IRawElementProviderFragmentRoot.GetFocus 方法
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
检索片段中具有输入焦点的元素。
public:
System::Windows::Automation::Provider::IRawElementProviderFragment ^ GetFocus();
public System.Windows.Automation.Provider.IRawElementProviderFragment GetFocus ();
abstract member GetFocus : unit -> System.Windows.Automation.Provider.IRawElementProviderFragment
Public Function GetFocus () As IRawElementProviderFragment
返回
如果有,则为该片段中具有输入焦点的元素的提供程序;否则为 null 引用(Visual Basic 中的 Nothing
)。
示例
下面的代码示例演示了列表框此方法的一个可能实现。 它返回列表中当前选定的项。
/// <summary>
/// Returns the child element that is selected when the list gets focus.
/// </summary>
/// <returns>The selected item.</returns>
/// <remarks>
/// SelectedIndex is a class property that maintains the index of the currently
/// selected item in the myItems collection.</remarks>
IRawElementProviderFragment IRawElementProviderFragmentRoot.GetFocus()
{
if (SelectedIndex >= 0)
{
return (IRawElementProviderFragment)myItems[SelectedIndex];
}
else
{
return null;
}
}
''' <summary>
''' Returns the child element that is selected when the list gets focus.
''' </summary>
''' <returns>The selected item.</returns>
''' <remarks>
''' SelectedIndex is a class property that maintains the index of the currently
''' selected item in the myItems collection.</remarks>
Function GetFocus() As IRawElementProviderFragment _
Implements IRawElementProviderFragmentRoot.GetFocus
If SelectedIndex >= 0 Then
Return DirectCast(myItems(SelectedIndex), IRawElementProviderFragment)
Else
Return Nothing
End If
End Function 'IRawElementProviderFragmentRoot.GetFocus
注解
如果焦点位于此片段托管的另一个框架中的元素上,该方法将返回承载该片段的元素。