    self.vadjustment.set_value(page.widget.get_allocation().y + page.widget.widget_height * (page.height-result_pos.y2) / page.height)
                    self.hadjustment.set_value(page.widget.widget_width * result_pos.x1 / page.width)
        else:
            self.search_field.modify_fg(0,Gdk.Color(65535,0,0))
            
    def show_search_bar(self, menuitem):
        """
        Show a search bar at the bottom of the window.
        """
        self.search_bar.set_visible(True)
        self.search_field.modify_fg(0, Gdk.Color(0,0,0))
        Gtk.Window.set_focus(self, self.search_field)

    def hide_search_bar(self, menuitem):
        """
        Hide the search bar.
        """
        self.search_bar.set_visible(False)
        # delete last results marker
        last_page = search.get_last_result_page()
        if last_page > -1:
            for page in self.document.pages:
                if page.number == int(last_page):
                    page.widget.delete_search_marker()
        search.reset()

    def reset_search(self, one, two, three, four):
        """
        Reset search.
        """
        # delete last results marker
        self.search_bar.set_visible(True)
        self.search_field.modify_fg(0, Gdk.Color(0,0,0))
        last_page = search.get_last_result_page()
        if last_page > -1:
            for page in self.document.pages:
                if page.number == int(last_page):
                    page.widget.delete_search_marker()
        search.reset()

    def _set_document(self, document):
        """
        Replace the current document (if any) with a new one.
        
        Positional arguments:
        document -- The new Document object.
        """
        self.document = document
        for child in self.scrolledwindow.get_children():
            self.scrolledwindow.remove(child)
        self.layout = Layout(self.document)
        self.scrolledwindow.add(self.layout)
        self.scrolledwindow.show_all()
        self.last_filename = None
        
        self.actiongroup_document_specific.set_sensitive(True)
        if self.document.num_of_pages > 1:
            self.button_next_page.set_sensitive(True)
        
        # at this point we always start at page 1. If the feature to resume last page is included
        # remove this and start the method show_page_numbers() with adjustment
        self.statusbar_pagenum.set_text(_(" of {:3}").format(self.document.num_of_pages))
        self.curr_page = 1
        self.statusbar_pagenum_entry.set_text(str(self.curr_page))

        # Hide the disconnection overlay dialog when the user opens a new doc
        if self.overlaybox:
            self.overlaybox.destroy()
    
    def show_page_numbers(self, curr_vadjustment):
        """
        Show current and absolute Page number in the center of the Statusbar.
        To achive that the current visible window and page size are compared if there is a intersection.
        If so and more than 60% of the new page are shown the current shown page number is updatet.

        Positional Arguments:
        curr_vadjustemnt - current vertical adjustment of the scrollbar
        """
        biggest_intersection = [0,0]
 
        for page in self.document.pages:
            rectangle = Gdk.Rectangle()
            intersection = Gdk.Rectangle()
            # horizontal adjustment is always 0, because the horizontal adjustment does not matter
            rectangle.x = 0
            rectangle.y = curr_vadjustment.get_value() 
            rectangle.height = self.layout.get_allocation().height 
            rectangle.width = self.layout.get_allocation().width
            # calculation should work in most cases (visible pages <= 3)
            intersect = page.widget.intersect(rectangle, intersection)
            if intersect and (intersection.height > page.widget.get_allocated_height() * 0.6):
                self.curr_page = page.number + 1
                self.statusbar_pagenum_entry.set_text(str(self.curr_page))
                self.update_button_sensitivity()
                return
            if intersection.height > biggest_intersection[0]:
                biggest_intersection[0] = intersection.height
                biggest_intersection[1] = page.number + 1
        # fallback if no page has a overall visibility of more than 60%. In this case the page with the highest visibility is choosen
        self.curr_page = biggest_intersection[1]
        self.statusbar_pagenum_entry.set_text(str(self.curr_page))
        self.update_button_sensitivity()

    def update_button_sensitivity(self):
        """
        Sensitivity of buttons is set / unset if a specific page is reached.
        """
        if self.curr_page == 1:
            self.button_prev_page.set_sensitive(False)
        else:
            self.button_prev_page.set_sensitive(True)
        
        if self.curr_page == self.document.num_of_pages:
            self.button_next_page.set_sensitive(False)
        else:
            self.button_next_page.set_sensitive(True)

    def jump_to_page_control(self, page_num, text, length, position):
        """
        Checks if only valid data is inserted.
        Called each time the user changes the page number entry.

