通俗來講，添加標題欄相當于添加一個控件
首先可以創建一個標題欄控件；
然后再創建一個widget，把MainWindow和標題欄控件通過布局加進去。
參考：Qt 之 自定義窗口標題欄
Qt自定義標題欄
標題欄控件：
TitleBar.h

#ifndef TITLEBAR_H #define TITLEBAR_H#include <QWidget> #include <QLabel> #include <QPushButton>/* 定義一個新的QWidget類,將標題欄和UI界面都放到這個類里面,定義這個類是為了方便改變主題 */ class WidgetPar : public QWidget {Q_OBJECT public:explicit WidgetPar(QWidget *parent = 0);signals:public slots://void paintEvent(QPaintEvent *event); };/* 自定義的標題欄類 */ class TitleBar : public QWidget {Q_OBJECT public:explicit TitleBar(QWidget *parent = 0);signals:public slots://右上角三個按鈕共用一個槽函數void on_TiBar_Clicked();protected://重寫鼠標事件virtual void mouseDoubleClickEvent(QMouseEvent *event);// 雙擊標題欄進行界面的最大化/還原virtual void mousePressEvent(QMouseEvent *event);// 進行鼠界面的拖動virtual bool eventFilter(QObject *obj, QEvent *event);// 設置界面標題與圖標// 標題欄跑馬燈效果時鐘;//QTimer m_titleRollTimer; private:void updateMaximize();// 最大化/還原private://自定義標題欄控件QLabel *TiBar_pIconLabel; //左上角圖標labelQLabel *TiBar_pTitleLabel; //中間標題欄labelQPushButton *TiBar_pMinimizeBtn; //右上角縮小到底部任務欄按鈕,最小化QPushButton *TiBar_pMaximizeBtn; //右上角放大縮小按鈕QPushButton *TiBar_pCloseBtn; //右上角關閉按鈕 public:};#endif // TITLEBAR_H

