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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Drawing;
using Windows.Win32.System.Variant;
using Windows.Win32.UI.Accessibility;
namespace System.Windows.Forms;
public partial class LinkLabel
{
internal sealed class LinkLabelAccessibleObject : LabelAccessibleObject
{
private int[]? _runtimeId;
public LinkLabelAccessibleObject(LinkLabel owner) : base(owner)
{
}
internal override IRawElementProviderFragment.Interface? ElementProviderFromPoint(double x, double y)
=> !this.IsOwnerHandleCreated(out LinkLabel? owner)
? base.ElementProviderFromPoint(x, y)
: HitTest((int)x, (int)y) ?? base.ElementProviderFromPoint(x, y);
internal override IRawElementProviderFragment.Interface? FragmentNavigate(NavigateDirection direction)
=> direction switch
{
NavigateDirection.NavigateDirection_FirstChild
=> !this.TryGetOwnerAs(out LinkLabel? owner) ? null : owner.Links.Count != 0
? owner.Links[0].AccessibleObject
: null,
NavigateDirection.NavigateDirection_LastChild
=> !this.TryGetOwnerAs(out LinkLabel? owner) ? null : owner.Links.Count != 0
? owner.Links[^1].AccessibleObject
: null,
_ => base.FragmentNavigate(direction),
};
internal override IRawElementProviderFragmentRoot.Interface FragmentRoot => this;
public override AccessibleObject? GetChild(int index) =>
this.TryGetOwnerAs(out LinkLabel? owner) && index >= 0 && index < GetChildCount()
? owner.Links[index].AccessibleObject
: null;
private protected override bool IsInternal => true;
public override int GetChildCount() => this.TryGetOwnerAs(out LinkLabel? owner) ? owner.Links.Count : 0;
internal override VARIANT GetPropertyValue(UIA_PROPERTY_ID propertyID)
=> propertyID switch
{
UIA_PROPERTY_ID.UIA_HasKeyboardFocusPropertyId => VARIANT.False,
UIA_PROPERTY_ID.UIA_IsKeyboardFocusablePropertyId => VARIANT.False,
_ => base.GetPropertyValue(propertyID)
};
public override AccessibleObject? HitTest(int x, int y)
{
if (!this.IsOwnerHandleCreated(out LinkLabel? owner))
{
return null;
}
Point p = owner.PointToClient(new Point(x, y));
Link? hit = owner.PointInLink(p.X, p.Y);
if (hit is not null)
{
return hit.AccessibleObject;
}
return Bounds.Contains(x, y) ? this : null;
}
internal override bool IsIAccessibleExSupported() => true;
internal override int[] RuntimeId => _runtimeId ??= base.RuntimeId;
}
}
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