AccessibleObject Class
Definition
Important
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Provides information that accessibility applications use to adjust an application's user interface (UI) for users with impairments.
public ref class AccessibleObject : MarshalByRefObject, Accessibility::IAccessible, System::Reflection::IReflectpublic ref class AccessibleObject : System::Runtime::InteropServices::StandardOleMarshalObject, Accessibility::IAccessible, System::Reflection::IReflect[System.Runtime.InteropServices.ComVisible(true)]
public class AccessibleObject : MarshalByRefObject, Accessibility.IAccessible, System.Reflection.IReflect[System.Runtime.InteropServices.ComVisible(true)]
public class AccessibleObject : System.Runtime.InteropServices.StandardOleMarshalObject, Accessibility.IAccessible, System.Reflection.IReflectpublic class AccessibleObject : System.Runtime.InteropServices.StandardOleMarshalObject, Accessibility.IAccessible, System.Reflection.IReflect[<System.Runtime.InteropServices.ComVisible(true)>]
type AccessibleObject = class
inherit MarshalByRefObject
interface IReflect
interface IAccessible
interface UnsafeNativeMethods.IEnumVariant
interface UnsafeNativeMethods.IMarshal[<System.Runtime.InteropServices.ComVisible(true)>]
type AccessibleObject = class
inherit StandardOleMarshalObject
interface IReflect
interface IAccessible
interface UnsafeNativeMethods.IEnumVariant
interface UnsafeNativeMethods.IOleWindow[<System.Runtime.InteropServices.ComVisible(true)>]
type AccessibleObject = class
inherit StandardOleMarshalObject
interface IReflect
interface IAccessible[<System.Runtime.InteropServices.ComVisible(true)>]
type AccessibleObject = class
inherit StandardOleMarshalObject
interface IReflect
interface IAccessible
interface UnsafeNativeMethods.IAccessibleEx
interface UnsafeNativeMethods.IServiceProvider
interface UnsafeNativeMethods.IRawElementProviderSimple
interface UnsafeNativeMethods.IRawElementProviderFragment
interface UnsafeNativeMethods.IRawElementProviderFragmentRoot
interface UnsafeNativeMethods.IInvokeProvider
interface UnsafeNativeMethods.IValueProvider
interface UnsafeNativeMethods.IRangeValueProvider
interface UnsafeNativeMethods.IExpandCollapseProvider
interface UnsafeNativeMethods.IToggleProvider
interface UnsafeNativeMethods.ITableProvider
interface UnsafeNativeMethods.ITableItemProvider
interface UnsafeNativeMethods.IGridProvider
interface UnsafeNativeMethods.IGridItemProvider
interface UnsafeNativeMethods.IEnumVariant
interface UnsafeNativeMethods.IOleWindow
interface UnsafeNativeMethods.ILegacyIAccessibleProvider
interface UnsafeNativeMethods.ISelectionProvider
interface UnsafeNativeMethods.ISelectionItemProvider
interface UnsafeNativeMethods.IRawElementProviderHwndOverride
interface UnsafeNativeMethods.IScrollItemProvidertype AccessibleObject = class
inherit StandardOleMarshalObject
interface IReflect
interface IAccessible
interface Interop.UiaCore.IAccessibleEx
interface Interop.Ole32.IServiceProvider
interface Interop.UiaCore.IRawElementProviderSimple
interface Interop.UiaCore.IRawElementProviderFragment
interface Interop.UiaCore.IRawElementProviderFragmentRoot
interface Interop.UiaCore.IInvokeProvider
interface Interop.UiaCore.IValueProvider
interface Interop.UiaCore.IRangeValueProvider
interface Interop.UiaCore.IExpandCollapseProvider
interface Interop.UiaCore.IToggleProvider
interface Interop.UiaCore.ITableProvider
interface Interop.UiaCore.ITableItemProvider
interface Interop.UiaCore.IGridProvider
interface Interop.UiaCore.IGridItemProvider
interface Interop.Oleaut32.IEnumVariant
interface Interop.Ole32.IOleWindow
interface Interop.UiaCore.ILegacyIAccessibleProvider
interface Interop.UiaCore.ISelectionProvider
interface Interop.UiaCore.ISelectionItemProvider
interface Interop.UiaCore.IRawElementProviderHwndOverride
interface Interop.UiaCore.IScrollItemProvider
interface Interop.UiaCore.IMultipleViewProvider
interface Interop.UiaCore.ITextProvider
interface Interop.UiaCore.ITextProvider2type AccessibleObject = class
inherit StandardOleMarshalObject
interface IReflect
interface IAccessible
interface Interop.UiaCore.IAccessibleEx
interface IServiceProvider.Interface
interface Interop.UiaCore.IRawElementProviderSimple
interface Interop.UiaCore.IRawElementProviderFragment
interface Interop.UiaCore.IRawElementProviderFragmentRoot
interface Interop.UiaCore.IInvokeProvider
interface Interop.UiaCore.IValueProvider
interface Interop.UiaCore.IRangeValueProvider
interface Interop.UiaCore.IExpandCollapseProvider
interface Interop.UiaCore.IToggleProvider
interface Interop.UiaCore.ITableProvider
interface Interop.UiaCore.ITableItemProvider
interface Interop.UiaCore.IGridProvider
interface Interop.UiaCore.IGridItemProvider
interface IEnumVARIANT.Interface
interface IOleWindow.Interface
interface Interop.UiaCore.ILegacyIAccessibleProvider
interface Interop.UiaCore.ISelectionProvider
interface Interop.UiaCore.ISelectionItemProvider
interface Interop.UiaCore.IRawElementProviderHwndOverride
interface Interop.UiaCore.IScrollItemProvider
interface Interop.UiaCore.IMultipleViewProvider
interface Interop.UiaCore.ITextProvider
interface Interop.UiaCore.ITextProvider2type AccessibleObject = class
inherit StandardOleMarshalObject
interface IReflect
interface IAccessible.Interface
interface IAccessible
interface IAccessibleEx.Interface
interface IServiceProvider.Interface
interface IRawElementProviderSimple.Interface
interface IRawElementProviderFragment.Interface
interface IRawElementProviderFragmentRoot.Interface
interface IInvokeProvider.Interface
interface IValueProvider.Interface
interface IRangeValueProvider.Interface
interface IExpandCollapseProvider.Interface
interface IToggleProvider.Interface
interface ITableProvider.Interface
interface ITableItemProvider.Interface
interface IGridProvider.Interface
interface IGridItemProvider.Interface
interface IEnumVARIANT.Interface
interface IOleWindow.Interface
interface ILegacyIAccessibleProvider.Interface
interface ISelectionProvider.Interface
interface ISelectionItemProvider.Interface
interface IRawElementProviderHwndOverride.Interface
interface IScrollItemProvider.Interface
interface IMultipleViewProvider.Interface
interface ITextProvider.Interface
interface ITextProvider2.Interface
interface IDispatch.Interface
interface IDispatchEx.InterfacePublic Class AccessibleObject
Inherits MarshalByRefObject
Implements IAccessible, IReflectPublic Class AccessibleObject
Inherits StandardOleMarshalObject
Implements IAccessible, IReflect- Inheritance
- Inheritance
- Derived
- Attributes
- Implements
Examples
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. Because the chart legend is not an actual Control -based control, but instead is drawn by the chart control, it does not have 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.
