自定义QTreeView项目的复选框 [英] Customizing the checkboxes of the items of a QTreeView

问题描述

我遇到以下情况：我需要创建一个自定义树控件，其复选框也是自定义的。我通过使用样式表很容易做出树控件的大部分定制;我已经成功地添加复选框到QTreeView的项目，但我有自定义它们的大问题 - 我需要显示自定义图像的检查状态，另一个为未检查的状态。

I'm having the following situation: I need to create a custom tree control, whose checkboxes are also customized. I have easily made most of the customizations for the tree control by using style sheets; I have succeeded adding checkboxes to the QTreeView's items, but I'm having big problems with customizing them - I need to display a custom image for the checked state, and another for the unchecked state.

我认为这可以做的地方是在我的子类QStyledItemDelegate，在paint事件（即CheckBoxItemDelegate :: paint）。我需要的是显示文本，图标和项目的复选框。但是问题是：

- 我无法获得项目的样式（我使用样式表设置） - 否则我的文本可能用不正确的颜色绘制;

- 我不知道每个子项的rect（复选框，图标，文本）;

- 我不知道如何获取一个项目的图标（给定它的QModelIndex）绘制

The place I concluded this can be done is in my subclass of QStyledItemDelegate, in the paint event (i.e. CheckBoxItemDelegate::paint). What I need is to display the text, the icon, and the checkbox for the item. But the problems are:
- I can't get the style of the item (which I set using the stylesheet) - otherwise my text can be drawn with the incorrect color;
- I don't know the rects of each subitem (the checkbox, the icon, the text);
- I don't know how to get the icon of an item (given its QModelIndex) to draw it.

PS我已经子类化了QTreeView（显然），并且，因为我正在使用QFileSystemModel，我已经将它子类化了，以便添加复选框功能。

P.S. I had subclassed the QTreeView (obviously), and, as I am working with QFileSystemModel, I have subclassed it too in order to add the checkbox functionality to it.

请帮帮我？
是QStyledItemDelegate :: paint适当的地方更改树项目的复选框的视觉效果吗？如果是，你能给我一个小例子或什么，我怎么能这样做？

Can anybody help me, please? Is QStyledItemDelegate::paint the proper place for changing the visuals of the checkbox of the tree items? If yes, can you please give me a small example or something, how I can do that?

推荐答案

这是我如何渲染QTreeView中的可检查项目有两个图像（眼睛打开/眼睛闭合， ）而不是复选框：

This is how I rendered checkable items inside a QTreeView with two images (eye opened/eye closed, to represent their visibility state) instead of a checkbox:

ui.myTreeView->setStyleSheet(
    "QTreeView::indicator:unchecked {image: url(:/icons/eye_grey.png);}"
    "QTreeView::indicator:checked {image: url(:/icons/eye.png);}"
  );

当然，项目应设置为可检查。希望这有助于。

Items should be set as checkable, of course. Hope this helps.

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