First pass at implementing the diff from PR307

pyqtgraph/GraphicsScene/GraphicsScene.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import time
 import weakref
 import warnings
 
@@ -8,6 +9,9 @@ from .. import functions as fn
 from .. import ptime as ptime
 from .mouseEvents import *
 from .. import debug as debug
+from .. import getConfigOption
+
+getMillis = lambda: int(round(time.time() * 1000))
 
 
 if hasattr(QtCore, 'PYQT_VERSION'):
@@ -114,6 +118,7 @@ class GraphicsScene(QtGui.QGraphicsScene):
         self.contextMenu[0].triggered.connect(self.showExportDialog)
         
         self.exportDialog = None
+        self._lastMoveEventTime = 0
         
     def render(self, *args):
         self.prepareForPaint()
@@ -162,16 +167,33 @@ class GraphicsScene(QtGui.QGraphicsScene):
                     i.setFocus(QtCore.Qt.MouseFocusReason)
                     break
 
+    def _moveEventIsAllowed(self):
+        # For ignoring events that are too close together
+        
+        # Max number of events per second
+        rateLimit = getConfigOption('mouseRateLimit')
+        if rateLimit <= 0:
+            return True
+        
+        # Delay between events (in milliseconds)
+        delay = 1000.0 / rateLimit
+        if getMillis() - self._lastMoveEventTime >= delay:
+            return True
+        return False
+
+        
     def mouseMoveEvent(self, ev):
+        # ignore high frequency events
+        if self._moveEventIsAllowed():
+            self._lastMoveEventTime = getMillis()
             self.sigMouseMoved.emit(ev.scenePos())
 
-        ## First allow QGraphicsScene to deliver hoverEnter/Move/ExitEvents
+            # First allow QGraphicsScene to eliver hoverEvent/Move/Exit Events
             QtGui.QGraphicsScene.mouseMoveEvent(self, ev)
-        
+            # Next Deliver our own Hover Events
-        ## Next deliver our own HoverEvents
             self.sendHoverEvents(ev)
-        
+            if int(ev.buttons()) != 0:
-        if int(ev.buttons()) != 0:  ## button is pressed; send mouseMoveEvents and mouseDragEvents
+                # button is pressed' send mouseMoveEvents and mouseDragEvents
                 QtGui.QGraphicsScene.mouseMoveEvent(self, ev)
                 if self.mouseGrabberItem() is None:
                     now = ptime.time()
@@ -189,12 +211,16 @@ class GraphicsScene(QtGui.QGraphicsScene):
                                     continue
                                 init = init or (len(self.dragButtons) == 0)  ## If this is the first button to be dragged, then init=True
                                 self.dragButtons.append(int(btn))
-                        
+                    ## if we have dragged buttons, deliver a drag event
-                ## If we have dragged buttons, deliver a drag event
                     if len(self.dragButtons) > 0:
                         if self.sendDragEvent(ev, init=init):
                             ev.accept()
 
+        else:
+            QtGui.QGraphicsScene.mouseMoveEvent(self, ev)
+            # if you do not accept event (which is ignored) then cursor will disappear
+            ev.accept()
+                
     def leaveEvent(self, ev):  ## inform items that mouse is gone
         if len(self.dragButtons) == 0:
             self.sendHoverEvents(ev, exitOnly=True)

pyqtgraph/__init__.py

@@ -56,6 +56,7 @@ CONFIG_OPTIONS = {
     'exitCleanup': True,    ## Attempt to work around some exit crash bugs in PyQt and PySide
     'enableExperimental': False, ## Enable experimental features (the curious can search for this key in the code)
     'crashWarning': False,  # If True, print warnings about situations that may result in a crash
+    'mouseRateLimit': 100,  # For ignoring frequent mouse events, max number of mouse move events per second, if <= 0, then it is switched off
     'imageAxisOrder': 'col-major',  # For 'row-major', image data is expected in the standard (row, col) order.
                                  # For 'col-major', image data is expected in reversed (col, row) order.
                                  # The default is 'col-major' for backward compatibility, but this may

pyqtgraph/graphicsItems/tests/test_InfiniteLine.py

@@ -5,6 +5,9 @@ pg.mkQApp()
 
 
 def test_InfiniteLine():
+    # disable delay of mouse move events because events is called immediately in test
+    pg.setConfigOption('mouseRateLimit', -1)
+
     # Test basic InfiniteLine API
     plt = pg.plot()
     plt.setXRange(-10, 10)