SF.net SVN: matplotlib:[7155] trunk/matplotlib

[<ds...@us...>]

Revision: 7155
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=7155&view=rev
Author:   dsdale
Date:     2009-05-28 16:11:16 +0000 (Thu, 28 May 2009)

Log Message:
-----------
handle scroll wheel events in Qt4 backend

Modified Paths:
--------------
    trunk/matplotlib/CHANGELOG
    trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py

Modified: trunk/matplotlib/CHANGELOG
===================================================================
--- trunk/matplotlib/CHANGELOG	2009-05-28 15:59:12 UTC (rev 7154)
+++ trunk/matplotlib/CHANGELOG	2009-05-28 16:11:16 UTC (rev 7155)
@@ -1,3 +1,6 @@
+2009-05-28 Applied fbianco's patch to handle scroll wheel events in 
+           the qt4 backend - DSD
+
 2009-05-26 Add support for "axis spines" to have arbitrary location. -ADS
 
 2009-05-20 Add an empty matplotlibrc to the tests/ directory so that running

Modified: trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py	2009-05-28 15:59:12 UTC (rev 7154)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py	2009-05-28 16:11:16 UTC (rev 7155)
@@ -136,6 +136,16 @@
         FigureCanvasBase.button_release_event( self, x, y, button )
         if DEBUG: print 'button released'
 
+    def wheelEvent( self, event ):
+        x = event.x()
+        # flipy so y=0 is bottom of canvas
+        y = self.figure.bbox.height - event.y()
+        # from QWheelEvent::delta doc
+        steps = event.delta()/120
+        if (event.orientation() == Qt.Qt.Vertical):
+            FigureCanvasBase.scroll_event( self, x, y, steps)
+            if DEBUG: print 'scroll event : delta = %i, steps = %i ' % (event.delta(),steps)
+
     def keyPressEvent( self, event ):
         key = self._get_key( event )
         FigureCanvasBase.key_press_event( self, key )


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