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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
namespace MaterialDesignThemes.Wpf
{
/// <summary>
/// A custom control implementing a rating bar.
/// The icon aka content may be set as a DataTemplate via the ButtonContentTemplate property.
/// </summary>
public class RatingBar : Control
{
public static RoutedCommand SelectRatingCommand = new RoutedCommand();
static RatingBar()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(RatingBar), new FrameworkPropertyMetadata(typeof(RatingBar)));
}
private readonly ObservableCollection<RatingBarButton> _ratingButtonsInternal = new ObservableCollection<RatingBarButton>();
private readonly ReadOnlyObservableCollection<RatingBarButton> _ratingButtons;
public RatingBar()
{
CommandBindings.Add(new CommandBinding(SelectRatingCommand, SelectItemHandler));
_ratingButtons = new ReadOnlyObservableCollection<RatingBarButton>(_ratingButtonsInternal);
}
private void SelectItemHandler(object sender, ExecutedRoutedEventArgs executedRoutedEventArgs)
{
if (executedRoutedEventArgs.Parameter is int)
Value = (int) executedRoutedEventArgs.Parameter;
}
public static readonly DependencyProperty MinProperty = DependencyProperty.Register(
nameof(Min), typeof (int), typeof (RatingBar), new PropertyMetadata(1, MinPropertyChangedCallback));
public int Min
{
get { return (int) GetValue(MinProperty); }
set { SetValue(MinProperty, value); }
}
public static readonly DependencyProperty MaxProperty = DependencyProperty.Register(
nameof(Max), typeof (int), typeof (RatingBar), new PropertyMetadata(5, MaxPropertyChangedCallback));
public int Max
{
get { return (int) GetValue(MaxProperty); }
set { SetValue(MaxProperty, value); }
}
public static readonly DependencyProperty ValueProperty = DependencyProperty.Register(
nameof(Value), typeof (int), typeof (RatingBar), new PropertyMetadata(0, ValuePropertyChangedCallback));
private static void ValuePropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
foreach (var button in ((RatingBar) dependencyObject).RatingButtons)
button.IsWithinSelectedValue = button.Value <= (int)dependencyPropertyChangedEventArgs.NewValue;
}
public int Value
{
get { return (int) GetValue(ValueProperty); }
set { SetValue(ValueProperty, value); }
}
public ReadOnlyObservableCollection<RatingBarButton> RatingButtons => _ratingButtons;
public static readonly DependencyProperty ValueItemContainerButtonStyleProperty = DependencyProperty.Register(
nameof(ValueItemContainerButtonStyle), typeof (Style), typeof (RatingBar), new PropertyMetadata(default(Style)));
public Style ValueItemContainerButtonStyle
{
get { return (Style) GetValue(ValueItemContainerButtonStyleProperty); }
set { SetValue(ValueItemContainerButtonStyleProperty, value); }
}
public static readonly DependencyProperty ValueItemTemplateProperty = DependencyProperty.Register(
nameof(ValueItemTemplate), typeof (DataTemplate), typeof (RatingBar), new PropertyMetadata(default(DataTemplate)));
public DataTemplate ValueItemTemplate
{
get { return (DataTemplate) GetValue(ValueItemTemplateProperty); }
set { SetValue(ValueItemTemplateProperty, value); }
}
public static readonly DependencyProperty ValueItemTemplateSelectorProperty = DependencyProperty.Register(
nameof(ValueItemTemplateSelector), typeof (DataTemplateSelector), typeof (RatingBar), new PropertyMetadata(default(DataTemplateSelector)));
public DataTemplateSelector ValueItemTemplateSelector
{
get { return (DataTemplateSelector) GetValue(ValueItemTemplateSelectorProperty); }
set { SetValue(ValueItemTemplateSelectorProperty, value); }
}
public static readonly DependencyProperty OrientationProperty = DependencyProperty.Register(
nameof(Orientation), typeof (Orientation), typeof (RatingBar), new PropertyMetadata(default(Orientation)));
public Orientation Orientation
{
get { return (Orientation) GetValue(OrientationProperty); }
set { SetValue(OrientationProperty, value); }
}
private static void MaxPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
((RatingBar)dependencyObject).RebuildButtons();
}
private static void MinPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
((RatingBar)dependencyObject).RebuildButtons();
}
private void RebuildButtons()
{
_ratingButtonsInternal.Clear();
for (var i = Min; i <= Max; i++)
{
_ratingButtonsInternal.Add(new RatingBarButton
{
Content = i,
ContentTemplate = ValueItemTemplate,
ContentTemplateSelector = ValueItemTemplateSelector,
IsWithinSelectedValue = i <= Value,
Style = ValueItemContainerButtonStyle,
Value = i,
});
}
}
public override void OnApplyTemplate()
{
RebuildButtons();
base.OnApplyTemplate();
}
}
}
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