Outliner visibility unification: Implement 3 levels of viewport visibility

Now collection and objects can be either:
* Disabled for all the view layers.
* Hidden for a view layer but not necessarily for all others.
* Visible for a view layer but not necessarily for all others.

Regarding icons: Whatever we decide to use for the "Hidden for all view
layers" needs to be a toggle-like icon. Because when viewing "Scenes"
instead of "View Layer" in the outliner we should be able to edit the
collection "Hidden for all the view layers" as an on/off option.

The operators are accessible via a Visibility context menu or shortcuts:
* Ctrl + Click: Isolate collection (use shift to extend).
* Alt + Click: Disable collection.
* Shift + Click: Hide/Show collection and its children (objects and collections)

Things yet to be tackled:
* Object outliner context menu can also get a Visibility sub-menu.
* Get better icons for viewport enable/disable.

Note:
* When using emulate 3 button mouse alt+click is used for 2d panning.
  In this case users have to use the operator from the menu.

See T57857 for discussion.

Patch: https://developer.blender.org/D4011
Reviewers: brecht and sergey

Thanks to the reviewers and William Reynish and Julien Kasper in
particular for the feedback.

1 files changed, 11 insertions, 2 deletions

diff --git a/source/blender/editors/space_outliner/outliner_intern.h b/source/blender/editors/space_outliner/outliner_intern.h
index 96399d3c129..d978acb6062 100644
--- a/source/blender/editors/space_outliner/outliner_intern.h
+++ b/source/blender/editors/space_outliner/outliner_intern.h
@@ -123,12 +123,11 @@ typedef enum {
 /* size constants */
 #define OL_Y_OFFSET 2
 
-#define OL_TOG_HIDEX            (UI_UNIT_X * 4.0f + V2D_SCROLL_WIDTH)
 #define OL_TOG_RESTRICT_SELECTX (UI_UNIT_X * 3.0f + V2D_SCROLL_WIDTH)
 #define OL_TOG_RESTRICT_VIEWX   (UI_UNIT_X * 2.0f + V2D_SCROLL_WIDTH)
 #define OL_TOG_RESTRICT_RENDERX (UI_UNIT_X + V2D_SCROLL_WIDTH)
 
-#define OL_TOGW OL_TOG_HIDEX
+#define OL_TOGW OL_TOG_RESTRICT_SELECTX
 
 #define OL_RNA_COLX         (UI_UNIT_X * 15)
 #define OL_RNA_COL_SIZEX    (UI_UNIT_X * 7.5f)
@@ -329,6 +328,16 @@ void OUTLINER_OT_collection_holdout_clear(struct wmOperatorType *ot);
 void OUTLINER_OT_collection_indirect_only_set(struct wmOperatorType *ot);
 void OUTLINER_OT_collection_indirect_only_clear(struct wmOperatorType *ot);
 
+void OUTLINER_OT_collection_isolate(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_show(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_hide(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_show_inside(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_hide_inside(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_enable(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_disable(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_enable_render(struct wmOperatorType *ot);
+void OUTLINER_OT_collection_disable_render(struct wmOperatorType *ot);
+
 /* outliner_utils.c ---------------------------------------------- */
 
 TreeElement *outliner_find_item_at_y(const SpaceOops *soops, const ListBase *tree, float view_co_y);