Revision: 5866
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=5866&view=rev
Author: pkienzle
Date: 2008-07-25 05:01:18 +0000 (Fri, 25 Jul 2008)
Log Message:
-----------
mouse wheel support for tk backend
Modified Paths:
--------------
trunk/matplotlib/lib/matplotlib/backends/backend_tkagg.py
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_tkagg.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_tkagg.py 2008-07-25
03:55:16 UTC (rev 5865)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_tkagg.py 2008-07-25
05:01:18 UTC (rev 5866)
@@ -164,10 +164,19 @@
self._tkcanvas.bind("<KeyRelease>", self.key_release)
for name in "<Button-1>", "<Button-2>", "<Button-3>":
self._tkcanvas.bind(name, self.button_press_event)
-
for name in "<ButtonRelease-1>", "<ButtonRelease-2>",
"<ButtonRelease-3>":
self._tkcanvas.bind(name, self.button_release_event)
+ # Mouse wheel on Linux generates button 4/5 events
+ for name in "<Button-4>", "<Button-5>":
+ self._tkcanvas.bind(name, self.scroll_event)
+ # Mouse wheel for windows goes to the window with the focus.
+ # Since the canvas won't usually have the focus, bind the
+ # event to the window containing the canvas instead.
+ # See http://wiki.tcl.tk/3893 (mousewheel) for details
+ root = self._tkcanvas.winfo_toplevel()
+ root.bind("<MouseWheel>", self.scroll_event_windows)
+
self._master = master
self._tkcanvas.focus_set()
@@ -265,6 +274,26 @@
FigureCanvasBase.button_release_event(self, x, y, num, guiEvent=event)
+ def scroll_event(self, event):
+ x = event.x
+ y = self.figure.bbox.height - event.y
+ num = getattr(event, 'num', None)
+ if num==4: step = -1
+ elif num==5: step = +1
+ else: step = 0
+
+ FigureCanvasBase.scroll_event(self, x, y, step, guiEvent=event)
+
+ def scroll_event_windows(self, event):
+ """MouseWheel event processor"""
+ # need to find the window that contains the mouse
+ w = event.widget.winfo_containing(event.x_root, event.y_root)
+ if w == self._tkcanvas:
+ x = event.x_root - w.winfo_rootx()
+ y = event.y_root - w.winfo_rooty()
+ step = event.delta/120.
+ FigureCanvasBase.scroll_event(self, x, y, step, guiEvent=event)
+
def _get_key(self, event):
val = event.keysym_num
if self.keyvald.has_key(val):
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