/// <summary>
/// Called when <see cref="AddCategoryCommand" /> is executed and adds the given <see cref="WallpaperCategory" /> object.
/// </summary>
/// <param name="wallpaperCategory">
/// The <see cref="WallpaperCategory" /> object to add.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="wallpaperCategory" /> is <c>null</c>.
/// </exception>
/// <seealso cref="AddCategoryCommand" />
protected void AddCategoryCommand_Execute(WallpaperCategory wallpaperCategory)
{
if (wallpaperCategory == null)
{
throw new ArgumentNullException();
}
try {
this.Add(this.RequestWallpaperCategoryVM(wallpaperCategory));
} catch (Exception exception) {
this.OnUnhandledCommandException(new CommandExceptionEventArgs(this.AddCategoryCommand, exception));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WallpaperCategoryVM" /> class.
/// </summary>
/// <param name="category">
/// The <see cref="WallpaperManager.Models.Wallpaper" /> which should be wrapped by this View Model.
/// </param>
/// <param name="wallpaperChangerVM">
/// The <see cref="ViewModels.WallpaperChangerVM" /> instance used to control cycle operations
/// performed by this View Model.
/// </param>
/// <param name="requestConfigureSelected">
/// The delegate invoked to request the configuration of the selected <see cref="WallpaperVM" /> instances.
/// </param>
/// <param name="requestConfigureDefaultSettings">
/// The delegate invoked to request the configuration of the <see cref="WallpaperDefaultSettings" />.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="category" /> or <paramref name="wallpaperChangerVM" /> or
/// <paramref name="requestConfigureSelected" /> or <paramref name="requestConfigureDefaultSettings" /> is <c>null</c>.
/// </exception>
/// <commondoc select='ViewModels/General/seealso' />
public WallpaperCategoryVM(
WallpaperCategory category,
WallpaperChangerVM wallpaperChangerVM,
Action <WallpaperCategoryVM> requestConfigureSelected,
Action <WallpaperCategoryVM> requestConfigureDefaultSettings)
{
this.Category = category;
this.WallpaperChangerVM = wallpaperChangerVM;
this.RequestConfigureSelected = requestConfigureSelected;
this.RequestConfigureDefaultSettings = requestConfigureDefaultSettings;
CollectionChangedEventManager.AddListener(category, this);
// Simulate adding of all wallpapers to the category so that a WallpaperVM is created for any Wallpaper instance.
this.handleCategoryCollectionChanged = true;
this.Category_CollectionChanged(
this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, category));
this.selectedWallpaperVMs = new ReadOnlyCollection <WallpaperVM>(new List <WallpaperVM>());
PropertyChangedEventManager.AddListener(wallpaperChangerVM, this, string.Empty);
this.WallpaperChangerVM_PropertyChanged(this, new PropertyChangedEventArgs("ActiveWallpapers"));
}
/// <summary>
/// Creates a new <see cref="WallpaperCategoryVM" /> from a given <see cref="WallpaperCategory" />.
/// </summary>
/// <param name="category">
/// The <see cref="WallpaperCategory" /> instance to be wrapped by a new <see cref="WallpaperCategoryVM" />.
/// </param>
/// <returns>
/// The new <see cref="WallpaperCategoryVM" /> instance.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="category" /> is <c>null</c>.
/// </exception>
/// <seealso cref="WallpaperCategory">WallpaperCategory Class</seealso>
/// <seealso cref="WallpaperCategoryVM">WallpaperCategoryVM Class</seealso>
private WallpaperCategoryVM WallpaperCategoryCollectionVM_RequestWallpaperCategoryVM(WallpaperCategory category)
{
if (category == null)
{
throw new ArgumentNullException();
}
// Provide the View Model with a new WallpaperCategoryVM object.
return(new WallpaperCategoryVM(
category,
this.WallpaperChangerVM,
this.WallpaperCategoryVM_RequestConfigureSelected,
this.WallpaperCategoryVM_RequestConfigureDefaultSettings));
}
/// <summary>
/// Determines if <see cref="AddCategoryCommand" /> can be executed.
/// </summary>
/// <param name="wallpaperCategory">
/// The <see cref="WallpaperCategory" /> object to add.
/// </param>
/// <returns>
/// A <see cref="bool" /> indicating whether the command can be executed or not.
/// </returns>
/// <seealso cref="AddCategoryCommand" />
protected bool AddCategoryCommand_CanExecute(WallpaperCategory wallpaperCategory)
{
return(true);
}