Qt之自定义界面(添加自定义标题栏)

效果
这里写图片描述

自定义标题栏
实现
头文件

title_bar.h

#ifndef TITLE_BAR
#define TITLE_BAR

#include 

class QLabel;
class QPushButton;

class TitleBar : public QWidget
{
    Q_OBJECT

public:
    explicit TitleBar(QWidget *parent = 0);
    ~TitleBar();

protected:

    // 双击标题栏进行界面的最大化/还原
    virtual void mouseDoubleClickEvent(QMouseEvent *event);

    // 进行鼠界面的拖动
    virtual void mousePressEvent(QMouseEvent *event);

    // 设置界面标题与图标
    virtual bool eventFilter(QObject *obj, QEvent *event);

private slots:

    // 进行最小化、最大化/还原、关闭操作
    void onClicked();

private:

    // 最大化/还原
    void updateMaximize();

private:
    QLabel *m_pIconLabel;
    QLabel *m_pTitleLabel;
    QPushButton *m_pMinimizeButton;
    QPushButton *m_pMaximizeButton;
    QPushButton *m_pCloseButton;
};

#endif // TITLE_BAR

cpp文件

title_bar.cpp

#include 
#include 
#include 
#include 
#include 
#include 
#include "title_bar.h"

#ifdef Q_OS_WIN
#pragma comment(lib, "user32.lib")
#include 
#endif

TitleBar::TitleBar(QWidget *parent)
    : QWidget(parent)
{
    setFixedHeight(30);

    m_pIconLabel = new QLabel(this);
    m_pTitleLabel = new QLabel(this);
    m_pMinimizeButton = new QPushButton(this);
    m_pMaximizeButton = new QPushButton(this);
    m_pCloseButton = new QPushButton(this);

    m_pIconLabel->setFixedSize(20, 20);
    m_pIconLabel->setScaledContents(true);

    m_pTitleLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

    m_pMinimizeButton->setFixedSize(27, 22);
    m_pMaximizeButton->setFixedSize(27, 22);
    m_pCloseButton->setFixedSize(27, 22);

    m_pTitleLabel->setObjectName("whiteLabel");
    m_pMinimizeButton->setObjectName("minimizeButton");
    m_pMaximizeButton->setObjectName("maximizeButton");
    m_pCloseButton->setObjectName("closeButton");

    m_pMinimizeButton->setToolTip("Minimize");
    m_pMaximizeButton->setToolTip("Maximize");
    m_pCloseButton->setToolTip("Close");

    QHBoxLayout *pLayout = new QHBoxLayout(this);
    pLayout->addWidget(m_pIconLabel);
    pLayout->addSpacing(5);
    pLayout->addWidget(m_pTitleLabel);
    pLayout->addWidget(m_pMinimizeButton);
    pLayout->addWidget(m_pMaximizeButton);
    pLayout->addWidget(m_pCloseButton);
    pLayout->setSpacing(0);
    pLayout->setContentsMargins(5, 0, 5, 0);

    setLayout(pLayout);

    connect(m_pMinimizeButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
    connect(m_pMaximizeButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
    connect(m_pCloseButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
}

TitleBar::~TitleBar()
{

}

void TitleBar::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_UNUSED(event);

    emit m_pMaximizeButton->clicked();
}

void TitleBar::mousePressEvent(QMouseEvent *event)
{
#ifdef Q_OS_WIN
    if (ReleaseCapture())
    {
        QWidget *pWindow = this->window();
        if (pWindow->isTopLevel())
        {
           SendMessage(HWND(pWindow->winId()), WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }
    }
       event->ignore();
#else
#endif
}

bool TitleBar::eventFilter(QObject *obj, QEvent *event)
{
    switch (event->type())
    {
    case QEvent::WindowTitleChange:
    {
        QWidget *pWidget = qobject_cast(obj);
        if (pWidget)
        {
            m_pTitleLabel->setText(pWidget->windowTitle());
            return true;
        }
    }
    case QEvent::WindowIconChange:
    {
        QWidget *pWidget = qobject_cast(obj);
        if (pWidget)
        {
            QIcon icon = pWidget->windowIcon();
            m_pIconLabel->setPixmap(icon.pixmap(m_pIconLabel->size()));
            return true;
        }
    }
    case QEvent::WindowStateChange:
    case QEvent::Resize:
        updateMaximize();
        return true;
    }
    return QWidget::eventFilter(obj, event);
}

void TitleBar::onClicked()
{
    QPushButton *pButton = qobject_cast(sender());
    QWidget *pWindow = this->window();
    if (pWindow->isTopLevel())
    {
        if (pButton == m_pMinimizeButton)
        {
            pWindow->showMinimized();
        }
        else if (pButton == m_pMaximizeButton)
        {
            pWindow->isMaximized() ? pWindow->showNormal() : pWindow->showMaximized();
        }
        else if (pButton == m_pCloseButton)
        {
            pWindow->close();
        }
    }
}

void TitleBar::updateMaximize()
{
    QWidget *pWindow = this->window();
    if (pWindow->isTopLevel())
    {
        bool bMaximize = pWindow->isMaximized();
        if (bMaximize)
        {
            m_pMaximizeButton->setToolTip(tr("Restore"));
            m_pMaximizeButton->setProperty("maximizeProperty", "restore");
        }
        else
        {
            m_pMaximizeButton->setProperty("maximizeProperty", "maximize");
            m_pMaximizeButton->setToolTip(tr("Maximize"));
        }

        m_pMaximizeButton->setStyle(QApplication::style());
    }
}

接口说明
mousePressEvent
之前,我们将界面移动的事件写在主界面里面,这会有一个问题,一般情况下,是界面随着标题栏的移动而移动,而并非界面中的所有位置都可以进行拖动,所以我们将事件写在标题栏中比较合理。

mouseDoubleClickEvent
双击标题栏会进行窗体的最大化/还原,所以我们需要重写此事件进行控制。

eventFilter

事件过滤器,这里被监听的窗体为标题栏所在的窗体,所以当窗体标题、图标等信息发生改变时,标题栏也应该随之改变。

最好不要通过直接调用接口的形式来操作对应的行为,比如:TitleBar中定义一个public函数来专门修改标题与图标,这样会造成不必要的麻烦,因为Qt本身就是基于事件的,所以此处采用过滤器的方式。

updateMaximize

因为窗体大小发生变化的时候,最大化的图标、提示应该对应的发生变化,所以在eventFilter中事件触发时调用。

使用方式

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    setWindowFlags(Qt::FramelessWindowHint | windowFlags());

    TitleBar *pTitleBar = new TitleBar(this);
    installEventFilter(pTitleBar);

    resize(400, 300);
    setWindowTitle("Custom Window");
    setWindowIcon(QIcon(":/Images/logo"));

    QPalette pal(palette());
    pal.setColor(QPalette::Background, QColor(50, 50, 50));
    setAutoFillBackground(true);
    setPalette(pal);

    QVBoxLayout *pLayout = new QVBoxLayout();
    pLayout->addWidget(pTitleBar);
    pLayout->addStretch();
    pLayout->setSpacing(0);
    pLayout->setContentsMargins(0, 0, 0, 0);
    setLayout(pLayout);
    }

注意

installEventFilter必须在setWindowTitle、setWindowIcon之前调用,因为必须先安装事件过滤器,相应事件触发时,才会进入标题栏的eventFilter事件中。

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