TextPatternRange.CompareEndpoints 方法

定义

命名空间:

System.Windows.Automation.Text

程序集:

UIAutomationClient.dll

返回一个指出两个文本范围是否具有相同端点的 Int32 值。

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

参数

endpoint

TextPatternRangeEndpoint

调用方的 Start 或 End 端点。

targetRange

TextPatternRange

要进行比较的目标范围。

targetEndpoint

TextPatternRangeEndpoint

目标方的 Start 或 End 端点。

返回

Int32

如果调用方的端点在文本中比目标端点先出现，则返回一个负值。

如果调用方的端点与目标端点处于同一位置，则返回零。

如果调用方的端点在文本中比目标端点后出现，则返回一个正值。

例外

ArgumentNullException

如果范围是空引用（在 Visual Basic 中为 Nothing）。

ArgumentException

如果范围来自其他容器。

示例

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

注解

通过比较同一文本范围的起始终结点和结束终结点，可以确定文本范围是否退化，或者终结点是否按逻辑文本流顺序排列。

另请参阅

• TextPatternRangeEndpoint