internal SourceItemCollections(
IViewModel selectionVM,
Func <TItemSource, bool> isActiveFilter
)
{
IEnumerable <TItemSource> allItems = SelectionHelpers
.GetAllSourceItems <TItemSource>(selectionVM);
IEnumerable <TItemSource> selectedItems = SelectionHelpers
.GetSelectedSourceItems <TItemSource>(selectionVM);
AllSourceItems = new HashSet <TItemSource>(allItems);
IEnumerable <TItemSource> selectableItems = allItems;
if (isActiveFilter != null)
{
selectableItems = selectableItems.Where(isActiveFilter);
}
if (selectedItems != null && selectedItems.Any())
{
// Add items that are either inactive but currently selected or do
// are not contained in the all items at all.
selectableItems = selectableItems.Union(selectedItems);
}
SelectableItems = selectableItems.ToList();
}
public SelectableItemsCollection <TItemSource> GetSelectableItems(IBehaviorContext context)
{
SelectableItemsCollection <TItemSource> items;
if (!context.FieldValues.TryGetValue(_items, out items))
{
var source = ((IHasSourceObject <TSourceObject>)context.VM).Source;
Func <TItemSource, bool> reducedFilter = null;
if (IsActiveFilter != null)
{
reducedFilter = item => IsActiveFilter(source, item);
}
items = new SelectableItemsCollection <TItemSource>(
SelectionHelpers.GetAllSourceItems <TItemSource>(context.VM),
SelectionHelpers.GetSelectedSourceItems <TItemSource>(context.VM),
reducedFilter
);
context.FieldValues.SetValue(_items, items);
}
return(items);
}
public static void OnlyExistingItemsAreSelected <TOwner, TTarget, TSource, TVM>(
this ValidatorBuilder <
TOwner,
TTarget,
SingleSelectionVMDescriptor <TSource, TVM>
> builder,
string errorMessage = null,
object details = null
)
where TTarget : IViewModel <SingleSelectionVMDescriptor <TSource, TVM> >
where TOwner : IViewModel
where TVM : IViewModel, IHasSourceObject <TSource>
{
errorMessage = errorMessage ?? Localized.SelectedItemsNotInSourceItems;
builder.Check(x => x.SelectedItem).Custom(args => {
var selectionVM = args.Target;
if (args.Value != null)
{
if (!SelectionHelpers.IsItemContainedInAllSourceItems(selectionVM, args.Value.Source))
{
args.AddError(errorMessage, details);
}
}
});
}
public static void OnlyExistingItemsAreSelected <TOwner, TTarget, TSource, TVM>(
this ValidatorBuilder <
TOwner,
TTarget,
MultiSelectionVMDescriptor <TSource, TVM>
> builder,
string errorMessage = null,
object details = null
)
where TTarget : IViewModel <MultiSelectionVMDescriptor <TSource, TVM> >
where TOwner : IViewModel
where TVM : IViewModel, IHasSourceObject <TSource>
{
errorMessage = errorMessage ?? Localized.SelectedItemsNotInSourceItems;
builder.CheckCollection(x => x.SelectedItems).Custom(args => {
var selectionVM = args.Items.OwnerVM;
foreach (TVM selectedItem in args.Items)
{
if (!SelectionHelpers.IsItemContainedInAllSourceItems(selectionVM, selectedItem.Source))
{
args.AddError(selectedItem, errorMessage, details);
}
}
});
}
public SingleSelectionDescriptorBuilderBase(
IVMDescriptor itemDescriptor,
Func <TSourceObject, TItemSource, bool> isActiveFilter
)
{
WithProperties((d, b) => {
var v = b.GetPropertyBuilder();
d.SelectedItem = v.VM.DelegatesTo(
(vm) => vm.GetSelectedItem(),
(vm, val) => vm.SetSelectedItem(val)
);
d.AllItems = v
.Collection
.PopulatedWith(vm => {
IEnumerable <TItemSource> selectableItems = SelectionHelpers
.GetSelectableSourceItems <TSourceObject, TItemSource>(vm);
return(selectableItems.Select(x => vm.GetItemVM(x)));
})
.With(itemDescriptor);
});
WithViewModelBehaviors(b => {
b.OverrideUpdateFromSourceProperties(
x => x.AllSourceItems,
x => x.SelectedSourceItem,
x => x.AllItems,
x => x.SelectedItem
);
b.OverrideUpdateSourceProperties(
x => x.SelectedSourceItem
);
b.AppendBehavior(
new SelectionItemViewModelCacheBehavior <TItemSource, TItemVM>(itemDescriptor)
);
b.PrependBehavior(new ItemProviderBehavior <TSourceObject, TItemSource>()
{
IsActiveFilter = isActiveFilter
});
});
WithBehaviors(b => {
b.Property(x => x.AllSourceItems).IsCached();
b.Property(x => x.SelectedItem).PrependBehavior(new SelectedItemRefreshBehavior <TItemVM>());
// TODO: Make this configurable.
