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news 文章来源：https://blog.csdn.net/weixin_40953784/article/details/132468424 2025/3/15 13:26:48

做旅游地产的网站和公司,chrome谷歌浏览器,网站底部固定广告代码,上海到北京多少公里一、前言实现的效果为：通过黑色矩形框预操作，鼠标释放时更新窗口。效果图如下： 1.功能 1.1 已实现功能 8个方向的缩放标题栏拖动标题栏双击最大化/正常窗口窗口最小尺寸预操作框颜色与背景色互补多屏幕默认标题栏 1.2 待开发功能拖动到…

一、前言

实现的效果为：通过黑色矩形框预操作，鼠标释放时更新窗口。效果图如下：

1.功能

1.1 已实现功能

8个方向的缩放
标题栏拖动
标题栏双击最大化/正常窗口
窗口最小尺寸
预操作框颜色与背景色互补
多屏幕
默认标题栏

1.2 待开发功能

拖动到屏幕四周进行半屏全屏。

1.3 存在的问题

1.QWebEngineView

从测试效果来看，对于普通widget效果较好，但是如果是嵌入了QWebEngineView，且其位于窗口四周，就会出现问题。

其主要原因在于，当事件进入QWebEngineView后，会被其child(QtWebEngineCore::RenderWidgetHostViewQtDelegateWidget)"吃掉"，导致后续事件不再进入主窗口，从而无法触发我们的代码。这时我们还可以遍历QWebEngineView的children，将事件安装到主窗口

        auto childs =  view->children();for(auto child:childs){child->installEventFilter(this);}

但是这样显得太笨重了。而且，即使如此，鼠标样式的修改，也会被QWebEngineView刷掉。因此对于QWebEngineView下是存在一些问题的。

2.多屏幕拖动时，从低缩放比拖到高缩放比释放时，会闪烁一次，目前没有进一步分析原因。

2.探索的过程

2.1 关于无边框缩放的实现方式

目前网上无非两种方式：

a)通过nativeEvent()实现。c++ - Qt/Windows, resizable frameless window - Stack Overflow

b)通过窗口的eventFilter()直接实现。

但是问题是前者基于windows接口不跨平台，而后者则会出现抖动。

本文则是基于第二种方式，并参考windows窗口的拖动方式，通过预操作框避免抖动的问题。

2.2 实现思路

首先关于无边框窗口，通过Qt标志处理：

setWindowFlags(Qt::FramelessWindowHint);

然后关于缩放和拖动，与网上大多数实现一致，通过九宫格法实现：

当鼠标位于不同区域时，触发不同的操作。

而对于预处理框，则是通过一个覆盖整个屏幕的透明窗口，并重写paintEvent在其中绘制一个rect。

2.3 实现难点

1.首先是九宫格的思路，了解了思路之后，实现就比较简单了

2.对于预处理框，首先是需要以全屏幕作为geometry，否则会导致拖不到非主屏幕，或者位置错误灯问题

3.其次是预处理框要实现window类似的与背景色互补(而非纯色)，需要获取全屏幕图片作为背景绘制到预操作框，然后再通过QPainter::RasterOp_SourceAndNotDestination模式取反。

4.最后就是对于多屏幕的位置，缩放比灯。

二、代码

目录结构如下：

其中：

cursorTransform是用于鼠标位置和方向的计算
framelessData则是一些全局变量
framelessHelper则是对外的接口，
titleBar表示默认标题栏
transparentRect则是实现预操作框