        Positional arguments: (see GtkEditable "insert-text" documentation)
        widget -- The widget that was updated.
        text -- The text to append.
        length -- The length of the text in bytes, or -1.
        position -- Location of the position text will be inserted at as gpointer.
        """
        position = page_num.get_position()
        old_text = page_num.get_text()
        try:
            insert_num = int(old_text[:position] + text + old_text[position:])
        except:
            page_num.emit_stop_by_name("insert_text")
        if not text.isdigit() or insert_num > self.document.num_of_pages or insert_num == 0:
            page_num.emit_stop_by_name("insert_text")
        
    def jump_to_page(self, page_num_widget):
        """
        Sets the vertical adjustment of the scrollbar to the page the user wishes to jump to.
        Called each time the page number entry is updated.

        Positional arguments:
        page_num_widget: The Entry widget that was updated.
        """
        for page in self.document.pages:
            if page.number + 1 == int(page_num_widget.get_text()):
                self.vadjustment.set_value(page.widget.get_allocation().y)
                return
    
    def jump_to_next_page(self, menuitem):
        """
        Jump to the next page
        called each time the button_next_page is pressed
        """
        self.statusbar_pagenum_entry.set_text(str(self.curr_page + 1)) 
        self.statusbar_pagenum_entry.activate()

    def jump_to_prev_page(self, menuitem):
        """
        Jump to the previous page
        called each time the button_prev_page is pressed
        """
        self.statusbar_pagenum_entry.set_text(str(self.curr_page - 1)) 
        self.statusbar_pagenum_entry.activate()
    
    def run_open_pdf_dialog(self, menuitem):
        """
        Run an "Open PDF" dialog and create a new document with that PDF.
        """
        dialog = Gtk.FileChooserDialog(_("Open File"), self, Gtk.FileChooserAction.OPEN,
                                       (Gtk.STOCK_OPEN, Gtk.ResponseType.ACCEPT,
                                        Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL))
        dialog.set_filter(pdf_filter)
        
        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            
            try:
                document = Document(filename)
            except GError as ex:
                self.run_error_dialog(_("Unable to open PDF"), ex)
                dialog.destroy()
                return
            self._set_document(document)
        dialog.destroy()
    
    def run_connection_dialog(self, menuitem):
        """
        Run a "Connect to Server" dialog.
        """
        def destroyed(widget):
            self._connection_dialog = None
        # Need to hold a reference, so the object does not get garbage collected
        self._connection_dialog = ConnectionDialog(self)
        self._connection_dialog.connect("destroy", destroyed)
        self._connection_dialog.run_nonblocking()
        
    def run_import_xoj_dialog(self, menuitem):
        """
        Run an "Import .xoj" dialog and import the strokes.
        """
        dialog = Gtk.FileChooserDialog(_("Open File"), self, Gtk.FileChooserAction.OPEN,
                                       (Gtk.STOCK_OPEN, Gtk.ResponseType.ACCEPT,
                                        Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL))
        dialog.set_filter(xoj_filter)

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            xojparser.import_into_document(self.document, filename, self)
        dialog.destroy()
    
    def run_open_xoj_dialog(self, menuitem):
        """
        Run an "Open .xoj" dialog and create a new document from a .xoj file.
        """
        dialog = Gtk.FileChooserDialog(_("Open File"), self, Gtk.FileChooserAction.OPEN,
                                       (Gtk.STOCK_OPEN, Gtk.ResponseType.ACCEPT,
                                        Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL))
        dialog.set_filter(xoj_filter)

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            try:
                document = xojparser.new_document(filename, self)
            except Exception as ex:
                print(ex)
                dialog.destroy()
                return
            self._set_document(document)
            self.last_filename = filename
        dialog.destroy()

    def save(self, menuitem):
        """
        Save document to the last known filename or ask the user for a location.
        
