Icon-O-Matic: Add reference images

Fixes #2748

Also fixes a comment misstating a function's name and code style.

Change-Id: I609a1f1e100ded647818e70b428cedc48cf29036
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6604
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

Icon-O-Matic: Make GradientTransformable a BReferenceable

* Switch to using support/Referenceable.h instead of using an older copy
of this code.
* Make GradientTransformable a BReferenceable and fix #12033.

* merged Icon-O-Matic from Ingos layout branch into trunk (r18134:18685)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18686 a95241bf-73f2-0310-859d-f6bbb57e9c96

many improvements and bug fixes:
* added VertexSource::SetLast() used by PathSource
to call agg::path_storage::close_polygon(). The
StrokeTransformer avoids this of course. Affine
and PerspectiveTransformer forward this to their source.
* TransformerItems watch their transformers for notifications
* made VectorPath an IconObject
* VectorPath no longer uses close_polygon() when converting
to agg::path_storage to allow open strokes
* added IconObjectListView which inherits from
PropertyListView and allows to edit the properties of the
last selected object from one of the other list views
* fixed a couple bugs when adopting properties:
- removed the Property* in the PropertyEditorView base
class, and made GetProperty() virtual, as the base class
pointer was not maintained and superfluous
- delete the old PropertyObject in PropertyListView::SetTo
when adopting the properties instead of the object whose
properties were adopted...
* added SetPropertiesCommand to allow Undo/Redo on changes
of properties
* Style is also an IconObject now (TODO: yet another list view
for styles... :-)
* Style watches its Gradient for notifications and builds and
caches the color array now
* removed generating the color array for each scanline in
IconRenderer, so the performance is improved a lot
* Shape watches its Transformers for notifications in order
to trigger rerendering
* StrokeTransformers adds a bunch of properties like stroke
width, cap and join mode
* StateView keyboard filter no longer steals keydown events
from BTextViews
* PropertyItemViews resize with the parent
* refined the interface for PropertyListView for easier
tracking of the changed properties in derived classes
* added HasPendingNotifications() to Observable, so that
IconObjects can track changes more easily when adopting
a PropertyObject
* the name is now part of any IconObject


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18045 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Style is now responsible for generating and caching
the gradient color array, it observs the gradient for
this purpose
* introduced IconObject class that combines Observable,
Referenceable and Selectable interfaces and adds an
interface for retrieving a PropertyObject that represents
the object in question
* Shape and Style inherit from IconObject now


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18037 a95241bf-73f2-0310-859d-f6bbb57e9c96

Icon-O-Matic: Make GradientTransformable a BReferenceable

* Switch to using support/Referenceable.h instead of using an older copy
of this code.
* Make GradientTransformable a BReferenceable and fix #12033.

* merged Icon-O-Matic from Ingos layout branch into trunk (r18134:18685)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18686 a95241bf-73f2-0310-859d-f6bbb57e9c96

many improvements and bug fixes:
* added VertexSource::SetLast() used by PathSource
to call agg::path_storage::close_polygon(). The
StrokeTransformer avoids this of course. Affine
and PerspectiveTransformer forward this to their source.
* TransformerItems watch their transformers for notifications
* made VectorPath an IconObject
* VectorPath no longer uses close_polygon() when converting
to agg::path_storage to allow open strokes
* added IconObjectListView which inherits from
PropertyListView and allows to edit the properties of the
last selected object from one of the other list views
* fixed a couple bugs when adopting properties:
- removed the Property* in the PropertyEditorView base
class, and made GetProperty() virtual, as the base class
pointer was not maintained and superfluous
- delete the old PropertyObject in PropertyListView::SetTo
when adopting the properties instead of the object whose
properties were adopted...
* added SetPropertiesCommand to allow Undo/Redo on changes
of properties
* Style is also an IconObject now (TODO: yet another list view
for styles... :-)
* Style watches its Gradient for notifications and builds and
caches the color array now
* removed generating the color array for each scanline in
IconRenderer, so the performance is improved a lot
* Shape watches its Transformers for notifications in order
to trigger rerendering
* StrokeTransformers adds a bunch of properties like stroke
width, cap and join mode
* StateView keyboard filter no longer steals keydown events
from BTextViews
* PropertyItemViews resize with the parent
* refined the interface for PropertyListView for easier
tracking of the changed properties in derived classes
* added HasPendingNotifications() to Observable, so that
IconObjects can track changes more easily when adopting
a PropertyObject
* the name is now part of any IconObject


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18045 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Style is now responsible for generating and caching
the gradient color array, it observs the gradient for
this purpose
* introduced IconObject class that combines Observable,
Referenceable and Selectable interfaces and adds an
interface for retrieving a PropertyObject that represents
the object in question
* Shape and Style inherit from IconObject now


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18037 a95241bf-73f2-0310-859d-f6bbb57e9c96