利用 UI 自動化取得混合文字屬性的詳細資料
注意
本文件適用對象為 .NET Framework 開發人員，其想要使用 System.Windows.Automation 命名空間中定義的受控 UI 自動化類別。 如需 UI 自動化的最新資訊，請參閱 Windows 自動化 API：UI 自動化。
本主題說明如何使用 Microsoft UI Automation，從跨越多個屬性值的文字範圍中取得文字的屬性詳細資料。 文字範圍可以對應至文件內目前的插入號位置 (或變質選取範圍)、連續文字選取範圍、非連續文字選取範圍的集合，或文件的整個文字內容。
範例
下列程式碼範例說明如何取得文字範圍中的 FontNameAttribute ，其中 GetAttributeValue 會傳回 MixedAttributeValue 物件。
///--------------------------------------------------------------------
/// <summary>
/// Display the target selection with attribute details in client.
/// </summary>
/// <param name="selectedText">The current target selection.</param>
///--------------------------------------------------------------------
private void DisplaySelectedTextWithAttributes(string selectedText)
{
targetSelection.Text = selectedText;
// We're only interested in the FontNameAttribute for the purposes
// of this sample.
targetSelectionAttributes.Text =
ParseTextRangeByAttribute(
selectedText, TextPattern.FontNameAttribute);
}
///--------------------------------------------------------------------
/// <summary>
/// Parse the target selection based on the text attribute of interest.
/// </summary>
/// <param name="selectedText">The current target selection.</param>
/// <param name="automationTextAttribute">
/// The text attribute of interest.
/// </param>
/// <returns>
/// A string representing the requested attribute details.
/// </returns>
///--------------------------------------------------------------------
private string ParseTextRangeByAttribute(
string selectedText,
AutomationTextAttribute automationTextAttribute)
{
StringBuilder attributeDetails = new StringBuilder();
// Initialize the current attribute value.
string attributeValue = "";
// Make a copy of the text range.
TextPatternRange searchRangeClone = searchRange.Clone();
// Collapse the range to the starting endpoint.
searchRangeClone.Move(TextUnit.Character, -1);
// Iterate through the range character by character.
for (int x = 1; x <= selectedText.Length; x++)
{
searchRangeClone.Move(TextUnit.Character, 1);
// Get the attribute value of the current character.
string newAttributeValue =
searchRangeClone.GetAttributeValue(automationTextAttribute).ToString();
// If the new attribute value is not equal to the old then report
// the new value along with its location within the range.
if (newAttributeValue != attributeValue)
{
attributeDetails.Append(automationTextAttribute.ProgrammaticName)
.Append(":\n<")
.Append(newAttributeValue)
.Append("> at text range position ")
.AppendLine(x.ToString());
attributeValue = newAttributeValue;
}
}
return attributeDetails.ToString();
}
'--------------------------------------------------------------------
' Display the target selection with attribute details in client.
' <param name="selectedText">The current target selection.</param>
'--------------------------------------------------------------------
Private Sub DisplaySelectedTextWithAttributes(ByVal selectedText As String)
targetSelection.Text = selectedText
' We're only interested in the FontNameAttribute for the purposes
' of this sample.
targetSelectionAttributes.Text = _
ParseTextRangeByAttribute( _
selectedText, TextPattern.FontNameAttribute)
End Sub
'--------------------------------------------------------------------
' Parse the target selection based on the text attribute of interest.
' <param name="selectedText">The current target selection.</param>
' <param name="automationTextAttribute">
' The text attribute of interest.
' A string representing the requested attribute details.
'--------------------------------------------------------------------
Function ParseTextRangeByAttribute( _
ByVal selectedText As String, _
ByVal automationTextAttribute As AutomationTextAttribute) As String
Dim attributeDetails As StringBuilder = New StringBuilder()
' Initialize the current attribute value.
Dim attributeValue As String = ""
' Make a copy of the text range.
Dim searchRangeClone As TextPatternRange = searchRange.Clone()
' Collapse the range to the starting endpoint.
searchRangeClone.Move(TextUnit.Character, -1)
' Iterate through the range character by character.
Dim x As Integer
For x = 1 To selectedText.Length
searchRangeClone.Move(TextUnit.Character, 1)
' Get the attribute value of the current character.
Dim newAttributeValue As String = _
searchRangeClone.GetAttributeValue(automationTextAttribute).ToString()
' If the new attribute value is not equal to the old then report
' the new value along with its location within the range.
If (newAttributeValue <> attributeValue) Then
attributeDetails.Append(automationTextAttribute.ProgrammaticName) _
.Append(":") _
.Append(vbLf) _
.Append("<") _
.Append(newAttributeValue) _
.Append("> at text range position ") _
.AppendLine(x.ToString())
attributeValue = newAttributeValue
End If
Next
Return attributeDetails.ToString()
End Function
TextPattern 控制項模式 (結合 TextPatternRange 類別) 可支援基本文字屬性 (Attribute)、屬性 (Property) 及方法。 如果是 TextPattern 或 TextPatternRange不支援的控制項特定功能， AutomationElement 類別會提供使用者介面自動化用戶端方法，以存取對應的原生物件模型。