public override void OnInitializeAccessibilityNodeInfo(global::Android.Views.View host, AccessibilityNodeInfoCompat info)
{
base.OnInitializeAccessibilityNodeInfo(host, info);
if (Element == null)
{
return;
}
if (info == null)
{
return;
}
var hint = SemanticEffect.GetHint(Element);
if (!string.IsNullOrEmpty(hint))
{
info.HintText = hint;
if (host is EditText)
{
info.ShowingHintText = false;
}
}
var desc = SemanticEffect.GetDescription(Element);
if (!string.IsNullOrEmpty(desc))
{
info.ContentDescription = desc;
}
}
protected override void Update(global::Android.Views.View view, SemanticEffectRouter effect)
{
var isHeading = SemanticEffect.GetHeadingLevel(Element) != CommunityToolkit.Effects.Semantic.HeadingLevel.None;
ViewCompat.SetAccessibilityHeading(view, isHeading);
var desc = SemanticEffect.GetDescription(Element);
var hint = SemanticEffect.GetHint(Element);
if (!string.IsNullOrEmpty(hint) || !string.IsNullOrEmpty(desc))
{
if (semanticAccessibilityDelegate == null)
{
semanticAccessibilityDelegate = new SemanticAccessibilityDelegate(Element);
ViewCompat.SetAccessibilityDelegate(view, semanticAccessibilityDelegate);
}
}
else if (semanticAccessibilityDelegate != null)
{
semanticAccessibilityDelegate = null;
ViewCompat.SetAccessibilityDelegate(view, null);
}
if (semanticAccessibilityDelegate != null)
{
semanticAccessibilityDelegate.Element = Element;
view.ImportantForAccessibility = global::Android.Views.ImportantForAccessibility.Yes;
}
}
protected override void Update(UIView view, SemanticEffectRouter effect)
{
var isHeading = SemanticEffect.GetHeadingLevel(Element) != CommunityToolkit.Effects.Semantic.HeadingLevel.None;
if (isHeading)
{
view.AccessibilityTraits |= UIAccessibilityTrait.Header;
}
else
{
view.AccessibilityTraits &= ~UIAccessibilityTrait.Header;
}
var desc = SemanticEffect.GetDescription(Element);
var hint = SemanticEffect.GetHint(Element);
view.AccessibilityLabel = desc;
view.AccessibilityHint = hint;
// UIControl elements automatically have IsAccessibilityElement set to true
if (view is not UIControl && (!string.IsNullOrWhiteSpace(hint) || !string.IsNullOrWhiteSpace(desc)))
{
view.IsAccessibilityElement = true;
}
}
protected override void Update(FrameworkElement view, SemanticEffectRouter effect)
{
var headingLevel = (AutomationHeadingLevel)((int)SemanticEffect.GetHeadingLevel(Element));
AutomationProperties.SetHeadingLevel(view, headingLevel);
AutomationProperties.SetName(view, SemanticEffect.GetDescription(Element) ?? string.Empty);
AutomationProperties.SetHelpText(view, SemanticEffect.GetHint(Element) ?? string.Empty);
}
protected override void Update(UIView view, A11YTools.NativeSemanticEffect effect)
{
bool isHeading = SemanticEffect.GetIsHeading(Element);
if (isHeading)
{
view.AccessibilityTraits |= UIAccessibilityTrait.Header;
}
else
{
view.AccessibilityTraits &= ~UIAccessibilityTrait.Header;
}
}
protected override void Update(global::Android.Views.View view, SemanticEffectRouter effect)
{
var isHeading = SemanticEffect.GetHeadingLevel(Element) != CommunityToolkit.Effects.Semantic.HeadingLevel.None;
ViewCompat.SetAccessibilityHeading(view, isHeading);
var a11yVisibility = SemanticEffect.GetSemanticInclusion(Element);
switch (a11yVisibility)
{
case SemanticInclusion.Default:
ViewCompat.SetImportantForAccessibility(view, ViewCompat.ImportantForAccessibilityAuto);
break;
case SemanticInclusion.Include:
ViewCompat.SetImportantForAccessibility(view, ViewCompat.ImportantForAccessibilityYes);
break;
case SemanticInclusion.Exclude:
ViewCompat.SetImportantForAccessibility(view, ViewCompat.ImportantForAccessibilityNo);
break;
case SemanticInclusion.ExcludeWithChildren:
ViewCompat.SetImportantForAccessibility(view, ViewCompat.ImportantForAccessibilityNoHideDescendants);
break;
}
var desc = SemanticEffect.GetDescription(Element);
var hint = SemanticEffect.GetHint(Element);
