QT 隐藏标题栏 窗口移动 鼠标事件

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隐藏标题栏

setWindowFlags(Qt::FramelessWindowHint | windowFlags());

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头文件声明虚函数

• widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <a.out.h>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

protected:
    virtual void mousePressEvent(QMouseEvent *event);       // 鼠标按下
    virtual void mouseMoveEvent(QMouseEvent *event);        // 移动
    virtual void mouseReleaseEvent(QMouseEvent *event);     // 鼠标释放
private:
    Ui::Widget *ui;
    bool m_pressed;       // 判断鼠标左键是否按下
    QPoint m_pos;         // 鼠标相对于窗口的位置，不是相对屏幕的位置
};

#endif // WIDGET_H

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实现虚函数

• Widget.cpp

void Widget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        m_pressed = true;
        m_pos = event->pos();     
    }
}

void Widget::mouseMoveEvent(QMouseEvent *event)
{
    if(m_pressed)
    {
        move(event->pos() - m_pos + this->pos());
    }
}

void Widget::mouseReleaseEvent(QMouseEvent *event)
{
    Q_UNUSED(event);            // avoid the warnning that 'event' is unused while building the project

    m_pressed = false;
}

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