Qt 隐藏标题栏可拖拽，自由缩放
【摘要】
Qt在隐藏标题栏的情况下，实现拖拽很简单，可以看这里https://blog.csdn.net/z609932088/article/details/80865742
或者这里：https://blog.csdn.net/z609932088/article/details/50898022
今天主要核心...
Qt在隐藏标题栏的情况下，实现拖拽很简单，可以看这里https://blog.csdn.net/z609932088/article/details/80865742
或者这里：https://blog.csdn.net/z609932088/article/details/50898022
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，
原来的坑在这里：https://blog.csdn.net/z609932088/article/details/53929904
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
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//头文件
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#ifndef MAINWINDOW_H
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#define MAINWINDOW_H
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#include <QMainWindow>
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#include <QPushButton>
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#include <QMouseEvent>
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#include <QApplication>
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#include <QDebug>
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enum windowEdge{
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TOPLEFT = 11,
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TOP = 12,
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TOPRIGHT = 13,
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LEFT = 21,
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CENTER = 22,
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RIGHT = 23,
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BUTTOMLEFT = 31,
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BUTTOM = 32,
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BUTTOMRIGHT = 33
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};
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class MainWindow : public QMainWindow
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{
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Q_OBJECT
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public:
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explicit MainWindow(QWidget *parent = nullptr);
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signals:
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protected:
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/**
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* @brief mousePressEvent
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* @param event
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* 鼠标按下事件
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*/
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void mousePressEvent(QMouseEvent *event);
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/**
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* @brief mouseMoveEvent
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* @param event
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* 鼠标移动事件
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*/
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void mouseMoveEvent(QMouseEvent *event);
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/**
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* @brief mouseReleaseEvent
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* @param event
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* 鼠标松开事件
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*/
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void mouseReleaseEvent(QMouseEvent *event);
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/**
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* @brief mouseDoubleClickEvent
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* @param event
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* 鼠标双击事件
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*/
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void mouseDoubleClickEvent(QMouseEvent *event);
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/**
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* @brief setCursorShape
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* @param mPos
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* 设置鼠标形状
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*/
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void setCursorShape(int mPos);
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/**
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* @brief calCursorCol
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* @param pt
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* @return
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* 计算鼠标X的位置
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*/
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int calCursorCol(QPoint pt);
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/**
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* @brief calCursorPos
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* @param pt
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* @param colPos
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* @return
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* 计算鼠标的位置
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*/
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int calCursorPos(QPoint pt,int colPos);
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private:
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QPoint m_mousePoint; //用于存储鼠标位置
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bool m_moveFlag = false; //窗口移动标志位
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bool m_resizeFlag = false; //窗口大小重置标志
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const int m_titleHight = 30; //用于标记标题栏高度
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const int m_frameShape = 2; //用于鼠标区域判断
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int m_iCalCursorPos;
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QRect m_rtPreGeometry;
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QPoint m_ptViewMousePos;
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QPushButton *m_pushbuttonClose = nullptr;
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};
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#endif // MAINWINDOW_H
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//源文件
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#include "mainwindow.h"
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MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
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{
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this->resize(800,600);
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this->setWindowFlags(Qt::FramelessWindowHint);
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this->setMouseTracking(true);
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m_pushbuttonClose = new QPushButton(this);
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m_pushbuttonClose->setGeometry(100,100,100,80);
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m_pushbuttonClose->setText("关闭");
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// m_pushbuttonClose->setStyleSheet();
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connect(m_pushbuttonClose,&QPushButton::clicked,this,[=](){this->close();});
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}
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void MainWindow::mousePressEvent(QMouseEvent *event)
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{
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if(event->y() < m_titleHight && event->y()> m_frameShape)
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{
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m_mousePoint = event->globalPos();
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m_moveFlag = true;
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}
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else
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{
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m_iCalCursorPos = calCursorPos(event->pos(),calCursorCol(event->pos()));
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if (event->button() == Qt::LeftButton)
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{
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if(m_iCalCursorPos != CENTER)
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{
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m_resizeFlag = true;
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}
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}
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m_rtPreGeometry = geometry();
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m_ptViewMousePos = event->globalPos();
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}
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}
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void MainWindow::mouseMoveEvent(QMouseEvent *event)
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{
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if((event->y() < m_titleHight) && event->y()> m_frameShape && m_moveFlag)
