UI: Properties editor popover and outliner sync

This adds a popover to the properties editor. Currently the only setting
is for controlling outliner to properties syncing.

Because we cannot define a perfect heuristic to determine when
properties editors should change tabs based on outliner icon selection,
we need an option to enable or disable this behavior per properties
editor.

There are 3 options for controlling the syncing. Auto uses the heuristic
to only allow tab switching when a properties editor and outliner share
a border. On and off enable and disable syncing respectively.

Differential Revision: https://developer.blender.org/D9758

1 files changed, 11 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 4276e8b568e..f27a89a3d83 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -152,9 +152,12 @@ typedef struct SpaceProperties {
   short mainb, mainbo, mainbuser;
   /** Preview is signal to refresh. */
   short preview;
-  char _pad[5];
+  char _pad[4];
   char flag;
 
+  /* eSpaceButtons_OutlinerSync */
+  char outliner_sync;
+
   /** Runtime. */
   void *path;
   /** Runtime. */
@@ -232,6 +235,13 @@ typedef enum eSpaceButtons_Flag {
   SB_SHADING_CONTEXT = (1 << 4),
 } eSpaceButtons_Flag;
 
+/* SpaceProperties.outliner_sync */
+typedef enum eSpaceButtons_OutlinerSync {
+  PROPERTIES_SYNC_AUTO = 0,
+  PROPERTIES_SYNC_OFF = 1,
+  PROPERTIES_SYNC_ON = 2,
+} eSpaceButtons_OutlinerSync;
+
 /** \} */
 
 /* -------------------------------------------------------------------- */