Qt/PyQt: QGraphicsItem vs. QGraphicsWidget geometry, position, mouse interaction - qt

Question

I am converting a larger program of QGraphicsItems to QGraphicsWidgets (let's call them item and widget for typing sake). Mouse hover fails now because the position and/or rect of the widgets are not the same as the old items. I've boiled down to a simple case with a view, scene, an item and a widget. The blue item renders at 100x50 pix, and hoverEnterEvent occurs as expected. However, the red widget is rendered at half intended width. I can fix this if I reimplement the pure virtual function boundingRect for the widget but the hover event is still only triggered atop the 50x50 left half. What pos/rect/geometry methods do I need to use/override to get the widget to interact properly with the mouse just like the item? Thanks. Here's my sample code
#!/usr/local/bin/python
import os, sys
from PyQt4.Qt import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class MyView(QGraphicsView):
def __init__(self):
QGraphicsView.__init__(self)
self.setWindowFlags(Qt.WindowStaysOnTopHint)
self.scene = QGraphicsScene(self)
self.item = GraphicsItem('item', 100, 50)
self.item.moveBy(50, 50)
self.scene.addItem(self.item)
self.widget = GraphicsWidget('widget', 100, 50)
self.scene.addItem(self.widget)
self.setScene(self.scene)
class GraphicsItem(QGraphicsItem):
def __init__(self, name, width, height):
QGraphicsItem.__init__(self)
self.setAcceptHoverEvents(True)
self.name = name
self.__width = width
self.__height = height
def boundingRect(self):
return QRectF(0, 0, self.__width, self.__height)
def hoverEnterEvent(self, event):
self.__printGeometryDetails()
def paint(self, painter, option, widget):
bgRect = self.boundingRect()
painter.drawRects(bgRect)
painter.fillRect(bgRect, QColor('blue'))
def __printGeometryDetails(self):
print self.name
print ' pos (%.0f, %0.0f)' % (self.pos().x(), self.pos().y())
print ' boundingRect (%.0f, %0.0f, %.0f, %0.0f)' % (self.boundingRect().x(), self.boundingRect().y(), self.boundingRect().width(), self.boundingRect().height())
class GraphicsWidget(QGraphicsWidget):
def __init__(self, name, width, height):
QGraphicsWidget.__init__(self)
self.setAcceptHoverEvents(True)
self.name = name
self.__width = width
self.__height = height
def boundingRect(self):
return QRectF(0, 0, self.__width, self.__height)
def hoverEnterEvent(self, event):
self.__printGeometryDetails()
def paint(self, painter, option, widget):
bgRect = self.boundingRect()
painter.drawRects(bgRect)
painter.fillRect(bgRect, QColor('red'))
def __printGeometryDetails(self):
print self.name
print ' pos (%.0f, %0.0f)' % (self.pos().x(), self.pos().y())
print ' boundingRect (%.0f, %0.0f, %.0f, %0.0f)' % (self.boundingRect().x(), self.boundingRect().y(), self.boundingRect().width(), self.boundingRect().height())
print ' geometry (%.0f, %0.0f, %.0f, %0.0f)' % (self.geometry().x(), self.geometry().y(), self.geometry().width(), self.geometry().height())
print ' rect (%.0f, %0.0f, %.0f, %0.0f)' % (self.rect().x(), self.rect().y(), self.rect().width(), self.rect().height())
if __name__ == '__main__':
app = QApplication(sys.argv)
view = MyView()
view.setGeometry(600, 100, 400, 370)
view.show()
sys.exit(app.exec_())

Answer 1

It does seem to work correctly if you use self.resize(width, height) instead of redefining boundingRect.