ToolStripOverflowButton.CreateAccessibilityInstance Method
Important
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Creates a new accessibility object for the control.
protected:
override System::Windows::Forms::AccessibleObject ^ CreateAccessibilityInstance();
protected override System.Windows.Forms.AccessibleObject CreateAccessibilityInstance ();
override this.CreateAccessibilityInstance : unit -> System.Windows.Forms.AccessibleObject
Protected Overrides Function CreateAccessibilityInstance () As AccessibleObject
A new AccessibleObject for the control.
The following code example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. The control plots two curves along with a legend. The ChartControlAccessibleObject
class, which derives from ControlAccessibleObject
, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. Since the chart legend is not an actual Control -based control, but instead is drawn by the chart control, it does not any built-in accessible information. Because of this, the ChartControlAccessibleObject
class overrides the GetChild method to return the CurveLegendAccessibleObject
that represents accessible information for each part of the legend. When an accessible-aware application uses this control, the control can provide the necessary accessible information.
This code excerpt demonstrates overriding the CreateAccessibilityInstance method. See the AccessibleObject class overview for the complete code example.
protected:
// Overridden to return the custom AccessibleObject
// for the entire chart.
virtual AccessibleObject^ CreateAccessibilityInstance() override
{
return gcnew ChartControlAccessibleObject( this );
}
// Overridden to return the custom AccessibleObject
// for the entire chart.
protected override AccessibleObject CreateAccessibilityInstance()
{
return new ChartControlAccessibleObject(this);
}
' Overridden to return the custom AccessibleObject
' for the entire chart.
Protected Overrides Function CreateAccessibilityInstance() As AccessibleObject
Return New ChartControlAccessibleObject(Me)
End Function
If you do not explicitly call the CreateAccessibilityInstance method, it will be called when the AccessibilityObject property is referenced.
Примечание
To get or set the AccessibilityObject property, you must add a reference to the Accessibility
assembly installed with the .NET Framework.
Продукт | Версии |
---|---|
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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