TreeWalker.ContentViewWalker Campo
Definição
Importante
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Representa um predefinido TreeWalker contendo uma vista dos elementos da árvore que são marcados como controlos de conteúdo.
public: static initonly System::Windows::Automation::TreeWalker ^ ContentViewWalker;public static readonly System.Windows.Automation.TreeWalker ContentViewWalker; staticval mutable ContentViewWalker : System.Windows.Automation.TreeWalkerPublic Shared ReadOnly ContentViewWalker As TreeWalker Valor de Campo
Exemplos
O exemplo seguinte mostra ControlViewWalker ser usado para construir uma vista em árvore dos elementos numa subárvore. A utilização para ContentViewWalker é idêntica.
/// <summary>
/// Walks the UI Automation tree and adds the control type of each element it finds
/// in the control view 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 WalkControlElements(AutomationElement rootElement, TreeNode treeNode)
{
// Conditions for the basic views of the subtree (content, control, and raw)
// are available as fields of TreeWalker, and one of these is used in the
// following code.
AutomationElement elementNode = TreeWalker.ControlViewWalker.GetFirstChild(rootElement);
while (elementNode != null)
{
TreeNode childTreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType);
WalkControlElements(elementNode, childTreeNode);
elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode);
}
}
''' <summary>
''' Walks the UI Automation tree and adds the control type of each element it finds
''' in the control view 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 WalkControlElements(ByVal rootElement As AutomationElement, ByVal treeNode As TreeNode)
' Conditions for the basic views of the subtree (content, control, and raw)
' are available as fields of TreeWalker, and one of these is used in the
' following code.
Dim elementNode As AutomationElement = TreeWalker.ControlViewWalker.GetFirstChild(rootElement)
While (elementNode IsNot Nothing)
Dim childTreeNode As TreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType)
WalkControlElements(elementNode, childTreeNode)
elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode)
End While
End Sub
Observações
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.