Custom Manipulators Core Backend

This commit lands the core backend of the Custom Manipulators project onto the blender2.8 branch. It is a generic backend for managinig interactive on-screen controls that can be integrated into any 2D or 3D edito. It's also already integrated into the window-manager and editor code where needed.

NOTE: The changes here should not be visible for users at all. It's really just a back-end patch. Neither does this include any RNA or Python integration.

Of course, there's still lots of work ahead for custom manipulators, but this is a big milestone. WIP code that actually uses this backend can be found in the 'custom-manipulators' branch (previously called 'wiggly-widgets').

The work here isn't completely my own, all the initial work was done by @Antony Riakiotakis (psy-fi) and - although it has changed a lot since them - it's still the same in essence. He definitely deserves a big credit! Some changes in this patch were also done by @Campbell Barton (campbellbarton). Thank you guys!

Merge accepted by @brecht and @merwin.
Patch: https://developer.blender.org/D2232
Code documentation: https://wiki.blender.org/index.php/Dev:2.8/Source/Custom_Manipulator
Main task: https://developer.blender.org/T47343
More info: https://code.blender.org/2015/09/the-custom-manipulator-project-widget-project/

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_screen.h b/source/blender/blenkernel/BKE_screen.h
index 14e978b23f2..010810ad0cc 100644
--- a/source/blender/blenkernel/BKE_screen.h
+++ b/source/blender/blenkernel/BKE_screen.h
@@ -49,6 +49,7 @@ struct bScreen;
 struct uiLayout;
 struct uiList;
 struct wmKeyConfig;
+struct wmManipulatorMap;
 struct wmNotifier;
 struct wmWindow;
 struct wmWindowManager;
@@ -96,6 +97,9 @@ typedef struct SpaceType {
 	/* on startup, define dropboxes for spacetype+regions */
 	void (*dropboxes)(void);
 
+	/* initialize manipulator-map-types and manipulator-group-types with the region */
+	void (*manipulators)(void);
+
 	/* return context data */
 	int (*context)(const struct bContext *, const char *, struct bContextDataResult *);
 
@@ -284,6 +288,8 @@ void BKE_spacedata_id_unref(struct ScrArea *sa, struct SpaceLink *sl, struct ID
 struct ARegion *BKE_area_region_copy(struct SpaceType *st, struct ARegion *ar);
 void            BKE_area_region_free(struct SpaceType *st, struct ARegion *ar);
 void            BKE_screen_area_free(struct ScrArea *sa);
+/* Manipulator-maps of a region need to be freed with the region. Uses callback to avoid low-level call. */
+void BKE_region_callback_free_manipulatormap_set(void (*callback)(struct wmManipulatorMap *));
 
 struct ARegion *BKE_area_find_region_type(struct ScrArea *sa, int type);
 struct ARegion *BKE_area_find_region_active_win(struct ScrArea *sa);