void onListKeyUp(KeyEventArgs args)
{
if (KeyboardHelper.IsKeyPressed(ModifierKeys.Control) && args.Key == Key.A)
{
if (Selection.Items.Count() == Items.Count())
{
SelectedItemIDs.Clear();
}
else
{
SelectedItemIDs.AddRange(Items.Select(Items => Items.Item.ItemId));
}
}
}
void onItemClicked(ItemClickedEventArgs args)
{
var curItem = args.Item;
var prevItem = previouslyClickedItem;
var isStrgPressed = KeyboardHelper.IsKeyPressed(ModifierKeys.Control);
var isShiftPressed = KeyboardHelper.IsKeyPressed(ModifierKeys.Shift);
var isAltPressed = KeyboardHelper.IsKeyPressed(ModifierKeys.Alt);
if (isAltPressed)
{
return;
}
if (isStrgPressed)
{
if (curItem.IsSelected)
{
SelectedItemIDs.Remove(curItem.Item.ItemId);
}
else
{
SelectedItemIDs.Add(curItem.Item.ItemId);
}
}
else if (isShiftPressed)
{
var section = this.Items.Subsection(curItem, prevItem);
if (section.All(item => item.IsSelected))
{
SelectedItemIDs.RemoveMany(section.Select(item => item.Item.ItemId));
}
else
{
SelectedItemIDs.AddRange(section.Select(item => item.Item.ItemId).Except(this.SelectedItemIDs.Items));
}
}
else
{
if (SelectedItemIDs.Count == 1 && SelectedItemIDs.Items.Contains(curItem.Item.ItemId))
{
return;
}
this.SelectedItemIDs.Clear();
SelectedItemIDs.Add(curItem.Item.ItemId);
}
previouslyClickedItem = curItem;
}
public ItemListViewModel(
IItemService itemService,
IInjectionProviderService injectionProviderService)
{
this._itemService = itemService ?? throw new NullReferenceException("got no itemService");
this._injectionProviderService = injectionProviderService ?? throw new NullReferenceException("got no itemservice");
this.DeselectAllCommand = new RelayCommand(
_ => this.SelectedItemIDs.Clear(),
_ => this.SelectedItemIDs.Items.Any());
this.ItemClickedCommand = new RelayCommand(onItemClicked);
this.ListKeyUpCommand = new RelayCommand(onListKeyUp);
DragCommand = new RelayCommand(sender =>
{
if (KeyboardHelper.IsKeyPressed(ModifierKeys.Alt))
{
itemDrag(sender as DependencyObject);
}
});
this._injectionProviderService.Provider.Subscribe(
(provider) =>
{
if (provider == null)
{
throw new InvalidOperationException("provider is null");
}
#region list assembly
var itemList = this._itemService
.GetExtended()
.Connect()
.Filter(FilterChanges)
.TakeUntil(destroy);
var selectionList =
itemList.Transform(item => new ItemSelectionInfo(item, this, DragCommand))
.DisposeMany();
var _selection =
SelectedItemIDs.Connect()
.AddKey(id => id)
.LeftJoin(
itemList,
item => item.ItemId,
(id, item) => new { id, item })
.RemoveKey();
Selection =
_selection
.Filter(x => x.item.HasValue)
.Transform(x => x.item.Value)
.AsObservableList();
_selection
.Filter(x => !x.item.HasValue)
.ToCollection()
.Subscribe(col =>
{
if (col.Any())
{
SelectedItemIDs.RemoveMany(col.Select(x => x.id));
}
});
selectionList
.Sort(item => item.Item.Name)
.ObserveOn(RxApp.MainThreadScheduler)
.Do(_ => this.Disconnected = true)
.Bind(out _items)
.Do(_ => this.Disconnected = false)
.Subscribe();
#endregion
});
}