#using <Accessibility.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
// Declare a chart control that demonstrates accessibility in Windows Forms.
public ref class ChartControl: public System::Windows::Forms::UserControl
{
public:
ref class ChartControlAccessibleObject;
// forward declaration
// Inner Class that represents a legend for a curve in the chart.
ref class CurveLegend
{
// Inner class CurveLegendAccessibleObject represents accessible information
// associated with the CurveLegend object.
public:
ref class CurveLegendAccessibleObject: public AccessibleObject
{
private:
CurveLegend^ curveLegend;
public:
CurveLegendAccessibleObject( CurveLegend^ curveLegend )
: AccessibleObject()
{
this->curveLegend = curveLegend;
}
private:
property ChartControlAccessibleObject^ ChartControl
{
// Private property that helps get the reference to the parent ChartControl.
ChartControlAccessibleObject^ get()
{
return dynamic_cast<ChartControlAccessibleObject^>(Parent);
}
}
internal:
property int ID
{
// Internal helper function that returns the ID for this CurveLegend.
int get()
{
for ( int i = 0; i < ChartControl->GetChildCount(); i++ )
{
if ( ChartControl->GetChild( i ) == this )
{
return i;
}
}
return -1;
}
}
public:
property Rectangle Bounds
{
// Gets the Bounds for the CurveLegend. This is used by accessibility programs.
virtual Rectangle get() override
{
// The bounds is in screen coordinates.
Point loc = curveLegend->Location;
return Rectangle(curveLegend->chart->PointToScreen( loc ),curveLegend->Size);
}
}
property String^ Name
{
// Gets or sets the Name for the CurveLegend. This is used by accessibility programs.
virtual String^ get() override
{
return curveLegend->Name;
}
virtual void set( String^ value ) override
{
curveLegend->Name = value;
}
}
property AccessibleObject^ Parent
{
// Gets the Curve Legend Parent's Accessible object.
// This is used by accessibility programs.
virtual AccessibleObject^ get() override
{
return curveLegend->chart->AccessibilityObject;
}
}
property System::Windows::Forms::AccessibleRole Role
{
// Gets the role for the CurveLegend. This is used by accessibility programs.
virtual System::Windows::Forms::AccessibleRole get() override
{
return ::AccessibleRole::StaticText;
}
}
property AccessibleStates State
{
// Gets the state based on the selection for the CurveLegend.
// This is used by accessibility programs.
virtual AccessibleStates get() override
{
AccessibleStates state = AccessibleStates::Selectable;
if ( curveLegend->Selected )
{
state = static_cast<AccessibleStates>(state | AccessibleStates::Selected);
}
return state;
}
}
// Navigates through siblings of this CurveLegend. This is used by accessibility programs.
virtual AccessibleObject^ Navigate( AccessibleNavigation navdir ) override
{
// Uses the internal NavigateFromChild helper function that exists
// on ChartControlAccessibleObject.
return ChartControl->NavigateFromChild( this, navdir );
}
// Selects or unselects this CurveLegend. This is used by accessibility programs.
virtual void Select( AccessibleSelection selection ) override
{
// Uses the internal SelectChild helper function that exists
// on ChartControlAccessibleObject.
ChartControl->SelectChild( this, selection );
}
};
private:
// class CurveLgendAccessibleObject
String^ name;
ChartControl^ chart;
CurveLegendAccessibleObject^ accObj;
bool selected;
Point location;
public:
CurveLegend( ChartControl^ chart, String^ name )
{
this->chart = chart;
this->name = name;
selected = true;
}
property AccessibleObject^ AccessibilityObject
{
// Gets the accessibility object for the curve legend.
AccessibleObject^ get()
{
if ( accObj == nullptr )
{
accObj = gcnew CurveLegendAccessibleObject( this );
}
return accObj;
}
}
property Rectangle Bounds
{
// Gets the bounds for the curve legend.
Rectangle get()
{
return Rectangle(Location,Size);
}
}
property Point Location
{
// Gets or sets the location for the curve legend.
Point get()
{
return location;
}
void set( Point value )
{
location = value;
chart->Invalidate();
// Notifies the chart of the location change. This is used for
// the accessibility information. AccessibleEvents::LocationChange
// tells the chart the reason for the notification.
chart->AccessibilityNotifyClients( AccessibleEvents::LocationChange, (dynamic_cast<CurveLegendAccessibleObject^>(AccessibilityObject))->ID );
}
}
property String^ Name
{
// Gets or sets the Name for the curve legend.
String^ get()
{
return name;
}
void set( String^ value )
{
if ( name != value )
{
name = value;
chart->Invalidate();
// Notifies the chart of the name change. This is used for
// the accessibility information. AccessibleEvents::NameChange
// tells the chart the reason for the notification.
chart->AccessibilityNotifyClients( AccessibleEvents::NameChange, (dynamic_cast<CurveLegendAccessibleObject^>(AccessibilityObject))->ID );
}
}
}
property bool Selected
{
// Gets or sets the Selected state for the curve legend.
bool get()
{
return selected;
}
void set( bool value )
{
if ( selected != value )
{
selected = value;
chart->Invalidate();
// Notifies the chart of the selection value change. This is used for
// the accessibility information. The AccessibleEvents value depends upon
// if the selection is true (AccessibleEvents::SelectionAdd) or
// false (AccessibleEvents::SelectionRemove).
chart->AccessibilityNotifyClients( selected ? AccessibleEvents::SelectionAdd : AccessibleEvents::SelectionRemove, (dynamic_cast<CurveLegendAccessibleObject^>(AccessibilityObject))->ID );
}
}
}
property System::Drawing::Size Size
{
// Gets the Size for the curve legend.
System::Drawing::Size get()
{
int legendHeight = chart->Font->Height + 4;
Graphics^ g = chart->CreateGraphics();
int legendWidth = (int)g->MeasureString( Name, chart->Font ).Width + 4;
return System::Drawing::Size( legendWidth, legendHeight );
}
}
};
private:
// class CurveLegend
CurveLegend^ legend1;
CurveLegend^ legend2;
public:
ChartControl()
{
// The ChartControl draws the chart in the OnPaint .
