QT隐藏系统标题栏实现窗体拖拽移动

LoginUI.h

#pragma once

#include 
#include "ui_LoginUI.h"

class LoginUI : public QDialog
{
	Q_OBJECT

public:
	LoginUI(QWidget *parent = Q_NULLPTR);
	~LoginUI();

	//界面相关
public:
	void InitUI();
protected:
	void mousePressEvent(QMouseEvent *event);
	void mouseMoveEvent(QMouseEvent *event);
	void mouseReleaseEvent(QMouseEvent *event);

private:
	Ui::LoginUI * ui;
	bool m_move;
	QPoint m_startPoint;
	QPoint m_windowPoint;
};

LoginUI.cpp

#include "LoginUI.h"

LoginUI::LoginUI(QWidget *parent)
	: QDialog(parent)
	, ui(new Ui::LoginUI)
	, m_move(false)
{
	ui->setupUi(this);
	InitUI();
}

LoginUI::~LoginUI()
{

}

void LoginUI::InitUI()
{
	setWindowFlags(Qt::Window | Qt::FramelessWindowHint
		| Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint);
}

void LoginUI::mousePressEvent(QMouseEvent *event)
{
	//当鼠标左键点击时.
	if (event->button() == Qt::LeftButton)
	{
		m_move = true;
		//记录鼠标的世界坐标.
		m_startPoint = event->globalPos();
		//记录窗体的世界坐标.
		m_windowPoint = this->frameGeometry().topLeft();
	}
}

void LoginUI::mouseMoveEvent(QMouseEvent *event)
{
	if ((event->buttons()) & Qt::LeftButton && m_move)
	{
		//移动中的鼠标位置相对于初始位置的相对位置.
		QPoint relativePos = event->globalPos() - m_startPoint;
		//然后移动窗体即可.
		this->move(m_windowPoint + relativePos);
	}
}

void LoginUI::mouseReleaseEvent(QMouseEvent *event)
{
	if (event->button() == Qt::LeftButton)
	{
		//改变移动状态.
		m_move = false;
	}
}