详细代码如下：

#include "cursorTransform.h"
#include <QDebug>AreaType CursorTransform::calculateCursorType(const QSize &size, const QPoint &pos)
{//TODO:minsizeauto w = size.width();auto h = size.height();auto x = pos.x();auto y = pos.y();//leftif(x<=FrameLessData::borderThickness){if(y<=FrameLessData::borderThickness)return AreaType::LeftTopArea;else if(y>=h-FrameLessData::borderThickness)return AreaType::LeftBottomArea;elsereturn AreaType::LeftArea;}//rightelse if(x>=w-FrameLessData::borderThickness){if(y<=FrameLessData::borderThickness)return AreaType::RightTopArea;else if(y>=h-FrameLessData::borderThickness)return AreaType::RightBottomArea;elsereturn AreaType::RightArea;}else{//centerif(y<=FrameLessData::borderThickness)return AreaType::TopArea;else if(y<=FrameLessData::titleHeight)return AreaType::TitleArea;else if(y>=h-FrameLessData::borderThickness)return AreaType::BottomArea;elsereturn AreaType::CenterArea;}}Qt::CursorShape CursorTransform::AreaType2CursorShape(AreaType type)
{Qt::CursorShape cursorType(Qt::ArrowCursor);switch (type) {case AreaType::LeftTopArea:case AreaType::RightBottomArea:cursorType=Qt::SizeFDiagCursor;break;case AreaType::RightTopArea:case AreaType::LeftBottomArea:cursorType=Qt::SizeBDiagCursor;break;case AreaType::TopArea:case AreaType::BottomArea:cursorType=Qt::SizeVerCursor;break;case AreaType::LeftArea:case AreaType::RightArea:cursorType=Qt::SizeHorCursor;break;default:break;}return cursorType;
}void CursorTransform::calculateRect(AreaType type,QRect &rect, const QPoint &lastPos,const QPoint &newPos)
{int xOff=0,yOff=0,wOff=0,hOff=0;int posXOff=newPos.x()-lastPos.x();int posYOff = newPos.y()-lastPos.y();switch (type) {case AreaType::LeftTopArea:xOff = posXOff;yOff = posYOff;break;case AreaType::TopArea:yOff = posYOff;break;case AreaType::RightTopArea:yOff = posYOff;wOff = posXOff;break;case AreaType::LeftArea:xOff = posXOff;break;case AreaType::RightArea:wOff = posXOff;break;case AreaType::LeftBottomArea:xOff = posXOff;hOff = posYOff;break;case AreaType::BottomArea:hOff = posYOff;break;case AreaType::RightBottomArea:wOff = posXOff;hOff = posYOff;break;case AreaType::TitleArea:   //moverect.moveTopLeft(rect.topLeft()+QPoint(posXOff,posYOff));break;default:break;}//min judget:if(rect.width()-xOff<=FrameLessData::minWidth)xOff=0;else if(rect.left()<newPos.x() && xOff<0)xOff=0;if(rect.width()+wOff<=FrameLessData::minWidth)wOff=0;else if(rect.right()>newPos.x() && wOff>0)wOff=0;if(rect.height()-yOff<=FrameLessData::minHeight)yOff=0;else if(rect.top()<newPos.y() && yOff<0)yOff=0;if(rect.height()+hOff<=FrameLessData::minHeight)hOff=0;else if(rect.bottom()>newPos.y() && hOff>0)hOff=0;//resize:rect.setTop(rect.top()+yOff);rect.setLeft(rect.left()+xOff);rect.setWidth(rect.width()+wOff);rect.setHeight(rect.height()+hOff);
}

#ifndef CURSORTRANSFORM_H
#define CURSORTRANSFORM_H
#include "framelessData.h"
#include <QRect>class CursorTransform
{
public:static AreaType calculateCursorType(const QSize &size, const QPoint &pos);static enum Qt::CursorShape AreaType2CursorShape(AreaType type);static void calculateRect(AreaType type,QRect &rect,const QPoint &lastPos,const QPoint &newPos);
private:
};#endif // CURSORTRANSFORM_H

#include "framelessData.h"int FrameLessData::borderThickness=4;
int FrameLessData::titleHeight=30;
int FrameLessData::minHeight=355;
int FrameLessData::minWidth=220;
QColor FrameLessData::borderColor=(Qt::white);
QColor FrameLessData::transparentRectBkground=(Qt::transparent);
enum Qt::PenStyle FrameLessData::borderStyle=(Qt::SolidLine);

