多级QTreeView [英] Multi-level QTreeView

问题描述

我很难理解如何使用QTreeView和QStandardItemModel设置多级QTree.

I'm having a hard time understanding how to set a multilevel QTree using the QTreeView and QStandardItemModel.

这就是我所拥有的:

from PySide.QtGui import *
import sys

class MainFrame(QWidget):
    def __init__(self):
        QWidget.__init__(self)

        tree = {'root': {
                    "1": ["A", "B", "C"],
                    "2": {
                        "2-1": ["G", "H", "I"],
                        "2-2": ["J", "K", "L"]},
                    "3": ["D", "E", "F"]}
        }

        self.tree = QTreeView(self)
        root_model = QStandardItemModel()
        self.tree.setModel(root_model)

        for r,root in enumerate(sorted(tree)):
            root_item = QStandardItem(root)
            root_model.setItem(r,root_item)

            for c,child in enumerate(sorted(tree[root])):
                child_model = QStandardItemModel(root_model)
                child_item = QStandardItem(child)
                child_model.setItem(c, child_item)

                for gc, grand_child in enumerate(sorted(tree[root][child])):
                    grand_child_model = QStandardItemModel(child_model)
                    grand_child_item = QStandardItem(grand_child)
                    grand_child_model.setItem(gc,grand_child_item)

                    if type(tree[root][child]) == dict:
                        for ggc, gran_grand_child in enumerate(sorted(tree[root][child][grand_child])):
                            gran_grand_child_model = QStandardItemModel(grand_child_model)
                            gran_grand_child_item = QStandardItem(gran_grand_child)
                            gran_grand_child_model.setItem(ggc, gran_grand_child_item)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    main = MainFrame()
    main.show()
    sys.exit(app.exec_())

我希望它看起来像这样:

I want it to look like this:

到目前为止，仅显示"root"项，它没有引发任何错误.

So far only the 'root' item is showing, it's not throwing any error.

此外，我急忙制作了这个for循环，很难读/理解，因为它嵌套了太多的for循环.我想知道是否有更好的方法可以根据初始命令扩展树.

Also, I made this for-loops in a bit of hurry, it's kind hard to read/understand because it has too many nested for loops. I wonder if there's a better way to expand the tree based on the initial dict.

推荐答案

您正在为每个项目创建一个模型.错了您应该在某项上使用.appendRow/.insertRow来添加子项.

You're creating a model for each item. That's wrong. You should use .appendRow/.insertRow on an item to add child items.

对于您的循环，我可能会使用递归方法来填充树.这是我要做的:

As for your loops, I'd probably use a recursive method to populate the tree. Here is what I'd do:

from PySide.QtGui import *
import sys
import types

class MainFrame(QWidget):
    def __init__(self):
        QWidget.__init__(self)

        tree = {'root': {
                    "1": ["A", "B", "C"],
                    "2": {
                        "2-1": ["G", "H", "I"],
                        "2-2": ["J", "K", "L"]},
                    "3": ["D", "E", "F"]}
        }

        self.tree = QTreeView(self)
        layout = QHBoxLayout(self)
        layout.addWidget(self.tree)

        root_model = QStandardItemModel()
        self.tree.setModel(root_model)
        self._populateTree(tree, root_model.invisibleRootItem())

    def _populateTree(self, children, parent):
        for child in sorted(children):
            child_item = QStandardItem(child)
            parent.appendRow(child_item)
            if isinstance(children, types.DictType):
                self._populateTree(children[child], child_item)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    main = MainFrame()
    main.show()
    sys.exit(app.exec_())

PS :您还没有在主窗口中使用任何布局.我在上面添加了它.

PS: You're also not using any layouts for the main window. I added it above.

PSv2 :最好在python中避免类型检查，但这是构造tree的一种必要方式.如果您以不同的方式构造它会更好，例如dict可能一直这样:

PSv2: Type-checking is best avoided in python, if possible, but it's kind of necessary the way you structured your tree. It'd be better if you structured it differently, like dicts all the way maybe:

tree = {'root': {
            '1': {'A':{}, 'B':{}, 'C':{}},
             ...
       }

这篇关于多级QTreeView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！