QT修改默认的滚动条样式

这几天写一个类似于悬浮窗的小程序，可是qt自带的滚动条实在难看，经过多番查找终于找到一个类似于qq聊天窗口的滚动条，废话不说上代码。希望能帮到大家

1.写入到文件中，新建个xx.qss，然后复制一下内容：

// 设置垂直滚动条基本样式
QScrollBar:vertical
{
    width:8px;
    background:rgba(0,0,0,0%);
    margin:0px,0px,0px,0px;
    padding-top:9px;   // 留出9px给上面和下面的箭头
    padding-bottom:9px;
}
QScrollBar::handle:vertical
{
    width:8px;
    background:rgba(0,0,0,25%);
    border-radius:4px;   // 滚动条两端变成椭圆
    min-height:20;
}
QScrollBar::handle:vertical:hover
{
    width:8px;
    background:rgba(0,0,0,50%);   // 鼠标放到滚动条上的时候，颜色变深
    border-radius:4px;
    min-height:20;
}
QScrollBar::add-line:vertical   // 这个应该是设置下箭头的，3.png就是箭头
{
    height:9px;width:8px;
    border-image:url(:/images/a/3.png);
    subcontrol-position:bottom;
}
QScrollBar::sub-line:vertical   // 设置上箭头
{
    height:9px;width:8px;
    border-image:url(:/images/a/1.png);
    subcontrol-position:top;
}
QScrollBar::add-line:vertical:hover   // 当鼠标放到下箭头上的时候
{
    height:9px;width:8px;
    border-image:url(:/images/a/4.png);
    subcontrol-position:bottom;
}
QScrollBar::sub-line:vertical:hover  // 当鼠标放到下箭头上的时候
{
    height:9px;width:8px;
    border-image:url(:/images/a/2.png);
    subcontrol-position:top;
}
QScrollBar::add-page:vertical,QScrollBar::sub-page:vertical   // 当滚动条滚动的时候，上面的部分和下面的部分
{
    background:rgba(0,0,0,10%);
    border-radius:4px;
}

接着在程序中读取文件：

QFile file(":/scrollbar.qss");
file.open(QFile::ReadOnly);
listWidget->verticalScrollBar()->setStyleSheet(file.readAll());

2.直接在程序中设置，简单

listWidget->verticalScrollBar()->setStyleSheet("QScrollBar:vertical"
                                                   "{"
                                                   "width:8px;"
                                                   "background:rgba(0,0,0,0%);"
                                                   "margin:0px,0px,0px,0px;"
                                                   "padding-top:9px;"
                                                   "padding-bottom:9px;"
                                                   "}"
                                                   "QScrollBar::handle:vertical"
                                                   "{"
                                                   "width:8px;"
                                                   "background:rgba(0,0,0,25%);"
                                                   " border-radius:4px;"
                                                   "min-height:20;"
                                                   "}"
                                                   "QScrollBar::handle:vertical:hover"
                                                   "{"
                                                   "width:8px;"
                                                   "background:rgba(0,0,0,50%);"
                                                   " border-radius:4px;"
                                                   "min-height:20;"
                                                   "}"
                                                   "QScrollBar::add-line:vertical"
                                                   "{"
                                                   "height:9px;width:8px;"
                                                   "border-image:url(:/images/a/3.png);"
                                                   "subcontrol-position:bottom;"
                                                   "}"
                                                   "QScrollBar::sub-line:vertical"
                                                   "{"
                                                   "height:9px;width:8px;"
                                                   "border-image:url(:/images/a/1.png);"
                                                   "subcontrol-position:top;"
                                                   "}"
                                                   "QScrollBar::add-line:vertical:hover"
                                                   "{"
                                                   "height:9px;width:8px;"
                                                   "border-image:url(:/images/a/4.png);"
                                                   "subcontrol-position:bottom;"
                                                   "}"
                                                   "QScrollBar::sub-line:vertical:hover"
                                                   "{"
                                                   "height:9px;width:8px;"
                                                   "border-image:url(:/images/a/2.png);"
                                                   "subcontrol-position:top;"
                                                   "}"
                                                   "QScrollBar::add-page:vertical,QScrollBar::sub-page:vertical"
                                                   "{"
                                                   "background:rgba(0,0,0,10%);"
                                                   "border-radius:4px;"
                                                   "}"
                                                   );