#ifndef FRAMELESSDATA_H
#define FRAMELESSDATA_H
#include <QColor>
#include <QPoint>
#include <QSize>//透明矩形的属性class FrameLessData{
public:static int borderThickness;static int titleHeight;static int minHeight;static int minWidth;static QColor borderColor;static QColor transparentRectBkground;static enum Qt::PenStyle borderStyle;
};enum class AreaType
{LeftTopArea,TopArea,RightTopArea,LeftArea,RightArea,LeftBottomArea,BottomArea,RightBottomArea,CenterArea,TitleArea,None
};enum class WidgetOperator
{None,Resize,Move
};#endif // FRAMELESSDATA_H

#include "framelessHelper.h"
#include "cursorTransform.h"
#include <QEvent>
#include <QSize>
#include <QPoint>
#include <QCursor>
#include <QWidget>
#include <QPainter>
#include <QDebug>FrameLessHelper::FrameLessHelper(QWidget *widget): m_widget(widget), m_transparentRect(new TransparentRect()), m_widgetOperator(WidgetOperator::None), m_isMove(false)
#ifdef TITLEBAR, m_titleBar(nullptr)
#endif
{m_transparentRect->setRect(m_widget->frameGeometry());
#ifdef TITLEBAR//if use titlem_titleBar = new TitleBar(m_widget);connect(m_titleBar,&TitleBar::minimumSizeClick,this,&FrameLessHelper::onMinClick);connect(m_titleBar,&TitleBar::showNormalClick,this,&FrameLessHelper::onMaxClick);connect(m_titleBar,&TitleBar::closeClick,this,&FrameLessHelper::onCloseClick);
#endif
}bool FrameLessHelper::eventFilter(QObject *watched, QEvent *event)
{int ret=false;switch (event->type()) {case QEvent::MouseButtonDblClick:   //double clickret = onDbClickEvent(static_cast<QMouseEvent *>(event));break;case QEvent::MouseButtonPress:ret = onMousePressEvent(static_cast<QMouseEvent *>(event));break;case QEvent::MouseButtonRelease:ret = onMouseReleaseEvent(static_cast<QMouseEvent *>(event));break;case QEvent::MouseMove:ret = onMoveEvent(static_cast<QMouseEvent *>(event));break;case QEvent::HoverMove:case QEvent::HoverEnter:ret = onHoverEvent(watched,static_cast<QHoverEvent *>(event));break;default:break;}//触发返回trueif(ret)return ret;return QObject::eventFilter(watched,event);
}void FrameLessHelper::setBorderThickness(int thickness)
{FrameLessData::borderThickness = thickness;
}void FrameLessHelper::setTitleHeight(int height)
{FrameLessData::titleHeight = height;
}void FrameLessHelper::setMinHeight(int height)
{FrameLessData::minHeight = height;
}void FrameLessHelper::setMinWidth(int width)
{FrameLessData::minWidth = width;
}
#ifdef TITLEBAR
QWidget *FrameLessHelper::getTitleBar()
{return m_titleBar;
}void FrameLessHelper::onMinClick()
{m_widget->showMinimized();
}void FrameLessHelper::onMaxClick()
{if(m_widget->isFullScreen())m_widget->showNormal();elsem_widget->showFullScreen();
}void FrameLessHelper::onCloseClick()
{m_widget->close();
}
#endif
bool FrameLessHelper::onHoverEvent(QObject *watched,QHoverEvent *event)
{//操作的时候不响应hoverif(m_widgetOperator!=WidgetOperator::None || m_widget->isFullScreen())return false;//hover moveauto areatype = CursorTransform::calculateCursorType(m_widget->size(),event->pos());auto w=static_cast<QWidget *>(watched);if(w)w->setCursor(CursorTransform::AreaType2CursorShape(areatype));elsem_widget->setCursor(CursorTransform::AreaType2CursorShape(areatype));return true;//hover leave -> Qt::ArrowCursor//not need
}bool FrameLessHelper::onDbClickEvent(QMouseEvent *event)
{if(event->button()!=Qt::LeftButton){return false;}auto areatype = CursorTransform::calculateCursorType(m_widget->size(),event->globalPos()-m_widget->pos());if(areatype==AreaType::TitleArea){if(m_widget->isFullScreen()){m_widget->showNormal();}else{m_widget->showFullScreen();}
#ifdef TITLEBARm_titleBar->onMaxClick();
#endif}return true;
}bool FrameLessHelper::onMousePressEvent(QMouseEvent *event)
{if(event->button()!=Qt::LeftButton){return false;}auto type = CursorTransform::calculateCursorType(m_widget->size(),event->globalPos()-m_widget->pos());if(type<AreaType::CenterArea){//resizem_widgetOperator = WidgetOperator::Resize;// not start show rectm_transparentRect->setRect(m_widget->frameGeometry());m_transparentRect->onMousePressEvent(event,type);return true;}else if(type==AreaType::TitleArea){//movem_widgetOperator = WidgetOperator::Move;if(!m_widget->isFullScreen())m_transparentRect->setRect(m_widget->geometry());else{m_transparentRect->setRect(calMaxMoveRect(event->globalPos()));}m_transparentRect->onMousePressEvent(event,type);return true;}return false;
}bool FrameLessHelper::onMoveEvent(QMouseEvent *event)
{if(m_widgetOperator==WidgetOperator::None ||(m_widgetOperator == WidgetOperator::Resize && m_widget->isFullScreen())){return false;}#ifdef TITLEBARif(m_widget->isFullScreen())m_titleBar->onMaxClick();
#endifm_isMove =true;m_transparentRect->show();m_transparentRect->onMoveEvent(event,event->globalPos()-m_widget->pos());return false;
}bool FrameLessHelper::onMouseReleaseEvent(QMouseEvent *event)
{if(event->button()!=Qt::LeftButton || m_widgetOperator==WidgetOperator::None){return false;}m_transparentRect->onMouseReleaseEvent(event);m_transparentRect->hide();if(m_isMove){if(m_widget->isFullScreen())m_widget->showNormal();auto &&rect = m_transparentRect->getRect();m_widget->move(rect.topLeft());m_widget->resize(rect.size());}m_isMove = false;m_widgetOperator = WidgetOperator::None;return false;
}QRect FrameLessHelper::calMaxMoveRect(const QPoint &evPos)
{//最大化时拖动标题栏的规则：宽度分为3份，鼠标位于左侧则向左上角对齐，右侧则向右上角对齐，中间部分则按中间对齐auto rect = m_widget->normalGeometry();rect.moveTop(0);double gPosX=evPos.x();double step = m_widget->geometry().width()/3.0;double left=0;if(gPosX>step*2){left=step*3-rect.width();}else if(gPosX>step && gPosX<=step*2){left=gPosX-rect.width()/2.0;}rect.moveLeft(left);return rect;
}

