今天主要核心是在几年前，尝试过Qt在隐藏标题栏情况下实现可自由缩放的效果，
今天这坑终于天上了，看下演示效果 参考链接忘记了，浏览记录里面没有找到，如有侵权，联系我
大致就是这样的，剩下的看下代码
//头文件
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QPushButton>
#include <QMouseEvent>
#include <QApplication>
#include <QDebug>
enum windowEdge{
TOPLEFT = 11,
TOP = 12,
TOPRIGHT = 13,
LEFT = 21,
CENTER = 22,
RIGHT = 23,
BUTTOMLEFT = 31,
BUTTOM = 32,
BUTTOMRIGHT = 33
};
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
signals:
protected:
/**
* @brief mousePressEvent
* @param event
* 鼠标按下事件
*/
void mousePressEvent(QMouseEvent *event);
/**
* @brief mouseMoveEvent
* @param event
* 鼠标移动事件
*/
void mouseMoveEvent(QMouseEvent *event);
/**
* @brief mouseReleaseEvent
* @param event
* 鼠标松开事件
*/
void mouseReleaseEvent(QMouseEvent *event);
/**
* @brief mouseDoubleClickEvent
* @param event
* 鼠标双击事件
*/
void mouseDoubleClickEvent(QMouseEvent *event);
/**
* @brief setCursorShape
* @param mPos
* 设置鼠标形状
*/
void setCursorShape(int mPos);
/**
* @brief calCursorCol
* @param pt
* @return
* 计算鼠标X的位置
*/
int calCursorCol(QPoint pt);
/**
* @brief calCursorPos
* @param pt
* @param colPos
* @return
* 计算鼠标的位置
*/
int calCursorPos(QPoint pt,int colPos);
private:
QPoint m_mousePoint; //用于存储鼠标位置
bool m_moveFlag = false; //窗口移动标志位
bool m_resizeFlag = false; //窗口大小重置标志
const int m_titleHight = 30; //用于标记标题栏高度
const int m_frameShape = 2; //用于鼠标区域判断
int m_iCalCursorPos;
QRect m_rtPreGeometry;
QPoint m_ptViewMousePos;
QPushButton *m_pushbuttonClose = nullptr;
};
#endif // MAINWINDOW_H
//源文件
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
this->resize(800,600);
this->setWindowFlags(Qt::FramelessWindowHint);
this->setMouseTracking(true);
m_pushbuttonClose = new QPushButton(this);
m_pushbuttonClose->setGeometry(100,100,100,80);
m_pushbuttonClose->setText("关闭");
// m_pushbuttonClose->setStyleSheet();
connect(m_pushbuttonClose,&QPushButton::clicked,this,[=](){this->close();});
}
void MainWindow::mousePressEvent(QMouseEvent *event)
{
if(event->y() < m_titleHight && event->y()> m_frameShape)
{
m_mousePoint = event->globalPos();
m_moveFlag = true;
}
else
{
m_iCalCursorPos = calCursorPos(event->pos(),calCursorCol(event->pos()));
if (event->button() == Qt::LeftButton)
{
if(m_iCalCursorPos != CENTER)
{
m_resizeFlag = true;
}
}
m_rtPreGeometry = geometry();
m_ptViewMousePos = event->globalPos();
}
}
void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
if((event->y() < m_titleHight) && event->y()> m_frameShape && m_moveFlag)
{
int dx = event->globalX() - m_mousePoint.x();
int dy = event->globalY() - m_mousePoint.y();
m_mousePoint = event->globalPos();
this->move(this->x()+dx,this->y()+dy);
}
else
{
if(Qt::WindowMaximized != windowState())
{
setCursorShape(calCursorPos(event->pos(),calCursorCol(event->pos())));
}
QPoint ptCurrentPos = QCursor::pos(); //获取当前的点，这个点是全局的
QPoint ptMoveSize = ptCurrentPos - m_ptViewMousePos; //计算出移动的位置，当前点 - 鼠标左键按下的点
QRect rtTempGeometry = m_rtPreGeometry;
if(m_resizeFlag)
{
switch(m_iCalCursorPos)
{
case windowEdge::TOPLEFT:
rtTempGeometry.setTopLeft(m_rtPreGeometry.topLeft()+ptMoveSize);
break;
case windowEdge::TOP:
rtTempGeometry.setTop(m_rtPreGeometry.top()+ptMoveSize.y());
break;
case windowEdge::TOPRIGHT:
rtTempGeometry.setTopRight(m_rtPreGeometry.topRight()+ptMoveSize);
break;
case windowEdge::LEFT:
rtTempGeometry.setLeft(m_rtPreGeometry.left()+ptMoveSize.x());
break;
case windowEdge::RIGHT:
rtTempGeometry.setRight(m_rtPreGeometry.right()+ptMoveSize.x());
break;
case windowEdge::BUTTOMLEFT:
rtTempGeometry.setBottomLeft(m_rtPreGeometry.bottomLeft()+ptMoveSize);
break;
case windowEdge::BUTTOM:
rtTempGeometry.setBottom(m_rtPreGeometry.bottom()+ptMoveSize.y());
break;
case windowEdge::BUTTOMRIGHT:
rtTempGeometry.setBottomRight(m_rtPreGeometry.bottomRight()+ptMoveSize);
break;
default:
break;
}
this->setGeometry(rtTempGeometry);
}
}
}
void MainWindow::mouseReleaseEvent(QMouseEvent *event)
{
if(event->y() < m_titleHight && event->y()> m_frameShape && m_moveFlag)
{
int dx = event->globalX() - m_mousePoint.x();
int dy = event->globalY() - m_mousePoint.y();
m_mousePoint = event->globalPos();
this->move(this->x()+dx,this->y()+dy);
m_moveFlag = !m_moveFlag;
}
else
{
m_resizeFlag = !m_resizeFlag;
QApplication::restoreOverrideCursor();
}
}
void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)
{
if(event->button() == Qt::LeftButton) //鼠标双击最大化/正常
{
if(event->y() < m_titleHight)
{
if(windowState() != Qt::WindowMaximized)
{
this->showMaximized();
}
else
{
this->showNormal();
}
}
}
}
void MainWindow::setCursorShape(int mPos)
{
Qt::CursorShape mCursor;
switch (mPos)
{
case windowEdge::TOPLEFT:
case windowEdge::BUTTOMRIGHT:
mCursor = Qt::SizeFDiagCursor;
break;
case windowEdge::TOPRIGHT:
case windowEdge::BUTTOMLEFT:
mCursor = Qt::SizeBDiagCursor;
break;
case windowEdge::TOP:
case windowEdge::BUTTOM:
mCursor = Qt::SizeVerCursor;
break;
case windowEdge::LEFT:
case windowEdge::RIGHT:
mCursor = Qt::SizeHorCursor;
break;
default:
mCursor = Qt::ArrowCursor;
break;
}
this->setCursor(mCursor);
}
int MainWindow::calCursorCol(QPoint pt)
{
return (pt.x() < m_frameShape ? 1 : ((pt.x() > this->width() - m_frameShape) ? 3 : 2));
}
int MainWindow::calCursorPos(QPoint pt, int colPos)
{
return ((pt.y() < m_frameShape ? 10 : ((pt.y() > this->height() - m_frameShape) ? 30 : 20)) + colPos);
}
