QTabWidget添加自定义的按钮

原本的QTabWidget没有支持在标签后面添加自定义的按钮的方法。想在后面添加自定义的功能按钮需要重写QTabWidget类，自己实现按钮图标的重绘和鼠标点击判断等操作。

1、使用到的主要事件函数：

（1） void paintEvent(QPaintEvent* event);

用于在QTabWidget标签后面绘制操作按钮

（2）void mousePressEvent(QMouseEvent * event);

用于确定鼠标点击，判断点击时鼠标是否在绘制的图标上，在图标上则发出一个自定义的鼠标点击信号

（3）void mouseMoveEvent(QMouseEvent * event);

用于实现鼠标移动到操作按钮上方时，执行一些相关操作，如：toolTip提示、鼠标悬停效果切换等等

(4) void resizeEvent(QResizeEvent * event);

用于实现当标签数量改变时，操作按钮的位置改变

2、各个函数实现细节

（1）void paintEvent(QPaintEvent* event);

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void MyTabWidget::paintEvent(QPaintEvent* event)

{

QPainter painter(this);

QRect rectAdd(width()-m_tablepic.width(),tabBar()->rect().bottom()-m_tablepic.height()+7,m_tablepic.width(),m_tablepic.height()-5);

painter.drawImage(rectAdd,m_tablepic);

QTabWidget::paintEvent(event);

}

（2）void mousePressEvent(QMouseEvent * event);

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void MyTabWidget::mousePressEvent(QMouseEvent * event)

{

if(event->button()==Qt::LeftButton)

{

QRect tabRect = tabBar()->rect();

if(event->pos().y()>=tabRect.top() && event->pos().y()<=tabRect.bottom())

{

if(event->pos().x()>=width()-m_tablepic.width())

{

emit changeWidget();

}

}

}

QTabWidget::mousePressEvent(event);

}

(3) void mouseMoveEvent(QMouseEvent * event);

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void MyTabWidget::mouseMoveEvent(QMouseEvent * event)

{

QRect tabRect = tabBar()->rect();

if(event->pos().y()>=tabRect.top() && event->pos().y()<=tabRect.bottom())

{

if(event->pos().x()>=width()-m_tablepic.width())

{

int tempx = QCursor::pos().x();

int tempy = QCursor::pos().y();

QToolTip::showText(QPoint(tempx,tempy),"提示文本");

}

else

{

setToolTip("");

}

}

else

{

setToolTip("");

}

QTabWidget::mouseMoveEvent(event);

}

(4) void resizeEvent(QResizeEvent * event);

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void MyTabWidget::resizeTabBar()

{

int maxWidth = width() - m_tablepic.width();

int avgWidth = maxWidth/(tabBar()->count());

if(avgWidth>TAB_MAX_WIDTH)

avgWidth = TAB_MAX_WIDTH;

QString style = "QTabWidget{background-color:rgb(0,71,67);}\

QTabWidget::pane{border:3px solid rgb(0,71,67);border-top-right-radius:4px;border-bottom-left-radius:4px;border-bottom-right-radius:4px;}\

QTabBar::tab:first{height:"+QString("%0").arg(TAB_HEIGHT)+"px;backgroud-color:rgb(0,71,67);width:80px;backgroud-color:rgb(0,71,67);color:white;border-top-left-radius:4px;border-top-right-radius:4px;}\

QTabBar::tab:selected{background:rgb(0,71,67);}\

QTabBar::tab:!selected{background:rgb(16,96,95);}";

QString style1 = "QTabBar::tab{width:"+QString("%0").arg(avgWidth)+"px;height:"+QString("%0").arg(TAB_HEIGHT)+"px;backgroud-color:rgb(0,71,67);color:white;border-top-left-radius:4px;border-top-right-radius:4px;}";

QString style2 = "QScrollBar::vertical{background-color:rgb(54,80,79);margin:22px 0 22px 0;}\

QScrollBar::handle:vertical{background-color:rgb(0,71,67);min-height:25px;border-radius:4px;}\

QScrollBar::add-line:vertical{background-color:rgb(0,71,67);height:20px;border-top-left:3px;border-top-right:3px;subcontrol-position:bottom;subcontrol-origin:margin;}\

QScrollBar::sub-line:vertical{background-color:rgb(0,71,67);height:20px;border-bottom-left:3px;border-bottom-right:3px;subcontrol-position:top;subcontrol-origin:margin;}\

QScrollBar::up-arrow:vertical{width:0;height:0;border-width:5px 3px;border-style:solid;border-color:rgb(0,71,67) rgb(0,71,67) rgb(255,255,255) rgb(0,71,67);}\

QScrollBar::down-arrow:vertical {width:0;height:0;border-width:5px 3px;border-style:solid;border-color:rgb(255,255,255) rgb(0,71,67) rgb(0,71,67) rgb(0,71,67);}\

QScrollBar::add-page:vertical,QScrollBar::sub-page:vertical{background:none;}\

QScrollBar::horizontal{background-color:rgb(54,80,79);margin:0 22px 0 22px;}\

QScrollBar::handle:horizontal{background-color:rgb(0,71,67);min-width:25px;border-radius:4px;}\

QScrollBar::add-line:horizontal{background-color:rgb(0,71,67);width:20px;border-top-left:3px;border-bottom-left:3px;subcontrol-position:right;subcontrol-origin:margin;}\

QScrollBar::sub-line:horizontal{background-color:rgb(0,71,67);width:20px;border-top-right:3px;border-bottom-right:3px;subcontrol-position:left;subcontrol-origin:margin;}\

QScrollBar::right-arrow:horizontal{width:0;height:0;border-width:3px 5px;border-style:solid;border-color:rgb(0,71,67) rgb(0,71,67) rgb(0,71,67) rgb(255,255,255);}\

QScrollBar::left-arrow:horizontal {width:0;height:0;border-width:3px 5px;border-style:solid;border-color:rgb(0,71,71) rgb(255,255,255) rgb(0,71,67) rgb(0,71,67);}\

QScrollBar::add-page:horizontal,QScrollBar::sub-page:horizontal{background:none;}\

QScrollArea{border:0;background:rgb(64,71,71);}";

this->setStyleSheet(style+style1+style2);

}

注意：样式风格可以自由的调整