ScrollPattern.Scroll(ScrollAmount, ScrollAmount) Metode
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Menggulir wilayah area konten yang terlihat secara horizontal dan vertikal.
public:
void Scroll(System::Windows::Automation::ScrollAmount horizontalAmount, System::Windows::Automation::ScrollAmount verticalAmount);
public void Scroll (System.Windows.Automation.ScrollAmount horizontalAmount, System.Windows.Automation.ScrollAmount verticalAmount);
member this.Scroll : System.Windows.Automation.ScrollAmount * System.Windows.Automation.ScrollAmount -> unit
Public Sub Scroll (horizontalAmount As ScrollAmount, verticalAmount As ScrollAmount)
Parameter
- horizontalAmount
- ScrollAmount
Kenaikan horizontal khusus untuk kontrol. NoScroll harus diteruskan jika kontrol tidak dapat digulir ke arah ini.
- verticalAmount
- ScrollAmount
Kenaikan vertikal khusus untuk kontrol. NoScroll harus diteruskan jika kontrol tidak dapat digulir ke arah ini.
Pengecualian
Kontrol mendukung SmallIncrement nilai secara eksklusif untuk pengguliran horizontal atau vertikal tetapi LargeIncrement nilai diteruskan.
Upaya dilakukan untuk menggulir ke arah yang tidak didukung.
Contoh
Dalam contoh berikut, ScrollPattern pola kontrol diperoleh dari AutomationElement dan kemudian digunakan untuk menggulir elemen dengan jumlah yang diminta baik secara horizontal maupun vertikal.
///--------------------------------------------------------------------
/// <summary>
/// Obtains a ScrollPattern control pattern from an
/// automation element.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <returns>
/// A ScrollPattern object.
/// </returns>
///--------------------------------------------------------------------
private ScrollPattern GetScrollPattern(
AutomationElement targetControl)
{
ScrollPattern scrollPattern = null;
try
{
scrollPattern =
targetControl.GetCurrentPattern(
ScrollPattern.Pattern)
as ScrollPattern;
}
// Object doesn't support the ScrollPattern control pattern
catch (InvalidOperationException)
{
return null;
}
return scrollPattern;
}
'''--------------------------------------------------------------------
''' <summary>
''' Obtains a ScrollPattern control pattern from an
''' automation element.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <returns>
''' A ScrollPattern object.
''' </returns>
'''--------------------------------------------------------------------
Private Function GetScrollPattern( _
ByVal targetControl As AutomationElement) As ScrollPattern
Dim scrollPattern As ScrollPattern = Nothing
Try
scrollPattern = DirectCast( _
targetControl.GetCurrentPattern(scrollPattern.Pattern), _
ScrollPattern)
Catch
' Object doesn't support the ScrollPattern control pattern
Return Nothing
End Try
Return scrollPattern
End Function 'GetScrollPattern
///--------------------------------------------------------------------
/// <summary>
/// Obtains a ScrollPattern control pattern from an automation
/// element and attempts to scroll the requested amounts.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <param name="hScrollAmount">
/// The requested horizontal scroll amount.
/// </param>
/// <param name="vScrollAmount">
/// The requested vertical scroll amount.
/// </param>
///--------------------------------------------------------------------
private void ScrollElement(
AutomationElement targetControl,
ScrollAmount hScrollAmount,
ScrollAmount vScrollAmount)
{
if (targetControl == null)
{
throw new ArgumentNullException(
"AutomationElement argument cannot be null.");
}
ScrollPattern scrollPattern = GetScrollPattern(targetControl);
if (scrollPattern == null)
{
return;
}
try
{
scrollPattern.Scroll(hScrollAmount, vScrollAmount);
}
catch (InvalidOperationException)
{
// Control not able to scroll in the direction requested;
// when scrollable property of that direction is False
// TO DO: error handling.
}
catch (ArgumentException)
{
// If a control supports SmallIncrement values exclusively
// for horizontal or vertical scrolling but a LargeIncrement
// value (NaN if not supported) is passed in.
// TO DO: error handling.
}
}
'''--------------------------------------------------------------------
''' <summary>
''' Obtains a ScrollPattern control pattern from an automation
''' element and attempts to scroll the requested amounts.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <param name="hScrollAmount">
''' The requested horizontal scroll amount.
''' </param>
''' <param name="vScrollAmount">
''' The requested vertical scroll amount.
''' </param>
'''--------------------------------------------------------------------
Private Sub ScrollElement( _
ByVal targetControl As AutomationElement, _
ByVal hScrollAmount As ScrollAmount, _
ByVal vScrollAmount As ScrollAmount)
If targetControl Is Nothing Then
Throw New ArgumentNullException( _
"AutomationElement argument cannot be null.")
End If
Dim scrollPattern As ScrollPattern = GetScrollPattern(targetControl)
If scrollPattern Is Nothing Then
Return
End If
Try
scrollPattern.Scroll(hScrollAmount, vScrollAmount)
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 ArgumentException
' If a control supports SmallIncrement values exclusively
' for horizontal or vertical scrolling but a LargeIncrement
' value (NaN if not supported) is passed in.
' TO DO: error handling.
End Try
End Sub
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