在QTreeView的子项上设置小部件 [英] To set widgets on children items on QTreeView

问题描述

由于此线程，我能够将窗口小部件添加到QAbstractItemView(在我的示例中， QTreeView ) view.

Thanks to this thread, I'm able to add widgets to 2nd or later column of QAbstractItemView (in my example QTreeView) of top level items of a view.

但是可以将小部件添加到子项吗?

But is it possible to add widgets to the children items?

这是我尝试过的部分成功的方法:

Here's what I've tried which partly went well:

#!/usr/bin/env python
import os

from PyQt4.QtCore import QModelIndex, Qt
from PyQt4.QtGui import QApplication, QItemSelectionModel, \
                        QPushButton, QStandardItem, \
                        QStandardItemModel, QTreeView
from PyQt4.uic import loadUi


class PrvTreeviewNest(QTreeView):
    def __init__(self):
        super(PrvTreeviewNest, self).__init__()

        loadUi('/home/user/yourproject/resource/treeview_nest.ui')

        # row can be 0 even when it's more than 0.
        self._datamodel = QStandardItemModel(0, 2)
        self.setModel(self._datamodel)

        for i in range(4):
            self._add_widget(i + 1)

        self.show()

    def _add_widget(self, n):
        std_item = QStandardItem('{}th item'.format(n))
        self._datamodel.setItem(n, 0, std_item)

        node_widget = QPushButton('{}th button'.format(n))
        qindex_widget = self._datamodel.index(n, 1, QModelIndex())
        self.setIndexWidget(qindex_widget, node_widget)

        if n == 2:
            std_item_child = QStandardItem('child')
            std_item.appendRow(std_item_child)

            node_widget_child = QPushButton('petit button')
            qindex_widget_child = self._datamodel.index(n, 1, QModelIndex())
            self.setIndexWidget(qindex_widget_child, node_widget_child)

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    # window = TreeviewWidgetSelectProve()
    window = PrvTreeviewNest()
    # window = TreeviewWidgetSelectProve()
    window.resize(320, 240)
    # window.show();
    window.setWindowTitle(
         QApplication.translate("toplevel", "Top-level widget"))
    # window.add_cols()

    sys.exit(app.exec_())

treeview_nest.ui 可用.

在下面的图像中您看到，项目child没有显示按钮，并且其父项的按钮被覆盖.显然我不知道如何为它编写代码.

You see in the image below that the item child doesn't show a button and its parent's button is overwritten. Apparently I have no idea how to write a code for it.

更新)，我了解了如何向孩子添加小部件.足够棘手的是，将 QStandardItem.insertRow 与索引结合使用工作.在上面的示例代码中，将_add_widget替换为以下内容:

Update) I figured out how to add widget to children. Tricky enough, using QStandardItem.insertRow combined with index does the work. In my sample code above, replace _add_widget with the following:

    def _add_widget(self, n):
        item_toplevel = QStandardItem('{}th item'.format(n))
        self._datamodel.setItem(n, 0, item_toplevel)

        widget_toplevel = QPushButton('{}th button'.format(n))
        qindex_toplevel = self._datamodel.index(n, 1, QModelIndex())
        self.setIndexWidget(qindex_toplevel, widget_toplevel)

        if n == 2:
            item_child_col0 = QStandardItem('child col0')
            item_child_col1 = QStandardItem('child col1')
            #item_toplevel.appendRow(item_child_col0)

            item_toplevel.insertRow(0, [item_child_col0, item_child_col1])

            widget_child = QPushButton('child widget')
            qindex_child = item_child_col1.index()
            self.setIndexWidget(qindex_child, widget_child)

我确定这不是最佳/理想的设计方法，但似乎对我有用.在受到@Phlucious的回答启发后，我想到了这一点.谢谢！

I'm sure this is NOT the best/ideal designed way but seems to work for me. I came up with after inspired by @Phlucious's answer. Thanks!

推荐答案

您的错误在此行上:

qindex_widget_child = self._datamodel.index(n, 1, QModelIndex())
self.setIndexWidget(qindex_widget_child, node_widget_child)

它为您提供了模型的第2行第1列 上的索引，它是第二项"，而不是您的孩子.您的孩子在std_item的第1行第1列中.在Qt中，尤其是在QStandardItemModel中，子级是相对于其父级而不是相对于模型存储的.

It's giving you the index on row 2 column 1 of the model, which is the "2th item", not your child. Your child is on row 1 column 1 of std_item. In Qt, especially in QStandardItemModel, Children are stored relative to their parent, not relative to the model.

我对PyQt不够熟悉，无法为您提供确切的代码，但是您应该可以执行以下操作:

I'm not familiar enough with PyQt to give you the exact code, but you should be able to do something like this:

qindex_widget_child = std_item_child.index(QModelIndex())
self.setIndexWidget(qindex_widget_child, node_widget_child)

或类似这样:

qindex_widget_child = std_item.child(0, 1).index(QModelIndex())
self.setIndexWidget(qindex_widget_child, node_widget_child)

这篇关于在QTreeView的子项上设置小部件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！