TextPatternRange.CompareEndpoints 方法

定義

命名空間:

System.Windows.Automation.Text

組件:

UIAutomationClient.dll

傳回 Int32，表示兩個文字範圍是否有相同的端點。

public:
 int CompareEndpoints(System::Windows::Automation::Text::TextPatternRangeEndpoint endpoint, System::Windows::Automation::Text::TextPatternRange ^ targetRange, System::Windows::Automation::Text::TextPatternRangeEndpoint targetEndpoint);

public int CompareEndpoints (System.Windows.Automation.Text.TextPatternRangeEndpoint endpoint, System.Windows.Automation.Text.TextPatternRange targetRange, System.Windows.Automation.Text.TextPatternRangeEndpoint targetEndpoint);

member this.CompareEndpoints : System.Windows.Automation.Text.TextPatternRangeEndpoint * System.Windows.Automation.Text.TextPatternRange * System.Windows.Automation.Text.TextPatternRangeEndpoint -> int

Public Function CompareEndpoints (endpoint As TextPatternRangeEndpoint, targetRange As TextPatternRange, targetEndpoint As TextPatternRangeEndpoint) As Integer

參數

endpoint

TextPatternRangeEndpoint

呼叫端的 Start 或 End 端點。

targetRange

TextPatternRange

比較的目標範圍。

targetEndpoint

TextPatternRangeEndpoint

目標的 Start 或 End 端點。

傳回

Int32

如果呼叫端的端點在文字中比目標端點更早出現，則傳回負值。

如果呼叫端的端點與目標端點在相同位置，則傳回零。

如果呼叫端的端點在文字中比目標端點更晚出現，則傳回正值。

例外狀況

ArgumentNullException

如果範圍是 Null 參考 (在 Visual Basic 中為 Nothing)。

ArgumentException

如果範圍來自另一個容器。

範例

private Int32 CompareRangeEndpoints(AutomationElement target)
{
    // Specify the control type we're looking for, in this case 'Document'
    PropertyCondition cond = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document);

    // target --> The root AutomationElement.
    AutomationElement textProvider = target.FindFirst(TreeScope.Descendants, cond);

    TextPattern textpatternPattern = textProvider.GetCurrentPattern(TextPattern.Pattern) as TextPattern;

    if (textpatternPattern == null)
    {
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.");
        return 0;
    }
    TextPatternRange[] currentSelections = textpatternPattern.GetSelection();
    TextPatternRange[] currentVisibleRanges = textpatternPattern.GetVisibleRanges();
    return currentSelections[0].CompareEndpoints(
        TextPatternRangeEndpoint.Start, 
        currentVisibleRanges[0], 
        TextPatternRangeEndpoint.Start);
}

Private Function CompareRangeEndpoints(ByVal target As AutomationElement) As Integer
    ' Specify the control type we're looking for, in this case 'Document'
    Dim cond As PropertyCondition = New PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document)

    ' target --> The root AutomationElement.
    Dim textProvider As AutomationElement = target.FindFirst(TreeScope.Descendants, cond)

    Dim textpatternPattern As TextPattern = CType(textProvider.GetCurrentPattern(TextPattern.Pattern), TextPattern)

    If (textpatternPattern Is Nothing) Then
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.")
        Return Nothing
    End If
    Dim currentSelection As TextPatternRange() = textpatternPattern.GetSelection()
    Dim currentVisibleRanges As TextPatternRange() = textpatternPattern.GetVisibleRanges()
    Return currentSelection(0).CompareEndpoints(TextPatternRangeEndpoint.Start, _
                                         currentVisibleRanges(0), _
                                         TextPatternRangeEndpoint.Start)
End Function

備註

藉由比較相同文字範圍的開始和結束端點，您可以識別文字範圍是否變質，或端點是否依邏輯文字流程的順序。

另請參閱

• TextPatternRangeEndpoint