SetStyle( ControlStyles::ResizeRedraw, true );
SetStyle( ControlStyles::DoubleBuffer, true );
SetStyle( ControlStyles::AllPaintingInWmPaint, true );
this->BackColor = System::Drawing::Color::White;
this->Name = "ChartControl";
this->Click += gcnew System::EventHandler( this, &ChartControl::ChartControl_Click );
this->QueryAccessibilityHelp += gcnew System::Windows::Forms::QueryAccessibilityHelpEventHandler( this, &ChartControl::ChartControl_QueryAccessibilityHelp );
// The CurveLengend is not Control-based, it just
// represents the parts of the legend.
legend1 = gcnew CurveLegend( this,"A" );
legend1->Location = Point(20,30);
legend2 = gcnew CurveLegend( this,"B" );
legend2->Location = Point(20,50);
}
protected:
// Overridden to return the custom AccessibleObject
// for the entire chart.
virtual AccessibleObject^ CreateAccessibilityInstance() override
{
return gcnew ChartControlAccessibleObject( this );
}
virtual void OnPaint( PaintEventArgs^ e ) override
{
// The ChartControl draws the chart in the OnPaint .
System::Windows::Forms::UserControl::OnPaint( e );
Rectangle bounds = this->ClientRectangle;
int border = 5;
// Draws the legends first.
StringFormat^ format = gcnew StringFormat;
format->Alignment = StringAlignment::Center;
format->LineAlignment = StringAlignment::Center;
if ( legend1 != nullptr )
{
if ( legend1->Selected )
{
e->Graphics->FillRectangle( gcnew SolidBrush( Color::Blue ), legend1->Bounds );
}
else
{
e->Graphics->DrawRectangle( Pens::Blue, legend1->Bounds );
}
e->Graphics->DrawString( legend1->Name, this->Font, Brushes::Black, legend1->Bounds, format );
}
if ( legend2 != nullptr )
{
if ( legend2->Selected )
{
e->Graphics->FillRectangle( gcnew SolidBrush( Color::Red ), legend2->Bounds );
}
else
{
e->Graphics->DrawRectangle( Pens::Red, legend2->Bounds );
}
e->Graphics->DrawString( legend2->Name, this->Font, Brushes::Black, legend2->Bounds, format );
}
// Charts out the actual curves that represent data in the Chart.
bounds.Inflate( -border, -border );
array<Point>^ temp1 = {Point(bounds.Left,bounds.Bottom),Point(bounds.Left + bounds.Width / 3,bounds.Top + bounds.Height / 5),Point(bounds.Right - bounds.Width / 3,(bounds.Top + bounds.Bottom) / 2),Point(bounds.Right,bounds.Top)};
array<Point>^curve1 = temp1;
array<Point>^ temp2 = {Point(bounds.Left,bounds.Bottom - bounds.Height / 3),Point(bounds.Left + bounds.Width / 3,bounds.Top + bounds.Height / 5),Point(bounds.Right - bounds.Width / 3,(bounds.Top + bounds.Bottom) / 2),Point(bounds.Right,bounds.Top + bounds.Height / 2)};
array<Point>^curve2 = temp2;
// Draws the actual curve only if it is selected.
if ( legend1->Selected )
e->Graphics->DrawCurve( Pens::Blue, curve1 );
if ( legend2->Selected )
e->Graphics->DrawCurve( Pens::Red, curve2 );
e->Graphics->DrawRectangle( Pens::Blue, bounds );
}
// Handles the QueryAccessibilityHelp event.
void ChartControl_QueryAccessibilityHelp( Object^ /*sender*/, System::Windows::Forms::QueryAccessibilityHelpEventArgs^ e )
{
e->HelpString = "Displays chart data";
}
// Handles the Click event for the chart.
// Toggles the selection of whatever legend was clicked on
void ChartControl_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
Point pt = this->PointToClient( Control::MousePosition );
if ( legend1->Bounds.Contains( pt ) )
{
legend1->Selected = !legend1->Selected;
}
else
if ( legend2->Bounds.Contains( pt ) )
{
legend2->Selected = !legend2->Selected;
}
}
public:
property array<CurveLegend^>^ Legends
{
// Gets an array of CurveLengends used in the Chart.
array<CurveLegend^>^ get()
{
array<CurveLegend^>^temp3 = {legend1,legend2};
return temp3;
}
}
// Inner class ChartControlAccessibleObject represents accessible information associated with the ChartControl.
// The ChartControlAccessibleObject is returned in the ChartControl::CreateAccessibilityInstance .
ref class ChartControlAccessibleObject: public ControlAccessibleObject
{
private:
ChartControl^ chartControl;
public:
ChartControlAccessibleObject( ChartControl^ ctrl )
: ControlAccessibleObject( ctrl )
{
chartControl = ctrl;
}
property System::Windows::Forms::AccessibleRole Role
{
// Gets the role for the Chart. This is used by accessibility programs.
virtual System::Windows::Forms::AccessibleRole get() override
{
return ::AccessibleRole::Chart;
}
}
property AccessibleStates State
{
// Gets the state for the Chart. This is used by accessibility programs.
virtual AccessibleStates get() override
{
return AccessibleStates::ReadOnly;
}
}
// The CurveLegend objects are "child" controls in terms of accessibility so
// return the number of ChartLengend objects.
virtual int GetChildCount() override
{
return chartControl->Legends->Length;
}
// Gets the Accessibility object of the child CurveLegend idetified by index.
virtual AccessibleObject^ GetChild( int index ) override
{
if ( index >= 0 && index < chartControl->Legends->Length )
{
return chartControl->Legends[ index ]->AccessibilityObject;
}
return nullptr;
}
internal:
// Helper function that is used by the CurveLegend's accessibility object
// to navigate between sibiling controls. Specifically, this function is used in
// the CurveLegend::CurveLegendAccessibleObject.Navigate function.
AccessibleObject^ NavigateFromChild( CurveLegend::CurveLegendAccessibleObject^ child, AccessibleNavigation navdir )
{
switch ( navdir )
{
case AccessibleNavigation::Down:
case AccessibleNavigation::Next:
return GetChild( child->ID + 1 );
case AccessibleNavigation::Up:
case AccessibleNavigation::Previous:
return GetChild( child->ID - 1 );
}
return nullptr;
}
// Helper function that is used by the CurveLegend's accessibility object
// to select a specific CurveLegend control. Specifically, this function is used
// in the CurveLegend::CurveLegendAccessibleObject.Select function.
void SelectChild( CurveLegend::CurveLegendAccessibleObject^ child, AccessibleSelection selection )
{
int childID = child->ID;
// Determine which selection action should occur, based on the
// AccessibleSelection value.
if ( (selection & AccessibleSelection::TakeSelection) != (AccessibleSelection)0 )
{
for ( int i = 0; i < chartControl->Legends->Length; i++ )
{
if ( i == childID )
{
chartControl->Legends[ i ]->Selected = true;
}
else
{
chartControl->Legends[ i ]->Selected = false;
}
}
// AccessibleSelection->AddSelection means that the CurveLegend will be selected.
if ( (selection & AccessibleSelection::AddSelection) != (AccessibleSelection)0 )
{
chartControl->Legends[ childID ]->Selected = true;
}
// AccessibleSelection->AddSelection means that the CurveLegend will be unselected.
if ( (selection & AccessibleSelection::RemoveSelection) != (AccessibleSelection)0 )
{
chartControl->Legends[ childID ]->Selected = false;
}
}
}
};
// class ChartControlAccessibleObject
};
// class ChartControl
public ref class Form1: public System::Windows::Forms::Form
{
private:
// Test out the Chart Control.