TitleBar.cpp

#include "titlebar.h" #include <QHBoxLayout> #include <QEvent> #include <QMouseEvent> #include <QApplication>#include <qt_windows.h> #include <QPainter>#include <QDebug> TitleBar::TitleBar(QWidget *parent) :QWidget(parent) {TiBar_pIconLabel = new QLabel;TiBar_pTitleLabel = new QLabel;TiBar_pMinimizeBtn = new QPushButton;TiBar_pMaximizeBtn = new QPushButton;TiBar_pCloseBtn = new QPushButton;TiBar_pIconLabel->setFixedSize(32, 32); //設置圖標固定大小TiBar_pIconLabel->setScaledContents(true); //設置圖片顯示合適大小TiBar_pTitleLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);//此屬性保存窗口小部件的默認布局行為。TiBar_pMinimizeBtn->setFixedSize(32, 32);//設置三個按鈕的固定大小TiBar_pMaximizeBtn->setFixedSize(32, 32);TiBar_pCloseBtn->setFixedSize(32, 32);TiBar_pTitleLabel->setFixedHeight(32);TiBar_pMinimizeBtn->setIcon(QIcon(":/image/image/small.ico"));TiBar_pMinimizeBtn->setIconSize(TiBar_pMinimizeBtn->size());TiBar_pMaximizeBtn->setIcon(QIcon(":/image/image/max.ico"));TiBar_pMaximizeBtn->setIconSize(TiBar_pMinimizeBtn->size());TiBar_pCloseBtn->setIcon(QIcon(":/image/image/close.ico"));TiBar_pCloseBtn->setIconSize(TiBar_pMinimizeBtn->size());QPixmap icon(":/image/image/lk.ico");TiBar_pIconLabel->setPixmap(icon);//TiBar_pIconLabel->resize(icon.width(),icon.height());TiBar_pTitleLabel->setObjectName("whiteLabel"); //此屬性保存此對象的名稱。TiBar_pMinimizeBtn->setObjectName("minimizeButton");TiBar_pMaximizeBtn->setObjectName("maximizeButton");TiBar_pCloseBtn->setObjectName("closeButton");TiBar_pMinimizeBtn->setToolTip("最小化"); //鼠標停留在上面的提示TiBar_pMaximizeBtn->setToolTip("放大/縮小");TiBar_pCloseBtn->setToolTip("關閉");QHBoxLayout *pLayout = new QHBoxLayout(this);pLayout->addWidget(TiBar_pIconLabel);//pLayout->addSpacing(5);pLayout->addWidget(TiBar_pTitleLabel);pLayout->addWidget(TiBar_pMinimizeBtn);pLayout->addWidget(TiBar_pMaximizeBtn);pLayout->addWidget(TiBar_pCloseBtn);pLayout->setSpacing(0);//設置控件之間的間距pLayout->setContentsMargins(0, 0, 0, 0);//設置左上右下的邊距this->setLayout(pLayout);connect(TiBar_pMinimizeBtn,SIGNAL(clicked()),this,SLOT(on_TiBar_Clicked()));connect(TiBar_pMaximizeBtn,SIGNAL(clicked()),this,SLOT(on_TiBar_Clicked()));connect(TiBar_pCloseBtn,SIGNAL(clicked()),this,SLOT(on_TiBar_Clicked())); } /* 標題欄右上角三個按鈕的槽函數*/ void TitleBar::on_TiBar_Clicked() {QPushButton *pBtn = qobject_cast<QPushButton *>(sender());//如果在由信號激活的槽中調用，則返回指向發送信號的對象的指針; 否則它返回0./* 返回此窗口小部件的窗口，即具有（或可能具有）窗口系統框架的下一個祖先窗口小部件。 如果窗口小部件是窗口，則返回窗口小部件本身。*/QWidget *pWindow = this->window();if (pWindow->isWindow())//如果窗口小部件是獨立窗口，則返回true，否則返回false。{if (pBtn == TiBar_pMinimizeBtn){pWindow->showMinimized();//最小化窗口小部件，作為圖標。調用此函數僅影響窗口。}else if (pBtn == TiBar_pMaximizeBtn){pWindow->isMaximized() ? pWindow->showNormal() : pWindow->showMaximized();//放大縮小}else if (pBtn == TiBar_pCloseBtn){pWindow->close();//關閉窗口}} }void TitleBar::mouseDoubleClickEvent(QMouseEvent *event) {Q_UNUSED(event);emit TiBar_pMaximizeBtn->clicked(); }void TitleBar::mousePressEvent(QMouseEvent *event) {if (ReleaseCapture()){QWidget *pWindow = this->window();if (pWindow->isWindow()){SendMessage(HWND(pWindow->winId()), WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);}}event->ignore(); }bool TitleBar::eventFilter(QObject *obj, QEvent *event) {switch (event->type()){case QEvent::WindowTitleChange:{QWidget *pWidget = qobject_cast<QWidget *>(obj);if (pWidget){TiBar_pTitleLabel->setText(pWidget->windowTitle());return true;}}case QEvent::WindowIconChange:{QWidget *pWidget = qobject_cast<QWidget *>(obj);if (pWidget){QIcon icon = pWidget->windowIcon();TiBar_pIconLabel->setPixmap(icon.pixmap(TiBar_pIconLabel->size()));return true;}}case QEvent::WindowStateChange:case QEvent::Resize://updateMaximize();return true;default:return false;}return QWidget::eventFilter(obj, event); } //窗口大小發生改變 void TitleBar::updateMaximize() {QWidget *pWindow = this->window();if (pWindow->isTopLevel()){bool bMaximize = pWindow->isMaximized();if (bMaximize){TiBar_pMaximizeBtn->setToolTip(tr("Restore"));TiBar_pMaximizeBtn->setProperty("maximizeProperty", "restore");}else{TiBar_pMaximizeBtn->setProperty("maximizeProperty", "maximize");TiBar_pMaximizeBtn->setToolTip(tr("Maximize"));}TiBar_pMaximizeBtn->setStyle(QApplication::style());} }WidgetPar::WidgetPar(QWidget *parent) :QWidget(parent) {}

MainWindow.cpp

#include <QGridLayout> #include "titlebar.h" #include "MainWindow.h" {ui->setupUi(this);WidgetPar *selMainWidget = new WidgetPar; //創建一個QWidget容器selMainWidget->setWindowFlags(Qt::FramelessWindowHint);//將這個QWidget的邊框去掉this->setParent(selMainWidget);//重新設置這個UI界面的父對象為QWidgetTitleBar *pTitleBar = new TitleBar(selMainWidget); //定義一個標題欄類//設置控件樣式//selMainWidget->setStyleSheet("background-color:#AFFFFF00");this->installEventFilter(pTitleBar);//安裝事件過濾器QGridLayout *pLayout = new QGridLayout();//創建一個整體布局器pLayout->addWidget(pTitleBar); //添加標題欄pLayout->addWidget(this); //添加UI界面pLayout->setSpacing(0); //布局之間的距離pLayout->setContentsMargins(0, 0, 0,0); //布局器的四周邊距selMainWidget->setLayout(pLayout); //將這個布局器設置在QWidget上selMainWidget->setAttribute(Qt::WA_TranslucentBackground, true);selMainWidget->setSizePolicy(this->sizePolicy());selMainWidget->setMaximumSize(this->maximumSize());selMainWidget->setMaximumSize(this->maximumSize());this->setWindowTitle(QString::fromLocal8Bit("標題"));selMainWidget->show();//顯示QWidge 最后添加 }

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