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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
//
// Media sources
//
public abstract class ThumbnailSource : DataSource {
public virtual signal void thumbnail_altered() {
}
protected ThumbnailSource(int64 object_id = INVALID_OBJECT_ID) {
base (object_id);
}
public virtual void notify_thumbnail_altered() {
// fire signal on self
thumbnail_altered();
// signal reflection to DataViews
contact_subscribers(subscriber_thumbnail_altered);
}
private void subscriber_thumbnail_altered(DataView view) {
((ThumbnailView) view).notify_thumbnail_altered();
}
public abstract Gdk.Pixbuf? get_thumbnail(int scale) throws Error;
// get_thumbnail( ) may return a cached pixbuf; create_thumbnail( ) is guaranteed to create
// a new pixbuf (e.g., by the source loading, decoding, and scaling image data)
public abstract Gdk.Pixbuf? create_thumbnail(int scale) throws Error;
// A ThumbnailSource may use another ThumbnailSource as its representative. It's up to the
// subclass to forward on the appropriate methods to this ThumbnailSource. But, since multiple
// ThumbnailSources may be referring to a single ThumbnailSource, this allows for that to be
// detected and optimized (in caching).
//
// Note that it's the responsibility of this ThumbnailSource to fire "thumbnail-altered" if its
// representative does the same.
//
// Default behavior is to return the ID of this.
public virtual string get_representative_id() {
return get_source_id();
}
public abstract PhotoFileFormat get_preferred_thumbnail_format();
}
public abstract class PhotoSource : MediaSource {
protected PhotoSource(int64 object_id = INVALID_OBJECT_ID) {
base (object_id);
}
public abstract PhotoMetadata? get_metadata();
public abstract Gdk.Pixbuf get_pixbuf(Scaling scaling) throws Error;
}
public abstract class VideoSource : MediaSource {
}
//
// EventSource
//
public abstract class EventSource : ThumbnailSource {
protected EventSource(int64 object_id = INVALID_OBJECT_ID) {
base (object_id);
}
public abstract time_t get_start_time();
public abstract time_t get_end_time();
public abstract uint64 get_total_filesize();
public abstract int get_media_count();
public abstract Gee.Collection<MediaSource> get_media();
public abstract string? get_comment();
public abstract bool set_comment(string? comment);
}
//
// ContainerSource
//
public interface ContainerSource : DataSource {
public abstract bool has_links();
public abstract SourceBacklink get_backlink();
public abstract void break_link(DataSource source);
public abstract void break_link_many(Gee.Collection<DataSource> sources);
public abstract void establish_link(DataSource source);
public abstract void establish_link_many(Gee.Collection<DataSource> sources);
}
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