Revision: 8252
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=8252&view=rev
Author: ryanmay
Date: 2010-04-20 19:42:05 +0000 (Tue, 20 Apr 2010)
Log Message:
-----------
Add TimerQT and new_timer() method.
Modified Paths:
--------------
trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py 2010-04-20
19:41:38 UTC (rev 8251)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_qt4.py 2010-04-20
19:42:05 UTC (rev 8252)
@@ -7,7 +7,8 @@
from matplotlib import verbose
from matplotlib.cbook import is_string_like, onetrue
from matplotlib.backend_bases import RendererBase, GraphicsContextBase, \
- FigureManagerBase, FigureCanvasBase, NavigationToolbar2, IdleEvent,
cursors
+ FigureManagerBase, FigureCanvasBase, NavigationToolbar2, IdleEvent, \
+ cursors, TimerBase
from matplotlib._pylab_helpers import Gcf
from matplotlib.figure import Figure
from matplotlib.mathtext import MathTextParser
@@ -83,6 +84,46 @@
return manager
+class TimerQT(TimerBase):
+ '''
+ Subclass of :class:`backend_bases.TimerBase` that uses Qt4 timer events.
+
+ Attributes:
+ * interval: The time between timer events in milliseconds. Default
+ is 1000 ms.
+ * single_shot: Boolean flag indicating whether this timer should
+ operate as single shot (run once and then stop). Defaults to False.
+ * callbacks: Stores list of (func, args) tuples that will be called
+ upon timer events. This list can be manipulated directly, or the
+ functions add_callback and remove_callback can be used.
+ '''
+ def __init__(self):
+ from PyQt4.QtCore import QObject, SIGNAL, QTimer
+ TimerBase.__init__(self)
+
+ # Create a new timer and connect the timeout() signal to the
+ # _on_timer method.
+ self._timer = QTimer()
+ QObject.connect(self._timer, SIGNAL('timeout()'), self._on_timer)
+
+ def __del__(self):
+ # Probably not necessary in practice, but is good behavior to
disconnect
+ TimerBase.__del__(self)
+ QObject.disconnect(self._timer , SIGNAL('timeout()'), self._on_timer)
+
+ def _timer_set_single_shot(self):
+ self._timer.setSingleShot(self._single)
+
+ def _timer_set_interval(self):
+ self._timer.setInterval(self._interval)
+
+ def _timer_start(self):
+ self._timer.start()
+
+ def _timer_stop(self):
+ self._timer.stop()
+
+
class FigureCanvasQT( QtGui.QWidget, FigureCanvasBase ):
keyvald = { QtCore.Qt.Key_Control : 'control',
QtCore.Qt.Key_Shift : 'shift',
@@ -190,6 +231,14 @@
return key
+ def new_timer(self):
+ """
+ Creates a new backend-specific subclass of
+ :class:`backend_bases.TimerBase`. This is useful for getting periodic
+ events through the backend's native event loop.
+ """
+ return TimerQT()
+
def flush_events(self):
Qt.qApp.processEvents()
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