QT界面开发-(特效)无边框窗口+背景图片

转发自邵发《C/C++系列教程》Qt界面开发 https://chuanke.baidu.com/4509752-209060.html

1.自己用代码画界面

2.用Laber控件放一张背景大图

hpp

#include <QtWidgets>


private:
    virtual void paintEvent(QPaintEvent *event);

    virtual void mouseMoveEvent(QMouseEvent * event);
    virtual void mousePressEvent(QMouseEvent * event);
    virtual void mouseReleaseEvent(QMouseEvent * event);

    QPixmap m_imgTitle;

    bool m_dragging; // 是否正在拖动
    QPoint m_startPosition; // 拖动开始前的鼠标位置
    QPoint m_framePosition; // 窗体的原始位置

cpp

//写在ui.setupUi(this);下面
    m_dragging = false;

    // 不显示标题栏(亦无边框)
    setWindowFlags(Qt::Window | Qt::FramelessWindowHint);

    // 背景透明(全自画)
    setAttribute(Qt::WA_TranslucentBackground);

    // 标题图片
    m_imgTitle.load(":/Resources/title-bg.jpg");



void TestAandB::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    QRect frameRect = rect();
    frameRect.adjust(1, 1, -1, -1);

    // 自画背景和边框
    painter.setPen(QColor(0x66, 0x66, 0x66));
    painter.setBrush(QColor(0xFF, 0xFF, 0xFF));
    painter.drawRoundRect(frameRect, 2, 2);

    // 画标题栏
    QRect titleRect = frameRect;
    titleRect.setBottom(frameRect.top() + 80);

    QPainterPath path;
    path.addRoundedRect(frameRect.adjusted(1, 1, 0, -1), 2, 2);
    path.intersects(titleRect);
    painter.setClipPath(path);
    painter.drawPixmap(titleRect, m_imgTitle);

}

void TestAandB::mousePressEvent(QMouseEvent *event)
{
    // 只响应左键
    if (event->button() == Qt::LeftButton)
    {
        QRect titleRect = rect();
        titleRect.setBottom(titleRect.top() + 80);

        if (titleRect.contains(event->pos()))
        {
            m_dragging = true;
            m_startPosition = event->globalPos();
            m_framePosition = frameGeometry().topLeft();
        }
    }

    QWidget::mousePressEvent(event);
}

void TestAandB::mouseMoveEvent(QMouseEvent *event)
{
    // 只响应左键
    if (event->buttons() & Qt::LeftButton)
    {
        if (m_dragging)
        {
            // delta 相对偏移量, 
            QPoint delta = event->globalPos() - m_startPosition;

            // 新位置：窗体原始位置  + 偏移量
            move(m_framePosition + delta);
        }
    }

    QWidget::mouseMoveEvent(event);
}

void TestAandB::mouseReleaseEvent(QMouseEvent * event)
{
    m_dragging = false;
    QWidget::mouseReleaseEvent(event);
}

2020年1月2日

Caesar卢尚宇