ScrollPattern.NoScroll 字段

定义

命名空间:

System.Windows.Automation

程序集:

UIAutomationClient.dll

指定不应执行滚动。

public: double NoScroll = -1;

public const double NoScroll = -1;

val mutable NoScroll : double

Public Const NoScroll As Double  = -1

字段值

Value = -1

Double

示例

在以下示例中 ScrollPattern ，从 AutomationElement 获取控件模式，然后使用 该模式将可查看区域滚动到内容区域的顶部。

///--------------------------------------------------------------------
/// <summary>
/// Obtains a ScrollPattern control pattern from an automation 
/// element and attempts to scroll to the top of the
/// viewfinder.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
///--------------------------------------------------------------------
private void ScrollToTop(AutomationElement targetControl)
{
    if (targetControl == null)
    {
        throw new ArgumentNullException(
            "AutomationElement argument cannot be null.");
    }

    ScrollPattern scrollPattern = GetScrollPattern(targetControl);

    try
    {
        scrollPattern.SetScrollPercent(ScrollPattern.NoScroll, 0);
    }
    catch (InvalidOperationException)
    {
        // Control not able to scroll in the direction requested;
        // when scrollable property of that direction is False
        // TO DO: error handling.
    }
    catch (ArgumentOutOfRangeException)
    {
        // A value greater than 100 or less than 0 is passed in 
        // (except -1 which is equivalent to NoScroll).
        // TO DO: error handling.
    }
}

'''--------------------------------------------------------------------
''' <summary>
''' Obtains a ScrollPattern control pattern from an automation 
''' element and attempts to scroll to the top of the
''' viewfinder.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
'''--------------------------------------------------------------------
Private Sub ScrollToTop(ByVal targetControl As AutomationElement) 
    If targetControl Is Nothing Then
        Throw New ArgumentNullException( _
        "AutomationElement argument cannot be null.")
    End If
    
    Dim scrollPattern As ScrollPattern = GetScrollPattern(targetControl)
    
    Try
        scrollPattern.SetScrollPercent(ScrollPattern.NoScroll, 0)
    Catch exc As InvalidOperationException
        ' Control not able to scroll in the direction requested;
        ' when scrollable property of that direction is False
        ' TO DO: error handling.
    Catch exc As ArgumentOutOfRangeException
        ' A value greater than 100 or less than 0 is passed in 
        ' (except -1 which is equivalent to NoScroll).
        ' TO DO: error handling.
    End Try

End Sub

注解

此标识符由 UI 自动化客户端应用程序使用。 UI 自动化提供程序应使用 中的 ScrollPatternIdentifiers等效字段。

值 -1 可以替换为 NoScroll 字段。