(PyQt) 从外部按钮 class 中取消选中按钮？

Question

设置了一个 QPushButton 'asCheckable'。从那里切换，一个 class 布尔值被改变。
这个改变的 bool 允许另一个 class 中的方法继续，并且在这个外部方法完成后我需要 return 按钮到它的初始状态，'setChecked(False)'.

虽然我能够在此外部方法结束时将 return 内含的 class 布尔值设置为默认状态，但我无法从外部访问取消单击按钮的方法。

我假设它是由于 classes init 中的参数，但这些是必要的 - 我想知道是否有另一种方法来实现描述的工作流程。

相关代码片段如下：

（有问题的命令在'Class 2'的底部区分）

Class 1:

class shapeCSVeditor(QtGui.QDialog, QtGui.QWidget):
   valueShare = []
   rowOverride = False#  <<=== equivalent to 'override' in 'Class 2'
   def __init__(self, iface, fileName, editorType, parent=None):
       super(shapeCSVeditor, self).__init__(parent)
       self.iface = iface
       self.editorType = editorType
       self.fileName = filename
       self.pushButtonSetBase = QtGui.QPushButton(self)
       self.pushButtonSetBase.setText("Set Base Shape")
       self.pushButtonSetBase.setCheckable(True)
       self.pushButtonSetBase.toggled.connect(self.on_pushButtonSetBase_toggled)
       self.layoutHorizontal.addWidget(self.pushButtonSetBase)

   #some other things here...

   @QtCore.pyqtSlot()
   def on_pushButtonSetBase_toggled(self):
       shapeCSVeditor.rowOverride = True
       pass

   def on_BaseRow_Changed(self):
       self.pushButtonSetBase.setChecked(False)
       return

Class 2:

class CSVModel(QtCore.QAbstractTableModel):

  # Establish inital settings and branch processes
  def __init__(self, iface, fileName, editorType, parent=None):
      super(CSVModel,self).__init__()
      self.propertiesFile = r'some file'
      self.areaStressFile = r'some other file'          
      self.iface = iface
      self.rows = []
      self.editorType = editorType
      self.loadCSV()
      self.iface.mapCanvas().selectionChanged.connect(self.addRow)

  # add rows to the TableView based on object selection(s) in Qgis.mapCanvas
  def addRow(self):
      override = shapeCSVeditor.rowOverride
      selectedFeatures = selectedLayer.selectedFeatures()
      if override:
          for feature in selectedFeatures:
              self.rows.pop(0)
              feat_Attributes = []
              feat_Attributes.extend([self.iface.activeLayer().name()+'_'+str(feature.id())])
              feat_Attributes.extend(['',]*(len(self.header)-1))
              self.beginResetModel()
              self.rows.insert(0,feat_Attributes)
              shapeCSVeditor.rowOverride = False
              self.endResetModel()

              shapeCSVeditor.on_BaseRow_Changed# <<<=== wrong-diddily!

              break

PS - 如果将括号添加到 'shapeCSVeditor()' 按钮 class 中引用的 3 个参数是必需的，并且如果将括号添加到 'on_BaseRow_Changed'，则return 是；

TypeError: unbound method on_BaseRow_Changed() must be called with shapeCSVeditor instance as first argument (got nothing instead)

Answer 1

你的做法很奇怪。在 python 中，class 方法的第一个参数始终是对象本身。所以，在你的：

   def on_BaseRow_Changed(self):
       self.pushButtonSetBase.setChecked(False)
       # return => This return is useless

如果您不提供对象，则无法访问按钮。

你没有给我们所有的代码，但我认为你应该为你的 addRow 提供你想要更新的 shapeCSVeditor 对象：

def addRow(self, shapeCSVObj):
   override = shapeCSVObj.rowOverride
   if override:
      for feature in selectedFeatures:
          self.rows.pop(0)
          feat_Attributes = []
          feat_Attributes.extend([self.iface.activeLayer().name()+'_'+str(feature.id())])
          feat_Attributes.extend(['',]*(len(self.header)-1))
          self.beginResetModel()
          self.rows.insert(0,feat_Attributes)
          shapeCSVObj.rowOverride = False
          self.endResetModel()

          shapeCSVObj.on_BaseRow_Changed()

          break

你必须在某处创建一个 shapeCSVeditor。您应该在 class.

之外提供给您

希望对您有所帮助。

Answer 2

class shapeCSVeditor(QtGui.QDialog, QtGui.QWidget):
    valueShare = []
    rowOverride = False
    def __init__(self, iface, fileName, editorType, parent=None):
        super(shapeCSVeditor, self).__init__(parent)
        self.iface = iface
        self.editorType = editorType
        self.fileName = fileName
        self.tableView = QtGui.QTableView(self)
        self.setWindowFlags(self.windowFlags() | QtCore.Qt.WindowStaysOnTopHint)
        self.tableData = CSVModel(self,iface,fileName,editorType)
               ^^==not implementing 'self' (shapeCSVeditor object) was the problem!
        self.tableView.setModel(self.tableData)
        ...
        self.pushButtonSetBase = QtGui.QPushButton(self)
        self.pushButtonSetBase.setText("Set Base Shape")
        self.pushButtonSetBase.setCheckable(True)
        self.pushButtonSetBase.clicked.connect(self.on_pushButtonSetBase_toggled)
        ...
    @QtCore.pyqtSlot()
    def on_pushButtonSetBase_toggled(self):
        self.rowOverride = True

    @QtCore.pyqtSlot()
    def on_BaseRow_Changed(self):
        self.rowOverride = False
        self.pushButtonSetBase.setChecked(False)

///////////////////////////////////////////////////////////////////////////////////////

class CSVModel(QtCore.QAbstractTableModel):
    def __init__(self, shapeCSVeditor, iface, fileName, editorType):
        super(CSVModel,self).__init__()
        self.propertiesFile = r'foo'
        self.areaStressFile = r'bar'
        self.tableView = shapeCSVeditor  <<== proper passing of shapeCSVeditor object! (?)
        self.iface = iface
        self.rows = []
        self.editorType = editorType
        self.loadCSV()
        self.iface.mapCanvas().selectionChanged.connect(self.addRow)

        ...

    def addRow(self):
        selectedFeatures = selectedLayer.selectedFeatures()
        if self.tableView.rowOverride:
            for feature in selectedFeatures:
                self.rows.pop(0)
                feat_Attributes = []
                feat_Attributes.extend([self.iface.activeLayer().name()+'_'+str(feature.id())])
                feat_Attributes.extend(['',]*(len(self.header)-1))
                self.beginResetModel()
                self.rows.insert(0,feat_Attributes)
                self.endResetModel()
                self.tableView.rowOverride = False
                self.tableView.on_BaseRow_Changed()

激进。满足当前需求。现在的问题是它是否适合 python 'standards'。对写作很陌生，所以可能还有更多需要修复。

非常感谢 Plouff 提供的线索。

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