git.gag.com Git - debian/gnuradio/blob - grc/gui/DrawingArea.py

   1 """
   2 Copyright 2007, 2008, 2009 Free Software Foundation, Inc.
   3 This file is part of GNU Radio
   4
   5 GNU Radio Companion is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 GNU Radio Companion is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18 """
  19
  20 import pygtk
  21 pygtk.require('2.0')
  22 import gtk
  23 from Constants import MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT, DND_TARGETS
  24
  25 class DrawingArea(gtk.DrawingArea):
  26         """
  27         DrawingArea is the gtk pixel map that graphical elements may draw themselves on.
  28         The drawing area also responds to mouse and key events.
  29         """
  30
  31         def __init__(self, flow_graph):
  32                 """
  33                 DrawingArea contructor.
  34                 Connect event handlers.
  35                 @param main_window the main_window containing all flow graphs
  36                 """
  37                 self.ctrl_mask = False
  38                 self._flow_graph = flow_graph
  39                 gtk.DrawingArea.__init__(self)
  40                 self.set_size_request(MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT)
  41                 self.connect('realize', self._handle_window_realize)
  42                 self.connect('configure-event', self._handle_window_configure)
  43                 self.connect('expose-event', self._handle_window_expose)
  44                 self.connect('motion-notify-event', self._handle_mouse_motion)
  45                 self.connect('button-press-event', self._handle_mouse_button_press)
  46                 self.connect('button-release-event', self._handle_mouse_button_release)
  47                 self.add_events(
  48                         gtk.gdk.BUTTON_PRESS_MASK | \
  49                         gtk.gdk.POINTER_MOTION_MASK | \
  50                         gtk.gdk.BUTTON_RELEASE_MASK | \
  51                         gtk.gdk.LEAVE_NOTIFY_MASK | \
  52                         gtk.gdk.ENTER_NOTIFY_MASK
  53                 )
  54                 #setup drag and drop
  55                 self.drag_dest_set(gtk.DEST_DEFAULT_ALL, DND_TARGETS, gtk.gdk.ACTION_COPY)
  56                 self.connect('drag-data-received', self._handle_drag_data_received)
  57                 #setup the focus flag
  58                 self._focus_flag = False
  59                 self.get_focus_flag = lambda: self._focus_flag
  60                 def _handle_focus_event(widget, event, focus_flag): self._focus_flag = focus_flag
  61                 self.connect('leave-notify-event', _handle_focus_event, False)
  62                 self.connect('enter-notify-event', _handle_focus_event, True)
  63
  64         def new_pixmap(self, width, height): return gtk.gdk.Pixmap(self.window, width, height, -1)
  65
  66         ##########################################################################
  67         ## Handlers
  68         ##########################################################################
  69         def _handle_drag_data_received(self, widget, drag_context, x, y, selection_data, info, time):
  70                 """
  71                 Handle a drag and drop by adding a block at the given coordinate.
  72                 """
  73                 self._flow_graph.add_new_block(selection_data.data, (x, y))
  74
  75         def _handle_mouse_button_press(self, widget, event):
  76                 """
  77                 Forward button click information to the flow graph.
  78                 """
  79                 self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
  80                 self._flow_graph.handle_mouse_button_press(
  81                         left_click=(event.button == 1),
  82                         double_click=(event.type == gtk.gdk._2BUTTON_PRESS),
  83                         coordinate=(event.x, event.y),
  84                 )
  85
  86         def _handle_mouse_button_release(self, widget, event):
  87                 """
  88                 Forward button release information to the flow graph.
  89                 """
  90                 self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
  91                 self._flow_graph.handle_mouse_button_release(
  92                         left_click=(event.button == 1),
  93                         coordinate=(event.x, event.y),
  94                 )
  95
  96         def _handle_mouse_motion(self, widget, event):
  97                 """
  98                 Forward mouse motion information to the flow graph.
  99                 """
 100                 self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
 101                 self._flow_graph.handle_mouse_motion(
 102                         coordinate=(event.x, event.y),
 103                 )
 104
 105         def _handle_window_realize(self, widget):
 106                 """
 107                 Called when the window is realized.
 108                 Update the flowgraph, which calls new pixmap.
 109                 """
 110                 self._flow_graph.update()
 111
 112         def _handle_window_configure(self, widget, event):
 113                 """
 114                 Called when the window is resized.
 115                 Create a new pixmap for background buffer.
 116                 """
 117                 self._pixmap = self.new_pixmap(*self.get_size_request())
 118
 119         def _handle_window_expose(self, widget, event):
 120                 """
 121                 Called when window is exposed, or queue_draw is called.
 122                 Double buffering: draw to pixmap, then draw pixmap to window.
 123                 """
 124                 gc = self.window.new_gc()
 125                 self._flow_graph.draw(gc, self._pixmap)
 126                 self.window.draw_drawable(gc, self._pixmap, 0, 0, 0, 0, -1, -1)