maui-linux/Xamarin.Forms.Platform.UAP/ViewRenderer.cs

140 строки
4.4 KiB
C#
Исходник Обычный вид История

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