Qt跨平台无边框窗口探索记录

小黑屋10242023-08-25 10:00

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

  1. 8个方向的缩放
  2. 标题栏拖动
  3. 标题栏双击最大化/正常窗口
  4. 窗口最小尺寸
  5. 预操作框颜色与背景色互补
  6. 多屏幕
  7. 默认标题栏

1.2 待开发功能

  1. 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

  1. 首先关于无边框窗口，通过Qt标志处理：

    setWindowFlags(Qt::FramelessWindowHint);

  2. 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。

  1. 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:minsize
    auto w = size.width();
    auto h = size.height();
    auto x = pos.x();
    auto y = pos.y();
    //left
    if(x<=FrameLessData::borderThickness){
        if(y<=FrameLessData::borderThickness)
            return AreaType::LeftTopArea;
        else if(y>=h-FrameLessData::borderThickness)
            return AreaType::LeftBottomArea;
        else
            return AreaType::LeftArea;
    }//right
    else if(x>=w-FrameLessData::borderThickness){
        if(y<=FrameLessData::borderThickness)
            return AreaType::RightTopArea;
        else if(y>=h-FrameLessData::borderThickness)
            return AreaType::RightBottomArea;
        else
            return AreaType::RightArea;
    }
    else{//center
        if(y<=FrameLessData::borderThickness)
            return AreaType::TopArea;
        else if(y<=FrameLessData::titleHeight)
                return AreaType::TitleArea;
        else if(y>=h-FrameLessData::borderThickness)
            return AreaType::BottomArea;
        else
            return 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:   //move
        rect.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 title
    m_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 click
        ret = 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true
    if(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();
    else
        m_widget->showFullScreen();
}

void FrameLessHelper::onCloseClick()
{
    m_widget->close();
}
#endif
bool FrameLessHelper::onHoverEvent(QObject *watched,QHoverEvent *event)
{
    //操作的时候不响应hover
    if(m_widgetOperator!=WidgetOperator::None || m_widget->isFullScreen())
        return false;
    //hover move
    auto areatype = CursorTransform::calculateCursorType(m_widget->size(),event->pos());
    auto w=static_cast<QWidget *>(watched);
    if(w)
        w->setCursor(CursorTransform::AreaType2CursorShape(areatype));
    else
        m_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 TITLEBAR
        m_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){
        //resize
        m_widgetOperator = WidgetOperator::Resize;

        // not start show rect
        m_transparentRect->setRect(m_widget->frameGeometry());
        m_transparentRect->onMousePressEvent(event,type);

        return true;
    }
    else if(type==AreaType::TitleArea){
        //move
        m_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 TITLEBAR
    if(m_widget->isFullScreen())
        m_titleBar->onMaxClick();
#endif

    m_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 TITLEBAR
    QWidget *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 TITLEBAR
    TitleBar *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:   //move
        m_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white
    painter.setCompositionMode(QPainter::RasterOp_SourceAndNotDestination);
    //rect位置相对与this的geometry
    auto 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(frameLessHelper
        MANUAL_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.qrc
            webview.h webview.cpp



        )
    endif()
endif()

target_link_libraries(frameLessHelper PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::WebEngineWidgets)

set_target_properties(frameLessHelper PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

install(TARGETS frameLessHelper
    BUNDLE 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
    //titleBar
    auto 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 0
        WebView *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);
#else
        QFrame *view = new QFrame();
#endif
        layout->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_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    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

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