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PyQtGraph: prevent QScrollArea scrolling when panning plot

In PyQtGraph you can zoom into the plots with the scroll wheel. However, when embedding PyQtGraph inside a QScrollArea, scrolling both zooms into the hovered plot AND scrolls the QScrollArea.

Example GIF

Minimal reproducable code:

from PyQt5.QtWidgets import QApplication, QScrollArea, QMainWindow
import pyqtgraph as pg

app = QApplication([])
window = QMainWindow()
scroll = QScrollArea(window)
window.setCentralWidget(scroll)

frame = pg.GraphicsLayoutWidget()
plot = frame.addPlot().plot([1,2,3], [2,5,10])

scroll.setWidget(frame)
scroll.setWidgetResizable(True)

frame.setFixedHeight(600)
window.setFixedHeight(500)
window.show()
app.exec_()

I tried googling the issue, and I found a way to stop panning and allow scrolling, however I want it the other way around: prevent scrolling and allow panning.

Is it possible inside PyQtGraph to stop QScrollArea scrolling when a plot is hovered?

Solution

  • The solution is to cancel the wheelEvent of QScrollArea:

    from PyQt5.QtWidgets import QApplication, QScrollArea, QMainWindow
import pyqtgraph as pg


class ScrollArea(QScrollArea):
    def wheelEvent(self, event):
        pass


if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)
    window = QMainWindow()
    scroll = ScrollArea(window)
    window.setCentralWidget(scroll)

    frame = pg.GraphicsLayoutWidget()
    plot = frame.addPlot().plot([1, 2, 3], [2, 5, 10])

    scroll.setWidget(frame)
    scroll.setWidgetResizable(True)

    frame.setFixedHeight(600)
    window.setFixedHeight(500)
    window.show()
    sys.exit(app.exec_())