b.Property(x => x.SelectedSourceItem).RequiresLoadedProperty(x => x.AllSourceItems);
});
WithValidators(b => {
b.EnableParentValidation(x => x.SelectedItem);
});
}
private void DiscardUnusedEntries(IBehaviorContext context)
{
var activeSourceItems = new HashSet <TItemSource>(
SelectionHelpers.GetAllSourceItems <TItemSource>(context.VM)
);
Dictionary <TItemSource, TItemVM> cache = GetCache(context);
foreach (TItemSource entrySource in cache.Keys.ToArray())
{
if (!activeSourceItems.Contains(entrySource))
{
cache.Remove(entrySource);
}
}
}
public MultiSelectionDescriptorBuilderBase(
IVMDescriptor itemDescriptor,
Func <TSourceObject, TItemSource, bool> isActiveFilter
)
{
WithProperties((d, b) => {
var v = b.GetPropertyBuilder();
d.SelectedItems = v
.Collection
.Wraps(x => x.SelectedSourceItems)
.With <TItemVM>(itemDescriptor);
d.AllItems = v
.Collection
.PopulatedWith(vm => {
IEnumerable <TItemSource> selectableItems = SelectionHelpers
.GetSelectableSourceItems <TSourceObject, TItemSource>(vm);
return(selectableItems.Select(x => vm.GetItemVM(x)));
})
.With(itemDescriptor);
});
WithViewModelBehaviors(b => {
b.OverrideUpdateFromSourceProperties(
x => x.AllSourceItems,
x => x.SelectedSourceItems,
x => x.AllItems,
x => x.SelectedItems
);
b.OverrideUpdateSourceProperties(
x => x.SelectedSourceItems
);
b.AppendBehavior(
new SelectionItemViewModelCacheBehavior <TItemSource, TItemVM>(itemDescriptor)
);
b.AppendBehavior(new ItemProviderBehavior <TSourceObject, TItemSource>()
{
IsActiveFilter = isActiveFilter
});
});
WithBehaviors(b => {
b.Property(x => x.SelectedItems).Enable(
PropertyBehaviorKeys.ValueAccessor,
new SelectedItemsAccessorBehavior <TVM, TItemVM, TItemSource>()
);
// This behavior allows a bound comobox to assign a new list to the 'SelectedItems'
// property every time the selection changes.
b.Property(x => x.SelectedItems).Enable(
PropertyBehaviorKeys.DisplayValueAccessor,
new SettableListDisplayValueBehavior <TItemVM>()
);
b.Property(x => x.SelectedItems).AddChangeHandler((vm, args) => {
vm.RaisePropertyChangedForSelectedItems(); // HACK!
});
b.Property(x => x.AllSourceItems).IsCached();
b.Property(x => x.SelectedItems).SupportsDisplayValueConversion();
b.Property(x => x.SelectedItems).PrependBehavior(new SelectedItemsRefreshBehavior <TItemVM>());
// TODO: Make this configurable.
b.Property(x => x.SelectedSourceItems).RequiresLoadedProperty(x => x.AllSourceItems);
});
WithValidators(b => {
b.EnableParentValidation(x => x.SelectedItems);
b.EnableParentViewModelValidation();
});
}
