Qt自定义标题栏

效果如下：

代码如下：

// widget.h
#ifndef WIDGET_H
#define WIDGET_H

#include 

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
protected:
    bool nativeEvent(const QByteArray&eventType,void *message,long*result) override;
private slots:
    void on_close();

private:
    void mousePressEvent(QMouseEvent*ev);
    void mouseMoveEvent(QMouseEvent*ev);
    QPoint pos;
private:
    Ui::Widget *ui;

    int m_BorderWidth  =5;
};

//2、titlebar
#ifndef CTABTITLEWIDGET_H
#define CTABTITLEWIDGET_H

#include 
#include 
#include

class CTabTitleWidget : public QWidget
{
    Q_OBJECT
public:
    explicit CTabTitleWidget(QWidget *parent = nullptr);
    ~CTabTitleWidget();

    void setEmptyWidgetWidth(int w);

protected:
    void paintEvent(QPaintEvent*event);
    void mousePressEvent(QMouseEvent*ev);
    void mouseDoubleClickEvent(QMouseEvent*event);


signals:
    void sig_close();
    void sig_addtab();
private slots:
    void on_clicked();

private:
    QPushButton* m_pAddBtn = nullptr;
    QWidget*     m_pEmptyWidget = nullptr;
    QPushButton* m_pUserBtn = nullptr;
    QPushButton* m_pMinBtn = nullptr;
    QPushButton* m_pMaxBtn = nullptr;
    QPushButton* m_pCloseBtn = nullptr;
};

#endif // CTABTITLEWIDGET_H

#endif // WIDGET_H

//3.tabbrowser
#ifndef TABBROWSER_H
#define TABBROWSER_H

#include 
#include 
#include 
#include 
#include "ctabtitlewidget.h"
class tabbrowser : public QTabWidget
{
    Q_OBJECT
public:
    explicit tabbrowser(QWidget *parent = nullptr);

    enum TAB_FLAG
    {
        NEW,
        CLOSE,
        NORMAL,
        SPECIAL
    };

protected:
    void resizeEvent(QResizeEvent*ev) override;

private:
    void initTabWidget();
    void setTabBarFlag(TAB_FLAG);
    void createTabMenu();

private slots:
    void on_newTab();
    void on_closeTab(int index);
    void onMenuShow(const QPoint&pos);
    void on_closeAllTab();

private:
    CTabTitleWidget*m_pRightWidget = nullptr;
    QMenu* m_pTabMenu = nullptr;
signals:
    void sig_close();

};

#endif // TABBROWSER_H

.cpp
/./1.widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include "tabbrowser.h"
#ifdef Q_OS_WIN
#include 
#include 
#include 
#include 
#include 
#endif

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    // 设置窗口为无边框
    setWindowFlag(Qt::FramelessWindowHint);
    setStyleSheet("background-color:#E3E4E7;");

    // 创建一个新的 tabbrowser 实例，并将其设置为此窗口的小部件
    tabbrowser* pTab = new tabbrowser(this);

    // 创建一个水平布局，并将 tabbrowser 添加到布局中
    QHBoxLayout* pHLay = new QHBoxLayout(this);
    pHLay->addWidget(pTab);
    pHLay->setContentsMargins(6, 6, 6, 6);
    setLayout(pHLay);

    // 连接 tabbrowser 的关闭信号到此窗口的 on_close 槽函数
    connect(pTab, &tabbrowser::sig_close, this, &Widget::on_close);
}

Widget::~Widget()
{
    delete ui;
}

// 处理自定义窗口行为的原生事件（例如，调整大小和移动）
bool Widget::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
    Q_UNUSED(eventType)

    MSG* param = static_cast(message);

    switch (param->message)
    {
    case WM_NCHITTEST:
    {
        int nX = GET_X_LPARAM(param->lParam) - this->geometry().x();
        int nY = GET_Y_LPARAM(param->lParam) - this->geometry().y();

        // 如果鼠标位于子控件上，则忽略此事件
        if (childAt(nX, nY) != nullptr)
            return QWidget::nativeEvent(eventType, message, result);

