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import QtQuick 2.9
MouseArea {
id: root
property real lastX: 0
property real lastY: 0
property bool mask: false //有时候外面需要屏蔽拖动，导出一个mask属性， 默认false。
property var control: parent //导出一个control属性，指定要拖动的目标， 默认就用parent好了。注意目标要有x和y属性并且可修改
onPressed: {
lastX = mouseX;
lastY = mouseY;
}
onContainsMouseChanged: { //修改一下鼠标样式，以示区别
if (containsMouse) {
cursorShape = Qt.SizeAllCursor;
} else {
cursorShape = Qt.ArrowCursor;
onPositionChanged: {
if (!mask && pressed && control)
{
control.x +=mouseX - lastX
control.y +=mouseY - lastY