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43e6a43e3d
All of the removed `from __future__ import` were needed in older versions of Python (mostly 2.5.x and below) but later became mandatory in most versions of Python 3 hence are not necessary anymore. More specifically, according to __future__.py[1]: - unicode_literals is part of Python since versions 2.6.0 and 3.0.0; - print_function is part of Python since versions 2.6.0 and 3.0.0; - absolute_import is part of Python since versions 2.5.0 and 3.0.0; - division is part of Python since versions 2.2.0 and 3.0.0; Get rid of those unnecessary imports to slightly clean up the codebase. [1] https://github.com/python/cpython/blob/master/Lib/__future__.py
219 lines
7.9 KiB
Python
219 lines
7.9 KiB
Python
"""
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Copyright 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This file is part of GNU Radio
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SPDX-License-Identifier: GPL-2.0-or-later
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"""
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from gi.repository import Gtk, Gdk
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from .canvas.colors import FLOWGRAPH_BACKGROUND_COLOR
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from . import Constants
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from . import Actions
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class DrawingArea(Gtk.DrawingArea):
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"""
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DrawingArea is the gtk pixel map that graphical elements may draw themselves on.
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The drawing area also responds to mouse and key events.
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"""
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def __init__(self, flow_graph):
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"""
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DrawingArea constructor.
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Connect event handlers.
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Args:
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main_window: the main_window containing all flow graphs
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"""
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Gtk.DrawingArea.__init__(self)
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self._flow_graph = flow_graph
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self.set_property('can_focus', True)
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self.zoom_factor = 1.0
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self._update_after_zoom = False
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self.ctrl_mask = False
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self.mod1_mask = False
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self.button_state = [False] * 10
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# self.set_size_request(MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT)
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self.connect('realize', self._handle_window_realize)
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self.connect('draw', self.draw)
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self.connect('motion-notify-event', self._handle_mouse_motion)
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self.connect('button-press-event', self._handle_mouse_button_press)
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self.connect('button-release-event', self._handle_mouse_button_release)
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self.connect('scroll-event', self._handle_mouse_scroll)
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self.add_events(
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Gdk.EventMask.BUTTON_PRESS_MASK |
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Gdk.EventMask.POINTER_MOTION_MASK |
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Gdk.EventMask.BUTTON_RELEASE_MASK |
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Gdk.EventMask.SCROLL_MASK |
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Gdk.EventMask.LEAVE_NOTIFY_MASK |
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Gdk.EventMask.ENTER_NOTIFY_MASK
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# Gdk.EventMask.FOCUS_CHANGE_MASK
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)
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# This may not be the correct place to be handling the user events
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# Should this be in the page instead?
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# Or should more of the page functionality move here?
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# setup drag and drop
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self.drag_dest_set(Gtk.DestDefaults.ALL, [], Gdk.DragAction.COPY)
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self.connect('drag-data-received', self._handle_drag_data_received)
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self.drag_dest_set_target_list(None)
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self.drag_dest_add_text_targets()
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# setup the focus flag
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self._focus_flag = False
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self.get_focus_flag = lambda: self._focus_flag
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def _handle_notify_event(widget, event, focus_flag):
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self._focus_flag = focus_flag
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self.connect('leave-notify-event', _handle_notify_event, False)
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self.connect('enter-notify-event', _handle_notify_event, True)
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# todo: fix
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# self.set_flags(Gtk.CAN_FOCUS) # self.set_can_focus(True)
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# self.connect('focus-out-event', self._handle_focus_lost_event)
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##########################################################################
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# Handlers
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##########################################################################
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def _handle_drag_data_received(self, widget, drag_context, x, y, selection_data, info, time):
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"""
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Handle a drag and drop by adding a block at the given coordinate.
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"""
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coords = x / self.zoom_factor, y / self.zoom_factor
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self._flow_graph.add_new_block(selection_data.get_text(), coords)
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def _handle_mouse_scroll(self, widget, event):
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if event.get_state() & Gdk.ModifierType.CONTROL_MASK:
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change = 1.2 if event.direction == Gdk.ScrollDirection.UP else 1/1.2
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zoom_factor = min(max(self.zoom_factor * change, 0.1), 5.0)
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if zoom_factor != self.zoom_factor:
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self.zoom_factor = zoom_factor
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self._update_after_zoom = True
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self.queue_draw()
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return True
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return False
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def _handle_mouse_button_press(self, widget, event):
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"""
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Forward button click information to the flow graph.
