UI: add subpanel support.

In the Python API, any panel becomes a subpanel by setting bl_parent_id
to the name of the parent panel. These subpanels can contain advanced or
less commonly used settings.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_screen.h b/source/blender/blenkernel/BKE_screen.h
index f284e633c5e..0b95152ad8e 100644
--- a/source/blender/blenkernel/BKE_screen.h
+++ b/source/blender/blenkernel/BKE_screen.h
@@ -205,7 +205,8 @@ typedef struct PanelType {
 	char translation_context[BKE_ST_MAXNAME];
 	char context[BKE_ST_MAXNAME];             /* for buttons window */
 	char category[BKE_ST_MAXNAME];            /* for category tabs */
-	char owner_id[BKE_ST_MAXNAME];              /* for work-spaces to selectively show. */
+	char owner_id[BKE_ST_MAXNAME];            /* for work-spaces to selectively show. */
+	char parent_id[BKE_ST_MAXNAME];           /* parent idname for subpanels */
 	int space_type;
 	int region_type;
 
@@ -218,6 +219,10 @@ typedef struct PanelType {
 	/* draw entirely, view changes should be handled here */
 	void (*draw)(const struct bContext *C, struct Panel *pa);
 
+	/* sub panels */
+	struct PanelType *parent;
+	ListBase children;
+
 	/* RNA integration */
 	ExtensionRNA ext;
 } PanelType;