        Positional arguments:
        menuitem -- The menu item, that triggered this function
        """
        if self.last_filename:
            self.document.save_xoj_file(self.last_filename)
        else:
            self.run_save_as_dialog(menuitem)
    
    def run_save_as_dialog(self, menuitem):
        """
        Run a "Save as" dialog and save the document to a .xoj file
        """
        dialog = Gtk.FileChooserDialog(_("Save File As"), self, Gtk.FileChooserAction.SAVE,
                                       (Gtk.STOCK_SAVE, Gtk.ResponseType.ACCEPT,
                                        Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL))
        dialog.set_filter(xoj_filter)
        dialog.set_current_name("document.xoj")

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            self.document.save_xoj_file(filename)
            self.last_filename = filename
        dialog.destroy()

    def run_export_pdf_dialog(self, menuitem):
        """
        Run an "Export" dialog and save the document to a PDF file.
        """
        dialog = Gtk.FileChooserDialog(_("Export PDF"), self, Gtk.FileChooserAction.SAVE,
                                       (Gtk.STOCK_SAVE, Gtk.ResponseType.ACCEPT,
                                        Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL))
        dialog.set_filter(pdf_filter)
        dialog.set_current_name("annotated_document.pdf")
        
        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            self.document.export_pdf(filename)
        dialog.destroy()
        
    def run_about_dialog(self, menuitem):
        """
        Run the "About" dialog.
        """
        def destroyed(widget):
            self._about_dialog = None
        # Need to hold a reference, so the object does not get garbage collected
        self._about_dialog = AboutDialog(self)
        self._about_dialog.connect("destroy", destroyed)
        self._about_dialog.run_nonblocking()
    
    def run_error_dialog(self, first, second):
        """
        Display an error dialog
        
        Positional arguments:
        first -- Primary text of the message
        second -- Secondary text of the message
        """
        print(_("Unable to open PDF file: {}").format(second))
        message = Gtk.MessageDialog(self, (Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT), Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, first)
        message.format_secondary_text(second)
        message.set_title("Error")
        message.connect("response", lambda _,x: message.destroy())
        message.show()
        
    def change_pen_color(self, colorbutton):
        """
        Change the pen to a user defined color.
        
        Positional arguments:
        colorbutton -- The Gtk.ColorButton, that triggered this function
        """
        color = colorbutton.get_rgba()
        red = int(color.red*255)
        green = int(color.green*255)
        blue = int(color.blue*255)
        opacity = int(color.alpha*255)
        
        pen.color = red, green, blue, opacity        
    
    def change_pen_size(self, menuitem, linewidth):
        """
        Change the pen to a user defined line width.
        
        Positional arguments:
        menuitem -- The menu item, that triggered this function
        linewidth -- New line width of the pen
        """
        pen.linewidth = linewidth
        
    def zoom_in(self, menuitem):
        """Magnify document"""
        self.layout.set_zoomlevel(change=0.2)
    
    def zoom_out(self, menuitem):
        """Zoom out"""
        self.layout.set_zoomlevel(change=-0.2)
    
    def zoom_fit(self, menuitem):
        """Reset Zoom"""
        self.layout.set_zoomlevel(1)
예제 #4
0
class MainWindow(Gtk.Window):
    """
    Cournals main window
    """
    def __init__(self, **args):
        """
        Constructor.
        
        Keyword arguments:
        **args -- Arguments passed to the Gtk.Window constructor
        """
        Gtk.Window.__init__(self, title=_("Cournal"), **args)
        network.set_window(self)

        self.overlaybox = None
        self.document = None
        self.last_filename = None

        self.set_default_size(width=500, height=700)
        self.set_icon_name("cournal")

        # Bob the builder
        builder = Gtk.Builder()
        builder.set_translation_domain("cournal")
        builder.add_from_file(
            os.path.join(cournal.__path__[0], "mainwindow.glade"))
        self.add(builder.get_object("outer_box"))
        self.add_accel_group(builder.get_object("accelgroup"))
        self.layout = None
        self.overlay = builder.get_object("overlay")
        self.scrolledwindow = builder.get_object("scrolledwindow")

