def mouseMoveEvent(self, event: QGraphicsSceneMouseEvent):
if event.buttons() & Qt.LeftButton:
rect = QRectF(event.buttonDownPos(Qt.LeftButton),
event.pos()).normalized()
self.__selection_rect.setRect(rect)
self.__selection_rect.setVisible(True)
if rect.width():
self.select(None)
event.accept()
def mouseMoveEvent(self, event: QGraphicsSceneMouseEvent):
if event.buttons() & Qt.LeftButton:
if self._selection_rect is None:
self._selection_rect = ViolinItem.SelectionRect(
self, self._width, self._height)
x = event.buttonDownPos(Qt.LeftButton).x()
rect = QRectF(x, 0, event.pos().x() - x, self._height).normalized()
rect = rect.intersected(self.contentsRect())
self._selection_rect.setRect(rect)
event.accept()
def mousePressEvent(self, event: QGraphicsSceneMouseEvent):
if event.buttons() & Qt.LeftButton:
if event.modifiers() & Qt.ControlModifier:
self.__sel_action = self.SelectAction.Toggle
elif event.modifiers() & Qt.AltModifier:
self.__sel_action = self.SelectAction.Deselect
elif event.modifiers() & Qt.ShiftModifier:
self.__sel_action = self.SelectAction.Select
else:
self.__sel_action = self.SelectAction.ClearSelect
self.select(event.pos())
event.accept()