qt下拉框

QComboBox uses the model/view framework for its popup list and to store its items. By default a QStandardItemModel stores the items and a QListView subclass displays the popuplist.

QComboBox 使用模型/视图框架作为其弹出列表并存储其项目。默认情况下，QStandardItemModel 存储项目，QListView 子类显示弹出列表。

qss

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/*下拉框*/
QComboBox
{
    border-radius: 3px;
    color: rgb(0,0,0);
    border: 1px solid #c2c2c2;;
    padding-top: 2px;
    padding-left: 2px;
    background-color: transparent;
}
QComboBox:disabled
{
    color:rgb(160,160,160);
    background-color: rgba(0, 0, 0, 0.3);
}
/*点击combox的样式*/
QComboBox:on
{
    color: rgb(0, 0, 0);
    padding-top: 4px;
    padding-left: 4px;
    background-color: rgba(0, 0, 0, 0.0);
    border: 1px solid #c2c2c2;
    border-radius: 5px;
}
/*下拉框的样式*/
QComboBox QAbstractItemView 
{
    height: 30px;   
    font-size: 16px;
    outline: 0px solid gray;  /*取消选中虚线*/
    border: 1px solid rgb(66,66,66);  
    color: rgb(0,0,0);
    background-color:rgba(0, 0, 0, 0.0);
}
 /*选中每一项高度*/
QComboBox QAbstractItemView::item
{  
    color: rgb(255,255,255);
    background-color:  rgba(0, 0, 0, 0.3);
}
/*选中每一项的字体颜色和背景颜色*/
QComboBox QAbstractItemView::item:selected 
{
    color:rgba(75,175,255, 1);   
    background-color:  rgba(0, 0, 0, 0.0);
}
 /*下拉箭头的边框*/
QComboBox::drop-down 
{
    border:none;
}
 /*下拉箭头样式*/
QComboBox::down-arrow 
{
    image: url(./res/comboboxdown.png);
}
 /*下拉箭头点击样式*/
QComboBox::down-arrow:on
{
    image: url(./res/comboboxdown1.png);
}

cpp

对话框类构造函数里面调用

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// 重新设置QListView,否则qss QComboBox QAbstractItemView不生效
ui->comboBox->setView(new QListView(ui->comboBox)); 
// 不设置Popup则列表不能弹出；不设置FramelessWindowHint则不能无边框；不设置NoDropShadowWindowHint则右下角有默认三角形阴影。
ui->comboBox->view()->parentWidget()->setWindowFlags(Qt::Popup | Qt::FramelessWindowHint| Qt::NoDropShadowWindowHint);
// 设置背景透明，否则qss透明度不生效
ui->comboBox->view()->parentWidget()->setAttribute(Qt::WA_TranslucentBackground);

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