【问题标题】：add feature for previous question PySide2 QListView and QTableView为上一个问题 PySide2 QListView 和 QTableView 添加功能
【发布时间】：2019-01-03 09:36:25
【问题描述】：

上一个问题是PySide2 QListView QTableView sync problem

想象在数据结构中有另一个dict4：

'dict4':{'k8':'v8', 'EXISTING_DICT':'dict2'},

意思是一个字典可以包含另一个现有的字典。

所以QTableView中的表示不应该直接显示，但是：

1) 在 QTableView 中只显示它的名字：

k1 | v1
-------
k2 | v2
-------
k3 | v3
-------
dict2

2）如果双击它：选择QListView中已有的字典，这将触发在QTableView中显示其内容，在这种情况下：

k4 | v4

【问题讨论】：

标签： python model-view-controller qtableview qlistview pyside2

【解决方案1】：

本例的思路是用一个角色来表示该字段指向另一个item，然后用setSpan连接items，最后通过select if it is so来检查QTableView中选中的item是否指向另一个元素

from PySide2 import QtCore, QtGui, QtWidgets

dict_of_dicts={
    'dict1':{'k1':'v1', 'k2':'v2', 'k3':'v3', 'EXISTING_DICT': 'dict3'},
    'dict2':{'k4':'v4', 'EXISTING_DICT': 'dict1'},
    'dict3':{'k5':'v5', 'k6':'v6', 'k7':'v7', 'EXISTING_DICT': 'dict4'},
    'dict4':{'k8':'v8', 'EXISTING_DICT':'dict2'},
}

def create_model_from_dict(d, parent=None):
    model = QtGui.QStandardItemModel(0, 2, parent)
    for k, v in dict_of_dicts.items():
        it = QtGui.QStandardItem(k)
        model.appendRow(it)
        for k_, v_ in v.items():
            if k_ != "EXISTING_DICT":
                it.appendRow([QtGui.QStandardItem(k_), QtGui.QStandardItem(v_)])
            else:
                child_it = QtGui.QStandardItem(v_)
                child_it.setTextAlignment(QtCore.Qt.AlignCenter)
                child_it.setData(True, QtCore.Qt.UserRole + 1000)
                it.appendRow(child_it)
    return model

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        model = create_model_from_dict(dict_of_dicts, self)

        self.tableview = QtWidgets.QTableView()
        self.tableview.setModel(model)
        self.tableview.selectionModel().selectionChanged.connect(self.handleSelectionChangedTV)

        self.listview = QtWidgets.QListView()
        self.listview.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)
        self.listview.setModel(model)
        self.listview.selectionModel().selectionChanged.connect(self.handleSelectionChangedLV)
        self.listview.selectionModel().select(model.index(0, 0), QtCore.QItemSelectionModel.Select)

        hlay = QtWidgets.QHBoxLayout(self)
        hlay.addWidget(self.listview)
        hlay.addWidget(self.tableview)

    @QtCore.Slot(QtCore.QItemSelection)
    def handleSelectionChangedLV(self, item):
        ixs = item.indexes()
        if ixs:
            self.tableview.setRootIndex(ixs[0])
            model = self.tableview.model()
            self.tableview.clearSpans()
            for r in range(model.rowCount(self.tableview.rootIndex())):
                index = model.index(r, 0, self.tableview.rootIndex())
                if index.data(QtCore.Qt.UserRole + 1000):
                    self.tableview.setSpan(r, 0, 1, 2)

    @QtCore.Slot(QtCore.QItemSelection)
    def handleSelectionChangedTV(self, item):
        ixs = item.indexes()
        if ixs:
            ix = ixs[0]
            if ix.data(QtCore.Qt.UserRole + 1000):
                items = self.listview.model().findItems(ix.data())
                if items:
                    self.tableview.clearSelection()
                    self.listview.selectionModel().select(items[0].index(), QtCore.QItemSelectionModel.ClearAndSelect)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

更新：

from PySide2 import QtCore, QtGui, QtWidgets

dict_of_dicts={
    'dict1':{'k1':'v1', 'k2':'v2', 'k3':'v3', 'EXISTING_DICT': 'dict3'},
    'dict2':{'k4':'v4', 'EXISTING_DICT': 'dict1'},
    'dict3':{'k5':'v5', 'k6':'v6', 'k7':'v7', 'EXISTING_DICT': 'dict4'},
    'dict4':{'k8':'v8', 'EXISTING_DICT':'dict2'},
}

def create_model_from_dict(d, parent=None):
    model = QtGui.QStandardItemModel(0, 2, parent)
    for k, v in dict_of_dicts.items():
        it = QtGui.QStandardItem(k)
        model.appendRow(it)
        for k_, v_ in v.items():
            if k_ != "EXISTING_DICT":
                it.appendRow([QtGui.QStandardItem(k_), QtGui.QStandardItem(v_)])
            else:
                child_it = QtGui.QStandardItem(v_)
                child_it.setTextAlignment(QtCore.Qt.AlignCenter)
                child_it.setData(True, QtCore.Qt.UserRole + 1000)
                it.appendRow(child_it)
    return model