ChartControl^ chart1;
public:
Form1()
{
// Create a chart control and add it to the form.
this->chart1 = gcnew ChartControl;
this->ClientSize = System::Drawing::Size( 920, 566 );
this->chart1->Location = System::Drawing::Point( 47, 16 );
this->chart1->Size = System::Drawing::Size( 600, 400 );
this->Controls->Add( this->chart1 );
}
};
// class Form1
[STAThread]
int main()
{
Application::Run( gcnew Form1 );
}
using System;
using System.Drawing;
using System.Windows.Forms;
namespace ChartControl
{
public class Form1 : System.Windows.Forms.Form
{
// Test out the Chart Control.
private ChartControl chart1;
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
public Form1() {
// Create a chart control and add it to the form.
this.chart1 = new ChartControl();
this.ClientSize = new System.Drawing.Size(920, 566);
this.chart1.Location = new System.Drawing.Point(47, 16);
this.chart1.Size = new System.Drawing.Size(600, 400);
this.Controls.Add(this.chart1);
}
}
// Declare a chart control that demonstrates accessibility in Windows Forms.
public class ChartControl : System.Windows.Forms.UserControl
{
private CurveLegend legend1;
private CurveLegend legend2;
public ChartControl()
{
// The ChartControl draws the chart in the OnPaint override.
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.BackColor = System.Drawing.Color.White;
this.Name = "ChartControl";
this.Click += new System.EventHandler(this.ChartControl_Click);
this.QueryAccessibilityHelp +=
new System.Windows.Forms.QueryAccessibilityHelpEventHandler(
this.ChartControl_QueryAccessibilityHelp);
// The CurveLengend is not Control-based, it just
// represents the parts of the legend.
legend1 = new CurveLegend(this, "A");
legend1.Location = new Point(20, 30);
legend2 = new CurveLegend(this, "B");
legend2.Location = new Point(20, 50);
}
// Overridden to return the custom AccessibleObject
// for the entire chart.
protected override AccessibleObject CreateAccessibilityInstance()
{
return new ChartControlAccessibleObject(this);
}
protected override void OnPaint(PaintEventArgs e)
{
// The ChartControl draws the chart in the OnPaint override.
base.OnPaint(e);
Rectangle bounds = this.ClientRectangle;
int border = 5;
// Draws the legends first.
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
if (legend1 != null) {
if (legend1.Selected) {
e.Graphics.FillRectangle(new SolidBrush(Color.Blue), legend1.Bounds);
} else {
e.Graphics.DrawRectangle(Pens.Blue, legend1.Bounds);
}
e.Graphics.DrawString(legend1.Name, this.Font, Brushes.Black, legend1.Bounds, format);
}
if (legend2 != null) {
if (legend2.Selected) {
e.Graphics.FillRectangle(new SolidBrush(Color.Red), legend2.Bounds);
} else {
e.Graphics.DrawRectangle(Pens.Red, legend2.Bounds);
}
e.Graphics.DrawString(legend2.Name, this.Font, Brushes.Black, legend2.Bounds, format);
}
// Charts out the actual curves that represent data in the Chart.
bounds.Inflate(-border, -border);
Point[] curve1 = new Point[] {new Point(bounds.Left, bounds.Bottom),
new Point(bounds.Left + bounds.Width / 3, bounds.Top + bounds.Height / 5),
new Point(bounds.Right - bounds.Width / 3, (bounds.Top + bounds.Bottom) / 2),
new Point(bounds.Right, bounds.Top)};
Point[] curve2 = new Point[] {new Point(bounds.Left, bounds.Bottom - bounds.Height / 3),
new Point(bounds.Left + bounds.Width / 3, bounds.Top + bounds.Height / 5),
new Point(bounds.Right - bounds.Width / 3, (bounds.Top + bounds.Bottom) / 2),
new Point(bounds.Right, bounds.Top + bounds.Height / 2)};
// Draws the actual curve only if it is selected.
if (legend1.Selected) e.Graphics.DrawCurve(Pens.Blue, curve1);
if (legend2.Selected) e.Graphics.DrawCurve(Pens.Red, curve2);
e.Graphics.DrawRectangle(Pens.Blue, bounds);
}
// Handles the QueryAccessibilityHelp event.
private void ChartControl_QueryAccessibilityHelp(object sender,
System.Windows.Forms.QueryAccessibilityHelpEventArgs e)
{
e.HelpString = "Displays chart data";
}
// Handles the Click event for the chart.
// Toggles the selection of whatever legend was clicked on
private void ChartControl_Click(object sender, System.EventArgs e)
{
Point pt = this.PointToClient(Control.MousePosition);
if (legend1.Bounds.Contains(pt)) {
legend1.Selected = !legend1.Selected;
} else if (legend2.Bounds.Contains(pt)) {
legend2.Selected = !legend2.Selected;
}
}
// Gets an array of CurveLengends used in the Chart.
public CurveLegend[] Legends
{
get {
return new CurveLegend[] { legend1, legend2 };
}
}
// Inner class ChartControlAccessibleObject represents accessible information associated with the ChartControl.
// The ChartControlAccessibleObject is returned in the ChartControl.CreateAccessibilityInstance override.
public class ChartControlAccessibleObject : ControlAccessibleObject
{
ChartControl chartControl;
public ChartControlAccessibleObject(ChartControl ctrl) : base(ctrl)
{
chartControl = ctrl;
}
// Gets the role for the Chart. This is used by accessibility programs.
public override AccessibleRole Role
{
get {
return AccessibleRole.Chart;
}
}
// Gets the state for the Chart. This is used by accessibility programs.
public override AccessibleStates State
{
get {
return AccessibleStates.ReadOnly;
}
}
// The CurveLegend objects are "child" controls in terms of accessibility so
// return the number of ChartLengend objects.
public override int GetChildCount()
{
return chartControl.Legends.Length;
}
// Gets the Accessibility object of the child CurveLegend idetified by index.
public override AccessibleObject GetChild(int index)
{
if (index >= 0 && index < chartControl.Legends.Length) {
return chartControl.Legends[index].AccessibilityObject;
}
return null;
}
// Helper function that is used by the CurveLegend's accessibility object
// to navigate between sibiling controls. Specifically, this function is used in
// the CurveLegend.CurveLegendAccessibleObject.Navigate function.
internal AccessibleObject NavigateFromChild(CurveLegend.CurveLegendAccessibleObject child,
AccessibleNavigation navdir)
{
switch(navdir) {
case AccessibleNavigation.Down:
case AccessibleNavigation.Next:
return GetChild(child.ID + 1);
case AccessibleNavigation.Up:
case AccessibleNavigation.Previous:
return GetChild(child.ID - 1);
}
return null;
}
// Helper function that is used by the CurveLegend's accessibility object
// to select a specific CurveLegend control. Specifically, this function is used
// in the CurveLegend.CurveLegendAccessibleObject.Select function.
