QGIS 插件：创建动态组合框

Question

我正在创建一个QGIS插件，用户可以在其中根据特定策略将列重命名为指定名称。 在图像中您可以看到，用户在 QGIS 中选择一个图层，该图层的字段名称将填充 mFieldCombobox（“实际名称”），并在第二个组合框中为用户提供在插件中定义的名称列表（以及取决于所选政策）。

但是，图层中应重命名的列数取决于用户的需求，因此我希望他/她能够添加尽可能多的组合框（“实际名称”和“重命名为”）需要。为此，我添加了“+”按钮，按下该按钮后，应该生成一个新的“实际名称”-mFieldCombobox 和一个新的“重命名为”-combobox。

这可能吗？如果可能的话，如何实现？ 非常欢迎任何帮助！

到目前为止我的代码：

    def run(self):
        """Run method that performs all the real work"""

        # Create the dialog with elements (after translation) and keep reference
        # Only create GUI ONCE in callback, so that it will only load when the plugin is started
        if self.first_start == True:
            self.first_start = False
            self.dlg = ReformatToLKNamesDialog()

            # Populate Richtlinien Combobox mit Richtliniennamen
            self.populateRichtinie()

            # Get value from Richtlinie
            self.selected_RL = self.dlg.Richtlinie.currentText()
            self.dlg.Richtlinie.currentTextChanged.connect(self.populateRLS19)

            # Update the combobox with the field names
            self.dlg.LayerName.layerChanged.connect(self.updateFields)

        # show the dialog
        self.dlg.show()

        # Run the dialog event loop
        result = self.dlg.exec_()
        print(type(result))
        # See if OK was pressed
        if result:
            # Write here your code which should run when you hit the button 'OK'
            pass

    def printRL(self):
        self.selected_RL = self.dlg.Richtlinie.currentText()
        if self.selected_RL:
            print(self.dlg.Richtlinie.currentText())

    def updateFields(self):
        self.dlg.mFieldComboBox.clear()
        selectedLayer = self.dlg.LayerName.currentLayer()
        if selectedLayer:
            self.dlg.mFieldComboBox.setLayer(selectedLayer)
   
    def populateRichtinie(self):
        richtlinien = ['RLS-19', 'BUB', 'RLS-90'] # may be added: 'All'
        print(richtlinien)
        self.dlg.Richtlinie.addItems([item for item in richtlinien])


    def populateRLS19(self):
        self.dlg.LKName.clear()
        selectedRichtlinie = self.dlg.Richtlinie.currentText()
        rlkurz = {'st':'sr', 'b':'ra', 'ls':'la'}
        selctedRL_kurzel = rlkurz[selectedRichtlinie]
        print(selctedRL_kurzel)
        rl_kuerzel = [
'list', 'of', 'names']

        rl_f = [selctedRL_kurzel+kuerzel for kuerzel in rl_kuerzel]
        self.dlg.LKName.addItems([item for item in rl_f])

Answer 1

这段代码应该有帮助：

class FieldChanger:
    def __init__(self):
        self.cmbPairList = []  # make cmb accesible as an attribute e.g. for reading values
        self.makeUI()
        self.window.exec()
    
    def makeUI(self):
        """example UI"""

        self.window = QDialog()
        self.mainLayout = QVBoxLayout()
        
        # press this button to add comboboxes
        self.btn_add = QPushButton('Add Combobox Pair')
        self.mainLayout.addWidget(self.btn_add)
        self.btn_add.clicked.connect(self.addCMBPair)

        # press this button to read data from comboboxes in dialog
        self.btn_finished = QPushButton('Done')
        self.mainLayout.addWidget(self.btn_finished)
        self.btn_finished.clicked.connect(self.readSelection)

        self.window.setLayout(self.mainLayout)


    def addCMBPair(self):
        # whenever the add button is clicked ...
        subLayout = QHBoxLayout()  # ... create a horizontal layout

        cmb_left = QComboBox()  # combobox for current field name
        cmb_left.addItem('aFieldNameFromALayer')
        cmb_left.addItem('anotherFieldNameFromALayer')
        subLayout.addWidget(cmb_left)  # add the combobox to the layout 
        
        cmb_right = QComboBox()  # for the new field name
        cmb_right.addItem('aNewName')
        cmb_right.addItem('bNewName')
        subLayout.addWidget(cmb_right) 
        
        self.cmbPairList.append([cmb_left, cmb_right])  # add the boxes to the list (or a dictionary or whatever)
        
        self.mainLayout.addLayout(subLayout)  # and add the sublayout (which contains the comboboxes) to the main layout
    
    def readSelection(self):
        # example for how to get the values from the comboboxes
        for old, new in self.cmbPairList:
            print(old.currentText(), new.currentText())

a = FieldChanger()