QT无标题栏移动窗体

最新推荐文章于 2024-06-04 18:30:00 发布

原创最新推荐文章于 2024-06-04 18:30:00 发布 · 736 阅读

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从一个教学ppt里看到的实现
头文件

#include <QPointer>

protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);

cpp文件

void mousePressEvent(QMouseEvent *event) {
    last = event->globalPos();
}
void mouseMoveEvent(QMouseEvent *event) {
    int dx = event->globalX() - last.x();
    int dy = event->globalY() - last.y();

    last = event->globalPos();
    move(x() + dx, y() + dy);
}
void mouseReleaseEvent(QMouseEvent *event) {
    int dx = event->globalX() - last.x();
    int dy = event->globalY() - last.y();

    move(x() + dx, y() + dy);
}

去标题栏的flag, 写在构造函数里

this->setWindowFlags(Qt::FramelessWindowHint);

这样实现了无标题栏移动窗体.
但是实践中碰到个问题, 在窗体的控件上点击拖动鼠标同样能拖动窗口. 遇到一些button上操作还会莫名其妙窗体消失. 查阅了上面几个函数触发的细节, 发现mousePressEvent函数在点击控件时是不触发的. 由此提出改进实现.
h文件添加bool, 默认true

bool isElement = true;

重载函数代码如下

void mousePressEvent(QMouseEvent *event) {
    last = event->globalPos();
    isElement = false;
}
void mouseMoveEvent(QMouseEvent *event) {
    if (isElement) return;
    int dx = event->globalX() - last.x();
    int dy = event->globalY() - last.y();

    last = event->globalPos();
    move(x() + dx, y() + dy);
}
void mouseReleaseEvent(QMouseEvent *event) {
    if (isElement) return;
    int dx = event->globalX() - last.x();
    int dy = event->globalY() - last.y();

    move(x() + dx, y() + dy);
    isElement = true;
}