RangeValuePattern.RangeValuePatternInformation.IsReadOnly Vlastnost
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Získá hodnotu, která určuje, zda hodnota ui Automation element je jen pro čtení.
public:
property bool IsReadOnly { bool get(); };
public bool IsReadOnly { get; }
member this.IsReadOnly : bool
Public ReadOnly Property IsReadOnly As Boolean
Hodnota vlastnosti
true
pokud je hodnota jen pro čtení; false
pokud je možné ho upravit. Výchozí formát je true
.
Příklady
V následujícím příkladu má objekt AutomationElement , který podporuje RangeValuePattern vzor ovládacího prvku, svou hodnotu stupňovanou nebo degradovanou hodnotou specifickou LargeChange pro ovládací prvek.
SetRangeValue(targetControl[0], rangeValuePattern.Current.LargeChange, -1);
SetRangeValue(targetControl(0), rangeValuePattern.Current.LargeChange, - 1)
///--------------------------------------------------------------------
/// <summary>
/// Sets the range value of the control of interest.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <param name="rangeValue">
/// The value (either relative or absolute) to set the control to.
/// </param>
/// <param name="rangeDirection">
/// The value used to specify the direction of adjustment.
/// </param>
///--------------------------------------------------------------------
private void SetRangeValue(
AutomationElement targetControl,
double rangeValue,
double rangeDirection)
{
if (targetControl == null || rangeValue == 0 || rangeDirection == 0)
{
throw new ArgumentException("Argument cannot be null or zero.");
}
RangeValuePattern rangeValuePattern =
GetRangeValuePattern(targetControl);
if (rangeValuePattern.Current.IsReadOnly)
{
throw new InvalidOperationException("Control is read-only.");
}
rangeValue = rangeValue * Math.Sign(rangeDirection);
try
{
if ((rangeValue <= rangeValuePattern.Current.Maximum) ||
(rangeValue >= rangeValuePattern.Current.Minimum))
{
rangeValuePattern.SetValue(rangeValue);
}
}
catch (ArgumentOutOfRangeException)
{
// TO DO: Error handling.
}
catch (ArgumentException)
{
// TO DO: Error handling.
}
}
'''--------------------------------------------------------------------
''' <summary>
''' Sets the range value of the control of interest.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <param name="rangeValue">
''' The value (either relative or absolute) to set the control to.
''' </param>
''' <param name="rangeDirection">
''' The value used to specify the direction of adjustment.
''' </param>
'''--------------------------------------------------------------------
Private Overloads Sub SetRangeValue( _
ByVal targetControl As AutomationElement, _
ByVal rangeValue As Double, ByVal rangeDirection As Double)
If targetControl Is Nothing OrElse _
rangeValue = 0 OrElse rangeDirection = 0 Then
Throw New ArgumentException("Argument cannot be null or zero.")
End If
Dim rangeValuePattern As RangeValuePattern = _
GetRangeValuePattern(targetControl)
If rangeValuePattern.Current.IsReadOnly Then
Throw New InvalidOperationException("Control is read-only.")
End If
rangeValue = rangeValue * Math.Sign(rangeDirection)
Try
If rangeValue <= rangeValuePattern.Current.Maximum OrElse _
rangeValue >= rangeValuePattern.Current.Minimum Then
rangeValuePattern.SetValue(rangeValue)
End If
Catch exc As ArgumentOutOfRangeException
' TO DO: Error handling.
Catch exc As ArgumentException
' TO DO: Error handling.
End Try
End Sub
///--------------------------------------------------------------------
/// <summary>
/// Obtains a RangeValuePattern control pattern from an
/// automation element.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <returns>
/// A RangeValuePattern object.
/// </returns>
///--------------------------------------------------------------------
private RangeValuePattern GetRangeValuePattern(
AutomationElement targetControl)
{
RangeValuePattern rangeValuePattern = null;
try
{
rangeValuePattern =
targetControl.GetCurrentPattern(
RangeValuePattern.Pattern)
as RangeValuePattern;
}
// Object doesn't support the
// RangeValuePattern control pattern
catch (InvalidOperationException)
{
return null;
}
return rangeValuePattern;
}
'''--------------------------------------------------------------------
''' <summary>
''' Obtains a RangeValuePattern control pattern from an
''' automation element.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <returns>
''' A RangeValuePattern object.
''' </returns>
'''--------------------------------------------------------------------
Private Function GetRangeValuePattern( _
ByVal targetControl As AutomationElement) As RangeValuePattern
Dim rangeValuePattern As RangeValuePattern = Nothing
Try
rangeValuePattern = DirectCast( _
targetControl.GetCurrentPattern(rangeValuePattern.Pattern), _
RangeValuePattern)
Catch exc As InvalidOperationException
' Object doesn't support the
' RangeValuePattern control pattern
Return Nothing
End Try
Return rangeValuePattern
End Function 'GetRangeValuePattern
Poznámky
Ovládací prvek by měl mít IsEnabledProperty před vytvořením objektu RangeValuePattern nastavený true
na a IsReadOnlyProperty nafalse
.