ScrollPattern.SetScrollPercent(Double, Double) Metode
Definisi
Penting
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Mengatur posisi gulir horizontal dan/atau vertikal sebagai persentase dari total area konten dalam AutomationElement.
public:
void SetScrollPercent(double horizontalPercent, double verticalPercent);
public void SetScrollPercent (double horizontalPercent, double verticalPercent);
member this.SetScrollPercent : double * double -> unit
Public Sub SetScrollPercent (horizontalPercent As Double, verticalPercent As Double)
Parameter
- horizontalPercent
- Double
Persentase dari total area konten horizontal. NoScroll harus diteruskan jika kontrol tidak dapat digulir ke arah ini.
- verticalPercent
- Double
Persentase dari total area konten vertikal. NoScroll harus diteruskan jika kontrol tidak dapat digulir ke arah ini.
Pengecualian
Nilai yang tidak dapat dikonversi ke ganda diteruskan.
Nilai yang lebih besar dari 100 atau kurang dari 0 diteruskan (kecuali -1, yang setara dengan NoScroll). Nilai HorizontalScrollPercent dan VerticalScrollPercent dinormalisasi menjadi 0% atau 100%.
Upaya dilakukan untuk menggulir ke arah yang tidak didukung.
Contoh
Dalam contoh berikut, ScrollPattern pola kontrol diperoleh dari AutomationElement dan kemudian digunakan untuk menggulir wilayah yang dapat dilihat ke posisi 'beranda' kiri atas area konten.
///--------------------------------------------------------------------
/// <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 to the 'home' position.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
///--------------------------------------------------------------------
private void ScrollHome(AutomationElement targetControl)
{
if (targetControl == null)
{
throw new ArgumentNullException(
"AutomationElement argument cannot be null.");
}
ScrollPattern scrollPattern = GetScrollPattern(targetControl);
if (scrollPattern == null)
{
return;
}
try
{
scrollPattern.SetScrollPercent(0, 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 left 'home' position.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
'''--------------------------------------------------------------------
Private Sub ScrollHome(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)
If scrollPattern Is Nothing Then
Return
End If
Try
scrollPattern.SetScrollPercent(0, 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
Keterangan
Metode ini hanya berguna ketika area konten kontrol lebih besar dari wilayah yang terlihat.
Meneruskan nilai NoScroll menunjukkan bahwa tidak ada pengguliran ke arah yang ditentukan.