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using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Entities;
using MediaBrowser.UI.Pages;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace MediaBrowser.UI.ViewModels
{
/// <summary>
/// Class DtoBaseItemViewModel
/// </summary>
public class DtoBaseItemViewModel : BaseViewModel
{
/// <summary>
/// The _average primary image aspect ratio
/// </summary>
private double _averagePrimaryImageAspectRatio;
/// <summary>
/// Gets the aspect ratio that should be used if displaying the primary image
/// </summary>
/// <value>The average primary image aspect ratio.</value>
public double AveragePrimaryImageAspectRatio
{
get { return _averagePrimaryImageAspectRatio; }
set
{
_averagePrimaryImageAspectRatio = value;
OnPropertyChanged("AveragePrimaryImageAspectRatio");
}
}
/// <summary>
/// The _parent display preferences
/// </summary>
private DisplayPreferences _parentDisplayPreferences;
/// <summary>
/// Gets of sets the current DisplayPreferences
/// </summary>
/// <value>The parent display preferences.</value>
public DisplayPreferences ParentDisplayPreferences
{
get { return _parentDisplayPreferences; }
set
{
_parentDisplayPreferences = value;
NotifyDisplayPreferencesChanged();
}
}
/// <summary>
/// The _item
/// </summary>
private BaseItemDto _item;
/// <summary>
/// Gets or sets the item.
/// </summary>
/// <value>The item.</value>
public BaseItemDto Item
{
get { return _item; }
set
{
_item = value;
OnPropertyChanged("Item");
}
}
/// <summary>
/// Notifies the display preferences changed.
/// </summary>
public void NotifyDisplayPreferencesChanged()
{
OnPropertyChanged("DisplayPreferences");
}
/// <summary>
/// Gets an image url that can be used to download an image from the api
/// </summary>
/// <param name="imageType">The type of image requested</param>
/// <param name="imageIndex">The image index, if there are multiple. Currently only applies to backdrops. Supply null or 0 for first backdrop.</param>
/// <returns>System.String.</returns>
public string GetImageUrl(ImageType imageType, int? imageIndex = null)
{
var height = ParentDisplayPreferences.PrimaryImageHeight;
var averageAspectRatio = BaseFolderPage.GetAspectRatio(imageType, AveragePrimaryImageAspectRatio);
var width = height * averageAspectRatio;
var imageOptions = new ImageOptions
{
ImageType = imageType,
ImageIndex = imageIndex,
Height = height
};
if (imageType == ImageType.Primary)
{
var currentAspectRatio = imageType == ImageType.Primary ? Item.PrimaryImageAspectRatio ?? width / height : width / height;
// Preserve the exact AR if it deviates from the average significantly
var preserveExactAspectRatio = Math.Abs(currentAspectRatio - averageAspectRatio) > .10;
if (!preserveExactAspectRatio)
{
imageOptions.Width = Convert.ToInt32(width);
}
}
return App.Instance.ApiClient.GetImageUrl(Item, imageOptions);
}
/// <summary>
/// Gets the average primary image aspect ratio.
/// </summary>
/// <param name="items">The items.</param>
/// <returns>System.Double.</returns>
/// <exception cref="System.ArgumentNullException">items</exception>
public static double GetAveragePrimaryImageAspectRatio(IEnumerable<BaseItemDto> items)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
double total = 0;
var count = 0;
foreach (var child in items)
{
var ratio = child.PrimaryImageAspectRatio ?? 0;
if (ratio.Equals(0))
{
continue;
}
total += ratio;
count++;
}
return count == 0 ? 1 : total / count;
}
/// <summary>
/// Gets the observable items.
/// </summary>
/// <param name="items">The items.</param>
/// <returns>ObservableCollection{DtoBaseItemViewModel}.</returns>
public static ObservableCollection<DtoBaseItemViewModel> GetObservableItems(BaseItemDto[] items)
{
return GetObservableItems(items, GetAveragePrimaryImageAspectRatio(items));
}
/// <summary>
/// Gets the observable items.
/// </summary>
/// <param name="items">The items.</param>
/// <param name="averagePrimaryImageAspectRatio">The average primary image aspect ratio.</param>
/// <param name="parentDisplayPreferences">The parent display preferences.</param>
/// <returns>ObservableCollection{DtoBaseItemViewModel}.</returns>
/// <exception cref="System.ArgumentNullException">items</exception>
public static ObservableCollection<DtoBaseItemViewModel> GetObservableItems(IEnumerable<BaseItemDto> items, double averagePrimaryImageAspectRatio, DisplayPreferences parentDisplayPreferences = null)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
return new ObservableCollection<DtoBaseItemViewModel>(items.Select(i => new DtoBaseItemViewModel
{
Item = i,
ParentDisplayPreferences = parentDisplayPreferences,
AveragePrimaryImageAspectRatio = averagePrimaryImageAspectRatio
}));
}
}
}
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