public static string SetAccessibilityLabel(this UIBarItem Control, Element Element, string _defaultAccessibilityLabel = null)
{
if (Element == null || Control == null)
{
return(_defaultAccessibilityLabel);
}
if (_defaultAccessibilityLabel == null)
{
_defaultAccessibilityLabel = Control.AccessibilityLabel;
}
Control.AccessibilityLabel = (string)Element.GetValue(AutomationProperties.NameProperty) ?? _defaultAccessibilityLabel;
return(_defaultAccessibilityLabel);
}
public static string SetAccessibilityHint(this UIBarItem Control, Element Element, string _defaultAccessibilityHint = null)
{
if (Element == null || Control == null)
{
return(_defaultAccessibilityHint);
}
if (_defaultAccessibilityHint == null)
{
_defaultAccessibilityHint = Control.AccessibilityHint;
}
Control.AccessibilityHint = (string)Element.GetValue(AutomationProperties.HelpTextProperty) ?? _defaultAccessibilityHint;
return(_defaultAccessibilityHint);
}
private static void WireUpEnabledToCanExecute(ToolBarButton button, UIBarItem uiButton)
{
if (button.Command != null)
button.Command.CanExecuteChanged += (s, e) =>
uiButton.InvokeOnMainThread(() =>
{
var enabled = button.Command.CanExecute(button.CommandParameter);
if (uiButton.Enabled == enabled) return;
uiButton.Enabled = enabled;
if (uiButton.Image != null)
uiButton.Image = ImageHelper.AdjustOpacity(uiButton.Image, enabled ? 1 : 0.5f);
});
uiButton.Enabled = button.Command == null || button.Command.CanExecute(button.CommandParameter);
if (!uiButton.Enabled && uiButton.Image != null)
uiButton.Image = ImageHelper.AdjustOpacity(uiButton.Image, 0.5f);
}
private static async void SetImage(UIBarItem uiButton, ImageSource source)
{
uiButton.Image = await source.GetImageAsync();
}