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        model = create_model_from_dict(dict_of_dicts, self)

        self.tableview = QtWidgets.QTableView()
        self.tableview.setModel(model)
        self.tableview.doubleClicked.connect(self.handleSelectionChangedTV)

        self.listview = QtWidgets.QListView()
        self.listview.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)
        self.listview.setModel(model)
        self.listview.selectionModel().selectionChanged.connect(self.handleSelectionChangedLV)
        self.listview.selectionModel().select(model.index(0, 0), QtCore.QItemSelectionModel.Select)

        hlay = QtWidgets.QHBoxLayout(self)
        hlay.addWidget(self.listview)
        hlay.addWidget(self.tableview)

    @QtCore.Slot(QtCore.QItemSelection)
    def handleSelectionChangedLV(self, item):
        ixs = item.indexes()
        if ixs:
            self.tableview.setRootIndex(ixs[0])
            model = self.tableview.model()
            self.tableview.clearSpans()
            for r in range(model.rowCount(self.tableview.rootIndex())):
                index = model.index(r, 0, self.tableview.rootIndex())
                if index.data(QtCore.Qt.UserRole + 1000):
                    self.tableview.setSpan(r, 0, 1, 2)

    @QtCore.Slot(QtCore.QModelIndex)
    def handleSelectionChangedTV(self, ix):
        if ix.data(QtCore.Qt.UserRole + 1000):
            items = self.listview.model().findItems(ix.data())
            if items:
                self.tableview.clearSelection()
                self.listview.selectionModel().select(items[0].index(), QtCore.QItemSelectionModel.ClearAndSelect)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

更新2

from PySide2 import QtCore, QtGui, QtWidgets

dict_of_dicts={
    'dict1':{'k1':'v1', 'k2':'v2', 'k3':'v3', 'EXISTING_DICT': 'dict3'},
    'dict2':{'k4':'v4', 'EXISTING_DICT': 'dict1'},
    'dict3':{'k5':'v5', 'k6':'v6', 'k7':'v7', 'EXISTING_DICT': 'dict4'},
    'dict4':{'k8':'v8', 'EXISTING_DICT':'dict2'},
}

def create_model_from_dict(d, parent=None):
    model = QtGui.QStandardItemModel(0, 2, parent)
    for k, v in dict_of_dicts.items():
        it = QtGui.QStandardItem(k)
        model.appendRow(it)
        for k_, v_ in v.items():
            if k_ != "EXISTING_DICT":
                it.appendRow([QtGui.QStandardItem(k_), QtGui.QStandardItem(v_)])
            else:
                child_it = QtGui.QStandardItem(v_)
                child_it.setTextAlignment(QtCore.Qt.AlignCenter)
                child_it.setData(True, QtCore.Qt.UserRole + 1000)
                it.appendRow(child_it)
    return model

class TableView(QtWidgets.QTableView):
    leftDoubleClicked = QtCore.Signal(QtCore.QModelIndex)

    def mouseDoubleClickEvent(self, event):
        super(TableView, self).mouseDoubleClickEvent(event)
        if event.buttons() & QtCore.Qt.LeftButton:
            ix = self.indexAt(event.pos())
            if ix.isValid(): self.leftDoubleClicked.emit(ix)

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        model = create_model_from_dict(dict_of_dicts, self)

        self.tableview = TableView()
        self.tableview.setModel(model)
        self.tableview.leftDoubleClicked.connect(self.handleSelectionChangedTV)

        self.listview = QtWidgets.QListView()
        self.listview.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)
        self.listview.setModel(model)
        self.listview.selectionModel().selectionChanged.connect(self.handleSelectionChangedLV)
        self.listview.selectionModel().select(model.index(0, 0), QtCore.QItemSelectionModel.Select)

        hlay = QtWidgets.QHBoxLayout(self)
        hlay.addWidget(self.listview)
        hlay.addWidget(self.tableview)

    @QtCore.Slot(QtCore.QItemSelection)
    def handleSelectionChangedLV(self, item):
        ixs = item.indexes()
        if ixs:
            self.tableview.setRootIndex(ixs[0])
            model = self.tableview.model()
            self.tableview.clearSpans()
            for r in range(model.rowCount(self.tableview.rootIndex())):
                index = model.index(r, 0, self.tableview.rootIndex())
                if index.data(QtCore.Qt.UserRole + 1000):
                    self.tableview.setSpan(r, 0, 1, 2)

    @QtCore.Slot(QtCore.QModelIndex)
    def handleSelectionChangedTV(self, ix):
        if ix.data(QtCore.Qt.UserRole + 1000):
            items = self.listview.model().findItems(ix.data())
            if items:
                self.tableview.clearSelection()
                self.listview.selectionModel().select(items[0].index(), QtCore.QItemSelectionModel.ClearAndSelect)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

【讨论】：