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

   1 """
   2 Copyright 2007 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
  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, main_window):
  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._main_window = main_window
  39                 #inject drawing area into main_window
  40                 self._main_window.drawing_area = self
  41                 gtk.DrawingArea.__init__(self)
  42                 self.set_size_request(MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT)
  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.set_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 the focus flag
  55                 self._focus_flag = False
  56                 self.get_focus_flag = lambda: self._focus_flag
  57                 self.connect("leave-notify-event", self._handle_focus_event, False)
  58                 self.connect("enter-notify-event", self._handle_focus_event, True)
  59                 #pixmap for drawing
  60                 self.pixmap = None
  61                 self.gc = None
  62
  63         def draw(self):
  64                 """
  65                 Draw the pixmap onto this drawing area.
  66                 """
  67                 self.window.draw_drawable(self.gc, self.pixmap, 0, 0, 0, 0, -1, -1)
  68
  69         ##########################################################################
  70         ## Handlers
  71         ##########################################################################
  72         def _handle_focus_event(self, widget, event, focus_flag):
  73                 """Record the focus state of the flow graph window."""
  74                 self._focus_flag = focus_flag
  75
  76         def _handle_mouse_button_press(self, widget, event):
  77                 """
  78                 Forward button click information to the flow graph.
  79                 """
  80                 self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
  81                 self._main_window.get_flow_graph().handle_mouse_button_press(
  82                         left_click=(event.button == 1),
  83                         double_click=(event.type == gtk.gdk._2BUTTON_PRESS),
  84                         coordinate=(event.x, event.y),
  85                 )
  86                 return True
  87
  88         def _handle_mouse_button_release(self, widget, event):
  89                 """
  90                 Forward button release information to the flow graph.
  91                 """
  92                 self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
  93                 self._main_window.get_flow_graph().handle_mouse_button_release(
  94                         left_click=(event.button == 1),
  95                         coordinate=(event.x, event.y),
  96                 )
  97                 return True
  98
  99         def _handle_mouse_motion(self, widget, event):
 100                 """
 101                 Forward mouse motion information to the flow graph.
 102                 """
 103                 self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
 104                 self._main_window.get_flow_graph().handle_mouse_motion(
 105                         coordinate=(event.x, event.y),
 106                 )
 107                 return True
 108
 109         def _handle_window_expose(self, widget, event):
 110                 """
 111                 Called when the window initially appears or is resized: create a new pixmap, draw the flow graph.
 112                 """
 113                 self.gc = self.window.new_gc()
 114                 width, height = self.get_size_request()
 115                 if not self.pixmap or (width, height) != self.pixmap.get_size():
 116                         self.pixmap = gtk.gdk.Pixmap(self.window, width, height, -1)
 117                 self._main_window.get_flow_graph().draw()
 118                 return True