134 строки
4.2 KiB
C#
134 строки
4.2 KiB
C#
using Windows.UI.Xaml;
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using Windows.UI.Xaml.Automation.Peers;
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namespace Xamarin.Forms.Platform.UWP
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{
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public class ViewRenderer<TElement, TNativeElement> : VisualElementRenderer<TElement, TNativeElement> where TElement : View where TNativeElement : FrameworkElement
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{
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string _defaultAutomationPropertiesName;
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AccessibilityView? _defaultAutomationPropertiesAccessibilityView;
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string _defaultAutomationPropertiesHelpText;
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UIElement _defaultAutomationPropertiesLabeledBy;
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protected override void OnElementChanged(ElementChangedEventArgs<TElement> e)
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{
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base.OnElementChanged(e);
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if (e.NewElement != null)
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{
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UpdateBackgroundColor();
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UpdateFlowDirection();
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}
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}
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protected override void SetAutomationId(string id)
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{
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if (Control == null)
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{
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base.SetAutomationId(id);
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}
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else
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{
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SetValue(Windows.UI.Xaml.Automation.AutomationProperties.AutomationIdProperty, $"{id}_Container");
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.AutomationIdProperty, id);
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}
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}
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protected override void SetAutomationPropertiesName()
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{
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if (Control == null)
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{
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base.SetAutomationPropertiesName();
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return;
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}
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if (Element == null)
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return;
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if (_defaultAutomationPropertiesName == null)
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_defaultAutomationPropertiesName = (string)Control.GetValue(Windows.UI.Xaml.Automation.AutomationProperties.NameProperty);
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var elemValue = (string)Element.GetValue(AutomationProperties.NameProperty);
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if (!string.IsNullOrWhiteSpace(elemValue))
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.NameProperty, elemValue);
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else
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.NameProperty, _defaultAutomationPropertiesName);
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}
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protected override void SetAutomationPropertiesAccessibilityView()
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{
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if (Control == null)
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{
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base.SetAutomationPropertiesAccessibilityView();
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return;
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}
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if (Element == null)
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return;
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if (!_defaultAutomationPropertiesAccessibilityView.HasValue)
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_defaultAutomationPropertiesAccessibilityView = (AccessibilityView)Control.GetValue(Windows.UI.Xaml.Automation.AutomationProperties.AccessibilityViewProperty);
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var newValue = _defaultAutomationPropertiesAccessibilityView;
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var elemValue = (bool?)Element.GetValue(AutomationProperties.IsInAccessibleTreeProperty);
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if (elemValue == true)
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newValue = AccessibilityView.Content;
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else if (elemValue == false)
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newValue = AccessibilityView.Raw;
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.AccessibilityViewProperty, newValue);
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}
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protected override void SetAutomationPropertiesHelpText()
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{
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if (Control == null)
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{
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base.SetAutomationPropertiesHelpText();
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return;
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}
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if (Element == null)
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return;
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if (_defaultAutomationPropertiesHelpText == null)
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_defaultAutomationPropertiesHelpText = (string)Control.GetValue(Windows.UI.Xaml.Automation.AutomationProperties.HelpTextProperty);
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var elemValue = (string)Element.GetValue(AutomationProperties.HelpTextProperty);
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if (!string.IsNullOrWhiteSpace(elemValue))
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.HelpTextProperty, elemValue);
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else
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.HelpTextProperty, _defaultAutomationPropertiesHelpText);
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}
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protected override void SetAutomationPropertiesLabeledBy()
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{
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if (Control == null)
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{
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base.SetAutomationPropertiesLabeledBy();
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return;
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}
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if (Element == null)
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return;
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if (_defaultAutomationPropertiesLabeledBy == null)
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_defaultAutomationPropertiesLabeledBy = (UIElement)Control.GetValue(Windows.UI.Xaml.Automation.AutomationProperties.LabeledByProperty);
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var elemValue = (VisualElement)Element.GetValue(AutomationProperties.LabeledByProperty);
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var renderer = elemValue?.GetOrCreateRenderer();
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var nativeElement = renderer?.GetNativeElement();
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if (nativeElement != null)
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.LabeledByProperty, nativeElement);
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else
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Control.SetValue(Windows.UI.Xaml.Automation.AutomationProperties.LabeledByProperty, _defaultAutomationPropertiesLabeledBy);
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}
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void UpdateFlowDirection()
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{
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Control.UpdateFlowDirection(Element);
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}
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}
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} |