无法隐藏QComboBox的选择指示器 [英] Not able to hide Choice-Indicator of the QComboBox

问题描述

程序员

当我设置属于 QComboBox 的列表视图的背景颜色（根据QSS）时，此QComboBox将不再使用内置的外观和感觉。我必须同时根据QSS样式表指定所有光学设置：

When I set the background-color of the list view belonging to the QComboBox (per QSS), then this QComboBox will no more use the built-in-opticel-look-and feel. Instaed I have to specify all optical settings also per QSS-Stylesheet:

QComboBox QListView {
    background-color:white;
    border:1px solid black;
}

显示可选项的列表视图在左侧显示一个复选框现在。

The list view, which shows the chosable item, displays a checkbox on the left now. This box is checked for those item, chosen on last usage.

我如何隐藏带有复选框的列，以使它们不可见且不会会消耗屏幕上的任何空间吗？

预先感谢...

推荐答案

QComboBox的困难抽奖主题的QSS解决方法

如果您不使用QSS块，则QComboBox是使用其OS外观和感觉绘制的。如果您开始指定QSS规则，则QComboBox的某些或所有子控件将开始丢失OS外观。在最坏的情况下，您必须立即在QSS中指定所有属性。

If you don't use a QSS block, the QComboBox is drawn with its OS-Look-and-Feel. If you are starting to specify QSS rules some or all subcontrols of the QComboBox begin to lose the OS-Look-and-Feel. In worst case you have to specify all properties in QSS now.

本文的主题是选择指示符，由QStyleViewItem类绘制，该实现是在.Style中实现的。 QT源中的./src/gui/widgets/qcombobox_p.h。此功能似乎无法通过QProxyStyle的子类进行修改，该子类可在其他情况下用于解决硬布局问题。

Subject of this article is the choice indicator, drawn by the QStyleViewItem class, a render helper implemented in .../src/gui/widgets/qcombobox_p.h within the QT sources. This functionality seems to be unpossible modifyable by a subclass of QProxyStyle which can be used in other cases for hard layout problems.

但是，我在QSS中找到了一个解决方案，方法是指定一个精选的规则集：

However, I found a solution in QSS by specifying a well chosen set of rules:

/* Background color of popup-list.*/ 
QComboBox QListView{
    background-color:white;
    border:1px solid gray;
}
/* Needed to complete the rule set. */
QComboBox::item:alternate {
    background: white;
}
/* Color of the selected list item. */
QComboBox::item:selected {
    border: 1px solid transparent;
    background:yellow;
}
/* Indicator will shine through the label text if you don't make it hidden. */
QComboBox::indicator{
    background-color:transparent;
    selection-background-color:transparent;
    color:transparent;
    selection-color:transparent;
}

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