按住鼠标移动QML窗体

原文地址：

将 view widget 暴露给QML:

QmlApplicationViewer viewer;
QDeclarativeContext *context = viewer.rootContext();
context->setContextProperty("viewerWidget", &viewer);

修改它的pos属性达到移动窗体的效果

MouseArea {
    anchors.fill: parent
    property variant previousPosition
    onPressed: {
        previousPosition = Qt.point(mou***, mouseY)
    }
    onPositionChanged: {
        if (pressedButtons == Qt.LeftButton) {
            var dx = mou*** - previousPosition.x
            var dy = mouseY - previousPosition.y
            viewerWidget.pos = Qt.point(viewerWidget.pos.x + dx,
                                        viewerWidget.pos.y + dy)
        }
    }
}