#ifndef FRAMELESSHELPER_H
#define FRAMELESSHELPER_H
#include "transparentRect.h"
#include "titleBar.h"
#include "cursorTransform.h"#include <QObject>
#include <QMouseEvent>
#include <QHoverEvent>
#include <QRect>
#include <QWidget>/*
FrameLessHelper
1.管理窗口无边框功能
2.输入为QWidget(构造)和QEvent(eventFilter)
*/
class FrameLessHelper : public QObject
{Q_OBJECT
public:FrameLessHelper(QWidget *widget);bool eventFilter(QObject *watched, QEvent *event) override;void setBorderThickness(int thickness);void setTitleHeight(int height);void setMinHeight(int height);void setMinWidth(int width);
#ifdef TITLEBARQWidget *getTitleBar();void onMinClick();void onMaxClick();void onCloseClick();
#endif
private:bool onHoverEvent(QObject *watched,QHoverEvent *event);bool onDbClickEvent(QMouseEvent *event);bool onMousePressEvent(QMouseEvent *event);bool onMoveEvent(QMouseEvent *event);bool onMouseReleaseEvent(QMouseEvent *event);QRect calMaxMoveRect(const QPoint &evPos);//代理窗口QWidget *m_widget;//预拖动窗口TransparentRect *m_transparentRect;enum WidgetOperator m_widgetOperator;bool m_isMove;
#ifdef TITLEBARTitleBar *m_titleBar;
#endif
};
#endif // FRAMELESSHELPER_H

