DropArea 不通知有关 onEntered、onExited、onDropped 的操作

Question

我已经 Rectangle 填充了 MouseArea，在 onPressAndHold() 处理程序上显示第二个 Rectangle 并将 drag 操作转移到那个 Rectangle。问题是，当我将第二个 Rectangle 移动到 DropArea 上时，它不会通知任何操作（onEntered、onExited、onDropped）。我尝试以多种组合来执行此操作，但从未奏效。这是一个示例，我是否遗漏了什么？

import QtQuick 2.0
import QtQuick.Window 2.0

Window {
    id: appDrawerRoot
    visible: true
    width: 360; height: 360
    property bool isRectVisible: false

    Rectangle{
        id:rect
        color: "blue"
        x:50; y:50
        width: 50; height: 50

        MouseArea{
            anchors.fill: parent

            onPressed: {
                cloneRect.x = rect.x
                cloneRect.y = rect.y
            }
            onPressAndHold: {
                isRectVisible = true
                drag.target = cloneRect
            }
            onReleased: {
                drag.target = undefined
                isRectVisible = false
                cloneRect.x = rect.x
                cloneRect.y = rect.y +100
            }
        }
    }

    Item{
        id: cloneRect
        width: 50; height:50
        visible: isRectVisible

        MouseArea{
            id: mouseArea
            width:50; height:50
            anchors.centerIn: parent

            Rectangle{
                id:tile
                width: 50; height:50
                color:"black"
                opacity: 0.5
                anchors.verticalCenter: parent.verticalCenter
                anchors.horizontalCenter: parent.horizontalCenter
                Drag.hotSpot.x: 25
                Drag.hotSpot.y: 25
            }
        }
    }

    DropArea {
        id:dropArea
        x:153
        y:158
        z:-1
        width:100; height: 100

        Rectangle{
            anchors.fill: parent
            color: "Green"
        }
        onEntered: {
            drag.source.opacity = 1
            console.log("ENTERED")
        }
        onExited: {
            drag.source.opacity = 0.5
            console.log("EXITED")
        }
        onDropped:
        {
            console.log("DROPPED")
        }
    }
}

Answer 1

您的代码的主要问题是您没有设置拖动的 active 属性。像这样修改你的代码：

//..........................
Item{
    id: cloneRect
    width: 50; height:50
    visible: isRectVisible

    Drag.active: visible // Add this line of code
//.....................

更多信息请参考Qt实例。在 Qt Creator 的 "Welcome" 屏幕上点击 "Examples" 按钮并搜索 "drag and drop qml".

DropArea 不通知有关 onEntered、onExited、onDropped 的操作

DropArea doesn't notify about actions onEntered, onExited, onDropped

qt

drag-and-drop

qml

qt5

qtquick2