        # Actions (always sensitive):
        action_open_xoj = builder.get_object("action_open_xoj")
        action_open_pdf = builder.get_object("action_open_pdf")
        action_quit = builder.get_object("action_quit")
        action_about = builder.get_object("action_about")

        # Actions (document_specific):
        action_connect = builder.get_object("action_connect")
        action_save = builder.get_object("action_save")
        action_save_as = builder.get_object("action_save_as")
        action_export_pdf = builder.get_object("action_export_pdf")
        action_import_xoj = builder.get_object("action_import_xoj")
        action_undo = builder.get_object("action_undo")
        action_redo = builder.get_object("action_redo")
        action_search = builder.get_object("action_search")
        action_zoom_in = builder.get_object("action_zoom_in")
        action_zoom_out = builder.get_object("action_zoom_out")
        action_zoom_fit = builder.get_object("action_zoom_fit")
        action_pensize_small = builder.get_object("action_pensize_small")
        action_pensize_normal = builder.get_object("action_pensize_normal")
        action_pensize_big = builder.get_object("action_pensize_big")
        tool_pen_color = builder.get_object("tool_pen_color")
        self.actiongroup_document_specific = builder.get_object(
            "actiongroup_document_specific")
        self.actiongroup_document_specific.set_sensitive(False)
        builder.get_object("tool_pensize_normal").set_active(True)

        # Workaround for bug https://bugzilla.gnome.org/show_bug.cgi?id=671786
        if not Gtk.check_version(3, 6, 0) == None:
            # Gtk 3.4 or older
            a = builder.get_object("accelgroup")
            a.connect_by_path(action_open_xoj.get_accel_path(),
                              lambda a, b, c, d: action_open_xoj.activate())
            a.connect_by_path(action_open_pdf.get_accel_path(),
                              lambda a, b, c, d: action_open_pdf.activate())
            a.connect_by_path(action_quit.get_accel_path(),
                              lambda a, b, c, d: action_quit.activate())
            a.connect_by_path(action_about.get_accel_path(),
                              lambda a, b, c, d: action_about.activate())
            a.connect_by_path(action_connect.get_accel_path(),
                              lambda a, b, c, d: action_connect.activate())
            a.connect_by_path(action_save.get_accel_path(),
                              lambda a, b, c, d: action_save.activate())
            a.connect_by_path(action_save_as.get_accel_path(),
                              lambda a, b, c, d: action_save_as.activate())
            a.connect_by_path(action_export_pdf.get_accel_path(),
                              lambda a, b, c, d: action_export_pdf.activate())
            a.connect_by_path(action_import_xoj.get_accel_path(),
                              lambda a, b, c, d: action_import_xoj.activate())
            a.connect_by_path(action_undo.get_accel_path(),
                              lambda a, b, c, d: action_undo.activate())
            a.connect_by_path(action_redo.get_accel_path(),
                              lambda a, b, c, d: action_redo.activate())
            a.connect_by_path(action_search.get_accel_path(),
                              lambda a, b, c, d: action_search.activate())
            a.connect_by_path(action_zoom_in.get_accel_path(),
                              lambda a, b, c, d: action_zoom_in.activate())
            a.connect_by_path(action_zoom_out.get_accel_path(),
                              lambda a, b, c, d: action_zoom_out.activate())
            a.connect_by_path(action_zoom_fit.get_accel_path(),
                              lambda a, b, c, d: action_zoom_fit.activate())
            a.connect_by_path(
                action_pensize_small.get_accel_path(),
                lambda a, b, c, d: action_pensize_small.activate())
            a.connect_by_path(
                action_pensize_normal.get_accel_path(),
                lambda a, b, c, d: action_pensize_normal.activate())
            a.connect_by_path(action_pensize_big.get_accel_path(),
                              lambda a, b, c, d: action_pensize_big.activate())

