/// <summary>
/// Updates the GUI data for a filter values selection screen which reflects the available filter values for
/// the current base view specification of our <see cref="AbstractScreenData._navigationData"/>.
/// </summary>
protected async Task ReloadFilterValuesList(bool createNewList)
{
MediaLibraryQueryViewSpecification currentVS = _navigationData.BaseViewSpecification as MediaLibraryQueryViewSpecification;
if (currentVS == null)
{ // Should never happen
ServiceRegistration.Get <ILogger>().Error("FilterScreenData: Wrong type of media library view '{0}'", _navigationData.BaseViewSpecification);
return;
}
// Control other threads reentering this method
lock (_syncObj)
{
if (_buildingList)
{ // Another thread is already building the items list - mark it as dirty and let the other thread
// rebuild it.
_listDirty = true;
return;
}
// Mark the list as being built
_buildingList = true;
_listDirty = false;
}
try
{
ItemsList items;
if (createNewList)
{
items = new ItemsList();
}
else
{
items = _items;
items.Clear();
}
try
{
Display_ListBeingBuilt();
IFilter filter = currentVS.FilterTree.BuildFilter(_filterPath);
ICollection <Guid> necessaryMIAs = _necessaryFilteredMIATypeIds ?? currentVS.NecessaryMIATypeIds;
// If the number of values to create exceeds MAX_NUM_ITEMS_VISIBLE we need to try and group the items.
// We request all values first, rather than groups, on the assumption that most of the time the limit
// shouldn't be reached given that we are filtering the values.
bool grouping = false;
ICollection <FilterValue> fv = await _filterCriterion.GetAvailableValuesAsync(necessaryMIAs, _clusterFilter, filter).ConfigureAwait(false);
if (fv.Count > Consts.MAX_NUM_ITEMS_VISIBLE && _clusterFilter == null)
{
ICollection <FilterValue> groupValues = await _filterCriterion.GroupValuesAsync(necessaryMIAs, _clusterFilter, filter).ConfigureAwait(false);
if (groupValues != null && groupValues.Count > 0)
{
fv = groupValues;
grouping = true;
}
}
if (fv.Count > Consts.MAX_NUM_ITEMS_VISIBLE)
{
Display_TooManyItems(fv.Count);
}
else
{
bool dirty;
lock (_syncObj)
dirty = _listDirty;
if (dirty)
{
UpdateOrRebuildView(items, createNewList);
return;
}
_sortable = true;
int totalNumItems = 0;
List <FilterItem> itemsList = new List <FilterItem>();
// Build collection of available (filter/display) screens which will remain in the next view - that is all currently
// available screens without the screen which equals this current screen. But we cannot simply remove "this"
// from the collection, because "this" could be a derived screen (in case our base screen showed groups).
// So we need an equality criterion when the screen to be removed is equal to this screen in terms of its
// filter criterion. But with the given data, we actually cannot derive that equality.
// So we simply use the MenuItemLabel, which should be the same in this and the base screen of the same filter.
foreach (FilterValue f in fv)
{
//Used for enclosure
FilterValue filterValue = f;
_sortable &= filterValue.Item != null;
string filterTitle = filterValue.Title;
IFilter selectAttributeFilter = filterValue.SelectAttributeFilter;
MediaLibraryQueryViewSpecification subVS = currentVS.CreateSubViewSpecification(filterTitle,
FilterTreePath.Combine(_filterPath, filterValue.RelativeFilterPath), filterValue.Filter, filterValue.LinkedId);
T filterValueItem = new T
{
// Support non-playable MediaItems (i.e. Series, Seasons)
MediaItem = filterValue.Item,
SimpleTitle = filterTitle,
NumItems = filterValue.NumItems,
Id = filterValue.Id,
Command = new MethodDelegateCommand(() =>
{
if (grouping)
{
NavigateToGroup(subVS, selectAttributeFilter);
}
else
{
NavigateToSubView(subVS);
}
}),
View = subVS.BuildView()
};
itemsList.Add(filterValueItem);
if (filterValue.NumItems.HasValue)
{
totalNumItems += filterValue.NumItems.Value;
}
}
if (_sortable)
{
Sorting.Sorting sorting = CurrentSorting;
if (sorting != null)
{
itemsList.Sort((i1, i2) => sorting.Compare(i1.MediaItem, i2.MediaItem));
}
}
// Derived classes can implement special initial selection handling here,
// e.g. the first unwatched episode could be selected from a list of episodes
SetSelectedItem(itemsList);
CollectionUtils.AddAll(items, itemsList);
Display_Normal(items.Count, totalNumItems == 0 ? new int?() : totalNumItems);
}
}
catch (Exception e)
{
ServiceRegistration.Get <ILogger>().Warn("AbstractFiltersScreenData: Error creating filter values list", e);
Display_ItemsInvalid();
}
UpdateOrRebuildView(items, createNewList);
}
finally
{
lock (_syncObj)
_buildingList = false;
}
}
/// <summary>
/// Updates the GUI data for a filter values selection screen which reflects the available filter values for
/// the current base view specification of our <see cref="AbstractScreenData._navigationData"/>.