internal void SelectChild(CurveLegend.CurveLegendAccessibleObject child, AccessibleSelection selection)
{
int childID = child.ID;
// Determine which selection action should occur, based on the
// AccessibleSelection value.
if ((selection & AccessibleSelection.TakeSelection) != 0) {
for(int i = 0; i < chartControl.Legends.Length; i++) {
if (i == childID) {
chartControl.Legends[i].Selected = true;
} else {
chartControl.Legends[i].Selected = false;
}
}
// AccessibleSelection.AddSelection means that the CurveLegend will be selected.
if ((selection & AccessibleSelection.AddSelection) != 0) {
chartControl.Legends[childID].Selected = true;
}
// AccessibleSelection.AddSelection means that the CurveLegend will be unselected.
if ((selection & AccessibleSelection.RemoveSelection) != 0) {
chartControl.Legends[childID].Selected = false;
}
}
}
}
// Inner Class that represents a legend for a curve in the chart.
public class CurveLegend
{
private string name;
private ChartControl chart;
private CurveLegendAccessibleObject accObj;
private bool selected = true;
private Point location;
public CurveLegend(ChartControl chart, string name)
{
this.chart = chart;
this.name = name;
}
// Gets the accessibility object for the curve legend.
public AccessibleObject AccessibilityObject
{
get
{
accObj ??= new CurveLegendAccessibleObject(this);
return accObj;
}
}
// Gets the bounds for the curve legend.
public Rectangle Bounds
{
get
{
return new Rectangle(Location, Size);
}
}
// Gets or sets the location for the curve legend.
public Point Location
{
get {
return location;
}
set {
location = value;
chart.Invalidate();
// Notifies the chart of the location change. This is used for
// the accessibility information. AccessibleEvents.LocationChange
// tells the chart the reason for the notification.
chart.AccessibilityNotifyClients(AccessibleEvents.LocationChange,
((CurveLegendAccessibleObject)AccessibilityObject).ID);
}
}
// Gets or sets the Name for the curve legend.
public string Name
{
get {
return name;
}
set {
if (name != value)
{
name = value;
chart.Invalidate();
// Notifies the chart of the name change. This is used for
// the accessibility information. AccessibleEvents.NameChange
// tells the chart the reason for the notification.
chart.AccessibilityNotifyClients(AccessibleEvents.NameChange,
((CurveLegendAccessibleObject)AccessibilityObject).ID);
}
}
}
// Gets or sets the Selected state for the curve legend.
public bool Selected
{
get {
return selected;
}
set {
if (selected != value)
{
selected = value;
chart.Invalidate();
// Notifies the chart of the selection value change. This is used for
// the accessibility information. The AccessibleEvents value depends upon
// if the selection is true (AccessibleEvents.SelectionAdd) or
// false (AccessibleEvents.SelectionRemove).
chart.AccessibilityNotifyClients(
selected ? AccessibleEvents.SelectionAdd : AccessibleEvents.SelectionRemove,
((CurveLegendAccessibleObject)AccessibilityObject).ID);
}
}
}
// Gets the Size for the curve legend.
public Size Size
{
get {
int legendHeight = chart.Font.Height + 4;
Graphics g = chart.CreateGraphics();
int legendWidth = (int)g.MeasureString(Name, chart.Font).Width + 4;
return new Size(legendWidth, legendHeight);
}
}
// Inner class CurveLegendAccessibleObject represents accessible information
// associated with the CurveLegend object.
public class CurveLegendAccessibleObject : AccessibleObject
{
private CurveLegend curveLegend;
public CurveLegendAccessibleObject(CurveLegend curveLegend) : base()
{
this.curveLegend = curveLegend;
}
// Private property that helps get the reference to the parent ChartControl.
private ChartControlAccessibleObject ChartControl
{
get {
return Parent as ChartControlAccessibleObject;
}
}
// Internal helper function that returns the ID for this CurveLegend.
internal int ID
{
get {
for(int i = 0; i < ChartControl.GetChildCount(); i++) {
if (ChartControl.GetChild(i) == this) {
return i;
}
}
return -1;
}
}
// Gets the Bounds for the CurveLegend. This is used by accessibility programs.
public override Rectangle Bounds
{
get {
// The bounds is in screen coordinates.
Point loc = curveLegend.Location;
return new Rectangle(curveLegend.chart.PointToScreen(loc), curveLegend.Size);
}
}
// Gets or sets the Name for the CurveLegend. This is used by accessibility programs.
public override string Name
{
get {
return curveLegend.Name;
}
set {
curveLegend.Name = value;
}
}
// Gets the Curve Legend Parent's Accessible object.
// This is used by accessibility programs.
public override AccessibleObject Parent
{
get {
return curveLegend.chart.AccessibilityObject;
}
}
// Gets the role for the CurveLegend. This is used by accessibility programs.
public override AccessibleRole Role
{
get {
return AccessibleRole.StaticText;
}
}
// Gets the state based on the selection for the CurveLegend.
// This is used by accessibility programs.
public override AccessibleStates State
{
get {
AccessibleStates state = AccessibleStates.Selectable;
if (curveLegend.Selected)
{
state |= AccessibleStates.Selected;
}
return state;
}
}
// Navigates through siblings of this CurveLegend. This is used by accessibility programs.
public override AccessibleObject Navigate(AccessibleNavigation navdir)
{
// Uses the internal NavigateFromChild helper function that exists
// on ChartControlAccessibleObject.
return ChartControl.NavigateFromChild(this, navdir);
}
// Selects or unselects this CurveLegend. This is used by accessibility programs.
public override void Select(AccessibleSelection selection)
{
// Uses the internal SelectChild helper function that exists
// on ChartControlAccessibleObject.
ChartControl.SelectChild(this, selection);
}
}
}
}
}
Option Explicit
Imports System.Drawing
Imports System.Windows.Forms
Namespace ChartControlNameSpace
Public Class Form1
Inherits System.Windows.Forms.Form
' Test out the Chart Control.
Private chart1 As ChartControl
<System.STAThread()> _
Public Shared Sub Main()
System.Windows.Forms.Application.Run(New Form1())
End Sub
Public Sub New()
' Create a chart control and add it to the form.
Me.chart1 = New ChartControl()
Me.ClientSize = New System.Drawing.Size(920, 566)
Me.chart1.Location = New System.Drawing.Point(47, 16)
Me.chart1.Size = New System.Drawing.Size(600, 400)
Me.Controls.Add(Me.chart1)
End Sub
End Class
' Declares a chart control that demonstrates Accessibility in Windows Forms.
Public Class ChartControl
Inherits System.Windows.Forms.UserControl
Private legend1 As CurveLegend
Private legend2 As CurveLegend
Public Sub New()
' The ChartControl draws the chart in the OnPaint override.
