更新连接到单个数据模型的多个对话框上的多个视图

Question

我有两个表单，其中两个视图连接到同一个 dataModel 类，但是当我更改一个表单上的数据时，另一个表单上的数据没有变化。

我正在尝试在几个不同的对话框/表单上获取一个组合框，以便在基础数据从另一个对话框/表单更改时得到更新。

这是我的代码：

class Model(QStringListModel):

    def __init__(self, parent=None):
        super(Model, self).__init__(parent)
        data = QStringList()
        data << "one" << "two" << "three" << "four" << "five"
        self.setStringList(data)


class Form_2(QDialog):

    def __init__(self, parent=None):
        super(Form_2, self).__init__(parent)
        self.model = Model()
        self.combo = QListView()
        self.combo.setModel(self.model)

        layout = QVBoxLayout()
        layout.addWidget(self.combo)
        self.setLayout(layout)


class Form_1(QDialog):

    def __init__(self, parent=None):
        super(Form_1, self).__init__(parent)
        self.model = Model()
        self.listView = QListView()
        self.listView.setModel(self.model)
        self.combo = QComboBox()
        self.combo.setModel(self.model)
        self.form2_button = QPushButton("Open Form_2")

        layout = QVBoxLayout()
        layout.addWidget(self.listView)
        layout.addWidget(self.combo)
        layout.addWidget(self.form2_button)
        self.setLayout(layout)

        self.connect(self.form2_button, SIGNAL("clicked()"), self.form_2)

    def form_2(self):
        self.ft = Form_2()
        self.ft.show()


app = QApplication(sys.argv)
form = Form_1()
form.show()
app.exec_()

Answer 1

感谢 ccc.larc 给我答案。我们基本上只能使用模型的一个实例，如果模型有多个实例，它就不起作用。因此，您始终必须将模型的相同实例传递给您希望它使用的任何形式。

如果我理解正确，这就是@X.Jacobs 所说的，我只是展示了我的新代码，它更简单一些，可以更好地理解它与我以前的代码的对比（那不起作用）

所以我上面的代码只需要一个小的改动。

class Model(QStringListModel):

    def __init__(self, parent=None): 
        super(Model, self).__init__(parent)
        data = QStringList()
        data << "one" << "two" << "three" << "four" << "five"
        self.setStringList(data)


class Form_2(QDialog):

    def __init__(self, model, parent=None): #get the model from the calling form
        super(Form_2, self).__init__(parent)
        self.model = model
        self.combo = QListView()
        self.combo.setModel(self.model)

        layout = QVBoxLayout()
        layout.addWidget(self.combo)
        self.setLayout(layout)


class Form_1(QDialog):

    def __init__(self, parent=None):
        super(Form_1, self).__init__(parent)
        self.model = Model()
        self.listView = QListView()
        self.listView.setModel(self.model)
        self.combo = QComboBox()
        self.combo.setModel(self.model)
        self.form2_button = QPushButton("Open Form_2")

        layout = QVBoxLayout()
        layout.addWidget(self.listView)
        layout.addWidget(self.combo)
        layout.addWidget(self.form2_button)
        self.setLayout(layout)

        self.connect(self.form2_button, SIGNAL("clicked()"), self.form_2)

    def form_2(self):
        self.ft = Form_2(self.model) #pass the same model to the new form
        self.ft.show()


app = QApplication(sys.argv)
form = Form_1()
form.show()
app.exec_()

Answer 2

下面是一个基本示例，说明基于同一模型的多个视图在修改任何视图时如何自我更新：

#!/usr/bin/env python
#-*- coding:utf-8 -*-

from PyQt4 import QtGui, QtCore

class MyDialog(QtGui.QWidget):
    def __init__(self, modelSource, parent=None):
        super(MyDialog, self).__init__(parent)

        self.tableView = QtGui.QTableView(self)
        self.tableView.horizontalHeader().setStretchLastSection(True)
        self.tableView.setModel(modelSource)

        self.listView = QtGui.QListView(self)
        self.listView.setModel(modelSource)
        self.listView.setModelColumn(0)

        self.comboBox = QtGui.QComboBox(self)
        self.comboBox.setModel(modelSource)
        self.comboBox.setModelColumn(1)

        self.layoutGrid = QtGui.QGridLayout(self)
        self.layoutGrid.addWidget(self.comboBox, 0, 0, 1, 2)
        self.layoutGrid.addWidget(self.listView, 1, 0, 1, 1)
        self.layoutGrid.addWidget(self.tableView, 1, 1, 1, 1)

class MyWindow(QtGui.QWidget):
    _dialogs = []
    def __init__(self, parent=None):
        super(MyWindow, self).__init__(parent)

        self.modelSource = QtGui.QStandardItemModel(self)

        for rowNumber in range(3):
            items = []
            for columnNumber in range(3):
                item = QtGui.QStandardItem()
                item.setText("row: {0} column {1}".format(rowNumber, columnNumber))

                items.append(item)

            self.modelSource.appendRow(items)

        self.labelDialogs = QtGui.QLabel(self)
        self.labelDialogs.setText("Select a number of dialogs to create:")

        self.spinBoxDialogs = QtGui.QSpinBox(self)
        self.spinBoxDialogs.setValue(3)

        self.pushButtonShow = QtGui.QPushButton(self)
        self.pushButtonShow.setText("Show Dialogs!")
        self.pushButtonShow.clicked.connect(self.on_pushButtonShow_clicked)

        self.pushButtonClose = QtGui.QPushButton(self)
        self.pushButtonClose.setText("Close Dialogs")
        self.pushButtonClose.clicked.connect(self.on_pushButtonClose_clicked)

        self.layoutHorizontal = QtGui.QHBoxLayout(self)
        self.layoutHorizontal.addWidget(self.labelDialogs)
        self.layoutHorizontal.addWidget(self.spinBoxDialogs)
        self.layoutHorizontal.addWidget(self.pushButtonShow)
        self.layoutHorizontal.addWidget(self.pushButtonClose)

    @QtCore.pyqtSlot()
    def on_pushButtonShow_clicked(self): 
        self._dialogs = []
        dialogsNumber = self.spinBoxDialogs.value()

        for dialogNumber in range(dialogsNumber):  
            dialog = MyDialog(self.modelSource)
            dialog.show()
            dialog.move(100, 100)

            self._dialogs.append(dialog)

    @QtCore.pyqtSlot()
    def on_pushButtonClose_clicked(self): 
        for dialog in self._dialogs:
            dialog.close()

        self._dialogs = []

if __name__ == "__main__":
    import sys

    app = QtGui.QApplication(sys.argv)
    app.setApplicationName('MyWindow')

    main = MyWindow()
    main.show()

    sys.exit(app.exec_())