#include "titleBar.h"
#include <QIcon>
#include <QPalette>int iconSize=30;TitleBar::TitleBar(QWidget *parent,bool isMax): QWidget{parent}, m_minBtn{new QPushButton(this)}, m_maxBtn{new QPushButton(this)}, m_closeBtn{new QPushButton(this)}, m_hLayout{new QHBoxLayout(this)}, m_spacer{new QSpacerItem(500,30,QSizePolicy::Expanding)}, m_isMax{isMax}
{m_minBtn->setIcon(QIcon(":/img/min.png"));QString maxPic = m_isMax?":/img/normal.png":":/img/max.png";m_maxBtn->setIcon(QIcon(maxPic));m_closeBtn->setIcon(QIcon(":/img/close.png"));connect(m_minBtn,&QPushButton::clicked,this,&TitleBar::minimumSizeClick);connect(m_maxBtn,&QPushButton::clicked,this,&TitleBar::showNormalClick);connect(m_maxBtn,&QPushButton::clicked,this,&TitleBar::onMaxClick);connect(m_closeBtn,&QPushButton::clicked,this,&TitleBar::closeClick);m_minBtn->resize(iconSize,iconSize);m_maxBtn->resize(iconSize,iconSize);m_maxBtn->resize(iconSize,iconSize);m_hLayout->addSpacerItem(m_spacer);m_hLayout->addWidget(m_minBtn);m_hLayout->addWidget(m_maxBtn);m_hLayout->addWidget(m_closeBtn);m_hLayout->setSpacing(0);m_hLayout->setContentsMargins(0,0,0,0);QPalette palette(this->palette());palette.setColor(QPalette::Background, QColor(100,100,100));this->setAutoFillBackground(true);this->setPalette(palette);
}void TitleBar::onMaxClick()
{if(m_isMax){m_maxBtn->setIcon(QIcon(":/img/max.png"));m_isMax=false;}else{m_maxBtn->setIcon(QIcon(":/img/normal.png"));m_isMax=true;}
}

#ifndef TITLEBAR_H
#define TITLEBAR_H#include <QWidget>
#include <QPushButton>
#include <QHBoxLayout>
#include <QSpacerItem>class TitleBar : public QWidget
{Q_OBJECT
public:explicit TitleBar(QWidget *parent = nullptr,bool isMax=false);void onMaxClick();
signals:void minimumSizeClick();void showNormalClick();void closeClick();private:QPushButton *m_minBtn;QPushButton *m_maxBtn;QPushButton *m_closeBtn;QHBoxLayout *m_hLayout;QSpacerItem *m_spacer;bool m_isMax;
};#endif // TITLEBAR_H

