QT 界面隐藏标题栏后设置可支持拖动

QT 界面隐藏标题栏后设置可支持拖动，需要重写界面的mousePressEvent，mouseMoveEvent，mouseReleaseEvent事件，代码如下。

 1 #include <QWidget>
 2 #include <QMouseEvent>
 3 
 4 class CustomWidget : public QWidget {
 5     Q_OBJECT
 6 
 7 public:
 8     explicit CustomWidget(QWidget *parent = nullptr);
 9 
10 protected:
11     void mousePressEvent(QMouseEvent *event) override;
12     void mouseMoveEvent(QMouseEvent *event) override;
13     void mouseReleaseEvent(QMouseEvent *event) override;
14 
15 private:
16     bool isDragging;
17     QPoint dragPosition;
18 };
19 
20 CustomWidget::CustomWidget(QWidget *parent) : QWidget(parent), isDragging(false) {
21     // 隐藏标题栏
22     setWindowFlags(Qt::FramelessWindowHint);
23 }
24 
25 void CustomWidget::mousePressEvent(QMouseEvent *event) {
26     if (event->button() == Qt::LeftButton) {
27         isDragging = true;
28         dragPosition = event->globalPos() - frameGeometry().topLeft();
29         event->accept();
30     }
31 }
32 
33 void CustomWidget::mouseMoveEvent(QMouseEvent *event) {
34     if (isDragging) {
35         move(event->globalPos() - dragPosition);
36         event->accept();
37     }
38 }
39 
40 void CustomWidget::mouseReleaseEvent(QMouseEvent *event) {
41     if (event->button() == Qt::LeftButton) {
42         isDragging = false;
43         event->accept();
44     }
45 }
46 
47 int main(int argc, char *argv[]) {
48     QApplication a(argc, argv);
49     CustomWidget widget;
50     widget.setGeometry(100, 100, 400, 200);  // 设置初始位置和大小
51     widget.show();
52 
53     return a.exec();
54 }