Qt-demo高级感无边框窗口、美化基础控件

展示：

代码实现：

// 鼠标按下事件(记录拉伸窗口或移动窗口时的起始坐标（左上角）)
void framelessWidget::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton){
        mousePressed = true;
#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
        lastPos = event->globalPosition().toPoint() - this->frameGeometry().topLeft();
#else
        lastPos = event->globalPos() - this->frameGeometry().topLeft();
#endif
    }
}

// 鼠标移动事件
void framelessWidget::mouseMoveEvent(QMouseEvent *event)
{
    if(event->buttons() == Qt::NoButton)
        mousePressed = false;
    if(!mousePressed){ // 鼠标没按下移动，更新鼠标位置状态
        mouseState = 0;
        if(!maximized && abs(event->pos().x() - ui->mainWidget->pos().x()) < 5)
            mouseState |= AT_LEFT;
        if(!maximized && abs(event->pos().y() - ui->mainWidget->pos().y()) < 5)
            mouseState |= AT_TOP;
        if(!maximized && abs(event->pos().x() - ui->mainWidget->pos().x() - ui->mainWidget->width()) < 5)
            mouseState |= AT_RIGHT;
        if(!maximized && abs(event->pos().y() - ui->mainWidget->pos().y() - ui->mainWidget->height()) < 5)
            mouseState |= AT_BOTTOM;
        if(mouseState == AT_TOP_LEFT  || mouseState == AT_BOTTOM_RIGHT)
            setCursor(Qt::SizeFDiagCursor);
        else if(mouseState == AT_TOP_RIGHT || mouseState == AT_BOTTOM_LEFT)
            setCursor(Qt::SizeBDiagCursor);
        else if(mouseState & (AT_LEFT | AT_RIGHT))
            setCursor(Qt::SizeHorCursor);
        else if(mouseState & (AT_TOP | AT_BOTTOM))
            setCursor(Qt::SizeVerCursor);
        else
            unsetCursor();
    }
    else{ //鼠标按下移动
        if(mouseState == 0){
            if(maximized){
                qreal wRatio = (double)event->pos().x() / (double)ui->mainWidget->width();
                controlWindowScale();
#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
                this->move(QPoint(event->globalPosition().x() - ui->mainWidget->width() * wRatio, -30));
#else
                this->move(QPoint(event->globalPos().x() - ui->mainWidget->width() * wRatio, -30));
#endif
                lastPos = QPoint(ui->mainWidget->width() * wRatio, event->pos().y());
            }
            else
#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
                this->move(event->globalPosition().toPoint() - lastPos);
#else
                this->move(event->globalPos() - lastPos);
#endif
        }
        else{
#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
            QPoint d = event->globalPosition().toPoint() - frameGeometry().topLeft() - lastPos;
#else
            QPoint d = event->globalPos() - frameGeometry().topLeft() - lastPos;
#endif
            if(mouseState & AT_LEFT){
                this->move(this->frameGeometry().x() + d.x(), this->frameGeometry().y());
                this->resize(this->width() - d.x(), this->height());
            }
            if(mouseState & AT_RIGHT){
                this->resize(this->width() + d.x(), this->height());
            }
            if(mouseState & AT_TOP){
                this->move(this->frameGeometry().x(), this->frameGeometry().y() + d.y());
                this->resize(this->width(), this->height() - d.y());
            }
            if(mouseState & AT_BOTTOM){
                this->resize(this->width(), this->height() + d.y());
            }
        }
#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
        lastPos = event->globalPosition().toPoint() - this->frameGeometry().topLeft();
#else
        lastPos = event->globalPos() - this->frameGeometry().topLeft();
#endif
    }
}

// 窗口变化事件
void framelessWidget::resizeEvent(QResizeEvent *event)
{
    //Resize border
    if(border)
        border->resize(ui->mainWidget->size() + QSize(2, 2));

    //Resize mask
    QPainterPath path;
#ifdef Q_OS_WINDOWS
    path.addRoundedRect(ui->mainWidget->rect(), cornerRadius - 1, cornerRadius - 1);
#else
    path.addRect(ui->mainWidget->rect());
#endif
    QRegion mask(path.toFillPolygon().toPolygon());
    ui->mainWidget->setMask(mask);

    //Resize all pages
//    for(int i = 0; i < pageList.size(); i++){
//        pageList[i]->resize(ui->mainWidget->width() * 0.4 < pageList[i]->preferWidth ? pageList[i]->preferWidth - 1 : ui->mainWidget->width() * 0.4 - 1, ui->mainWidget->height());
//        pageList[i]->resize(pageList[i]->width() + 1, pageList[i]->height());
//    }
}

//点击最大化按钮事件
void framelessWidget::controlWindowScale(){
#ifdef Q_OS_WINDOWS
    if(!maximized){
        lastGeometry = this->frameGeometry();
      //  windowShadow->setEnabled(false);
        ui->verticalLayout->setContentsMargins(0, 0, 0, 0);
        border->hide();
        QString mainStyle = "QWidget#mainWidget{background-color:rgb(251,251,251) border-radius:0px;}";
        ui->mainWidget->setStyleSheet(mainStyle);
        this->showMaximized();
        maximized = true;
        QPainterPath path;
        path.addRect(ui->mainWidget->rect());
        QRegion mask(path.toFillPolygon().toPolygon());
        ui->mainWidget->setMask(mask);
    }
    else{
        ui->verticalLayout->setContentsMargins(30, 30, 30, 30);
        this->showNormal();
        QString mainStyle = "QWidget#mainWidget{background-color:rgb(251,251,251)" + QString::asprintf(";border-radius:%dpx", cornerRadius) + "}";
        ui->mainWidget->setStyleSheet(mainStyle);
        QPainterPath path;
        path.addRoundedRect(ui->mainWidget->rect(), cornerRadius - 1, cornerRadius - 1);
        QRegion mask(path.toFillPolygon().toPolygon());
        ui->mainWidget->setMask(mask);
        border->show();
     //   windowShadow->setEnabled(true);
        this->resize(lastGeometry.width(), lastGeometry.height());
        this->move(lastGeometry.x(), lastGeometry.y());
        maximized = false;
    }
#endif
}

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