#include "transparentRect.h"
#include "framelessData.h"
#include <QMouseEvent>
#include <QDesktopWidget>
#include <QDebug>
#include <QPainter>
#include <QPen>
#include <QScreen>
#include <QGuiApplication>
#include <QList>TransparentRect::TransparentRect(QWidget *parent): QWidget(parent), m_areaType(AreaType::None)
{setWindowFlag(Qt::FramelessWindowHint);setAttribute(Qt::WA_TranslucentBackground);
}void TransparentRect::setRect(const QRect &rect)
{m_rect=rect;
}QRect TransparentRect::getRect() const
{return m_rect;
}void TransparentRect::onMousePressEvent(QMouseEvent *event,AreaType type)
{m_lastPos = event->pos();//auto screens = QGuiApplication::screens();QRect rect;//QPainter painter(&m_pixmap);for(auto s:screens){auto geom = s->geometry();rect |= geom;//auto pixmap = s->grabWindow(0, geom.x(), geom.y(), geom.width(), geom.height());//static int i = 0;//QFile file(QString("./test%1.png").arg(i++));//file.open(QIODevice::WriteOnly);//pixmap.save(&file);//file.close();//painter.drawPixmap(s->geometry(), pixmap);}//painter.end();m_startInch = QGuiApplication::screenAt(event->globalPos())->logicalDotsPerInch();setGeometry(rect);m_pixmap= QGuiApplication::primaryScreen()->grabWindow(0, rect.x(), rect.y(), rect.width(), rect.height());m_areaType = type;#if  0//QFile file("./test.png");file.open(QIODevice::WriteOnly);m_pixmap.save(&file);file.close();
#endif //  0
}void TransparentRect::onMoveEvent(QMouseEvent *event,const QPoint &newPos)
{m_scaled = QGuiApplication::screenAt(event->globalPos())->logicalDotsPerInch()/ m_startInch;//    auto newPos = event->pos();int xOff=0,yOff=0,wOff=0,hOff=0;int posXOff=newPos.x()-m_lastPos.x();int posYOff = newPos.y()-m_lastPos.y();switch (m_areaType) {case AreaType::LeftTopArea:xOff = posXOff;yOff = posYOff;break;case AreaType::TopArea:yOff = posYOff;break;case AreaType::RightTopArea:yOff = posYOff;wOff = posXOff;break;case AreaType::LeftArea:xOff = posXOff;break;case AreaType::RightArea:wOff = posXOff;break;case AreaType::LeftBottomArea:xOff = posXOff;hOff = posYOff;break;case AreaType::BottomArea:hOff = posYOff;break;case AreaType::RightBottomArea:wOff = posXOff;hOff = posYOff;break;case AreaType::TitleArea:   //movem_rect.moveTopLeft(m_rect.topLeft()+QPoint(posXOff,posYOff));break;default:break;}//min judget:if(m_rect.width()-xOff<=FrameLessData::minWidth)xOff=0;else if(m_rect.left()<event->globalPos().x() && xOff<0)xOff=0;if(m_rect.width()+wOff<=FrameLessData::minWidth)wOff=0;else if(m_rect.right()>event->globalPos().x() && wOff>0)wOff=0;if(m_rect.height()-yOff<=FrameLessData::minHeight)yOff=0;else if(m_rect.top()<event->globalPos().y() && yOff<0)yOff=0;if(m_rect.height()+hOff<=FrameLessData::minHeight)hOff=0;else if(m_rect.bottom()>event->globalPos().y() && hOff>0)hOff=0;//resize:m_rect.setTop(m_rect.top()+yOff);m_rect.setLeft(m_rect.left()+xOff);m_rect.setWidth(m_rect.width()+wOff);m_rect.setHeight(m_rect.height()+hOff);m_lastPos = newPos;update();
}void TransparentRect::onMouseReleaseEvent(QMouseEvent *event)
{m_areaType=AreaType::None;//释放pixmap，m_pixmap = QPixmap();//重绘，触发paintEvent，否则会有闪动，//注意要在hide之前调用。repaint();
}void TransparentRect::paintEvent(QPaintEvent *event)
{QPainter painter(this);painter.setRenderHints(QPainter::SmoothPixmapTransform | QPainter::HighQualityAntialiasing | QPainter::Antialiasing);painter.setBackground(FrameLessData::transparentRectBkground);painter.drawPixmap(0, 0, m_pixmap);QPen pen(FrameLessData::borderStyle);pen.setWidth(FrameLessData::borderThickness);pen.setColor(FrameLessData::borderColor);painter.setPen(pen);//背景色取反，要求color必须是whitepainter.setCompositionMode(QPainter::RasterOp_SourceAndNotDestination);//rect位置相对与this的geometryauto rect=m_rect;rect.moveTopLeft(rect.topLeft()-geometry().topLeft());rect.setWidth(rect.width()*m_scaled);rect.setHeight(rect.height()*m_scaled);painter.drawRect(rect);painter.end();
}

