TreeWalker(Condition) Construtor
Definição
Importante
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Inicializa uma nova instância da TreeWalker classe.
public:
TreeWalker(System::Windows::Automation::Condition ^ condition);public TreeWalker(System.Windows.Automation.Condition condition);new System.Windows.Automation.TreeWalker : System.Windows.Automation.Condition -> System.Windows.Automation.TreeWalkerPublic Sub New (condition As Condition)Parâmetros
- condition
- Condition
A vista da árvore de Automatização da Interface de Utilizador elementos que TreeWalker irá navegar.
Exemplos
O exemplo seguinte mostra como se pode construir um TreeWalker que navega apenas entre elementos habilitados.
/// <summary>
/// Walks the UI Automation tree and adds the control type of each enabled control
/// element it finds to a TreeView.
/// </summary>
/// <param name="rootElement">The root of the search on this iteration.</param>
/// <param name="treeNode">The node in the TreeView for this iteration.</param>
/// <remarks>
/// This is a recursive function that maps out the structure of the subtree beginning at the
/// UI Automation element passed in as rootElement on the first call. This could be, for example,
/// an application window.
/// CAUTION: Do not pass in AutomationElement.RootElement. Attempting to map out the entire subtree of
/// the desktop could take a very long time and even lead to a stack overflow.
/// </remarks>
private void WalkEnabledElements(AutomationElement rootElement, TreeNode treeNode)
{
Condition condition1 = new PropertyCondition(AutomationElement.IsControlElementProperty, true);
Condition condition2 = new PropertyCondition(AutomationElement.IsEnabledProperty, true);
TreeWalker walker = new TreeWalker(new AndCondition(condition1, condition2));
AutomationElement elementNode = walker.GetFirstChild(rootElement);
while (elementNode != null)
{
TreeNode childTreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType);
WalkEnabledElements(elementNode, childTreeNode);
elementNode = walker.GetNextSibling(elementNode);
}
}
''' <summary>
''' Walks the UI Automation tree and adds the control type of each enabled control
''' element it finds to a TreeView.
''' </summary>
''' <param name="rootElement">The root of the search on this iteration.</param>
''' <param name="treeNode">The node in the TreeView for this iteration.</param>
''' <remarks>
''' This is a recursive function that maps out the structure of the subtree beginning at the
''' UI Automation element passed in as rootElement on the first call. This could be, for example,
''' an application window.
''' CAUTION: Do not pass in AutomationElement.RootElement. Attempting to map out the entire subtree of
''' the desktop could take a very long time and even lead to a stack overflow.
''' </remarks>
Private Sub WalkEnabledElements(ByVal rootElement As AutomationElement, ByVal treeNode As TreeNode)
Dim condition1 As New PropertyCondition(AutomationElement.IsControlElementProperty, True)
Dim condition2 As New PropertyCondition(AutomationElement.IsEnabledProperty, True)
Dim walker As New TreeWalker(New AndCondition(condition1, condition2))
Dim elementNode As AutomationElement = walker.GetFirstChild(rootElement)
While (elementNode IsNot Nothing)
Dim childTreeNode As TreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType)
WalkEnabledElements(elementNode, childTreeNode)
elementNode = walker.GetNextSibling(elementNode)
End While
End Sub
Observações
Automatização da Interface de Utilizador elementos que não correspondem a condition são ignorados quando TreeWalker é usado para navegar na árvore de elementos.
Se a sua aplicação cliente tentar encontrar elementos na sua própria interface de utilizador, deve fazer todas as chamadas de Automatização da Interface de Utilizador numa thread separada.
