Qt 左键拖动窗口（没有标题栏）

最新推荐文章于 2024-08-09 16:58:16 发布

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最新推荐文章于 2024-08-09 16:58:16 发布

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本文链接：https://blog.youkuaiyun.com/chenfeng898/article/details/8876538

本文介绍了如何使用Qt处理鼠标拖动事件，通过重写mousePressEvent和mouseMoveEvent方法实现窗口的自由拖动。文章详细解释了如何获取鼠标事件的位置信息，并利用这些信息更新窗口位置。

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void ShapedClock::mousePressEvent(QMouseEvent *event) {

if (event->button() == Qt::LeftButton) {

dragPosition = event->globalPos() - frameGeometry().topLeft();

event->accept();

}

void ShapedClock::mouseMoveEvent(QMouseEvent *event) {

if (event->buttons() & Qt::LeftButton) {

move(event->globalPos() - dragPosition);

event->accept();

}

const QPoint & QMouseEvent::globalPos () const

Returns the global position of the mouse cursor at the time of the event. This is important on asynchronous window systems like X11. Whenever you move your widgets around in response to mouse events, globalPos() may differ a lot from the current pointer position QCursor::pos(), and from QWidget::mapToGlobal(pos()).

QPoint QWidget::mapToGlobal ( const QPoint & pos ) const

Translates the widget coordinate pos to global screen coordinates. For example, mapToGlobal(QPoint(0,0)) would give the global coordinates of the top-left pixel of the widget.

QPoint QWidget::mapFromGlobal ( const QPoint & pos ) const

Translates the global screen coordinate pos to widget coordinates.