#ifndef TRANSPARENTRECT_H
#define TRANSPARENTRECT_H
#include <QWidget>
#include "framelessData.h"class TransparentRect : public QWidget
{Q_OBJECT
public:TransparentRect(QWidget *parent=nullptr);void setRect(const QRect &rect);QRect getRect() const;void onMousePressEvent(QMouseEvent *event,AreaType type);void onMoveEvent(QMouseEvent *event,const QPoint &pos);void onMouseReleaseEvent(QMouseEvent *event);
protected:virtual void paintEvent(QPaintEvent *event) override;
private:QRect m_rect;QPoint m_lastPos;AreaType m_areaType;QPixmap m_pixmap;double m_scaled=1.0;double m_startInch;
};#endif // TRANSPARENTRECT_H

cmake_minimum_required(VERSION 3.5)project(frameLessHelper VERSION 0.1 LANGUAGES CXX)add_definitions(-DTITLEBAR)
#add_definitions(-DRUBBER)set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets WebEngineWidgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets WebEngineWidgets)file(GLOB  PROJECT_SOURCES  "*.cpp" "*.h" "*.ui" "framelessHelper/*.*")if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)qt_add_executable(frameLessHelperMANUAL_FINALIZATION${PROJECT_SOURCES})
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET frameLessHelper APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()if(ANDROID)add_library(frameLessHelper SHARED${PROJECT_SOURCES})
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")else()add_executable(frameLessHelper${PROJECT_SOURCES}framelessHelper/titleBarImg.qrcwebview.h webview.cpp)endif()
endif()target_link_libraries(frameLessHelper PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::WebEngineWidgets)set_target_properties(frameLessHelper PROPERTIESMACOSX_BUNDLE_GUI_IDENTIFIER my.example.comMACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}MACOSX_BUNDLE TRUEWIN32_EXECUTABLE TRUE
)install(TARGETS frameLessHelperBUNDLE DESTINATION .LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)if(QT_VERSION_MAJOR EQUAL 6)qt_finalize_executable(frameLessHelper)
endif()

#include "mainwindow.h"
#include "./ui_mainwindow.h"
#include <QGridLayout>
#include <QWebEngineView>
#include <QFrame>
#include "webview.h"
#include <QDebug>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow), m_frameHelper(new FrameLessHelper(this))
{ui->setupUi(this);setWindowFlags(Qt::FramelessWindowHint);installEventFilter(this);
#ifdef TITLEBAR//titleBarauto titleBar = m_frameHelper->getTitleBar();if(titleBar){QGridLayout *layout = new QGridLayout(centralWidget());layout->setSpacing(0);layout->setContentsMargins(0,0,0,0);layout->addWidget(titleBar,0,0,0,0,Qt::AlignTop);titleBar->setFixedHeight(32);#if 0WebView *view = new WebView();view->load(QUrl("https:www.baidu.com"));auto childs =  view->children();for(auto child:childs){
//            if(child->metaObject()->className()==QString("QtWebEngineCore::RenderWidgetHostViewQtDelegateWidget"))child->installEventFilter(this);}view->installEventFilter(this);
#elseQFrame *view = new QFrame();
#endiflayout->addWidget(view,1,0);}setMouseTracking(true);
#endif
}MainWindow::~MainWindow()
{delete ui;
}bool MainWindow::eventFilter(QObject *watched, QEvent *event)
{return m_frameHelper->eventFilter(watched,event);
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include "framelessHelper/framelessHelper.h"QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();bool eventFilter(QObject *watched, QEvent *event) override;
private:Ui::MainWindow *ui;FrameLessHelper *m_frameHelper;
};
#endif // MAINWINDOW_H

源码：

https://download.csdn.net/download/weixin_40953784/88248380