/// </summary>
protected void ReloadFilterValuesList(bool createNewList)
{
MediaLibraryQueryViewSpecification currentVS = _navigationData.BaseViewSpecification as MediaLibraryQueryViewSpecification;
if (currentVS == null)
{ // Should never happen
ServiceRegistration.Get <ILogger>().Error("FilterScreenData: Wrong type of media library view '{0}'", _navigationData.BaseViewSpecification);
return;
}
// Control other threads reentering this method
lock (_syncObj)
{
if (_buildingList)
{ // Another thread is already building the items list - mark it as dirty and let the other thread
// rebuild it.
_listDirty = true;
return;
}
// Mark the list as being built
_buildingList = true;
_listDirty = false;
}
try
{
ItemsList items;
if (createNewList)
{
items = new ItemsList();
}
else
{
items = _items;
items.Clear();
}
try
{
Display_ListBeingBuilt();
bool grouping = true;
ICollection <FilterValue> fv = _clusterFilter == null?
_filterCriterion.GroupValues(currentVS.NecessaryMIATypeIds, _clusterFilter, currentVS.Filter) : null;
if (fv == null || fv.Count <= Consts.MAX_NUM_ITEMS_VISIBLE)
{
fv = _filterCriterion.GetAvailableValues(currentVS.NecessaryMIATypeIds, _clusterFilter, currentVS.Filter);
grouping = false;
}
if (fv.Count > Consts.MAX_NUM_ITEMS_VISIBLE)
{
Display_TooManyItems(fv.Count);
}
else
{
lock (_syncObj)
if (_listDirty)
{
goto RebuildView;
}
int totalNumItems = 0;
// Build collection of available (filter/display) screens which will remain in the next view - that is all currently
// available screens without the screen which equals this current screen. But we cannot simply remove "this"
// from the collection, because "this" could be a derived screen (in case our base screen showed groups).
// So we need an equality criterion when the screen to be removed is equal to this screen in terms of its
// filter criterion. But with the given data, we actually cannot derive that equality.
// So we simply use the MenuItemLabel, which should be the same in this and the base screen of the same filter.
foreach (FilterValue filterValue in fv)
{
string filterTitle = filterValue.Title;
IFilter selectAttributeFilter = filterValue.SelectAttributeFilter;
MediaLibraryQueryViewSpecification subVS = currentVS.CreateSubViewSpecification(filterTitle, filterValue.Filter);
T filterValueItem = new T
{
SimpleTitle = filterTitle,
NumItems = filterValue.NumItems,
Command = grouping ?
new MethodDelegateCommand(() => NavigateToGroup(subVS, selectAttributeFilter)) :
new MethodDelegateCommand(() => NavigateToSubView(subVS))
};
items.Add(filterValueItem);
if (filterValue.NumItems.HasValue)
{
totalNumItems += filterValue.NumItems.Value;
}
}
Display_Normal(items.Count, totalNumItems == 0 ? new int?() : totalNumItems);
}
}
catch (Exception e)
{
ServiceRegistration.Get <ILogger>().Warn("AbstractFiltersScreenData: Error creating filter values list", e);
Display_ItemsInvalid();
}
RebuildView:
if (_listDirty)
{
lock (_syncObj)
_buildingList = false;
ReloadFilterValuesList(createNewList);
}
else
{
_items = items;
_items.FireChange();
}
}
finally
{
lock (_syncObj)
_buildingList = false;
}
}
/// <summary>
/// Updates the GUI data for a filter values selection screen which reflects the available filter values for
/// the current base view specification of our <see cref="AbstractScreenData._navigationData"/>.
