所有findView*()
方法都接收一个root
参数,该参数指示发生搜索的树的根。
例如:
def findViewById(self, viewId, root="ROOT", viewFilter=None):
'''
Finds the View with the specified viewId.
@type viewId: str
@param viewId: the ID of the view to find
@type root: str
@type root: View
@param root: the root node of the tree where the View will be searched
@type: viewFilter: function
@param viewFilter: a function that will be invoked providing the candidate View as a parameter
and depending on the return value (C{True} or C{False}) the View will be
selected and returned as the result of C{findViewById()} or ignored.
This can be C{None} and no extra filtering is applied.
@return: the C{View} found or C{None}
'''
此外,您可以使用自己遍历视图树
def traverse(self, root="ROOT", indent="", transform=View.__str__, stream=sys.stdout):
'''
Traverses the C{View} tree and prints its nodes.
The nodes are printed converting them to string but other transformations can be specified
by providing a method name as the C{transform} parameter.
@type root: L{View}
@param root: the root node from where the traverse starts
@type indent: str
@param indent: the indentation string to use to print the nodes
@type transform: method
@param transform: a method to use to transform the node before is printed
'''