多级QTreeView

Question

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

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:

到目前为止只显示'root'项,它不会抛出任何错误.

另外,我把这个for循环变得有点匆忙,它很难阅读/理解,因为它有太多嵌套for循环.我想知道是否有更好的方法来扩展基于初始字典的树.

Answer 1

您正在为每个项目创建模型.那是错的.您应该.appendRow/.insertRow在项目上使用添加子项目.

至于你的循环,我可能会使用递归方法来填充树.这是我要做的:

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:你也没有在主窗口中使用任何布局.我在上面添加了它.

PSv2:如果可能的话,最好避免在python中进行类型检查,但这是你构建自己的方式所必需的tree.如果你以不同dict的方式构建它会更好,就像所有方式一样:

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