        action_open_xoj.connect("activate", self.run_open_xoj_dialog)
        action_open_pdf.connect("activate", self.run_open_pdf_dialog)
        action_connect.connect("activate", self.run_connection_dialog)
        action_save.connect("activate", self.save)
        action_save_as.connect("activate", self.run_save_as_dialog)
        action_export_pdf.connect("activate", self.run_export_pdf_dialog)
        action_import_xoj.connect("activate", self.run_import_xoj_dialog)
        action_quit.connect("activate", lambda _: self.destroy())
        action_about.connect("activate", self.run_about_dialog)
        action_undo.connect("activate", history.undo)
        action_redo.connect("activate", history.redo)
        action_search.connect("activate", self.show_search_bar)
        action_zoom_in.connect("activate", self.zoom_in)
        action_zoom_out.connect("activate", self.zoom_out)
        action_zoom_fit.connect("activate", self.zoom_fit)
        tool_pen_color.connect("color-set", self.change_pen_color)
        action_pensize_small.connect("activate", self.change_pen_size,
                                     LINEWIDTH_SMALL)
        action_pensize_normal.connect("activate", self.change_pen_size,
                                      LINEWIDTH_NORMAL)
        action_pensize_big.connect("activate", self.change_pen_size,
                                   LINEWIDTH_BIG)

        # Statusbar:
        self.statusbar_icon = builder.get_object("image_statusbar")
        self.statusbar_pagenum = builder.get_object("label_statusbar_center")
        self.statusbar_pagenum_entry = builder.get_object(
            "entry_statusbar_page_num")
        self.button_prev_page = builder.get_object("btn_prev_page")
        self.button_next_page = builder.get_object("btn_next_page")
        self.vadjustment = self.scrolledwindow.get_vadjustment()
        self.vadjustment.connect("value_changed", self.show_page_numbers)
        self.statusbar_pagenum_entry.connect("insert-text",
                                             self.jump_to_page_control)
        self.statusbar_pagenum_entry.connect("activate", self.jump_to_page)
        self.button_prev_page.connect("clicked", self.jump_to_prev_page)
        self.button_next_page.connect("clicked", self.jump_to_next_page)

        history.init(action_undo, action_redo)

        # Search bar:
        self.search_bar = builder.get_object("search_bar")
        self.search_field = builder.get_object("search_field")
        self.search_button = builder.get_object("search_button")
        self.search_close = builder.get_object("search_close")
        self.hadjustment = self.scrolledwindow.get_hadjustment()

        self.search_field.connect("insert-text", self.reset_search)
        self.search_close.connect("clicked", self.hide_search_bar)
        self.search_button.connect("clicked", self.search_document)
        self.search_field.connect("activate", self.search_document)

    def connect_event(self):
        """
        Called by the networking layer when a connection is established.
        Set the statusbar icon accordingly.
        """
        self.statusbar_icon.set_from_stock(Gtk.STOCK_CONNECT,
                                           Gtk.IconSize.SMALL_TOOLBAR)

    def disconnect_event(self):
        """
        Called by the networking code, when we get disconnected from the server.
        """
        self.statusbar_icon.set_from_stock(Gtk.STOCK_DISCONNECT,
                                           Gtk.IconSize.SMALL_TOOLBAR)

    def connection_problems(self):
        """
        Called by the networking code, when the server did not respond for
        some time or when we are disconnected.
        """
        def destroyed(widget):
            self.overlaybox = None
            # Do we run on Gtk 3.2?
            if Gtk.check_version(3, 4, 0) != None:
                self.overlay.add(self.scrolledwindow)

        if self.overlaybox is not None:
            return

        self.overlaybox = OverlayDialog()
        # GtkOverlay is broken in Gtk 3.2, so we apply a workaround:
        if Gtk.check_version(3, 4, 0) == None:
            # Gtk 3.4+
            self.overlay.add_overlay(self.overlaybox)
        else:
            # Gtk 3.2
            if self.overlay.get_child() == self.scrolledwindow:
                self.overlay.remove(self.scrolledwindow)
            self.overlay.add(self.overlaybox)
        self.overlaybox.connect("destroy", destroyed)

