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

119 строки
2.9 KiB
C#

using System;
using System.ComponentModel;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
public class DatePickerRenderer : ViewRenderer<DatePicker, FormsDatePicker>, IWrapperAware
{
Brush _defaultBrush;
public void NotifyWrapped()
{
if (Control != null)
{
Control.ForceInvalidate += PickerOnForceInvalidate;
}
}
protected override void Dispose(bool disposing)
{
if (disposing && Control != null)
{
Control.ForceInvalidate -= PickerOnForceInvalidate;
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 FormsDatePicker();
SetNativeControl(picker);
Control.Loaded += ControlOnLoaded;
Control.DateChanged += OnControlDateChanged;
}
UpdateMinimumDate();
UpdateMaximumDate();
UpdateDate(e.NewElement.Date);
}
base.OnElementChanged(e);
}
void ControlOnLoaded(object sender, RoutedEventArgs routedEventArgs)
{
// 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;
UpdateTextColor();
}
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();
}
void OnControlDateChanged(object sender, DatePickerValueChangedEventArgs e)
{
Element.Date = e.NewDate.Date;
DateTime currentDate = Element.Date;
if (currentDate != e.NewDate.Date) // Match coerced value
UpdateDate(currentDate);
Element.InvalidateMeasure(InvalidationTrigger.SizeRequestChanged);
}
void PickerOnForceInvalidate(object sender, EventArgs eventArgs)
{
Element?.InvalidateMeasure(InvalidationTrigger.SizeRequestChanged);
}
void UpdateDate(DateTime date)
{
Control.Date = date;
}
void UpdateMaximumDate()
{
DateTime maxdate = Element.MaximumDate;
Control.MaxYear = new DateTimeOffset(maxdate.Date);
}
void UpdateMinimumDate()
{
DateTime mindate = Element.MinimumDate;
Control.MinYear = new DateTimeOffset(mindate);
}
void UpdateTextColor()
{
Color color = Element.TextColor;
Control.Foreground = color.IsDefault ? (_defaultBrush ?? color.ToBrush()) : color.ToBrush();
}
}
}