我們都知道，當我們滑鼠點選並移動應用程式的上邊框時，窗口才會整體移動，但有些視窗，你點選移動其他部分，也可以讓視窗跟著滑鼠移動，這裡就教你如何整體移動視窗.

其實實現這樣的功能很簡單，只需要重寫以下的3個滑鼠函式即可.

//"c.h"
#ifndef C_H
#define C_H

#include <QtWidgets/QWidget>
#include "ui_c.h"
#include <QMouseEvent>

class c : public QWidget
{
    Q_OBJECT

public:
    c(QWidget *parent = 0
 
);
    ~c();

protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
private:
    Ui::cClass ui;
    bool m_move;
    QPoint m_startPoint;
    QPoint m_windowPoint;
};

#endif // C_H

//"c.cpp"
#include "c.h"
 


c::c(QWidget *parent)
    : QWidget(parent)
{
    ui.setupUi(this);
    //給是否移動的標誌初始化為false.
    m_move = false;
}

c::~c()
{

}
void c::mousePressEvent(QMouseEvent *event)
{
    //當滑鼠左鍵點選時.
    if (event->button() == Qt::LeftButton)
    {
        m_move = true;
        //記錄滑鼠的世界座標.
        m_startPoint = event
 
->globalPos();
        //記錄窗體的世界座標.
        m_windowPoint = this->frameGeometry().topLeft();
    }
}
void c::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton)
    {
        //移動中的滑鼠位置相對於初始位置的相對位置.
        QPoint relativePos = event->globalPos() - m_startPoint;
        //然後移動窗體即可.
        this->move(m_windowPoint + relativePos );
    }
}
void c::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        //改變移動狀態.
        m_move = false;
    }
}