arcgis二次开发撤销

ArcGIS二次开发中实现撤销操作的思路一般是在进行编辑操作时，将每一步操作都保存为一个历史记录，然后在需要撤销操作时，依次从历史记录中取出上一个操作，并执行相应的撤销操作即可。以下是一个简单的实现示例：

1.先定义一个操作历史记录类，用于保存每一步操作：

class OperationHistory:
    def __init__(self):
        self.history = []

    def push(self, operation):
        self.history.append(operation)

    def pop(self):
        if len(self.history) > 0:
            return self.history.pop()
        else:
            return None

2.在进行编辑操作时，将每一步操作保存到历史记录中：

history = OperationHistory()

def add_feature(layer, feature):
    # 添加要素
    layer.addFeature(feature)
    # 将操作保存到历史记录中
    history.push(('add', feature))

def delete_feature(layer, feature):
    # 删除要素
    layer.deleteFeature(feature)
    # 将操作保存到历史记录中
    history.push(('delete', feature))

def update_feature(layer, feature, new_attributes):
    # 更新要素属性
    layer.updateFeature(feature, new_attributes)
    # 将操作保存到历史记录中
    history.push(('update', feature, new_attributes))

3.在需要撤销操作时，依次从历史记录中取出上一个操作，并执行相应的撤销操作：

def undo():
    last_operation = history.pop()
    if last_operation is not None:
        operation_type = last_operation[0]
        if operation_type == 'add':
            # 撤销添加操作
            layer = get_layer()
            feature = last_operation[1]
            layer.deleteFeature(feature)
        elif operation_type == 'delete':
            # 撤销删除操作
            layer = get_layer()
            feature = last_operation[1]
            layer.addFeature(feature)
        elif operation_type == 'update':
            # 撤销更新操作
            layer = get_layer()
            feature = last_operation[1]
            old_attributes = feature.getAttributes()
            new_attributes = last_operation[2]
            layer.updateFeature(feature, old_attributes)

以上是一个简单的实现示例，具体实现方式可能因应用场景的不同而有所差异。