Qt 自定义标题栏

实现

mititlebar.h

/**
* @brief         通用的标题栏控件
* @author        swang
* @date          2020-08-04
*/
#ifndef MITITLEBAR_H
#define MITITLEBAR_H

#include <QWidget>
class QPushButton;
class QLabel;
class MiTiTleBar : public QWidget
{
    Q_OBJECT
public:
    explicit MiTiTleBar(QWidget *parent = nullptr);

    void setTitleIcon   (const QString& imagePath)const;                      /*设置标题图片*/
    void setTitleText   (const QString& titleText)const;                      /*设置标题文字*/
    void setMaxBtnIcon  (const QString& imagePath)const;                      /*设置最大化按钮的图片*/
    void setMinBtnIcon  (const QString& imagePath)const;                      /*设置最小化按钮的图片*/
    void setCloseBtnIcon(const QString& imagePath)const;                      /*设置关闭按钮的图片*/
    void setTitleBg     (const QColor& color){m_color = color;update();}

protected:
    virtual void mouseDoubleClickEvent(QMouseEvent *event)override;           /*双击标题栏进行界面的最大化*/
    virtual bool eventFilter(QObject *obj, QEvent *event)override;            /*进行鼠界面的拖动*/

private slots:
    void on_btnClicked();

private:
    void initForm();
    void updateMaximize();/*最大化/还原*/

    QLabel     * m_pIconLbl;
    QLabel     * m_pTitleLbl;
    QPushButton* m_pMinBtn;
    QPushButton*  m_pMaxBtn;
    QPushButton* m_pCloseBtn;

    QColor       m_color;
};

#endif // MITITLEBAR_H

mititlebar.cpp

/**
* @brief         通用的标题栏
* @author        swang
* @date          2020-08-04
*/

#include <QPushButton>
#include <QLabel>
#include <QPainter>
#include <QHBoxLayout>
#include <QDebug>
#include <QMouseEvent>

#include "mititlebar.h"

MiTiTleBar::MiTiTleBar(QWidget *parent)
    : QWidget(parent)
{
    m_color = QColor(50,50,50,153);

    installEventFilter(this);
    initForm();
}

/**
* @author        swang
* @date          2020-08-04
* @brief         初始化标题栏样式
*/
void MiTiTleBar::initForm()
{
    const QSize btnSize(32,32);
    const QSize iconSize(24,24);

    m_pIconLbl  = new QLabel;
    m_pTitleLbl = new QLabel;
    m_pMinBtn   = new QPushButton;
    m_pMaxBtn   = new QPushButton;
    m_pCloseBtn = new QPushButton;
    this->setObjectName("MiTitle");
    m_pCloseBtn->setObjectName("titleClose");
    m_pIconLbl->setFixedSize(btnSize);
    m_pIconLbl->setScaledContents(true);

    m_pTitleLbl->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

    m_pMinBtn->setFixedSize(btnSize);
    m_pMaxBtn->setFixedSize(btnSize);
    m_pCloseBtn->setFixedSize(btnSize);

    m_pCloseBtn->setIconSize(iconSize);
    m_pMaxBtn->setIconSize(iconSize);
    m_pMinBtn->setIconSize(iconSize);

    QHBoxLayout *pLayout = new QHBoxLayout(this);
    pLayout->addWidget(m_pIconLbl);
    pLayout->addSpacing(0);
    pLayout->addWidget(m_pTitleLbl);
    pLayout->addWidget(m_pMinBtn);
    pLayout->addWidget(m_pMaxBtn);
    pLayout->addWidget(m_pCloseBtn);
    pLayout->setSpacing(0);
    pLayout->setContentsMargins(0, 0, 0, 0);//左上右下
    setLayout(pLayout);
    connect(m_pMinBtn,&QPushButton::clicked,this,&MiTiTleBar::on_btnClicked);
    connect(m_pMaxBtn,&QPushButton::clicked,this,&MiTiTleBar::on_btnClicked);
    connect(m_pCloseBtn,&QPushButton::clicked,this,&MiTiTleBar::on_btnClicked);
    this->setStyleSheet("QWidget{background-color:rgba(50,50,50,153);}QPushButton{border:none;}"
                        "QPushButton::hover{background-color:rgba(26,26,26,153);}"
                        "QPushButton#titleClose::hover{background-color:rgba(220,20,60,200);}");
}


