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我想要一个QWidget,它有可能在它内部进行平移和缩放。平移和缩放所有QWidget儿童
场景:
- 当用户使用鼠标了中间的按钮,滚动向上/向下,所有的孩子都从窗口小部件的中心缩放。
- 如果用户按住Alt键并同时按下鼠标中键,则所有孩子都会使用鼠标所做的距离进行翻译。
这个想法是通过继承另一个子类来创建一个新的QWidget。所以,我的QGraphicsView使它的例子:
UPDATE:
class MyQGraphicsView(QGraphicsView):
def __init__(self):
QGraphicsView.__init__(self)
self.setFocusPolicy(Qt.WheelFocus)
self.setRenderHints(QPainter.Antialiasing)
self.altPressed = False
self.middlePressed = False
self.rightPressed = False
def wheelEvent(self, event):
self.newScale(event.delta(), 1.15)
def keyPressEvent(self, event):
if event.key() == Qt.Key_Alt:
self.altPressed = True
QApplication.setOverrideCursor(Qt.OpenHandCursor)
def keyReleaseEvent(self, event):
if event.key() == Qt.Key_Alt:
self.altPressed = False
QApplication.setOverrideCursor(Qt.ArrowCursor)
def mousePressEvent(self, event):
self._dragPos = event.pos()
if event.button() == Qt.MidButton:
self.middlePressed = True
if event.button() == Qt.RightButton:
self.rightPressed = True
def mouseReleaseEvent(self, event):
if event.button() == Qt.MidButton:
self.middlePressed = False
if event.button() == Qt.RightButton:
self.rightPressed = False
def mouseMoveEvent(self, event):
if self.altPressed:
newPos = event.pos()
if self.middlePressed:
diff = newPos - self._dragPos
self._dragPos = newPos
QApplication.setOverrideCursor(Qt.ClosedHandCursor)
self.horizontalScrollBar().setValue(self.horizontalScrollBar().value() - diff.x())
self.verticalScrollBar().setValue(self.verticalScrollBar().value() - diff.y())
event.accept()
if self.rightPressed:
diff = newPos - self._dragPos
self._dragPos = newPos
QApplication.setOverrideCursor(Qt.SizeAllCursor)
self.newScale(diff.x(), 1.01)
def newScale(self, operator, factor):
if operator > 0:
self.scale(factor, factor)
if operator < 0:
self.scale(1.0/factor, 1.0/factor)
,当我使用这样的此类工作正常平移和缩放,但是:
view = MyQGraphicsView()
scene = QGraphicsScene()
view.setScene(scene)
view.setSceneRect(0, 0, 1000, 1000)
button = QPushButton('Hello !')
button.clicked.connect(self.sayHello)
scene.addWidget(button)
我不能点击按钮。我该如何解决它?
也看到http://stackoverflow.com/questions/19113532/qgraphicsview-zooming-in-and-out - 下层 - - 小鼠位置使用鼠标轮 – Trilarion