核心思想是：
在main中引入QMainWindow对象，将qml文件作为该对象的widget，并将该对象注册到qml中，然后再qml中通过识别鼠标的位移来更改这个mainwindow的pos属性。
实现：#include
#include
#include
#include
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QMainWindow window;
QDeclarativeView* v = new QDeclarativeView;
window.setCentralWidget(v);
v->setSource(QUrl::fromLocalFile(("draw_rectangles.qml")));
// expose window object to QML
v->rootContext()->setContextProperty("mainwindow",&window);
window.setStyleSheet("background:transparent;");
window.setAttribute(Qt::WA_TranslucentBackground);
window.setWindowFlags(Qt::FramelessWindowHint);
window.show();
app.exec();
}
qml：Item {
Rectangle {
color: "blue"
x: 50; y: 50; width: 100; height: 100
MouseArea {
id: mouseRegion
anchors.fill: parent;
property variant clickPos: "1,1"
onPressed: {
clickPos = Qt.point(mouse.x,mouse.y)
}
onPositionChanged: {
var delta = Qt.point(mouse.x-clickPos.x, mouse.y-clickPos.y)
mainwindow.pos = Qt.point(mainwindow.pos.x+delta.x,
mainwindow.pos.y+delta.y)
}
} //mousearea
} //rectangle
}
转载：/sgnh123456/article/details/8055654
