python - 带有 Svg 图像的 pyQt 悬停事件

Question

我已经为此工作了一段时间，但我不知道自己做错了什么。我希望这里有人可以提供帮助。

当我将鼠标悬停在 QGraphicsScene 中的 Svg 项目上时，我试图让悬停事件起作用。这是我一直在玩的代码。

#!/usr/bin/python

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4.QtSvg import *

class Main(QWidget):

    def __init__(self):
        super(Main, self).__init__()

        hbox = QHBoxLayout()

        self.setLayout(hbox)
        self.view = MyView(self)
        self.scene = QGraphicsScene()
        self.view.setScene(self.scene)

        hbox.addWidget(self.view)


class MyView(QGraphicsView):

    def __init__(self, parent):
        super(MyView, self).__init__(parent)
        self.parent = parent

    def mousePressEvent(self, event):
        super(MyView, self).mousePressEvent(event)
        test = MySvg()
        self.parent.scene.addItem(test.image)


class MySvg(QGraphicsSvgItem):

    def __init__(self):
        super(MySvg, self).__init__()

        self.image = QGraphicsSvgItem('ubuntu.svg')
        self.image.setFlags(QGraphicsItem.ItemIsSelectable|
                            QGraphicsItem.ItemIsMovable)

        self.setAcceptsHoverEvents(True)

    def hoverEnterEvent(self, event):
        print 'Enter'

    def hoverLeaveEvent(self, event):
        print 'Leave'

    def hoverMoveEvent(self, event):
        print 'Moving'


def runMain():

    app = QApplication(sys.argv)
    ex = Main()
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    runMain()

希望有人能帮忙。

Answer 1

您正在监视 MySvg 的悬停事件，但您正在将另一个 QGraphicsSvgItem 添加到只是一个实例的 View (MySvg.image)在 MySvg 中。您的 MySvg 甚至不在 View 中。像这样尝试:

#!/usr/bin/python

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4.QtSvg import *

class Main(QWidget):

    def __init__(self):
        super(Main, self).__init__()

        hbox = QHBoxLayout()

        self.setLayout(hbox)
        self.view = MyView(self)
        self.scene = QGraphicsScene()
        self.view.setScene(self.scene)

        hbox.addWidget(self.view)


class MyView(QGraphicsView):

    def __init__(self, parent):
        super(MyView, self).__init__(parent)
        self.parent = parent

    def mousePressEvent(self, event):
        super(MyView, self).mousePressEvent(event)
        test = MySvg()
        self.parent.scene.addItem(test)


class MySvg(QGraphicsSvgItem):

    def __init__(self):
        super(MySvg, self).__init__('ubuntu.svg')

        self.setFlags(QGraphicsItem.ItemIsSelectable|
                      QGraphicsItem.ItemIsMovable)

        self.setAcceptsHoverEvents(True)

    def hoverEnterEvent(self, event):
        print 'Enter'

    def hoverLeaveEvent(self, event):
        print 'Leave'

    def hoverMoveEvent(self, event):
        print 'Moving'


def runMain():

    app = QApplication(sys.argv)
    ex = Main()
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    runMain()