qt-everywhere-src-5.15.1/qtdeclarative/tests/manual/pointer/pinchDragFlingMPTA.qml

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import QtQuick 2.12
import "content"

Rectangle {
    width: 1024; height: 600
    color: "beige"
    objectName: "beige root"

    function getTransformationDetails(item, pinchhandler) {
        return "scale:" + pinchhandler.scale.toFixed(2)
                + " rotation:" + pinchhandler.rotation.toFixed(2)
                + " translation:" + "(" + pinchhandler.translation.x.toFixed(2) + "," + pinchhandler.translation.y.toFixed(2) + ")"
    }

    Rectangle {
        id: container
        objectName: "container rect"
        width: 600
        height: 500
        color: pinch3.active ? "red" : "black"
        antialiasing: true
        Loader {
            source: "../touch/mpta-crosshairs.qml"
            anchors.fill: parent
            anchors.margins: 2
        }
        Item {
            anchors.fill: parent
            // In order for PinchHandler to get a chance to take a passive grab, it has to get the touchpoints first.
            // In order to get the touchpoints first, it has to be on top of the Z order: i.e. come last in paintOrderChildItems().
            // This is the opposite situation as with filtersChildMouseEvents: e.g. PinchArea would have wanted to be the parent,
            // if it even knew that trick (which it doesn't).
            PinchHandler {
                id: pinch3
                objectName: "3-finger pinch"
                target: container
                minimumPointCount: 3
                minimumScale: 0.1
                maximumScale: 10
                onActiveChanged: if (!active) fling.restart(centroid.velocity)
            }
            DragHandler {
                id: dragHandler
                objectName: "DragHandler"
                target: container
                acceptedModifiers: Qt.MetaModifier
                onActiveChanged: if (!active) fling.restart(point.velocity)
            }
        }
        MomentumAnimation { id: fling; target: container }
    }
    Text {
        anchors.bottom: parent.bottom
        text: pinch3.active ? getTransformationDetails(container, pinch3) :
            "Pinch with 3 fingers to scale, rotate and translate\nHold down Meta to drag with one finger or mouse"
    }
}