Objects: support for hiding all objects in a collection.

In the outliner there are now icons for it, Ctrl+Click isolates a
single collections.

In the 3D view, Ctrl+H key opens a menu that is more or less the
equivalent of the old layer buttons in the header. Regular Click isolates
the collection, Shift+Click toggle the collection visibility. Pressing
number keys and letters works in this menu, which can help for quickly
selecting a specific collection.

Shortcuts for quick switching by just pressing 1/2/3/.. keys are available
again. The order can be confusing with nested collections, but that seems
unavoidable. The first numbers control the top level collections, and then
sub collections if numbers are left.

Remaining design issues:

* The 3D view menu needs to be improved: support for sub collections,
  staying open on shift+click, access from the 3D view header somewhere,
  shortcut key display.
* Currently collection hiding just controls per-object hiding, we plan
  to separate this state still so alt+H doesn't affect collection hiding.

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_layer.h b/source/blender/blenkernel/BKE_layer.h
index 60204d177f2..9e89033894d 100644
--- a/source/blender/blenkernel/BKE_layer.h
+++ b/source/blender/blenkernel/BKE_layer.h
@@ -104,8 +104,15 @@ bool BKE_view_layer_has_collection(
 bool BKE_scene_has_object(
         struct Scene *scene, struct Object *ob);
 
+/* selection and hiding */
+
 bool BKE_layer_collection_objects_select(
         struct ViewLayer *view_layer, struct LayerCollection *lc, bool deselect);
+bool BKE_layer_collection_has_selected_objects(
+        struct ViewLayer *view_layer, struct LayerCollection *lc);
+
+void BKE_base_set_visible(struct Scene *scene, struct ViewLayer *view_layer, struct Base *base, bool extend);
+void BKE_layer_collection_set_visible(struct Scene *scene, struct ViewLayer *view_layer, struct LayerCollection *lc, bool extend);
 
 /* override */