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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.
*/
public class DataView : DataObject {
private DataSource source;
private bool selected = false;
private bool visible = true;
// Indicates that the selection state has changed.
public virtual signal void state_changed(bool selected) {
}
// Indicates the visible state has changed.
public virtual signal void visibility_changed(bool visible) {
}
// Indicates that the display (what is seen by the user) of the DataView has changed.
public virtual signal void view_altered() {
}
// Indicates that the geometry of the DataView has changed (which implies the view has altered,
// but only in that the same elements have changed size).
public virtual signal void geometry_altered() {
}
public virtual signal void unsubscribed(DataSource source) {
}
public DataView(DataSource source) {
this.source = source;
// subscribe to the DataSource, which sets up signal reflection and gives the DataView
// first notification of destruction.
source.internal_subscribe(this);
}
~DataView() {
#if TRACE_DTORS
debug("DTOR: DataView %s", dbg_to_string);
#endif
source.internal_unsubscribe(this);
}
public override string get_name() {
return "View of %s".printf(source.get_name());
}
public override string to_string() {
return "DataView %s [DataSource %s]".printf(get_name(), source.to_string());
}
public DataSource get_source() {
return source;
}
public bool is_selected() {
return selected;
}
// This method is only called by ViewCollection.
public void internal_set_selected(bool selected) {
if (this.selected == selected)
return;
this.selected = selected;
state_changed(selected);
}
// This method is only called by ViewCollection. Returns the toggled state.
public bool internal_toggle() {
selected = !selected;
state_changed(selected);
return selected;
}
public bool is_visible() {
return visible;
}
// This method is only called by ViewCollection.
public void internal_set_visible(bool visible) {
if (this.visible == visible)
return;
this.visible = visible;
visibility_changed(visible);
}
protected virtual void notify_view_altered() {
// impossible when not visible
if (!visible)
return;
ViewCollection vc = get_membership() as ViewCollection;
if (vc != null) {
if (!vc.are_notifications_frozen())
view_altered();
// notify ViewCollection in any event
vc.internal_notify_view_altered(this);
} else {
view_altered();
}
}
protected virtual void notify_geometry_altered() {
// impossible when not visible
if (!visible)
return;
ViewCollection vc = get_membership() as ViewCollection;
if (vc != null) {
if (!vc.are_notifications_frozen())
geometry_altered();
// notify ViewCollection in any event
vc.internal_notify_geometry_altered(this);
} else {
geometry_altered();
}
}
// This is only called by DataSource
public virtual void notify_unsubscribed(DataSource source) {
unsubscribed(source);
}
}
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