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