        // 当鼠标靠近边框时，进行调整大小操作
        if ((nX > 0) && (nX < m_BorderWidth))
            *result = HTLEFT;

        if ((nX > this->width() - m_BorderWidth) && (nX < this->width()))
            *result = HTRIGHT;

        if ((nY > 0) && (nY < m_BorderWidth))
            *result = HTTOP;

        if ((nY > this->height() - m_BorderWidth) && (nY < this->height()))
            *result = HTBOTTOM;

        if ((nX > 0) && (nX < m_BorderWidth) && (nY > 0) && (nY < m_BorderWidth))
            *result = HTTOPLEFT;

        if ((nX > this->width() - m_BorderWidth) && (nX < this->width()) && (nY > 0) && (nY < m_BorderWidth))
            *result = HTTOPRIGHT;

        if ((nX > 0) && (nX < m_BorderWidth) && (nY > this->height() - m_BorderWidth) && (nY < this->height()))
            *result = HTBOTTOMLEFT;

        if ((nX > this->width() - m_BorderWidth) && (nX < this->width()) && (nY > this->height() - m_BorderWidth) && (nY < this->height()))
            *result = HTBOTTOMRIGHT;

        return true;
    }
    }

    return QWidget::nativeEvent(eventType, message, result);
}

// 处理关闭信号的槽函数
void Widget::on_close()
{
    close();
}

// 处理鼠标按下事件以移动窗口
void Widget::mousePressEvent(QMouseEvent *ev)
{
    if (Qt::LeftButton == ev->button())
    {
        // 计算鼠标相对于窗口左上角的位置
        pos = ev->globalPos() - frameGeometry().topLeft();
        ev->accept();
    }
}

// 处理鼠标移动事件以移动窗口
void Widget::mouseMoveEvent(QMouseEvent *ev)
{
    if (Qt::LeftButton & ev->buttons())
    {
        // 移动窗口到鼠标移动后的位置
        move(ev->globalPos() - pos);
        ev->accept();
    }
}

//2.titlebar
#include “CTabTitleWidget.h”

#include
#include
#include
#include

#ifdef Q_OS_WIN
#include
#pragma comment(lib, “user32.lib”)
#endif
CTabTitleWidget::CTabTitleWidget(QWidget *parent)
: QWidget{parent}
{
setStyleSheet(“background-color:#E3E4E7”);
m_pAddBtn = new QPushButton(this);
m_pAddBtn->setFlat(true);
m_pAddBtn->setFixedSize(32, 32);
m_pAddBtn->setStyleSheet(“background-image:url(:/resources/add.svg)”);

m_pEmptyWidget = new QWidget(this);

m_pUserBtn = new QPushButton(this);
m_pUserBtn->setFlat(true);
m_pUserBtn->setFixedSize(32, 32);
m_pUserBtn->setStyleSheet("background-image:url(:/resources/user)");

m_pMinBtn = new QPushButton(this);
m_pMinBtn->setFlat(true);
m_pMinBtn->setFixedSize(32, 32);
m_pMinBtn->setStyleSheet("background-image:url(:/resources/min.svg)");

m_pMaxBtn = new QPushButton(this);
m_pMaxBtn->setFlat(true);
m_pMaxBtn->setFixedSize(32, 32);
m_pMaxBtn->setStyleSheet("background-image:url(:/resources/max.svg)");

m_pCloseBtn = new QPushButton(this);
m_pCloseBtn->setFlat(true);
m_pCloseBtn->setFixedSize(32, 32);
m_pCloseBtn->setStyleSheet("background-image:url(:/resources/close.svg)");

QHBoxLayout* pHLay = new QHBoxLayout(this);
pHLay->addWidget(m_pAddBtn);
pHLay->addWidget(m_pEmptyWidget);
this->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Expanding);
pHLay->addWidget(m_pUserBtn);
pHLay->addSpacing(8);
pHLay->addWidget(m_pMinBtn);
pHLay->addWidget(m_pMaxBtn);
pHLay->addWidget(m_pCloseBtn);
pHLay->setContentsMargins(1, 0, 1, 3);
setLayout(pHLay);

connect(m_pAddBtn, &QPushButton::clicked, this, &CTabTitleWidget::on_clicked);
connect(m_pMinBtn, &QPushButton::clicked, this, &CTabTitleWidget::on_clicked);
connect(m_pMaxBtn, &QPushButton::clicked, this, &CTabTitleWidget::on_clicked);
connect(m_pCloseBtn, &QPushButton::clicked, this, &CTabTitleWidget::on_clicked);

}

CTabTitleWidget::~CTabTitleWidget()
{

}

void CTabTitleWidget::setEmptyWidgetWidth(int w)
{
m_pEmptyWidget->setMinimumWidth(w);
}

void CTabTitleWidget::paintEvent(QPaintEvent *event)
{
QStyleOption opt;
opt.init(this);
QPainter p(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
QWidget::paintEvent(event);
}

void CTabTitleWidget::mousePressEvent(QMouseEvent ev)
{
if(ReleaseCapture())
{
QWidgetwin = this->window();
if(win->isTopLevel())
{
SendMessage(HWND(win->winId()),WM_SYSCOMMAND,SC_MOVE+HTCAPTION,0);
}
}
ev->ignore();
}

void CTabTitleWidget::mouseDoubleClickEvent(QMouseEvent *event)
{
emit m_pMaxBtn->clicked();
}

void CTabTitleWidget::on_clicked()
{
QPushButtonbtn = qobject_cast>(sender());
QWidget*win = this->window();
if(win->isTopLevel())
{
if (btn == m_pAddBtn)
{
emit sig_addtab();
}
else if (btn == m_pMinBtn)
{
win->showMinimized();
}
else if (btn == m_pMaxBtn)
{
win->isMaximized() ? win->showNormal() : win->showMaximized();
}
else if (btn == m_pCloseBtn)
{
emit sig_close();
}
}
}
//3.tabbrowser
#include “tabbrowser.h”
#include
#include
#include
#include
#include

