diff options
Diffstat (limited to 'MediaBrowser.UI/Pages/BaseListPage.cs')
| -rw-r--r-- | MediaBrowser.UI/Pages/BaseListPage.cs | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/MediaBrowser.UI/Pages/BaseListPage.cs b/MediaBrowser.UI/Pages/BaseListPage.cs new file mode 100644 index 000000000..040d6a525 --- /dev/null +++ b/MediaBrowser.UI/Pages/BaseListPage.cs @@ -0,0 +1,204 @@ +using MediaBrowser.Model.DTO; +using MediaBrowser.Model.Entities; +using MediaBrowser.UI.Controls; +using MediaBrowser.UI.ViewModels; +using System; +using System.Threading; +using System.Windows.Controls; + +namespace MediaBrowser.UI.Pages +{ + /// <summary> + /// Provides a base page for all list pages + /// </summary> + public abstract class BaseListPage : BaseFolderPage + { + /// <summary> + /// Gets or sets the current selection timer. + /// </summary> + /// <value>The current selection timer.</value> + private Timer CurrentSelectionTimer { get; set; } + + /// <summary> + /// Subclasses must provide the list box that holds the items + /// </summary> + /// <value>The items list.</value> + protected abstract ExtendedListBox ItemsList { get; } + + /// <summary> + /// Initializes a new instance of the <see cref="BaseListPage" /> class. + /// </summary> + /// <param name="itemId">The item id.</param> + protected BaseListPage(string itemId) + : base(itemId) + { + } + + /// <summary> + /// Raises the <see cref="E:Initialized" /> event. + /// </summary> + /// <param name="e">The <see cref="EventArgs" /> instance containing the event data.</param> + protected override void OnInitialized(EventArgs e) + { + base.OnInitialized(e); + + ItemsList.SelectionChanged += ItemsList_SelectionChanged; + ItemsList.ItemInvoked += ItemsList_ItemInvoked; + } + + /// <summary> + /// The _current item + /// </summary> + private DtoBaseItem _currentItem; + /// <summary> + /// Gets or sets the current selected item + /// </summary> + /// <value>The current item.</value> + public DtoBaseItem CurrentItem + { + get { return _currentItem; } + + set + { + _currentItem = value; + + // Update the current item index immediately + UpdateCurrentItemIndex(value); + + // Fire notification events after a short delay + // We don't want backdrops and logos reloading while the user is navigating quickly + if (CurrentSelectionTimer != null) + { + CurrentSelectionTimer.Change(500, Timeout.Infinite); + } + else + { + CurrentSelectionTimer = new Timer(CurrentItemChangedTimerCallback, value, 500, Timeout.Infinite); + } + } + } + + /// <summary> + /// Fires when the current item selection timer expires + /// </summary> + /// <param name="state">The state.</param> + private void CurrentItemChangedTimerCallback(object state) + { + Dispatcher.InvokeAsync(() => + { + // Fire notification events for the UI + OnPropertyChanged("CurrentItem"); + + // Alert subclasses + OnCurrentItemChanged(); + }); + + // Dispose the timer + CurrentSelectionTimer.Dispose(); + CurrentSelectionTimer = null; + } + + /// <summary> + /// Updates the current item index based on the current selection + /// </summary> + /// <param name="value">The value.</param> + private void UpdateCurrentItemIndex(DtoBaseItem value) + { + if (value == null) + { + CurrentItemIndex = -1; + } + else + { + CurrentItemIndex = ItemsList.SelectedIndex; + } + } + + /// <summary> + /// The _current item index + /// </summary> + private int _currentItemIndex; + /// <summary> + /// Gets of sets the index of the current item being displayed + /// </summary> + /// <value>The index of the current item.</value> + public int CurrentItemIndex + { + get { return _currentItemIndex; } + + set + { + _currentItemIndex = value; + OnPropertyChanged("CurrentItemIndex"); + } + } + + /// <summary> + /// Handles the list selection changed event to update the current item + /// </summary> + /// <param name="sender">The source of the event.</param> + /// <param name="e">The <see cref="SelectionChangedEventArgs" /> instance containing the event data.</param> + void ItemsList_SelectionChanged(object sender, SelectionChangedEventArgs e) + { + if (e.AddedItems.Count > 0) + { + CurrentItem = (e.AddedItems[0] as DtoBaseItemViewModel).Item; + } + else + { + CurrentItem = null; + } + } + + /// <summary> + /// Itemses the list_ item invoked. + /// </summary> + /// <param name="sender">The sender.</param> + /// <param name="e">The e.</param> + /// <exception cref="System.NotImplementedException"></exception> + void ItemsList_ItemInvoked(object sender, ItemEventArgs<object> e) + { + var model = e.Argument as DtoBaseItemViewModel; + + if (model != null) + { + App.Instance.NavigateToItem(model.Item); + } + } + + /// <summary> + /// Handles current item selection changes + /// </summary> + protected virtual void OnCurrentItemChanged() + { + if (CurrentItem != null) + { + SetBackdrops(CurrentItem); + } + } + + /// <summary> + /// Gets called anytime a DisplayPreferences property is updated + /// </summary> + public override void NotifyDisplayPreferencesChanged() + { + base.NotifyDisplayPreferencesChanged(); + + // Make sure the items list has been initialized + if (ItemsList != null) + { + if (DisplayPreferences.ScrollDirection == ScrollDirection.Horizontal) + { + ScrollViewer.SetHorizontalScrollBarVisibility(ItemsList, ScrollBarVisibility.Hidden); + ScrollViewer.SetVerticalScrollBarVisibility(ItemsList, ScrollBarVisibility.Disabled); + } + else + { + ScrollViewer.SetHorizontalScrollBarVisibility(ItemsList, ScrollBarVisibility.Disabled); + ScrollViewer.SetVerticalScrollBarVisibility(ItemsList, ScrollBarVisibility.Hidden); + } + } + } + + } +} |