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

Question

I have Rectangle filled with MouseArea which on onPressAndHold() handler reveals second Rectangle and transfers drag action to that Rectangle. The problem is that when I move that second Rectangle over DropArea it doesn't notify about any actions (onEntered, onExited, onDropped). I tried to do this in many combinations but it has never worked. Here is an example, am I missing something?
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

The main problem with your code is that you don't set the active property of the drag. Modify you code like this:
//..........................
Item{
id: cloneRect
width: 50; height:50
visible: isRectVisible
Drag.active: visible // Add this line of code
//.....................
For more information please refer to Qt examples. At Qt Creator's "Welcome" screen hit "Examples" button and search for "drag and drop qml".