Since the time taken by g_file_enumerate_children() depends a lot on the
attributes that are queried, we query the minimum attributes that need
to be queired to display the file chooser.
In particular, the attributes for loading the icon are ignored, as icons
are loaded on demand (see previous commit).
Because loading icons takes a noticable performance, this code loads the
pixbuf on demand and only loads icons for rows that are visible. There
is a few caveats to this:
- The pixbuf cell renderer must report the proer size even if the icon
is not yet loaded. This is achieved by setting a fixed size.
- On theme changes the cahced pixbufs and the cell renderer must be
updated to conform to the new theme.
Previously, there was a GtkTreeSortModel wrapped around the filesystem
model to make it sortable. As the new implementation implements the
GtkTreeSortable interface, we can use this instead.
A lot of code special cases accesses to the tree view for the different
browse modes, which was previously necessary, because the models were
different. Now that they are identical in the first columns, there is no
such need anymore, and the functions don't need to be special cased.
Previously custom functions were used to compute the data passed to the
cell renderers. Now that all this data is saved by the tree models with
compatible nodes, the usual default attribute-to-column mapping can be
used.
With this, caching of the values can happen in the tree model, which
avoids costly lookups of icons or computation of strings. Last but not
least it avoids spurious bugs that could happen when strings changed
without anyone noticing, like the mtime when a new day begins.
All tree models in browse mode now share the first 10 column types
containing all the necessary information to display the model on screen.
Therefor it is now easy to just operate on the tree model associated
with the file tree view and in most cases it isn't necessary anymore to
special case the browse modes.
The new model is mostly API-compatible with the old model (minimal
changes were required), but is a lot faster and has a lot of very
desirable features.
- the model does no longer support a tree, just a list of files in a
given directory
- the storage has been moved to a GArray as opposed to a tree
- no more dependency on GtkFileSystem
- columns are managed by the creator of the model, so any number of
nodes can be added as needed. This also makes the API more similar
to GtkListStore.
- Values are filled on demand using a function given when creating the
model.
- The function can decide to let the model cache returned values or
decide to be called again the next time the value is queried.
- implements GtkTreeSortable
- _gtk_file_system_model_get_value() was added to significantly speed
up value access, which is necessary when sorting large models.
Add API for GtkDialog to return widgets by response ID.
Added gtk_dialog_get_widget_for_response() to access to all kinds
of buttons with all kinds of responses.
