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using System;
using Xamarin.Forms.Platform;
namespace Xamarin.Forms
{
[RenderWith(typeof(_DatePickerRenderer))]
public class DatePicker : View, ITextElement,IElementConfiguration<DatePicker>
{
public static readonly BindableProperty FormatProperty = BindableProperty.Create(nameof(Format), typeof(string), typeof(DatePicker), "d");
public static readonly BindableProperty DateProperty = BindableProperty.Create(nameof(Date), typeof(DateTime), typeof(DatePicker), DateTime.Today, BindingMode.TwoWay, coerceValue: CoerceDate,
propertyChanged: DatePropertyChanged);
public static readonly BindableProperty MinimumDateProperty = BindableProperty.Create(nameof(MinimumDate), typeof(DateTime), typeof(DatePicker), new DateTime(1900, 1, 1),
validateValue: ValidateMinimumDate, coerceValue: CoerceMinimumDate);
public static readonly BindableProperty MaximumDateProperty = BindableProperty.Create(nameof(MaximumDate), typeof(DateTime), typeof(DatePicker), new DateTime(2100, 12, 31),
validateValue: ValidateMaximumDate, coerceValue: CoerceMaximumDate);
public static readonly BindableProperty TextColorProperty = TextElement.TextColorProperty;
readonly Lazy<PlatformConfigurationRegistry<DatePicker>> _platformConfigurationRegistry;
public DatePicker()
{
_platformConfigurationRegistry = new Lazy<PlatformConfigurationRegistry<DatePicker>>(() => new PlatformConfigurationRegistry<DatePicker>(this));
}
public DateTime Date
{
get { return (DateTime)GetValue(DateProperty); }
set { SetValue(DateProperty, value); }
}
public string Format
{
get { return (string)GetValue(FormatProperty); }
set { SetValue(FormatProperty, value); }
}
public DateTime MaximumDate
{
get { return (DateTime)GetValue(MaximumDateProperty); }
set { SetValue(MaximumDateProperty, value); }
}
public DateTime MinimumDate
{
get { return (DateTime)GetValue(MinimumDateProperty); }
set { SetValue(MinimumDateProperty, value); }
}
public Color TextColor
{
get { return (Color)GetValue(TextElement.TextColorProperty); }
set { SetValue(TextElement.TextColorProperty, value); }
}
public event EventHandler<DateChangedEventArgs> DateSelected;
static object CoerceDate(BindableObject bindable, object value)
{
var picker = (DatePicker)bindable;
DateTime dateValue = ((DateTime)value).Date;
if (dateValue > picker.MaximumDate)
dateValue = picker.MaximumDate;
if (dateValue < picker.MinimumDate)
dateValue = picker.MinimumDate;
return dateValue;
}
static object CoerceMaximumDate(BindableObject bindable, object value)
{
DateTime dateValue = ((DateTime)value).Date;
var picker = (DatePicker)bindable;
if (picker.Date > dateValue)
picker.Date = dateValue;
return dateValue;
}
static object CoerceMinimumDate(BindableObject bindable, object value)
{
DateTime dateValue = ((DateTime)value).Date;
var picker = (DatePicker)bindable;
if (picker.Date < dateValue)
picker.Date = dateValue;
return dateValue;
}
static void DatePropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
var datePicker = (DatePicker)bindable;
EventHandler<DateChangedEventArgs> selected = datePicker.DateSelected;
if (selected != null)
selected(datePicker, new DateChangedEventArgs((DateTime)oldValue, (DateTime)newValue));
}
static bool ValidateMaximumDate(BindableObject bindable, object value)
{
return (DateTime)value >= ((DatePicker)bindable).MinimumDate;
}
static bool ValidateMinimumDate(BindableObject bindable, object value)
{
return (DateTime)value <= ((DatePicker)bindable).MaximumDate;
}
public IPlatformElementConfiguration<T, DatePicker> On<T>() where T : IConfigPlatform
{
return _platformConfigurationRegistry.Value.On<T>();
}
void ITextElement.OnTextColorPropertyChanged(Color oldValue, Color newValue)
{
}
}
}
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