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# Copyright (C) 2024 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtWidgets import QGesture, QGestureEvent
from PySide6.QtCore import Qt, QEvent
from PySide6.QtCharts import QChart
class Chart(QChart):
def __init__(self,
ChartType=QChart.ChartType.ChartTypeCartesian,
QGraphicsItem=None,
WindowType=Qt.WindowFlags):
super().__init__()
self.grabGesture(Qt.PanGesture)
self.grabGesture(Qt.PinchGesture)
def sceneEvent(self, event: QEvent):
if event.type() == QEvent.Gesture:
return self.gestureEvent(event)
return super().sceneEvent(event)
def gestureEvent(self, event: QGestureEvent):
if gesture := event.gesture(Qt.PanGesture):
pan = gesture
self.scroll(-pan.delta().x(), pan.delta().y())
if gesture := event.gesture(Qt.PinchGesture):
pinch = gesture
if pinch.changeFlags() & QGesture.QPinchGesture.ScaleFactorChanged:
self.zoom(pinch.scaleFactor())
return True
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