SetStyle(ControlStyles.ResizeRedraw, True)
SetStyle(ControlStyles.DoubleBuffer, True)
SetStyle(ControlStyles.AllPaintingInWmPaint, True)
Me.BackColor = System.Drawing.Color.White
Me.Name = "ChartControl"
' The CurveLengend is not Control-based, it just
' represent the parts of the legend.
legend1 = New CurveLegend(Me, "A")
legend1.Location = New Point(20, 30)
legend2 = New CurveLegend(Me, "B")
legend2.Location = New Point(20, 50)
End Sub
' Overridden to return the custom AccessibleObject
' for the entire chart.
Protected Overrides Function CreateAccessibilityInstance() As AccessibleObject
Return New ChartControlAccessibleObject(Me)
End Function
Protected Overrides Sub OnPaint(e As PaintEventArgs)
' The ChartControl draws the chart in the OnPaint override.
MyBase.OnPaint(e)
Dim bounds As Rectangle = Me.ClientRectangle
Dim border As Integer = 5
' Draw the legends first.
Dim format As New StringFormat()
format.Alignment = StringAlignment.Center
format.LineAlignment = StringAlignment.Center
If (legend1 IsNot Nothing) Then
If legend1.Selected Then
e.Graphics.FillRectangle(New SolidBrush(Color.Blue), legend1.Bounds)
Else
e.Graphics.DrawRectangle(Pens.Blue, legend1.Bounds)
End If
e.Graphics.DrawString(legend1.Name, Me.Font, Brushes.Black, RectangleF.op_Implicit(legend1.Bounds), format)
End If
If (legend2 IsNot Nothing) Then
If legend2.Selected Then
e.Graphics.FillRectangle(New SolidBrush(Color.Red), legend2.Bounds)
Else
e.Graphics.DrawRectangle(Pens.Red, legend2.Bounds)
End If
e.Graphics.DrawString(legend2.Name, Me.Font, Brushes.Black, RectangleF.op_Implicit(legend2.Bounds), format)
End If
' Chart out the actual curves that represent data in the Chart.
bounds.Inflate(-border, -border)
Dim curve1() As Point = {New Point(bounds.Left, bounds.Bottom), _
New Point(bounds.Left + bounds.Width / 3, bounds.Top + bounds.Height / 5), _
New Point(bounds.Right - bounds.Width / 3,(bounds.Top + bounds.Bottom) / 2), _
New Point(bounds.Right, bounds.Top)}
Dim curve2() As Point = {New Point(bounds.Left, bounds.Bottom - bounds.Height / 3), _
New Point(bounds.Left + bounds.Width / 3, bounds.Top + bounds.Height / 5), _
New Point(bounds.Right - bounds.Width / 3,(bounds.Top + bounds.Bottom) / 2), _
New Point(bounds.Right, bounds.Top + bounds.Height / 2)}
' Draw the actual curve only if it is selected.
If legend1.Selected Then
e.Graphics.DrawCurve(Pens.Blue, curve1)
End If
If legend2.Selected Then
e.Graphics.DrawCurve(Pens.Red, curve2)
End If
e.Graphics.DrawRectangle(Pens.Blue, bounds)
End Sub
' Handle the QueryAccessibilityHelp event.
Private Sub ChartControl_QueryAccessibilityHelp(sender As Object, _
e As System.Windows.Forms.QueryAccessibilityHelpEventArgs) Handles MyBase.QueryAccessibilityHelp
e.HelpString = "Displays chart data"
End Sub
' Handle the Click event for the chart.
' Toggle the selection of whatever legend was clicked.
Private Sub ChartControl_Click(sender As Object, e As System.EventArgs) Handles MyBase.Click
Dim pt As Point = Me.PointToClient(Control.MousePosition)
If legend1.Bounds.Contains(pt) Then
legend1.Selected = Not legend1.Selected
Else
If legend2.Bounds.Contains(pt) Then
legend2.Selected = Not legend2.Selected
End If
End If
End Sub
' Get an array of the CurveLengends used in the Chart.
Public ReadOnly Property Legends() As CurveLegend()
Get
Return New CurveLegend() {legend1, legend2}
End Get
End Property
Protected Sub ExposeAccessibilityNotifyClients(ByVal accEvent As AccessibleEvents, ByVal childID As Integer)
AccessibilityNotifyClients(accEvent, childID)
End Sub
' Inner Class ChartControlAccessibleObject represents accessible information
' associated with the ChartControl.
' The ChartControlAccessibleObject is returned in the ' ChartControl.CreateAccessibilityInstance override.
Public Class ChartControlAccessibleObject
Inherits Control.ControlAccessibleObject
Private chartControl As ChartControl
Public Sub New(ctrl As ChartControl)
MyBase.New(ctrl)
chartControl = ctrl
End Sub
' Get the role for the Chart. This is used by accessibility programs.
Public Overrides ReadOnly Property Role() As AccessibleRole
Get
Return System.Windows.Forms.AccessibleRole.Chart
End Get
End Property
' Get the state for the Chart. This is used by accessibility programs.
Public Overrides ReadOnly Property State() As AccessibleStates
Get
Return AccessibleStates.ReadOnly
End Get
End Property
' The CurveLegend objects are "child" controls in terms of accessibility so
' return the number of ChartLengend objects.
Public Overrides Function GetChildCount() As Integer
Return chartControl.Legends.Length
End Function
' Get the Accessibility object of the child CurveLegend idetified by index.
Public Overrides Function GetChild(index As Integer) As AccessibleObject
If index >= 0 And index < chartControl.Legends.Length Then
Return chartControl.Legends(index).AccessibilityObject
End If
Return Nothing
End Function
' Helper function that is used by the CurveLegend's accessibility object
' to navigate between sibiling controls. Specifically, this function is used in
' the CurveLegend.CurveLegendAccessibleObject.Navigate function.
Friend Function NavigateFromChild(child As CurveLegend.CurveLegendAccessibleObject, _
navdir As AccessibleNavigation) As AccessibleObject
Select Case navdir
Case AccessibleNavigation.Down, AccessibleNavigation.Next
Return GetChild(child.ID + 1)
Case AccessibleNavigation.Up, AccessibleNavigation.Previous
Return GetChild(child.ID - 1)
End Select
Return Nothing
End Function
' Helper function that is used by the CurveLegend's accessibility object
' to select a specific CurveLegend control. Specifically, this function is used
' in the CurveLegend.CurveLegendAccessibleObject.Select function.
Friend Sub SelectChild(child As CurveLegend.CurveLegendAccessibleObject, selection As AccessibleSelection)
Dim childID As Integer = child.ID
' Determine which selection action should occur, based on the
' AccessibleSelection value.
If (selection And AccessibleSelection.TakeSelection) <> 0 Then
Dim i As Integer
For i = 0 To chartControl.Legends.Length - 1
If i = childID Then
chartControl.Legends(i).Selected = True
Else
chartControl.Legends(i).Selected = False
End If
Next i
' AccessibleSelection.AddSelection means that the CurveLegend will be selected.