    def search_document(self, menuitem):
        """
        Search document
        """
        # delete last results marker
        last_page = search.get_last_result_page()
        if last_page > -1:
            for page in self.document.pages:
                if page.number == int(last_page):
                    page.widget.delete_search_marker()
        result_page, result_pos = search.search(self.search_field.get_text())
        if result_page > -1:
            self.statusbar_pagenum_entry.set_text(str(result_page + 1))
            for page in self.document.pages:
                if page.number == int(result_page):
                    page.widget.draw_search_marker(result_pos)
                    self.vadjustment.set_value(page.widget.get_allocation().y +
                                               page.widget.widget_height *
                                               (page.height - result_pos.y2) /
                                               page.height)
                    self.hadjustment.set_value(page.widget.widget_width *
                                               result_pos.x1 / page.width)
        else:
            self.search_field.modify_fg(0, Gdk.Color(65535, 0, 0))

    def show_search_bar(self, menuitem):
        """
        Show a search bar at the bottom of the window.
        """
        self.search_bar.set_visible(True)
        self.search_field.modify_fg(0, Gdk.Color(0, 0, 0))
        Gtk.Window.set_focus(self, self.search_field)

    def hide_search_bar(self, menuitem):
        """
        Hide the search bar.
        """
        self.search_bar.set_visible(False)
        # delete last results marker
        last_page = search.get_last_result_page()
        if last_page > -1:
            for page in self.document.pages:
                if page.number == int(last_page):
                    page.widget.delete_search_marker()
        search.reset()

    def reset_search(self, one, two, three, four):
        """
        Reset search.
        """
        # delete last results marker
        self.search_bar.set_visible(True)
        self.search_field.modify_fg(0, Gdk.Color(0, 0, 0))
        last_page = search.get_last_result_page()
        if last_page > -1:
            for page in self.document.pages:
                if page.number == int(last_page):
                    page.widget.delete_search_marker()
        search.reset()

    def _set_document(self, document):
        """
        Replace the current document (if any) with a new one.
        
        Positional arguments:
        document -- The new Document object.
        """
        self.document = document
        for child in self.scrolledwindow.get_children():
            self.scrolledwindow.remove(child)
        self.layout = Layout(self.document)
        self.scrolledwindow.add(self.layout)
        self.scrolledwindow.show_all()
        self.last_filename = None

        self.statusbar_pagenum.set_sensitive(True)
        self.statusbar_pagenum_entry.set_sensitive(True)
        self.actiongroup_document_specific.set_sensitive(True)
        if self.document.num_of_pages > 1:
            self.button_next_page.set_sensitive(True)

        # at this point we always start at page 1. If the feature to resume last page is included
        # remove this and start the method show_page_numbers() with adjustment
        self.statusbar_pagenum.set_text(
            _(" of {:3}").format(self.document.num_of_pages))
        self.curr_page = 1
        self.statusbar_pagenum_entry.set_text(str(self.curr_page))

        # Hide the disconnection overlay dialog when the user opens a new doc
        if self.overlaybox:
            self.overlaybox.destroy()

    def show_page_numbers(self, curr_vadjustment):
        """
        Show current and absolute Page number in the center of the Statusbar.
        To achive that the current visible window and page size are compared if there is a intersection.
        If so and more than 60% of the new page are shown the current shown page number is updatet.

        Positional Arguments:
        curr_vadjustemnt - current vertical adjustment of the scrollbar
        """
        biggest_intersection = [0, 0]

        for page in self.document.pages:
            rectangle = Gdk.Rectangle()
            intersection = Gdk.Rectangle()
            # horizontal adjustment is always 0, because the horizontal adjustment does not matter
            rectangle.x = 0
            rectangle.y = curr_vadjustment.get_value()
            rectangle.height = self.layout.get_allocation().height
            rectangle.width = self.layout.get_allocation().width
            # calculation should work in most cases (visible pages <= 3)
            intersect = page.widget.intersect(rectangle, intersection)
            if intersect and (intersection.height >
                              page.widget.get_allocated_height() * 0.6):
                self.curr_page = page.number + 1
                self.statusbar_pagenum_entry.set_text(str(self.curr_page))
                self.update_button_sensitivity()
                return
            if intersection.height > biggest_intersection[0]:
                biggest_intersection[0] = intersection.height
                biggest_intersection[1] = page.number + 1
        # fallback if no page has a overall visibility of more than 60%. In this case the page with the highest visibility is choosen
        self.curr_page = biggest_intersection[1]
        self.statusbar_pagenum_entry.set_text(str(self.curr_page))
        self.update_button_sensitivity()