/**
* @author        swang
* @date          2020-08-04
* @brief         最大化/还原
*/
void MiTiTleBar::updateMaximize()
{
    QWidget *pWindow = this->window();
    if (pWindow->isTopLevel())
    {
        bool bMaximize = pWindow->isMaximized();
        if (bMaximize)
        {
            m_pMaxBtn->setToolTip(tr("还原"));
        }
        else
        {
            m_pMaxBtn->setToolTip(tr("最大化"));
        }
    }
}

/**
* @author        swang
* @date          2020-08-04
* @brief         双击标题栏进行界面的最大化/还原
* @parameter     [event]:鼠标双击事件
*/
void MiTiTleBar::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_UNUSED(event);
    emit m_pMaxBtn->clicked();
}

/**
* @author        swang
* @date          2020-08-04
* @brief         进行鼠界面的拖动
* @parameter     [obj]:接受事件的对象 | [event]待处理的事件
*/
bool MiTiTleBar::eventFilter(QObject *obj, QEvent *evt)
{

    QWidget *pWindow = this->window();
    static QPoint mousePoint;
    static bool mousePressed = false;
    QMouseEvent *event = static_cast<QMouseEvent *>(evt);
    if(obj->objectName()=="MiTitle"){
        if (event->type() == QEvent::MouseButtonPress) {
            if (event->button() == Qt::LeftButton) {
                mousePressed = true;
                mousePoint = event->globalPos() - pWindow->pos();
                return true;
            }
        } else if (event->type() == QEvent::MouseButtonRelease) {
            mousePressed = false;
            return true;
        } else if (event->type() == QEvent::MouseMove) {
            if (mousePressed && (event->buttons() & Qt::LeftButton)) {
                pWindow->move(event->globalPos() - mousePoint);
                return true;
            }
        }
    }
    return QWidget::eventFilter(obj,evt);

}

/**
        * @author        swang
        * @date          2020-08-04
        * @brief         响应点击事件
        */
void MiTiTleBar::on_btnClicked()
{
    QPushButton *pButton = qobject_cast<QPushButton *>(sender());
    QWidget *pWindow = this->window();
    if (pWindow->isTopLevel())
    {
        if (pButton == m_pMinBtn)
        {
            pWindow->showMinimized();
        }
        else if (pButton == m_pMaxBtn)
        {
            pWindow->isMaximized() ? pWindow->showNormal() : pWindow->showMaximized();
        }
        else if (pButton == m_pCloseBtn)
        {
            pWindow->close();
        }
    }

}


void MiTiTleBar::setTitleIcon(const QString &imagePath)const
{
    QPixmap image(imagePath);      //保持长宽比          //平滑转换
    QPixmap fitpixmap=image.scaled(m_pIconLbl->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    m_pIconLbl->setPixmap(fitpixmap);
}

void MiTiTleBar::setTitleText(const QString &titleText) const
{
    m_pTitleLbl->setText(titleText);
}

void MiTiTleBar::setMaxBtnIcon(const QString &imagePath) const
{
    QPixmap image(imagePath);      //保持长宽比          //平滑转换
    QPixmap fitpixmap=image.scaled(m_pMaxBtn->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    m_pMaxBtn->setIcon(QIcon(fitpixmap));
}

void MiTiTleBar::setMinBtnIcon(const QString &imagePath) const
{
    QPixmap image(imagePath);
    QPixmap fitpixmap=image.scaled(m_pMinBtn->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    m_pMinBtn->setIcon(QIcon(fitpixmap));
}

void MiTiTleBar::setCloseBtnIcon(const QString &imagePath) const
{
    QPixmap image(imagePath);
    QPixmap fitpixmap=image.scaled(m_pCloseBtn->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    m_pCloseBtn->setIcon(QIcon(fitpixmap));
}

 

调用：

void Widget:: initForm()
{
    setWindowFlags(Qt::FramelessWindowHint);
    QVBoxLayout * pVbox = new QVBoxLayout;
    MiTiTleBar* pTitleBar = new MiTiTleBar;
    pVbox->setContentsMargins(0,0,0,0);
    pVbox->addWidget(pTitleBar);
    pVbox->addStretch();
    this->setLayout(pVbox);
    this->installEventFilter(pTitleBar);
}