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  1. Qt
  2. QTBUG-89378

containmentMask documentation should make it clearer that a QtObject can be used

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      The only requirement for https://doc.qt.io/qt-5/qml-qtquick-item.html#containmentMask-prop is that it is a QObject-derived type with an invokable contains(QPointF) function. This means that QtObject can also be used, not just Item. The documentation should be clearer about this by providing an example that uses QtObject. Even more important is the fact that type annotations are required on the function in order for QMetaObject to recognise it:

      import QtQml
import QtQuick

Window {
    id: window
    visible: true
    width: 640
    height: 480

    Rectangle {
        id: control
        width: 10
        height: 100
        color: tapHandler.pressed ? Qt.darker("#444") : (hoverHandler.hovered ? Qt.lighter("#444") : "#444")
        anchors.centerIn: parent

        TapHandler {
            id: tapHandler
        }
        HoverHandler {
            id: hoverHandler
        }

        containmentMask: QtObject {
            id: mask
            function contains(point: point) : bool {
                let size = 30
                let bounds = Qt.rect((control.width - size) / 2, 0, size, control.height)
                print("hello", point, bounds)
                return point.x >= bounds.x
                    && point.x < bounds.x + bounds.width
                    && point.y >= bounds.y
                    && point.y < bounds.y + bounds.height
            }
        }
    }
}

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            docteam Qt Documentation Team
            mitch_curtis Mitch Curtis
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              Created:
              Updated:
              Resolved:

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