    def update_button_sensitivity(self):
        """
        Sensitivity of buttons is set / unset if a specific page is reached.
        """
        if self.curr_page == 1:
            self.button_prev_page.set_sensitive(False)
        else:
            self.button_prev_page.set_sensitive(True)

        if self.curr_page == self.document.num_of_pages:
            self.button_next_page.set_sensitive(False)
        else:
            self.button_next_page.set_sensitive(True)

    def jump_to_page_control(self, page_num, text, length, position):
        """
        Checks if only valid data is inserted.
        Called each time the user changes the page number entry.

        Positional arguments: (see GtkEditable "insert-text" documentation)
        widget -- The widget that was updated.
        text -- The text to append.
        length -- The length of the text in bytes, or -1.
        position -- Location of the position text will be inserted at as gpointer.
        """
        position = page_num.get_position()
        old_text = page_num.get_text()
        try:
            insert_num = int(old_text[:position] + text + old_text[position:])
        except:
            page_num.emit_stop_by_name("insert_text")
        if not text.isdigit(
        ) or insert_num > self.document.num_of_pages or insert_num == 0:
            page_num.emit_stop_by_name("insert_text")

    def jump_to_page(self, page_num_widget):
        """
        Sets the vertical adjustment of the scrollbar to the page the user wishes to jump to.
        Called each time the page number entry is updated.

        Positional arguments:
        page_num_widget: The Entry widget that was updated.
        """
        try:
            page = self.document.pages[int(page_num_widget.get_text()) - 1]
            self.vadjustment.set_value(page.widget.get_allocation().y)
        except Exception as ex:
            pass

    def jump_to_next_page(self, menuitem):
        """
        Jump to the next page
        called each time the button_next_page is pressed
        """
        self.statusbar_pagenum_entry.set_text(str(self.curr_page + 1))
        self.statusbar_pagenum_entry.activate()

    def jump_to_prev_page(self, menuitem):
        """
        Jump to the previous page
        called each time the button_prev_page is pressed
        """
        self.statusbar_pagenum_entry.set_text(str(self.curr_page - 1))
        self.statusbar_pagenum_entry.activate()

    def run_open_pdf_dialog(self, menuitem):
        """
        Run an "Open PDF" dialog and create a new document with that PDF.
        """
        dialog = Gtk.FileChooserDialog(
            _("Open File"), self, Gtk.FileChooserAction.OPEN,
            (Gtk.STOCK_OPEN, Gtk.ResponseType.ACCEPT, Gtk.STOCK_CANCEL,
             Gtk.ResponseType.CANCEL))
        dialog.set_filter(pdf_filter)

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()

            try:
                document = Document(filename)
            except GError as ex:
                self.run_error_dialog(_("Unable to open PDF"), ex)
                dialog.destroy()
                return
            self._set_document(document)
        dialog.destroy()

    def run_connection_dialog(self, menuitem):
        """
        Run a "Connect to Server" dialog.
        """
        def destroyed(widget):
            self._connection_dialog = None

        # Need to hold a reference, so the object does not get garbage collected
        self._connection_dialog = ConnectionDialog(self)
        self._connection_dialog.connect("destroy", destroyed)
        self._connection_dialog.run_nonblocking()

    def run_import_xoj_dialog(self, menuitem):
        """
        Run an "Import .xoj" dialog and import the strokes.
        """
        dialog = Gtk.FileChooserDialog(
            _("Open File"), self, Gtk.FileChooserAction.OPEN,
            (Gtk.STOCK_OPEN, Gtk.ResponseType.ACCEPT, Gtk.STOCK_CANCEL,
             Gtk.ResponseType.CANCEL))
        dialog.set_filter(xoj_filter)

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            xojparser.import_into_document(self.document, filename, self)
        dialog.destroy()

    def run_open_xoj_dialog(self, menuitem):
        """
        Run an "Open .xoj" dialog and create a new document from a .xoj file.
        """
        dialog = Gtk.FileChooserDialog(
            _("Open File"), self, Gtk.FileChooserAction.OPEN,
            (Gtk.STOCK_OPEN, Gtk.ResponseType.ACCEPT, Gtk.STOCK_CANCEL,
             Gtk.ResponseType.CANCEL))
        dialog.set_filter(xoj_filter)

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            try:
                document = xojparser.new_document(filename, self)
            except Exception as ex:
                import traceback
                traceback.print_tb(ex.__traceback__)
                print(ex)
                dialog.destroy()
                return
            self._set_document(document)
            self.last_filename = filename
        dialog.destroy()

    def save(self, menuitem):
        """
        Save document to the last known filename or ask the user for a location.
        
