fix [#27193] view/camera/set active object as camera sometimes "disabled" in gui (grayed out)

When in quad split view, operators that only apply to the unlocked region can now be accessed from menus and when the mouse is over a locked view.

Applied to:
- VIEW3D_OT_object_as_camera
- VIEW3D_OT_view_persportho
- VIEW3D_OT_view_orbit
- VIEW3D_OT_viewnumpad

1 files changed, 38 insertions, 0 deletions

diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index a8cdc99645d..93d86f2d97b 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -156,6 +156,44 @@ RegionView3D *ED_view3d_context_rv3d(bContext *C)
 	return rv3d;
 }
 
+/* ideally would return an rv3d but in some cases the region is needed too
+ * so return that, the caller can then access the ar->regiondata */
+ARegion *ED_view3d_context_region_unlock(bContext *C)
+{
+	ScrArea *sa= CTX_wm_area(C);
+	if(sa && sa->spacetype==SPACE_VIEW3D) {
+		ARegion *ar= CTX_wm_region(C);
+		if(ar) {
+			RegionView3D *rv3d= ar->regiondata;
+			if(rv3d && rv3d->viewlock == 0) {
+				return ar;
+			}
+			else {
+				ARegion *ar_unlock_user= NULL;
+				ARegion *ar_unlock= NULL;
+				for(ar= sa->regionbase.first; ar; ar= ar->next) {
+					/* find the first unlocked rv3d */
+					if(ar->regiondata && ar->regiontype == RGN_TYPE_WINDOW) {
+						rv3d= ar->regiondata;
+						if(rv3d->viewlock == 0) {
+							ar_unlock= ar;
+							if(rv3d->persp==RV3D_PERSP || rv3d->persp==RV3D_CAMOB) {
+								ar_unlock_user= ar;
+								break;
+							}
+						} 
+					}
+				}
+
+				/* camera/perspective view get priority when the active region is locked */
+				if(ar_unlock_user) return ar_unlock_user;
+				if(ar_unlock) return ar_unlock;
+			}
+		}
+	}
+	return NULL;
+}
+
 /* Most of the time this isn't needed since you could assume the view matrix was
  * set while drawing, however when functions like mesh_foreachScreenVert are
  * called by selection tools, we can't be sure this object was the last.