TextPattern.GetSelection 方法
定义
重要
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检索与当前文本选择（或多个文本选择）关联的不连续文本范围的集合。
public:
cli::array <System::Windows::Automation::Text::TextPatternRange ^> ^ GetSelection();public System.Windows.Automation.Text.TextPatternRange[] GetSelection ();member this.GetSelection : unit -> System.Windows.Automation.Text.TextPatternRange[]Public Function GetSelection () As TextPatternRange()返回
不连续文本范围的集合。
例外
文本容器不支持文本选择。
示例
private TextPatternRange CurrentSelection(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 null;
}
TextPatternRange[] currentSelection = textpatternPattern.GetSelection();
return currentSelection[0];
}
Private Function CurrentSelection(ByVal target As AutomationElement) As TextPatternRange
' 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 currentTextSelection As TextPatternRange() = textpatternPattern.GetSelection()
Return currentTextSelection(0)
End Function
注解
如果未选择任何文本， GetSelection 则返回 (空范围) 在系统游标的位置 (文本插入点的位置) 的退化文本范围。
如果系统光标 (文本插入点) 不存在， GetSelection 可能会返回 null。
备注
使用 SupportedTextSelection 属性测试控件是否支持文本插入点的文本选择或定位。