在GTK +树形视图中显示异构数据

Question

I'm writing a music player frontend using Python bindings for GTK+. The playlist is a TreeStore, with albums represented by the top-level items, and tracks by their children.

I want to separate the scanning of the music directory and reading the tags of the music files, based on the hunch that scanning the tags is more time-consuming than just adding the item to the tree store. Hence, I intend to run a separate thread that goes over the playlist and fills in the tags. For that end, the model items will consist of the following columns:

[ 'file_path', 'tags_filled', 'album', 'title', (more items for tags) ]

When the music directory is initially traversed, only file_path will be filled, and tags_filled set to False . The tag-filler thread will set tags_filled to True and the rest of the columns to their values from the music file.

When it comes to displaying the described model, I want to display the rows differently based on the tags_filled attribute: When it's False , I want only the file path displayed, spanning the full widget width; and when it's True , I want only the tag values displayed in the separate columns.

Something like this:

| Artist | Album  | Date | Title                      | Duration |
|--------+--------+------+----------------------------+----------|
| AC/DC  | T.N.T. | 1975 | It's A Long Way To The Top | 5:15     |  <-- scanned
| music/AC-DC/1975 - T.N.T/02 - Rock'N'Roll Singer.MP3           |  <-- not yet scanned

Can you suggest how I can go over implementing this?

Answer 1

It is not possible to merge cells of a tree view (yet). You'd have to use a table (deprecated since Gtk 3.4) or a grid for this. Here's how to use these widgets for GTK 3 or check the PyGTK 2.0 Reference Manual, if you are using PyGTK.