If (selection And AccessibleSelection.AddSelection) <> 0 Then
chartControl.Legends(childID).Selected = True
End If
' AccessibleSelection.AddSelection means that the CurveLegend will be unselected.
If (selection And AccessibleSelection.RemoveSelection) <> 0 Then
chartControl.Legends(childID).Selected = False
End If
End If
End Sub
End Class
' Inner Class that represents a legend for a curve in the chart.
Public Class CurveLegend
Private m_name As String
Private chart As ChartControl
Private accObj As CurveLegendAccessibleObject
Private m_selected As Boolean = True
Private m_location As Point
Public Sub New(chart As ChartControl, name As String)
Me.chart = chart
Me.m_name = name
End Sub
' Gets the accessibility object for the curve legend.
Public ReadOnly Property AccessibilityObject() As AccessibleObject
Get
If accObj Is Nothing Then
accObj = New CurveLegendAccessibleObject(Me)
End If
Return accObj
End Get
End Property
' Gets the bounds for the curve legend.
Public ReadOnly Property Bounds() As Rectangle
Get
Return New Rectangle(Location, Size)
End Get
End Property
' Gets or sets the location for the curve legend.
Public Property Location() As Point
Get
Return m_location
End Get
Set
m_location = value
chart.Invalidate()
' Notifies the chart of the location change. This is used for
' the accessibility information. AccessibleEvents.LocationChange
' tells the chart the reason for the notification.
chart.ExposeAccessibilityNotifyClients(AccessibleEvents.LocationChange, _
CType(AccessibilityObject, CurveLegendAccessibleObject).ID)
End Set
End Property
' Gets or sets the Name for the curve legend.
Public Property Name() As String
Get
Return m_name
End Get
Set
If m_name <> value Then
m_name = value
chart.Invalidate()
' Notifies the chart of the name change. This is used for
' the accessibility information. AccessibleEvents.NameChange
' tells the chart the reason for the notification.
chart.ExposeAccessibilityNotifyClients(AccessibleEvents.NameChange, _
CType(AccessibilityObject, CurveLegendAccessibleObject).ID)
End If
End Set
End Property
' Gets or sets the Selected state for the curve legend.
Public Property Selected() As Boolean
Get
Return m_selected
End Get
Set
If m_selected <> value Then
m_selected = value
chart.Invalidate()
' Notifies the chart of the selection value change. This is used for
' the accessibility information. The AccessibleEvents value varies
' on whether the selection is true (AccessibleEvents.SelectionAdd) or
' false (AccessibleEvents.SelectionRemove).
If m_selected Then
chart.ExposeAccessibilityNotifyClients(AccessibleEvents.SelectionAdd, _
CType(AccessibilityObject, CurveLegendAccessibleObject).ID)
Else
chart.ExposeAccessibilityNotifyClients(AccessibleEvents.SelectionRemove, _
CType(AccessibilityObject, CurveLegendAccessibleObject).ID)
End If
End If
End Set
End Property
' Gets the Size for the curve legend.
Public ReadOnly Property Size() As Size
Get
Dim legendHeight As Integer = chart.Font.Height + 4
Dim g As Graphics = chart.CreateGraphics()
Dim legendWidth As Integer = CInt(g.MeasureString(Name, chart.Font).Width) + 4
Return New Size(legendWidth, legendHeight)
End Get
End Property
' Inner class CurveLegendAccessibleObject represents accessible information
' associated with the CurveLegend object.
Public Class CurveLegendAccessibleObject
Inherits AccessibleObject
Private curveLegend As CurveLegend
Public Sub New(curveLegend As CurveLegend)
Me.curveLegend = curveLegend
End Sub
' Private property that helps get the reference to the parent ChartControl.
Private ReadOnly Property ChartControl() As ChartControlAccessibleObject
Get
Return CType(Parent, ChartControlAccessibleObject)
End Get
End Property
' Friend helper function that returns the ID for this CurveLegend.
Friend ReadOnly Property ID() As Integer
Get
Dim i As Integer
For i = 0 To (ChartControl.GetChildCount()) - 1
If ChartControl.GetChild(i) Is Me Then
Return i
End If
Next i
Return - 1
End Get
End Property
' Gets the Bounds for the CurveLegend. This is used by accessibility programs.
Public Overrides ReadOnly Property Bounds() As Rectangle
Get
' The bounds is in screen coordinates.
Dim loc As Point = curveLegend.Location
Return New Rectangle(curveLegend.chart.PointToScreen(loc), curveLegend.Size)
End Get
End Property
' Gets or sets the Name for the CurveLegend. This is used by accessibility programs.
Public Overrides Property Name() As String
Get
Return curveLegend.Name
End Get
Set
curveLegend.Name = value
End Set
End Property
' Gets the Curve Legend Parent's Accessible object.
' This is used by accessibility programs.
Public Overrides ReadOnly Property Parent() As AccessibleObject
Get
Return curveLegend.chart.AccessibilityObject
End Get
End Property
' Gets the role for the CurveLegend. This is used by accessibility programs.
Public Overrides ReadOnly Property Role() As AccessibleRole
Get
Return System.Windows.Forms.AccessibleRole.StaticText
End Get
End Property
' Gets the state based on the selection for the CurveLegend.
' This is used by accessibility programs.
Public Overrides ReadOnly Property State() As AccessibleStates
Get
Dim stateTemp As AccessibleStates = AccessibleStates.Selectable
If curveLegend.Selected Then
stateTemp = stateTemp Or AccessibleStates.Selected
End If
Return stateTemp
End Get
End Property
' Navigates through siblings of this CurveLegend. This is used by accessibility programs.
Public Overrides Function Navigate(navdir As AccessibleNavigation) As AccessibleObject
' Use the Friend NavigateFromChild helper function that exists
' on ChartControlAccessibleObject.
Return ChartControl.NavigateFromChild(Me, navdir)
End Function
' Selects or unselects this CurveLegend. This is used by accessibility programs.
Public Overrides Sub [Select](selection As AccessibleSelection)
' Use the internal SelectChild helper function that exists
' on ChartControlAccessibleObject.
ChartControl.SelectChild(Me, selection)
End Sub
End Class
End Class
End Class
End Namespace 'ChartControlNameSpace
Remarks
Accessibility applications can adjust features of the application to improve usability for users with disabilities.
For users who are visually impaired, you can adjust software and operating system features to comply with their needs. For example, you can enlarge text and images and render them with a contrast. In addition, you can accommodate color-blindness with the appropriate use of colors. For users who are severely visually impaired, computers are accessible with screen review aids that translate on-screen text to speech or to a dynamic, refreshable, Braille display.
For users who are hard of hearing, you can design programs that use visual cues, such as a flashing toolbar; or you can display spoken messages as text. For example, when turned on, the SoundSentry feature, an accessibility option in Control Panel, provides a visual warning whenever the system makes an alarm sound.
