如何在PyQt中自定义QCompleter弹出窗口? [英] How can I customize the QCompleter popup window in PyQt?

问题描述

我对自定义感兴趣的QLineEdit的QCompleter感兴趣.我想使它的行为类似于Chrome中的地址/搜索栏.

I have a few things for a QLineEdit's QCompleter I'm interested in customizing. I want to make it behave similar to the address / search bar in Chrome.

1. 如何限制显示的行数?例如，即使有15个匹配项，我也只希望QCompleter显示5.
2. 如何调整弹出窗口的大小?例如，我想使弹出窗口美观而舒适.按照上面的示例，我希望弹出窗口精确地调整为5行，而不会显示任何难看的滚动条.
3. 如何移动弹出窗口?例如，我想调整弹出窗口的垂直位置，使其略低于父窗口小部件.
4. 如何格式化显示的弹出窗口的列表项?例如，我要加粗匹配单词的部分.

推荐答案

1. 要限制行数:将模型更改为 QStringListModel 使用 QCompleter.setModel ，并在显示弹出窗口之前设置固定数量的项目.还要确保正确设置 maxVisibleItems (默认值为7)
2. 弹出窗口的大小应调整为正确的 height 自动地.弹出窗口的 width 可以通过将边距宽度( popup.width()-popup.viewport().width())，帧的宽度( 2 * popup.frameWidth())和最长的字符串的宽度( popup.fontMetrics().boundingRect(string).width()).
3. 可以通过传递一个弹出窗口来控制弹出窗口的位置(和宽度)适当的 QRect QCompleter.complete .
4. 可以通过设置项目委托.参见此答案以富文本格式项目委托的示例为例.(但是请注意，这将影响弹出宽度的计算方式.)

1. To limit the number of rows: change the model to a QStringListModel using QCompleter.setModel, and set a fixed number of items before the popup is shown. Also ensure that maxVisibleItems is set appropriately (default is seven).
2. The popup window should resize to the correct height automatically. The width of the popup can be calculated by adding together the width of the margins (popup.width() - popup.viewport().width()), the width of the frame (2 * popup.frameWidth()), and the width of the longest string (popup.fontMetrics().boundingRect(string).width()).
3. The positioning (and width) of the popup can be controlled by passing an appropriate QRect to QCompleter.complete.
4. The format of the list items could be controlled by setting an item delegate on the popup. See this answer for an example of a rich-text item delegate. (But note that this will effect how the popup width is calculated).

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