зеркало из https://github.com/DeGsoft/maui-linux.git
194 строки
5.6 KiB
C#
194 строки
5.6 KiB
C#
using System;
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using System.ComponentModel;
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using System.Linq;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Media;
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using Xamarin.Forms.Internals;
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namespace Xamarin.Forms.Platform.UWP
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{
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public class DatePickerRenderer : ViewRenderer<DatePicker, Windows.UI.Xaml.Controls.DatePicker>, ITabStopOnDescendants
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{
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Brush _defaultBrush;
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bool _fontApplied;
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FontFamily _defaultFontFamily;
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protected override void Dispose(bool disposing)
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{
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if (disposing && Control != null)
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{
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Control.DateChanged -= OnControlDateChanged;
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Control.Loaded -= ControlOnLoaded;
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}
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base.Dispose(disposing);
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}
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protected override void OnElementChanged(ElementChangedEventArgs<DatePicker> e)
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{
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if (e.NewElement != null)
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{
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if (Control == null)
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{
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var picker = new Windows.UI.Xaml.Controls.DatePicker();
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SetNativeControl(picker);
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Control.Loaded += ControlOnLoaded;
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Control.DateChanged += OnControlDateChanged;
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}
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else
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{
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WireUpFormsVsm();
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}
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UpdateMinimumDate();
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UpdateMaximumDate();
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UpdateDate(e.NewElement.Date);
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UpdateFlowDirection();
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}
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base.OnElementChanged(e);
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}
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void ControlOnLoaded(object sender, RoutedEventArgs routedEventArgs)
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{
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WireUpFormsVsm();
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// The defaults from the control template won't be available
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// right away; we have to wait until after the template has been applied
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_defaultBrush = Control.Foreground;
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_defaultFontFamily = Control.FontFamily;
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UpdateFont();
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UpdateTextColor();
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}
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void WireUpFormsVsm()
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{
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if (!Element.UseFormsVsm())
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{
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return;
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}
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InterceptVisualStateManager.Hook(Control.GetFirstDescendant<StackPanel>(), Control, Element);
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// We also have to intercept the VSM changes on the DatePicker's button
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var button = Control.GetDescendantsByName<Windows.UI.Xaml.Controls.Button>("FlyoutButton").FirstOrDefault();
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InterceptVisualStateManager.Hook(button.GetFirstDescendant<Windows.UI.Xaml.Controls.Grid>(), button, Element);
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}
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protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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base.OnElementPropertyChanged(sender, e);
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if (e.PropertyName == DatePicker.DateProperty.PropertyName)
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UpdateDate(Element.Date);
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else if (e.PropertyName == DatePicker.MaximumDateProperty.PropertyName)
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UpdateMaximumDate();
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else if (e.PropertyName == DatePicker.MinimumDateProperty.PropertyName)
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UpdateMinimumDate();
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else if (e.PropertyName == DatePicker.TextColorProperty.PropertyName)
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UpdateTextColor();
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else if (e.PropertyName == VisualElement.FlowDirectionProperty.PropertyName)
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UpdateFlowDirection();
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else if (e.PropertyName == DatePicker.FontAttributesProperty.PropertyName || e.PropertyName == DatePicker.FontFamilyProperty.PropertyName || e.PropertyName == DatePicker.FontSizeProperty.PropertyName)
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UpdateFont();
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}
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protected override bool PreventGestureBubbling { get; set; } = true;
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void OnControlDateChanged(object sender, DatePickerValueChangedEventArgs e)
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{
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if (Element == null)
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return;
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if (Element.Date.CompareTo(e.NewDate.Date) != 0)
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{
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var date = e.NewDate.Date.Clamp(Element.MinimumDate, Element.MaximumDate);
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Element.Date = date;
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// set the control date-time to clamped value, if it exceeded the limits at the time of installation.
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if (date != e.NewDate.Date)
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{
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UpdateDate(date);
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Control.UpdateLayout();
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}
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((IVisualElementController)Element).InvalidateMeasure(InvalidationTrigger.SizeRequestChanged);
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}
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}
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void UpdateDate(DateTime date)
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{
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if (Control != null)
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Control.Date = new DateTimeOffset(new DateTime(date.Ticks, DateTimeKind.Unspecified));
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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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void UpdateFont()
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{
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if (Control == null)
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return;
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DatePicker datePicker = Element;
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if (datePicker == null)
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return;
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bool datePickerIsDefault = datePicker.FontFamily == null && datePicker.FontSize == Device.GetNamedSize(NamedSize.Default, typeof(DatePicker), true) && datePicker.FontAttributes == FontAttributes.None;
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if (datePickerIsDefault && !_fontApplied)
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return;
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if (datePickerIsDefault)
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{
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// ReSharper disable AccessToStaticMemberViaDerivedType
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Control.ClearValue(ComboBox.FontStyleProperty);
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Control.ClearValue(ComboBox.FontSizeProperty);
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Control.ClearValue(ComboBox.FontFamilyProperty);
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Control.ClearValue(ComboBox.FontWeightProperty);
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Control.ClearValue(ComboBox.FontStretchProperty);
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// ReSharper restore AccessToStaticMemberViaDerivedType
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}
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else
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{
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Control.ApplyFont(datePicker);
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}
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_fontApplied = true;
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}
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void UpdateMaximumDate()
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{
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if (Element != null && Control != null)
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Control.MaxYear = new DateTimeOffset(new DateTime(Element.MaximumDate.Ticks, DateTimeKind.Unspecified));
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}
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void UpdateMinimumDate()
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{
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DateTime mindate = Element.MinimumDate;
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try
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{
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if (Element != null && Control != null)
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Control.MinYear = new DateTimeOffset(new DateTime(Element.MinimumDate.Ticks, DateTimeKind.Unspecified));
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}
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catch (ArgumentOutOfRangeException)
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{
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// This will be thrown when mindate equals DateTime.MinValue and the UTC offset is positive
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// because the resulting DateTimeOffset.UtcDateTime will be out of range. In that case let's
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// specify the Kind as UTC so there is no offset.
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mindate = DateTime.SpecifyKind(mindate, DateTimeKind.Utc);
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Control.MinYear = new DateTimeOffset(mindate);
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}
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}
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void UpdateTextColor()
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{
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Color color = Element.TextColor;
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Control.Foreground = color.IsDefault ? (_defaultBrush ?? color.ToBrush()) : color.ToBrush();
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}
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}
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} |