Question

似乎没有简单的方法可以做到这一点

例如：

Window {
    id: window
    width: 480
    height: 640

    MouseArea {
        anchors.fill: parent
        onClicked: console.debug("MouseArea Clicked !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
        preventStealing: true
    }

    TwoFingerArea {
        anchors.fill: parent

        enabled: true
        dragEnabled: true

        onZoomIn: console.debug("ZoomIn")
        onZoomOut:  console.debug("ZoomOut")
        onDragLeft: console.debug("DragLeft")
        onDragRight: console.debug("DragRight")
        onDragUp: console.debug("DragUp")
        onDragDown: console.debug("DragDown")
    }
}

TwoFingerArea：

MultiPointTouchArea {
    id: touch
    minimumTouchPoints: 2
    maximumTouchPoints: 2

    property var startPoint
    property var startScale
    property bool gestureDone: false
    property bool dragEnabled: true
    property int threshold: width / 12

    function dist(point1, point2) { return Math.sqrt(Math.pow(point1.x - point2.x, 2) + Math.pow(point1.y - point2.y, 2)) }
    function centerOf(point1, point2) { return Qt.point((point1.x + point2.x) / 2, (point1.y + point2.y) / 2) }

    signal zoomIn
    signal zoomOut
    signal dragLeft
    signal dragRight
    signal dragUp
    signal dragDown

    onPressed: {
        if (touchPoints.length === 2) {
            startPoint = centerOf(touchPoints[0], touchPoints[1])
            startScale = dist(touchPoints[0], touchPoints[1])
            gestureDone = false
        }
    }

    onTouchUpdated: {
        console.debug(touchPoints.length)
        if (touchPoints.length === 2 && !gestureDone) {
            var center = centerOf(touchPoints[0], touchPoints[1])
            var distance = dist(center, startPoint)
            var scale = dist(touchPoints[0], touchPoints[1])

            if      (scale - startScale > threshold) { zoomIn(); gestureDone = true }
            else if (scale - startScale < -threshold) { zoomOut(); gestureDone = true }
            else if (dragEnabled && distance > threshold) {
                var distX = startPoint.x - center.x
                var distY = startPoint.y - center.y
                var xBigger = Math.abs(distX) >= Math.abs(distY)
                if      (xBigger && distX >= 0) { dragLeft(); gestureDone = true }
                else if (xBigger && distX < 0)  { dragRight(); gestureDone = true }
                else if (distY >= 0)            { dragUp(); gestureDone = true }
                else                            { dragDown(); gestureDone = true }
            }
        }
    }
}

即使我告诉MultiPointTouchArea只关心2点事件，它仍会捕获1点事件，并阻止mouseArea接收信号。

最后，你不能在Flickable或任何鼠标事件项的MouseArea之上触摸手势，因为它们永远不会收到任何信号

你知道如何解决这个问题吗？

Answer 1

这显然是一个错误，我在那里报告：

https://bugreports.qt.io/browse/QTBUG-49992

传播MultiPointTouchArea事件

1 个答案: