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Topic: Sorting playlist items in descending order (Read 1597 times) previous topic - next topic
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Sorting playlist items in descending order

Hi all,

I want to sort playlist items using API, playlist_manager::playlist_sort_by_format() works well, but I can't find proper way of doing this in descending order.

First I tried to do ascending sort and then reverse order of items, but this has unintentional effect of reordering items that are equal according to sorting title format expression. It other words it makes sorting unstable.

Now I'm doing the following trick: reverse order of items, apply sorting, reverse it again. This makes sorting stable, but looks kinda ugly.

Is there any better way?

Re: Sorting playlist items in descending order

Reply #1 –
Apparently there's no direction argument there.
However, the sorting can be accomplished by producing the reorder permutation on your end and applying it to the playlist, which - as far as the rest of the app is concerned - is the same as sorting the playlist using playlist_sort_by_format(). Also, lower level metadb_handle_list sorting methods do have the "direction" parameter so you can perform a reverse sort cleanly.

Code: [Select]
		// Direction, -1 to reverse
		int direction = 1;

		// Prepare sorter object
		titleformat_object::ptr script;
		if (!titleformat_compiler::get()->compile( script, "%title%" )) uBugCheck();

		metadb_handle_list items; pfc::array_t<size_t> order;
		auto api = playlist_manager::get();
		// Get whole playlist
		api->activeplaylist_get_all_items( items );
		// Prepare memory for reorder permutation content
		order.set_size_discard( items.get_count() );
		// Make our permutation
		// Low-level metadb_handle_list_helper method has the direction parameters
		metadb_handle_list_helper::sort_by_format_get_order( items, order.get_ptr(), script, nullptr, direction );
		// Create an undo snapshot
		api->activeplaylist_undo_backup();
		// Apply our permutation
		api->activeplaylist_reorder_items( order.get_ptr(), order.get_size() );
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