Changeset f193585 in sasview for guitools/canvas.py

Timestamp:

Apr 28, 2008 5:48:59 PM (16 years ago)

Author:

Gervaise Alina <gervyh@…>

Branches:

master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, release_4.0.1, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload

Children:

6ed101a

Parents:

9e8dc22

Message:

some changes

File:

• guitools/canvas.py (modified) (4 diffs)

guitools/canvas.py

@@ -2 +2 @@
 from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg, _convert_agg_to_wx_bitmap
 from matplotlib.backends.backend_agg import FigureCanvasAgg
+from matplotlib.backend_bases import MouseEvent
 
 class FigureCanvas(FigureCanvasWxAgg):
@@ -19 +20 @@
         # doesn't behave as nicely.
         self.idletimer = wx.CallLater(1,self._onDrawIdle)
+        # Support for mouse wheel
+        self.Bind(wx.EVT_MOUSEWHEEL, self._onMouseWheel)
+
 
     def draw_idle(self, *args, **kwargs):
@@ -46 +50 @@
         else:
             self._isRendered = False
+    def _onMouseWheel(self, evt):
+        """Translate mouse wheel events into matplotlib events"""
+        # Determine mouse location
+        x = evt.GetX()
+        y = self.figure.bbox.height - evt.GetY()
+
+        # Convert delta/rotation/rate into a floating point step size
+        delta = evt.GetWheelDelta()
+        rotation = evt.GetWheelRotation()
+        rate = evt.GetLinesPerAction()
+        #print "delta,rotation,rate",delta,rotation,rate
+        step = rate*float(rotation)/delta
+
+        # Convert to mpl event
+        evt.Skip()
+        self.scroll_event(x, y, step, guiEvent=evt)
+
+    def scroll_event(self, x, y, step=1, guiEvent=None):
+        """
+        Backend derived classes should call this function on any
+        scroll wheel event.  x,y are the canvas coords: 0,0 is lower,
+        left.  button and key are as defined in MouseEvent
+        """
+        button = 'up' if step >= 0 else 'down'
+        self._button = button
+        s = 'scroll_event'
+        event = MouseEvent(s, self, x, y, button, self._key, guiEvent=guiEvent)
+        setattr(event,'step',step)
+        self.callbacks.process(s, event)
+
 
     def _onPaint(self, evt):
@@ -64 +98 @@
 
         evt.Skip()
-
+