提供一个复杂好看的QComboBox样式表

以下是一个比较复杂的QComboBox样式表，可以用来美化QComboBox外观：

QComboBox {
    border: 1px solid #C4C4C4;
    border-radius: 4px;
    padding: 2px 20px 2px 5px;
    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                 stop: 0 #F6F6F6, stop: 0.4 #E0E0E0,
                                 stop: 0.5 #D8D8D8, stop: 1.0 #C3C3C3);
    min-width: 100px;
}

QComboBox:hover, QComboBox:focus {
    border: 1px solid #7D7D7D;
}

QComboBox::drop-down {
    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                 stop: 0 #F6F6F6, stop: 0.4 #E0E0E0,
                                 stop: 0.5 #D8D8D8, stop: 1.0 #C3C3C3);
    border-radius: 4px;
}

QComboBox::down-arrow {
    image: url(arrow-down.png);
    width: 12px;
    height: 12px;
}

QComboBox::down-arrow:hover {
    image: url(arrow-down-hover.png);
}

QComboBox QAbstractItemView {
    border: 1px solid darkgray;
    selection-background-color: lightgray;
    background-color: white;
    outline: none;
}

QComboBox::item {
    padding: 2px 5px;
}

QComboBox::item:selected {
    background-color: lightgray;
}

这个样式表设置了QComboBox的边框、圆角、内边距、背景颜色和最小宽度。它还定义了下拉按钮的样式和箭头图像，并设置了下拉列表的样式。请注意，您需要将arrow-down.png和arrow-down-hover.png替换为实际的箭头图像。此外，还可以通过样式表设置QComboBox的字体、字号和字体颜色等属性。