if (!string.IsNullOrWhiteSpace(hint) || !string.IsNullOrWhiteSpace(desc))
{
if (semanticAccessibilityDelegate == null)
{
semanticAccessibilityDelegate = new SemanticAccessibilityDelegate(Element);
ViewCompat.SetAccessibilityDelegate(view, semanticAccessibilityDelegate);
}
}
else if (semanticAccessibilityDelegate != null)
{
semanticAccessibilityDelegate = null;
ViewCompat.SetAccessibilityDelegate(view, null);
}
if (semanticAccessibilityDelegate != null)
{
semanticAccessibilityDelegate.Element = Element;
view.ImportantForAccessibility = global::Android.Views.ImportantForAccessibility.Yes;
}
}
protected override void Update(UIView view, SemanticEffectRouter effect)
{
var isHeading = SemanticEffect.GetHeadingLevel(Element) != CommunityToolkit.Effects.Semantic.HeadingLevel.None;
if (isHeading)
{
view.AccessibilityTraits |= UIAccessibilityTrait.Header;
}
else
{
view.AccessibilityTraits &= ~UIAccessibilityTrait.Header;
}
var semanticInclusion = SemanticEffect.GetSemanticInclusion(Element);
switch (semanticInclusion)
{
case SemanticInclusion.Default:
view.IsAccessibilityElement = view is UIControl;
view.AccessibilityElementsHidden = false;
break;
case SemanticInclusion.Include:
view.IsAccessibilityElement = true;
view.AccessibilityElementsHidden = false;
break;
case SemanticInclusion.Exclude:
view.IsAccessibilityElement = false;
view.AccessibilityElementsHidden = false;
break;
case SemanticInclusion.ExcludeWithChildren:
view.IsAccessibilityElement = false;
view.AccessibilityElementsHidden = true;
break;
}
var desc = SemanticEffect.GetDescription(Element);
var hint = SemanticEffect.GetHint(Element);
view.AccessibilityLabel = desc;
view.AccessibilityHint = hint;
// UIControl elements automatically have IsAccessibilityElement set to true
if (view is not UIControl && (!string.IsNullOrWhiteSpace(hint) || !string.IsNullOrWhiteSpace(desc)))
{
view.IsAccessibilityElement = true;
}
}
public override void OnInitializeAccessibilityNodeInfo(global::Android.Views.View host, AccessibilityNodeInfoCompat info)
{
base.OnInitializeAccessibilityNodeInfo(host, info);
if (Element == null)
{
return;
}
if (info == null)
{
return;
}
string?newText = null;
string?newContentDescription = null;
var desc = SemanticEffect.GetDescription(Element);
if (!string.IsNullOrEmpty(desc))
{
// Edit Text fields won't read anything for the content description
if (host is EditText et)
{
if (!string.IsNullOrEmpty(et.Text))
{
newText = $"{desc}, {et.Text}";
}
else
{
newText = $"{desc}";
}
}
else
{
newContentDescription = desc;
}
}
var hint = SemanticEffect.GetHint(Element);
if (!string.IsNullOrEmpty(hint))
{
// info HintText won't read anything back when using TalkBack pre API 26
if (XCT.SdkInt >= (int)BuildVersionCodes.O)
{
info.HintText = hint;
if (host is EditText)
{
info.ShowingHintText = false;
}
}
else
{
if (host is EditText et)
{
newText = newText ?? et.Text;
newText = $"{newText}, {hint}";
}
else if (host is TextView tv)
{
if (newContentDescription != null)
{
newText = $"{newContentDescription}, {hint}";
}
else if (!string.IsNullOrEmpty(tv.Text))
{
newText = $"{tv.Text}, {hint}";
}
else
{
newText = $"{hint}";
}
}
else
{
if (newContentDescription != null)
{
newText = $"{newContentDescription}, {hint}";
}
else
{
newText = $"{hint}";
}
}
newContentDescription = null;
}
}
if (!string.IsNullOrWhiteSpace(newContentDescription))
{
info.ContentDescription = newContentDescription;
}
if (!string.IsNullOrWhiteSpace(newText))
{
info.Text = newText;
}
}
protected override void Update(Android.Views.View view, A11YTools.NativeSemanticEffect effect)
{
bool isHeading = SemanticEffect.GetIsHeading(Element);
ViewCompat.SetAccessibilityHeading(view, isHeading);
}
void ExcludeButton_Clicked(object sender, System.EventArgs e)
{
SemanticEffect.SetSemanticInclusion(semanticInclusionSampleLayout, SemanticInclusion.ExcludeWithChildren);
}
