Override ViewBox.popup() to update menu before showing

Extend ViewBox menu in examples/contextMenu

examples/contextMenu.py

@@ -0,0 +1,142 @@
+# -*- coding: utf-8 -*-
+"""
+Demonstrates adding a custom context menu to a GraphicsItem
+and extending the context menu of a ViewBox.
+
+PyQtGraph implements a system that allows each item in a scene to implement its 
+own context menu, and for the menus of its parent items to be automatically 
+displayed as well. 
+
+"""
+import initExample ## Add path to library (just for examples; you do not need this)
+
+import pyqtgraph as pg
+from pyqtgraph.Qt import QtCore, QtGui
+import numpy as np
+
+win = pg.GraphicsWindow()
+win.setWindowTitle('pyqtgraph example: context menu')
+
+
+view = win.addViewBox()
+
+# add two new actions to the ViewBox context menu:
+zoom1 = view.menu.addAction('Zoom to box 1')
+zoom2 = view.menu.addAction('Zoom to box 2')
+
+# define callbacks for these actions
+def zoomTo1():
+    # note that box1 is defined below
+    view.autoRange(items=[box1])
+zoom1.triggered.connect(zoomTo1)
+
+def zoomTo2():
+    # note that box1 is defined below
+    view.autoRange(items=[box2])
+zoom2.triggered.connect(zoomTo2)
+
+
+
+class MenuBox(pg.GraphicsObject):
+    """
+    This class draws a rectangular area. Right-clicking inside the area will
+    raise a custom context menu which also includes the context menus of
+    its parents.    
+    """
+    def __init__(self, name):
+        self.name = name
+        self.pen = pg.mkPen('r')
+        
+        # menu creation is deferred because it is expensive and often
+        # the user will never see the menu anyway.
+        self.menu = None
+        
+        # note that the use of super() is often avoided because Qt does not 
+        # allow to inherit from multiple QObject subclasses.
+        pg.GraphicsObject.__init__(self) 
+
+    
+    # All graphics items must have paint() and boundingRect() defined.
+    def boundingRect(self):
+        return QtCore.QRectF(0, 0, 10, 10)
+    
+    def paint(self, p, *args):
+        p.setPen(self.pen)
+        p.drawRect(self.boundingRect())
+    
+    
+    # On right-click, raise the context menu
+    def mouseClickEvent(self, ev):
+        if ev.button() == QtCore.Qt.RightButton:
+            if self.raiseContextMenu(ev):
+                ev.accept()
+
+    def raiseContextMenu(self, ev):
+        menu = self.getContextMenus()
+        
+        # Let the scene add on to the end of our context menu
+        # (this is optional)
+        menu = self.scene().addParentContextMenus(self, menu, ev)
+        
+        pos = ev.screenPos()
+        menu.popup(QtCore.QPoint(pos.x(), pos.y()))
+        return True
+
+    # This method will be called when this item's _children_ want to raise
+    # a context menu that includes their parents' menus.
+    def getContextMenus(self, event=None):
+        if self.menu is None:
+            self.menu = QtGui.QMenu()
+            self.menu.setTitle(self.name+ " options..")
+            
+            green = QtGui.QAction("Turn green", self.menu)
+            green.triggered.connect(self.setGreen)
+            self.menu.addAction(green)
+            self.menu.green = green
+            
+            blue = QtGui.QAction("Turn blue", self.menu)
+            blue.triggered.connect(self.setBlue)
+            self.menu.addAction(blue)
+            self.menu.green = blue
+            
+            alpha = QtGui.QWidgetAction(self.menu)
+            alphaSlider = QtGui.QSlider()
+            alphaSlider.setOrientation(QtCore.Qt.Horizontal)
+            alphaSlider.setMaximum(255)
+            alphaSlider.setValue(255)
+            alphaSlider.valueChanged.connect(self.setAlpha)
+            alpha.setDefaultWidget(alphaSlider)
+            self.menu.addAction(alpha)
+            self.menu.alpha = alpha
+            self.menu.alphaSlider = alphaSlider
+        return self.menu
+
+    # Define context menu callbacks
+    def setGreen(self):
+        self.pen = pg.mkPen('g')
+        # inform Qt that this item must be redrawn.
+        self.update()
+
+    def setBlue(self):
+        self.pen = pg.mkPen('b')
+        self.update()
+
+    def setAlpha(self, a):
+        self.setOpacity(a/255.)
+
+
+# This box's context menu will include the ViewBox's menu
+box1 = MenuBox("Menu Box #1")
+view.addItem(box1)
+
+# This box's context menu will include both the ViewBox's menu and box1's menu
+box2 = MenuBox("Menu Box #2")
+box2.setParentItem(box1)
+box2.setPos(5, 5)
+box2.scale(0.2, 0.2)
+
+## Start Qt event loop unless running in interactive mode or using pyside.
+if __name__ == '__main__':
+    import sys
+    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+        QtGui.QApplication.instance().exec_()

pyqtgraph/graphicsItems/ViewBox/ViewBoxMenu.py

@@ -88,15 +88,15 @@ class ViewBoxMenu(QtGui.QMenu):
         
         self.updateState()
 
-    def copy(self):
-        m = QtGui.QMenu()
-        for sm in self.subMenus():
-            if isinstance(sm, QtGui.QMenu):
-                m.addMenu(sm)
-            else:
-                m.addAction(sm)
-        m.setTitle(self.title())
-        return m
+    #def copy(self):
+        #m = QtGui.QMenu()
+        #for sm in self.subMenus():
+            #if isinstance(sm, QtGui.QMenu):
+                #m.addMenu(sm)
+            #else:
+                #m.addAction(sm)
+        #m.setTitle(self.title())
+        #return m
 
     def subMenus(self):
         if not self.valid:
@@ -159,6 +159,10 @@ class ViewBoxMenu(QtGui.QMenu):
         self.ctrl[1].invertCheck.setChecked(state['yInverted'])
         self.valid = True
         
+    def popup(self, *args):
+        if not self.valid:
+            self.updateState()
+        QtGui.QMenu.popup(self, *args)
         
     def autoRange(self):
         self.view().autoRange()  ## don't let signal call this directly--it'll add an unwanted argument