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import QtQuick 2.0
Rectangle {
id: whiteRect
width: 200
height: 200
color: "white"
Rectangle {
id: blackRect
objectName: "blackrect"
color: "black"
y: 50
x: 50
width: 100
height: 100
opacity: (whiteRect.width-blackRect.x+whiteRect.height-blackRect.y-199)/200
Text { text: blackRect.opacity}
MouseArea {
objectName: "mouseregion"
anchors.fill: parent
drag.target: blackRect
drag.axis: Drag.XAndYAxis
drag.minimumX: 0
drag.maximumX: whiteRect.width-blackRect.width
drag.minimumY: 0
drag.maximumY: whiteRect.height-blackRect.height
}
}
}
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