/// </summary>
protected void ReloadFilterValuesList(bool createNewList)
{
MediaLibraryQueryViewSpecification currentVS = _navigationData.BaseViewSpecification as MediaLibraryQueryViewSpecification;
if (currentVS == null)
{ // Should never happen
ServiceRegistration.Get <ILogger>().Error("FilterScreenData: Wrong type of media library view '{0}'", _navigationData.BaseViewSpecification);
return;
}
// Control other threads reentering this method
lock (_syncObj)
{
if (_buildingList)
{ // Another thread is already building the items list - mark it as dirty and let the other thread
// rebuild it.
_listDirty = true;
return;
}
// Mark the list as being built
_buildingList = true;
_listDirty = false;
}
try
{
ItemsList items;
if (createNewList)
{
items = new ItemsList();
}
else
{
items = _items;
items.Clear();
}
try
{
Display_ListBeingBuilt();
bool grouping = true;
//If currentVS is the base view it's possible that it has a filter that is incompatible with _filterCriterion.
//This is the case if a plugin has added a base filter to exclude certain items, e.g. TV excludes recordings
//and the new filter filters by a different media type, e.g. series'. Ignore the base filter in this case.
IFilter currentFilter = (_navigationData.Parent != null && CanFilter(_navigationData.Parent.CurrentScreenData)) ||
currentVS.CanCombineFilters(_filteredMias) ? currentVS.Filter : null;
ICollection <FilterValue> fv = _clusterFilter == null?
_filterCriterion.GroupValues(currentVS.NecessaryMIATypeIds, _clusterFilter, currentFilter) : null;
if (fv == null || fv.Count <= Consts.MAX_NUM_ITEMS_VISIBLE)
{
fv = _filterCriterion.GetAvailableValues(currentVS.NecessaryMIATypeIds, _clusterFilter, currentFilter);
grouping = false;
}
if (fv.Count > Consts.MAX_NUM_ITEMS_VISIBLE)
{
Display_TooManyItems(fv.Count);
}
else
{
bool dirty;
lock (_syncObj)
dirty = _listDirty;
if (dirty)
{
UpdateOrRebuildView(items, createNewList);
return;
}
_sortable = true;
int totalNumItems = 0;
List <FilterItem> itemsList = new List <FilterItem>();
// Build collection of available (filter/display) screens which will remain in the next view - that is all currently
// available screens without the screen which equals this current screen. But we cannot simply remove "this"
// from the collection, because "this" could be a derived screen (in case our base screen showed groups).
// So we need an equality criterion when the screen to be removed is equal to this screen in terms of its
// filter criterion. But with the given data, we actually cannot derive that equality.
// So we simply use the MenuItemLabel, which should be the same in this and the base screen of the same filter.
foreach (FilterValue filterValue in fv)
{
_sortable &= filterValue.Item != null;
string filterTitle = filterValue.Title;
IFilter selectAttributeFilter = filterValue.SelectAttributeFilter;
MediaLibraryQueryViewSpecification subVS = currentVS.CreateSubViewSpecification(filterTitle, filterValue.Filter, _filteredMias);
T filterValueItem = new T
{
// Support non-playable MediaItems (i.e. Series, Seasons)
MediaItem = filterValue.Item,
SimpleTitle = filterTitle,
NumItems = filterValue.NumItems,
Id = filterValue.Id,
Command = grouping ?
new MethodDelegateCommand(() => NavigateToGroup(subVS, selectAttributeFilter)) :
new MethodDelegateCommand(() => NavigateToSubView(subVS))
};
itemsList.Add(filterValueItem);
if (filterValue.NumItems.HasValue)
{
totalNumItems += filterValue.NumItems.Value;
}
}
if (_sortable)
{
Sorting.Sorting sorting = CurrentSorting;
if (sorting != null)
{
itemsList.Sort((i1, i2) => sorting.Compare(i1.MediaItem, i2.MediaItem));
}
}
CollectionUtils.AddAll(items, itemsList);
Display_Normal(items.Count, totalNumItems == 0 ? new int?() : totalNumItems);
}
}
catch (Exception e)
{
ServiceRegistration.Get <ILogger>().Warn("AbstractFiltersScreenData: Error creating filter values list", e);
Display_ItemsInvalid();
}
UpdateOrRebuildView(items, createNewList);
}
finally
{
lock (_syncObj)
_buildingList = false;
}
}