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{
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int dx = event->globalX() - m_mousePoint.x();
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int dy = event->globalY() - m_mousePoint.y();
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m_mousePoint = event->globalPos();
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this->move(this->x()+dx,this->y()+dy);
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}
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else
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{
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if(Qt::WindowMaximized != windowState())
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{
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setCursorShape(calCursorPos(event->pos(),calCursorCol(event->pos())));
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}
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QPoint ptCurrentPos = QCursor::pos(); //获取当前的点，这个点是全局的
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QPoint ptMoveSize = ptCurrentPos - m_ptViewMousePos; //计算出移动的位置，当前点 - 鼠标左键按下的点
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QRect rtTempGeometry = m_rtPreGeometry;
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if(m_resizeFlag)
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{
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switch(m_iCalCursorPos)
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{
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case windowEdge::TOPLEFT:
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rtTempGeometry.setTopLeft(m_rtPreGeometry.topLeft()+ptMoveSize);
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break;
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case windowEdge::TOP:
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rtTempGeometry.setTop(m_rtPreGeometry.top()+ptMoveSize.y());
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break;
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case windowEdge::TOPRIGHT:
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rtTempGeometry.setTopRight(m_rtPreGeometry.topRight()+ptMoveSize);
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break;
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case windowEdge::LEFT:
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rtTempGeometry.setLeft(m_rtPreGeometry.left()+ptMoveSize.x());
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break;
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case windowEdge::RIGHT:
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rtTempGeometry.setRight(m_rtPreGeometry.right()+ptMoveSize.x());
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break;
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case windowEdge::BUTTOMLEFT:
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rtTempGeometry.setBottomLeft(m_rtPreGeometry.bottomLeft()+ptMoveSize);
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break;
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case windowEdge::BUTTOM:
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rtTempGeometry.setBottom(m_rtPreGeometry.bottom()+ptMoveSize.y());
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break;
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case windowEdge::BUTTOMRIGHT:
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rtTempGeometry.setBottomRight(m_rtPreGeometry.bottomRight()+ptMoveSize);
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break;
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default:
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break;
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}
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this->setGeometry(rtTempGeometry);
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}
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}
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}
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void MainWindow::mouseReleaseEvent(QMouseEvent *event)
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{
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if(event->y() < m_titleHight && event->y()> m_frameShape && m_moveFlag)
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{
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int dx = event->globalX() - m_mousePoint.x();
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int dy = event->globalY() - m_mousePoint.y();
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m_mousePoint = event->globalPos();
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this->move(this->x()+dx,this->y()+dy);
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m_moveFlag = !m_moveFlag;
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}
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else
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{
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m_resizeFlag = !m_resizeFlag;
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QApplication::restoreOverrideCursor();
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}
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}
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void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)
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{
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if(event->button() == Qt::LeftButton) //鼠标双击最大化/正常
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{
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if(event->y() < m_titleHight)
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{
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if(windowState() != Qt::WindowMaximized)
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{
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this->showMaximized();
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}
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else
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{
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this->showNormal();
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}
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}
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}
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}
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void MainWindow::setCursorShape(int mPos)
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{
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Qt::CursorShape mCursor;
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switch (mPos)
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{
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case windowEdge::TOPLEFT:
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case windowEdge::BUTTOMRIGHT:
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mCursor = Qt::SizeFDiagCursor;
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break;
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case windowEdge::TOPRIGHT:
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case windowEdge::BUTTOMLEFT:
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mCursor = Qt::SizeBDiagCursor;
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break;
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case windowEdge::TOP:
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case windowEdge::BUTTOM:
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mCursor = Qt::SizeVerCursor;
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break;
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case windowEdge::LEFT:
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case windowEdge::RIGHT:
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mCursor = Qt::SizeHorCursor;
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break;
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default:
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mCursor = Qt::ArrowCursor;
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break;
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}
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this->setCursor(mCursor);
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}
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int MainWindow::calCursorCol(QPoint pt)
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{
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return (pt.x() < m_frameShape ? 1 : ((pt.x() > this->width() - m_frameShape) ? 3 : 2));
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}
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int MainWindow::calCursorPos(QPoint pt, int colPos)
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{
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return ((pt.y() < m_frameShape ? 10 : ((pt.y() > this->height() - m_frameShape) ? 30 : 20)) + colPos);
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}
文章来源: dreamlife.blog.csdn.net，作者：DreamLife.，版权归原作者所有，如需转载，请联系作者。
原文链接：dreamlife.blog.csdn.net/article/details/105710739
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