        Positional arguments:
        menuitem -- The menu item, that triggered this function
        """
        if self.last_filename:
            self.document.save_xoj_file(self.last_filename)
        else:
            self.run_save_as_dialog(menuitem)

    def run_save_as_dialog(self, menuitem):
        """
        Run a "Save as" dialog and save the document to a .xoj file
        """
        dialog = Gtk.FileChooserDialog(
            _("Save File As"), self, Gtk.FileChooserAction.SAVE,
            (Gtk.STOCK_SAVE, Gtk.ResponseType.ACCEPT, Gtk.STOCK_CANCEL,
             Gtk.ResponseType.CANCEL))
        dialog.set_filter(xoj_filter)
        dialog.set_current_name("document.xoj")

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            self.document.save_xoj_file(filename)
            self.last_filename = filename
        dialog.destroy()

    def run_export_pdf_dialog(self, menuitem):
        """
        Run an "Export" dialog and save the document to a PDF file.
        """
        dialog = Gtk.FileChooserDialog(
            _("Export PDF"), self, Gtk.FileChooserAction.SAVE,
            (Gtk.STOCK_SAVE, Gtk.ResponseType.ACCEPT, Gtk.STOCK_CANCEL,
             Gtk.ResponseType.CANCEL))
        dialog.set_filter(pdf_filter)
        dialog.set_current_name("annotated_document.pdf")

        if dialog.run() == Gtk.ResponseType.ACCEPT:
            filename = dialog.get_filename()
            self.document.export_pdf(filename)
        dialog.destroy()

    def run_about_dialog(self, menuitem):
        """
        Run the "About" dialog.
        """
        def destroyed(widget):
            self._about_dialog = None

        # Need to hold a reference, so the object does not get garbage collected
        self._about_dialog = AboutDialog(self)
        self._about_dialog.connect("destroy", destroyed)
        self._about_dialog.run_nonblocking()

    def run_error_dialog(self, first, second):
        """
        Display an error dialog
        
        Positional arguments:
        first -- Primary text of the message
        second -- Secondary text of the message
        """
        print(_("Unable to open PDF file: {}").format(second))
        message = Gtk.MessageDialog(
            self,
            (Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT),
            Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, first)
        message.format_secondary_text(second)
        message.set_title("Error")
        message.connect("response", lambda _, x: message.destroy())
        message.show()

    def change_pen_color(self, colorbutton):
        """
        Change the pen to a user defined color.
        
        Positional arguments:
        colorbutton -- The Gtk.ColorButton, that triggered this function
        """
        color = Gdk.RGBA(0, 0, 0, 0)

        try:
            color = colorbutton.get_rgba()
        except TypeError:
            print("Your Gtk python bindings are broken, please update them")
            colorbutton.get_rgba(color)
        red = int(color.red * 255)
        green = int(color.green * 255)
        blue = int(color.blue * 255)
        opacity = int(color.alpha * 255)

        pen.color = red, green, blue, opacity

    def change_pen_size(self, menuitem, linewidth):
        """
        Change the pen to a user defined line width.
        
        Positional arguments:
        menuitem -- The menu item, that triggered this function
        linewidth -- New line width of the pen
        """
        pen.linewidth = linewidth

    def zoom_in(self, menuitem):
        """Magnify document"""
        self.layout.set_zoomlevel(change=0.2)

    def zoom_out(self, menuitem):
        """Zoom out"""
        self.layout.set_zoomlevel(change=-0.2)

    def zoom_fit(self, menuitem):
        """Reset Zoom"""
        self.layout.set_zoomlevel(1)