QString qss1 = "QTabBar::tab{ \
font: 75 12pt Arial; \
text-align:left; \
width:184px; \
height:32; \
background:#FFFFFF; \
border:2px solid #FFFFFF; \
border-bottom-color:#FFFFFF; \
border-top-left-radius:4px; \
border-top-right-radius:4px; \
padding:2px; \
margin-top:0px; \
margin-right:1px; \
margin-left:1px;  \
margin-bottom:0px;} \
QTabBar::tab:selected{  \
    color:#333333; /*文字颜色*/  \
        background-color:#FFFFFF;} \
QTabBar::tab:!selected{ \
    color:#B2B2B2; \
    border-color:#FFFFFF;} \
QTabBar::scroller{width: 36px;}";

initTabWidget();
setTabBarFlag(NORMAL);

this->setStyleSheet(qss0);

connect(this, &QTabWidget::tabCloseRequested,this, &tabbrowser::on_closeTab);

m_pRightWidget = new CTabTitleWidget(this);

this->setCornerWidget(m_pRightWidget, Qt::TopRightCorner);
connect(m_pRightWidget, &CTabTitleWidget::sig_addtab, this, &tabbrowser::on_newTab);
connect(m_pRightWidget, &CTabTitleWidget::sig_close, this, &tabbrowser::sig_close);

int tabsWidth = 0;  //所有tab的总宽度
int tabsHeight = tabBar()->height();
int tabs = this->count();

if (flag == NEW || flag == NORMAL)
{
    for (int i = 0; i < tabs; ++i)
    {
        tabsWidth += tabBar()->tabRect(i).width();
    }
}
else
{
    for (int i = 0;i < tabs - 1;++i)
    {
        tabsWidth += tabBar()->tabRect(i).width();
    }
}

if (w > tabsWidth)
{
    m_pRightWidget->setEmptyWidgetWidth(w - tabsWidth - 32 * 5 - 15);
    this->setStyleSheet(qss0);
}
else
{
    //当所有tab的宽度大于整个tabWidget的宽时
    m_pRightWidget->setEmptyWidgetWidth(150);
    this->setStyleSheet(qss1);
}

QAction* pAcSave = new QAction(QIcon(":/resources/save.png"), u8"保存", m_pTabMenu);
m_pTabMenu->addAction(pAcSave);

connect(pAcSave, &QAction::triggered, [=] {
    QMessageBox::information(this, u8"提示", u8"你点击了 保存");
    });

QAction* pAcSaveAs = new QAction(QString(u8"另存为"), m_pTabMenu);
m_pTabMenu->addAction(pAcSaveAs);

m_pTabMenu->addSeparator();

QAction* pAcShareDoc = new QAction(QIcon(":/resources/share.png"), QString(u8"分享文档"), m_pTabMenu);
m_pTabMenu->addAction(pAcShareDoc);

QAction* pAcSendToDevice = new QAction(QString(u8"发送到设备"), m_pTabMenu);
m_pTabMenu->addAction(pAcSendToDevice);

m_pTabMenu->addSeparator();

QAction* pAcNewName = new QAction(QString(u8"重命名"), m_pTabMenu);
m_pTabMenu->addAction(pAcNewName);

QAction* pAcSaveToWPSCloud = new QAction(QString(u8"保存到WPS云文档"), m_pTabMenu);
m_pTabMenu->addAction(pAcSaveToWPSCloud);

QAction* pAcCloseAll = new QAction(QString(u8"关闭所有文件"), m_pTabMenu);
m_pTabMenu->addAction(pAcCloseAll);
connect(pAcCloseAll, &QAction::triggered, this, &tabbrowser::on_closeAllTab);

// 这里写的有问题，应该是 insertTab
this->addTab(new QWidget, title);

if (!tabsClosable())
{
    setTabsClosable(true);
}

setTabBarFlag(NEW);

//当只剩下1个tab时
if (count() == 1)
{
    setTabsClosable(false);
    setTabBarFlag(SPECIAL);
}

if (index != -1)
{
  m_pTabMenu->exec(QCursor::pos());
}