Qt无边框

最简单的可拖动对话框(大小不可改变)

#ifndef DIALOG_H
#define DIALOG_H/*** @file dialog.h* @author lpl* @brief 无边框dialog类* @date 2024/06/05*/
#include <QDialog>
#include <QMouseEvent>
namespace Ui {
class Dialog;
}
/*** @brief The Dialog class* 无边框dialog*/
class Dialog : public QDialog
{Q_OBJECTpublic:explicit Dialog(QWidget *parent = 0);~Dialog();/*** @brief mousePressEvent   鼠标点击事件* @param ev 鼠标事件*/virtual void mousePressEvent(QMouseEvent *ev) override;/*** @brief mouseMoveEvent   鼠标移动事件* @param ev 鼠标事件*/virtual void mouseMoveEvent(QMouseEvent *ev) override;/*** @brief mouseReleaseEvent   鼠标释放事件* @param ev 鼠标事件*/virtual void mouseReleaseEvent(QMouseEvent *ev) override;
private:Ui::Dialog *ui;bool                    m_bIsPress;        ///< 是否点击鼠标QPoint                  m_pointMoveDis;    ///< 鼠标与电脑窗体左上角的相对位置
};#endif // DIALOG_H

#include "dialog.h"
#include "ui_dialog.h"
#include <QDebug>
#include <QMouseEvent>
Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(new Ui::Dialog)
{ui->setupUi(this);setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
}Dialog::~Dialog()
{delete ui;
}void Dialog::mousePressEvent(QMouseEvent *ev)
{qDebug()<<ev->globalPos();//按下鼠标左键if(Qt::LeftButton == ev->button()){m_pointMoveDis = ev->globalPos();m_bIsPress = true;}QDialog::mousePressEvent(ev);
}void Dialog::mouseMoveEvent(QMouseEvent *ev)
{if (ev->buttons() & Qt::LeftButton){if(m_bIsPress){QPoint movePos = ev->globalPos();this->move(this->pos() + movePos - m_pointMoveDis);m_pointMoveDis = movePos;}}QDialog::mouseMoveEvent(ev);
}void Dialog::mouseReleaseEvent(QMouseEvent *ev)
{if(Qt::LeftButton == ev->button()){m_bIsPress = false;}QDialog::mouseReleaseEvent(ev);
}