For users with motion disabilities, you can design controls that refine or eliminate keyboard and mouse use, thereby improving computer accessibility. Control Panel offers assistance. For example, one alternative is to use the numeric keypad instead of the mouse for navigation. Another option, called StickyKeys, enables users who cannot hold down two or more keys at a time (such as CTRL+P) to get the same result by typing one key at a time.
For users with cognitive and language disabilities, you can design software programs to better accommodate their needs. For example, using conspicuous or cued sequencing, uncomplicated displays, fewer words, and a reading level targeted to elementary school standards can benefit these users.
For users with seizure disorders, you can design software programs to eliminate seizure provoking patterns.
For more information about accessibility, including information about accessibility applications, see Windows Accessibility features.
Note
To use the AccessibleObject, you must add a reference to the Accessibility assembly installed with the .NET Framework. Windows Forms only supports Active Accessibility 2.0.
Notes to Inheritors
When you inherit from this class, you can override all the members.
Constructors
| AccessibleObject() |
Initializes a new instance of the AccessibleObject class. |
Properties
| Bounds |
Gets the location and size of the accessible object. |
| DefaultAction |
Gets a string that describes the default action of the object. Not all objects have a default action. |
| Description |
Gets a string that describes the visual appearance of the specified object. Not all objects have a description. |
| Help |
Gets a description of what the object does or how the object is used. |
| KeyboardShortcut |
Gets the shortcut key or access key for the accessible object. |
| Name |
Gets or sets the object name. |
| Parent |
Gets the parent of an accessible object. |
| Role |
Gets the role of this accessible object. |
| State |
Gets the state of this accessible object. |
| Value |
Gets or sets the value of an accessible object. |
Methods
| CreateObjRef(Type) |
Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject) |
| DoDefaultAction() |
Performs the default action associated with this accessible object. |
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetChild(Int32) |
Retrieves the accessible child corresponding to the specified index. |
| GetChildCount() |
Retrieves the number of children belonging to an accessible object. |
| GetFocused() |
Retrieves the object that has the keyboard focus. |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetHelpTopic(String) |
Gets an identifier for a Help topic identifier and the path to the Help file associated with this accessible object. |
| GetLifetimeService() |
Obsolete.
Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject) |
| GetSelected() |
Retrieves the currently selected child. |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| HitTest(Int32, Int32) |
Retrieves the child object at the specified screen coordinates. |
| InitializeLifetimeService() |
Obsolete.
Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject) |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| MemberwiseClone(Boolean) |
Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject) |
| Navigate(AccessibleNavigation) |
Navigates to another accessible object. |
| RaiseAutomationNotification(AutomationNotificationKind, AutomationNotificationProcessing, String) |
Raises the UI automation notification event. |
| RaiseLiveRegionChanged() |
Raises the LiveRegionChanged UI automation event. |
| Select(AccessibleSelection) |
Modifies the selection or moves the keyboard focus of the accessible object. |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
| UseStdAccessibleObjects(IntPtr, Int32) |
Associates an object with an instance of an AccessibleObject based on the handle and the object id of the object. |
| UseStdAccessibleObjects(IntPtr) |
Associates an object with an instance of an AccessibleObject based on the handle of the object. |
Explicit Interface Implementations
| IAccessible.accChildCount |
Gets the number of child interfaces that belong to this object. For a description of this member, see accChildCount. |
| IAccessible.accDoDefaultAction(Object) |
Performs the specified object's default action. Not all objects have a default action. For a description of this member, see accDoDefaultAction(Object). |
| IAccessible.accFocus |
Gets the object that has the keyboard focus. For a description of this member, see accFocus. |
| IAccessible.accHitTest(Int32, Int32) |
Gets the child object at the specified screen coordinates. For a description of this member, see accHitTest(Int32, Int32). |
| IAccessible.accLocation(Int32, Int32, Int32, Int32, Object) |
Gets the object's current screen location. For a description of this member, see accLocation(Int32, Int32, Int32, Int32, Object). |
| IAccessible.accNavigate(Int32, Object) |
Navigates to an accessible object relative to the current object. For a description of this member, see accNavigate(Int32, Object). |
| IAccessible.accParent |
Gets the parent accessible object of this object. For a description of this member, see accParent. |
| IAccessible.accSelect(Int32, Object) |
Modifies the selection or moves the keyboard focus of the accessible object. For a description of this member, see accSelect(Int32, Object). |
| IAccessible.accSelection |
Gets the selected child objects of an accessible object. For a description of this member, see accSelection. |
| IReflect.GetField(String, BindingFlags) |
Gets the FieldInfo object corresponding to the specified field and binding flag. For a description of this member, see GetField(String, BindingFlags). |
| IReflect.GetFields(BindingFlags) |
Gets an array of FieldInfo objects corresponding to all fields of the current class. For a description of this member, see GetFields(BindingFlags). |
| IReflect.GetMember(String, BindingFlags) |
Gets an array of MemberInfo objects corresponding to all public members or to all members that match a specified name. For a description of this member, see GetMember(String, BindingFlags). |
| IReflect.GetMembers(BindingFlags) |
Gets an array of MemberInfo objects corresponding either to all public members or to all members of the current class. For a description of this member, see GetMembers(BindingFlags). |
| IReflect.GetMethod(String, BindingFlags, Binder, Type[], ParameterModifier[]) |
Gets a MethodInfo object corresponding to a specified method, using a Type array to choose from among overloaded methods. For a description of this member, see GetMethod(String, BindingFlags, Binder, Type[], ParameterModifier[]). |
| IReflect.GetMethod(String, BindingFlags) |
Gets a MethodInfo object corresponding to a specified method under specified search constraints. For a description of this member, see GetMethod(String, BindingFlags). |
| IReflect.GetMethods(BindingFlags) |
Gets an array of MethodInfo objects with all public methods or all methods of the current class. For a description of this member, see GetMethods(BindingFlags). |
| IReflect.GetProperties(BindingFlags) |
Gets an array of PropertyInfo objects corresponding to all public properties or to all properties of the current class. For a description of this member, see GetProperties(BindingFlags). |
| IReflect.GetProperty(String, BindingFlags, Binder, Type, Type[], ParameterModifier[]) |
Gets a PropertyInfo object corresponding to a specified property with specified search constraints. For a description of this member, see GetProperty(String, BindingFlags, Binder, Type, Type[], ParameterModifier[]). |
| IReflect.GetProperty(String, BindingFlags) |
Gets a PropertyInfo object corresponding to a specified property under specified search constraints. For a description of this member, see GetProperty(String, BindingFlags). |
| IReflect.InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[]) |
Invokes a specified member. For a description of this member, see InvokeMember(String, BindingFlags, Binder, Object, Object[], ParameterModifier[], CultureInfo, String[]). |
| IReflect.UnderlyingSystemType |
Gets the underlying type that represents the IReflect object. For a description of this member, see UnderlyingSystemType. |
Applies to
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