qt - 如何获得 QSlider-handle 的大小？

Question

QSlider在不同平台上的显示方式不同。如何获得a的widthand height，是否使用CSS设置样式？我只知道检索整个QWidget的方法，但不知道?handleQSlidersizehandle

Answer 1

有一种可怕的方法，它可能不必正常工作，但它仍然有效：

QSize sliderHandleSize( const QSlider& slider )
{
    const QSize _minSize = slider.minimumSizeHint();
    
    switch( slider.orientation() )
    {
        case Qt::Orientation::Horizontal:
            return QSize( _minSize.width() - 1, _minSize.height() );
        case Qt::Orientation::Vertical:
            return QSize( _minSize.width(), _minSize.height() - 1 );
        default:
            Q_ASSERT_X( false, "sliderHandleSize", "Today is a bad day" );
    }
    
    return _minSize;
}

Answer 2

检查QSlider 样式表示例：

QSlider::groove:horizontal
{
    border: 1px solid #bbb;
    background: white;
    height: 10px;
    border-radius: 4px;
}

QSlider::sub-page:horizontal
{
    background: qlineargradient(x1: 0, y1: 0,    x2: 0, y2: 1,
        stop: 0 #66e, stop: 1 #bbf);
    background: qlineargradient(x1: 0, y1: 0.2, x2: 1, y2: 1,
        stop: 0 #bbf, stop: 1 #55f);
    border: 1px solid #777;
    height: 10px;
    border-radius: 4px;
}

QSlider::add-page:horizontal
{
    background: #fff;
    border: 1px solid #777;
    height: 10px;
    border-radius: 4px;
}

QSlider::handle:horizontal
{
    background: qlineargradient(x1:0, y1:0, x2:1, y2:1,
        stop:0 #eee, stop:1 #ccc);
    border: 1px solid #777;
    width: 13px;
    margin-top: -2px;
    margin-bottom: -2px;
    border-radius: 4px;
}

QSlider::handle:horizontal:hover
{
    background: qlineargradient(x1:0, y1:0, x2:1, y2:1,
        stop:0 #fff, stop:1 #ddd);
    border: 1px solid #444;
    border-radius: 4px;
}

QSlider::sub-page:horizontal:disabled
{
    background: #bbb;
    border-color: #999;
}

QSlider::add-page:horizontal:disabled
{
    background: #eee;
    border-color: #999;
}

QSlider::handle:horizontal:disabled
{
    background: #eee;
    border: 1px solid #aaa;
    border-radius: 4px;
}