TextPattern.TextChangedEvent Campo

Definição

Namespace:

System.Windows.Automation

Assembly:

UIAutomationClient.dll

Identifica o evento acionado sempre que o conteúdo textual é modificado.

public: static initonly System::Windows::Automation::AutomationEvent ^ TextChangedEvent;

public static readonly System.Windows.Automation.AutomationEvent TextChangedEvent;

 staticval mutable TextChangedEvent : System.Windows.Automation.AutomationEvent

Public Shared ReadOnly TextChangedEvent As AutomationEvent 

Valor do campo

AutomationEvent

Exemplos

// Initialize a text changed listener.
// An instance of TextPatternRange will become invalid if 
// one of the following occurs:
// 1) The text in the provider changes via some user activity.
// 2) ValuePattern.SetValue is used to programatically change 
// the value of the text in the provider.
// The only way the client application can detect if the text 
// has changed (to ensure that the ranges are still valid), 
// is by setting a listener for the TextChanged event of 
// the TextPattern. If this event is raised, the client needs 
// to update the targetDocumentRange member data to ensure the 
// user is working with the updated text. 
// Clients must always anticipate the possibility that the text 
// can change underneath them.
Automation.AddAutomationEventHandler(
    TextPattern.TextChangedEvent,
    targetDocument,
    TreeScope.Element,
    TextChanged);

' Initialize a text changed listener.
' An instance of TextPatternRange will become invalid if 
' one of the following occurs:
' 1) The text in the provider changes via some user activity.
' 2) ValuePattern.SetValue is used to programatically change 
' the value of the text in the provider.
' The only way the client application can detect if the text 
' has changed (to ensure that the ranges are still valid), 
' is by setting a listener for the TextChanged event of 
' the TextPattern. If this event is raised, the client needs 
' to update the targetDocumentRange member data to ensure the 
' user is working with the updated text. 
' Clients must always anticipate the possibility that the text 
' can change underneath them.
Dim onTextChanged As AutomationEventHandler = _
New AutomationEventHandler(AddressOf TextChanged)
Automation.AddAutomationEventHandler( _
TextPattern.TextChangedEvent, targetDocument, TreeScope.Element, onTextChanged)

Comentários

Esse identificador é usado por aplicativos cliente Automação da Interface do Usuário. Automação da Interface do Usuário provedores devem usar o campo equivalente em TextPatternIdentifiers.

Confira também

• TextPatternRange
• AddAutomationEventHandler(AutomationEvent, AutomationElement, TreeScope, AutomationEventHandler)