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"""
Copyright 2007 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
GNU Radio Companion is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
import pygtk
pygtk.require('2.0')
import gtk
from Constants import MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT
class DrawingArea(gtk.DrawingArea):
"""
DrawingArea is the gtk pixel map that graphical elements may draw themselves on.
The drawing area also responds to mouse and key events.
"""
def __init__(self, main_window):
"""
DrawingArea contructor.
Connect event handlers.
@param main_window the main_window containing all flow graphs
"""
self.ctrl_mask = False
self._main_window = main_window
#inject drawing area into main_window
self._main_window.drawing_area = self
gtk.DrawingArea.__init__(self)
self.set_size_request(MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT)
self.connect('expose-event', self._handle_window_expose)
self.connect('motion-notify-event', self._handle_mouse_motion)
self.connect('button-press-event', self._handle_mouse_button_press)
self.connect('button-release-event', self._handle_mouse_button_release)
self.set_events(
gtk.gdk.BUTTON_PRESS_MASK | \
gtk.gdk.POINTER_MOTION_MASK | \
gtk.gdk.BUTTON_RELEASE_MASK | \
gtk.gdk.LEAVE_NOTIFY_MASK | \
gtk.gdk.ENTER_NOTIFY_MASK
)
#setup the focus flag
self._focus_flag = False
self.get_focus_flag = lambda: self._focus_flag
self.connect("leave-notify-event", self._handle_focus_event, False)
self.connect("enter-notify-event", self._handle_focus_event, True)
#pixmap for drawing
self.pixmap = None
self.gc = None
def draw(self):
"""
Draw the pixmap onto this drawing area.
"""
self.window.draw_drawable(self.gc, self.pixmap, 0, 0, 0, 0, -1, -1)
##########################################################################
## Handlers
##########################################################################
def _handle_focus_event(self, widget, event, focus_flag):
"""Record the focus state of the flow graph window."""
self._focus_flag = focus_flag
def _handle_mouse_button_press(self, widget, event):
"""
Forward button click information to the flow graph.
"""
self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
self._main_window.get_flow_graph().handle_mouse_button_press(
left_click=(event.button == 1),
double_click=(event.type == gtk.gdk._2BUTTON_PRESS),
coordinate=(event.x, event.y),
)
return True
def _handle_mouse_button_release(self, widget, event):
"""
Forward button release information to the flow graph.
"""
self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
self._main_window.get_flow_graph().handle_mouse_button_release(
left_click=(event.button == 1),
coordinate=(event.x, event.y),
)
return True
def _handle_mouse_motion(self, widget, event):
"""
Forward mouse motion information to the flow graph.
"""
self.ctrl_mask = event.state & gtk.gdk.CONTROL_MASK
self._main_window.get_flow_graph().handle_mouse_motion(
coordinate=(event.x, event.y),
)
return True
def _handle_window_expose(self, widget, event):
"""
Called when the window initially appears or is resized: create a new pixmap, draw the flow graph.
"""
self.gc = self.window.new_gc()
width, height = self.get_size_request()
if not self.pixmap or (width, height) != self.pixmap.get_size():
self.pixmap = gtk.gdk.Pixmap(self.window, width, height, -1)
self._main_window.get_flow_graph().draw()
return True
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