树视图列中的 QPushButtons [英] QPushButtons in a column of a treeview

问题描述

我已经有一个树模型视图，其中包含带有标签、文本编辑和复选按钮的列.我要添加的是一个按钮.这是我卡住的地方:

I already have a tree model view that contains columns with a label, text edit, and a check button. What I am trying to add is a push button. Here is where I'm stuck:

1. 在flags"函数中，我将使用哪个命名空间?
2. 在数据"功能中，按钮的作用是什么?(例如在检查按钮的情况下，我使用了 Qt::CheckStateRole)
3. 在数据"函数(返回一个QVariant)中，我应该返回什么?创建的按钮?

1. In the "flags" function which namespace will I use?
2. In the "data" function what would be the role of the push button? (for example in the check button case I used the Qt::CheckStateRole)
3. In the "data" function (which returns a QVariant) what should I return? The button created?

我查看了有关此主题的其他答案，以及使用 setIndexWidget 建议的最受欢迎的答案，但我不确定如何.最后一点，我试图不使用 UI 设计器以编程方式执行此操作.

I have looked at other answers regarding this topic and the most popular answer suggested using a setIndexWidget however I am not sure how. Last note, I am attempting to do this programmatically not using the UI designer.

谢谢！

推荐答案

首先，您似乎对 Qt 的模型/视图框架的工作方式有些困惑.我建议你去查看 Qt 文档:http://doc.qt.io/qt-5/model-view-programming.html

Before anything else, you seem a bit confused about how Qt's model/view Framework is working. I suggest you go check Qt documentation about it: http://doc.qt.io/qt-5/model-view-programming.html

您的 3 个问题的答案:

The answers to your 3 questions:

1. 您不需要在 Qt::ItemFlags QAbstractItemModel::flags(const QModelIndex &index) const 中使用任何命名空间.只需返回适合您的索引的特定 Qt::ItemFlags(即 Qt::ItemFlag 的组合).这与您希望在视图中使用 QPushButton 的事实无关.我认为您对 Qt::ItemIsUserCheckable 标志感到困惑，这使视图显示一个复选框.然而，这并不是这个标志的真正作用，实际上它只是告诉视图为用户提供一种方法来更改索引的 Qt::CheckStateRole.视图的默认行为是通过显示 QCheckBox 来实现的.

1. You do not need to use any namespaces in Qt::ItemFlags QAbstractItemModel::flags(const QModelIndex &index) const. Just return the particular Qt::ItemFlags (i.e combination of Qt::ItemFlag) which suits your index. This has nothing to do with the fact that you want a QPushButton in your view. I think your are confused by the Qt::ItemIsUserCheckable flag, which make the view display a check box. However that is not what this flag really does, actually it just tells the view to offer a mean for the user to change the Qt::CheckStateRole of the index. The default behaviour of the view is to do it by display a QCheckBox.

没有与按钮相关的角色.您可以使用Qt::CheckStateRole 或Qt::EditRole，这取决于您选择显示QPushButton 的方法.

There are no roles associated with push buttons. You can use Qt::CheckStateRole or Qt::EditRole, it depends on the method you choose to display the QPushButton.

在QVariant QAbstractItemModel::data(const QModelIndex &index, int role = Qt::DisplayRole) const中，当role为Qt::CheckStateRole 或 Qt::EditRole，你可以返回一个布尔值来控制 QPushButton 的状态.但是，您永远不应该返回 QWidget(或派生的)，模型处理数据，而不是它们的显示方式.

In QVariant QAbstractItemModel::data(const QModelIndex &index, int role = Qt::DisplayRole) const, when role is Qt::CheckStateRole or Qt::EditRole, you may return a boolean which will control the state of the QPushButton. However, you should NEVER return a QWidget (or derived), the model handles data, not how they are displayed.

解决办法:重新实现QAbstractItemDelegate(或QStyledItemDelegate).重写:

A solution: Reimplement QAbstractItemDelegate (or QStyledItemDelegate). Rewrite:

• createEditor():创建一个QPushButton.
• setEditorData():使用您在QAstractItemModel::data() 中使用的索引和角色设置QPushButton 状态.立>
• setModelData():根据QPushButton状态更新模型.

• createEditor(): create a QPushButton.
• setEditorData(): set the QPushButton state using the index and the role you used in QAstractItemModel::data().
• setModelData(): update the model according to the QPushButton state.

在您的视图上设置您的委托 (QTreeView::setItemDelegateForColumn()).此时，您只会在编辑时获得一个按钮.然后您可以调用 QAbstractItemView::openPersistentEditor() 使其始终可见.

Set your delegate on your view (QTreeView::setItemDelegateForColumn()). At this point you will get a push button only when in edition. You can then call QAbstractItemView::openPersistentEditor() to make it always visible.

这篇关于树视图列中的 QPushButtons的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！