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"""
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# The following line causes the canvas to reset position to 0,0
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# when changing focus from the console or block search back to
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# the canvas
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# Removing this line leaves the canvas alone when focus changes
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# self.grab_focus()
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self.ctrl_mask = event.get_state() & Gdk.ModifierType.CONTROL_MASK
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self.mod1_mask = event.get_state() & Gdk.ModifierType.MOD1_MASK
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self.button_state[event.button] = True
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if event.button == 1:
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double_click = (event.type == Gdk.EventType._2BUTTON_PRESS)
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self.button_state[1] = not double_click
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self._flow_graph.handle_mouse_selector_press(
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double_click=double_click,
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coordinate=self._translate_event_coords(event),
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)
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elif event.button == 3:
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self._flow_graph.handle_mouse_context_press(
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coordinate=self._translate_event_coords(event),
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event=event,
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)
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def _handle_mouse_button_release(self, widget, event):
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"""
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Forward button release information to the flow graph.
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"""
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self.ctrl_mask = event.get_state() & Gdk.ModifierType.CONTROL_MASK
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self.mod1_mask = event.get_state() & Gdk.ModifierType.MOD1_MASK
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self.button_state[event.button] = False
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if event.button == 1:
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self._flow_graph.handle_mouse_selector_release(
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coordinate=self._translate_event_coords(event),
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)
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def _handle_mouse_motion(self, widget, event):
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"""
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Forward mouse motion information to the flow graph.
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"""
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self.ctrl_mask = event.get_state() & Gdk.ModifierType.CONTROL_MASK
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self.mod1_mask = event.get_state() & Gdk.ModifierType.MOD1_MASK
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if self.button_state[1]:
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self._auto_scroll(event)
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self._flow_graph.handle_mouse_motion(
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coordinate=self._translate_event_coords(event),
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)
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def _update_size(self):
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w, h = self._flow_graph.get_extents()[2:]
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self.set_size_request(w * self.zoom_factor + 100, h * self.zoom_factor + 100)
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def _auto_scroll(self, event):
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x, y = event.x, event.y
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scrollbox = self.get_parent().get_parent()
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self._update_size()
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def scroll(pos, adj):
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"""scroll if we moved near the border"""
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adj_val = adj.get_value()
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adj_len = adj.get_page_size()
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if pos - adj_val > adj_len - Constants.SCROLL_PROXIMITY_SENSITIVITY:
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adj.set_value(adj_val + Constants.SCROLL_DISTANCE)
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adj.emit('changed')
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elif pos - adj_val < Constants.SCROLL_PROXIMITY_SENSITIVITY:
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adj.set_value(adj_val - Constants.SCROLL_DISTANCE)
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adj.emit('changed')
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scroll(x, scrollbox.get_hadjustment())
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scroll(y, scrollbox.get_vadjustment())
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def _handle_window_realize(self, widget):
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"""
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Called when the window is realized.
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Update the flowgraph, which calls new pixmap.
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"""
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self._flow_graph.update()
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self._update_size()
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def draw(self, widget, cr):
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width = widget.get_allocated_width()
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height = widget.get_allocated_height()
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cr.set_source_rgba(*FLOWGRAPH_BACKGROUND_COLOR)
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cr.rectangle(0, 0, width, height)
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cr.fill()
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cr.scale(self.zoom_factor, self.zoom_factor)
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cr.set_line_width(2.0 / self.zoom_factor)
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if self._update_after_zoom:
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self._flow_graph.create_labels(cr)
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self._flow_graph.create_shapes()
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self._update_size()
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self._update_after_zoom = False
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self._flow_graph.draw(cr)
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def _translate_event_coords(self, event):
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return event.x / self.zoom_factor, event.y / self.zoom_factor
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def _handle_focus_lost_event(self, widget, event):
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# don't clear selection while context menu is active
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if not self._flow_graph.context_menu.get_take_focus():
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self._flow_graph.unselect()
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self._flow_graph.update_selected()
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self._flow_graph.queue_draw()
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