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

194 строки
5.6 KiB
C#

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