Cleanup: decentralize .blend I/O for space types

This adds callbacks to `SpaceType` to make each editor responsible to
manage their own .blend I/O, and moves relevant code from `screen.c`
to the editors files.

Differential Revision: D11069

2 files changed, 35 insertions, 1 deletions

diff --git a/source/blender/editors/space_buttons/CMakeLists.txt b/source/blender/editors/space_buttons/CMakeLists.txt
index d0ad510f5cf..53a00b6d70b 100644
--- a/source/blender/editors/space_buttons/CMakeLists.txt
+++ b/source/blender/editors/space_buttons/CMakeLists.txt
@@ -4,6 +4,7 @@ set(INC
   ../include
   ../../blenkernel
   ../../blenlib
+  ../../blenloader
   ../../blentranslation
   ../../gpu
   ../../makesdna
@@ -11,6 +12,9 @@ set(INC
   ../../windowmanager
   ../../../../intern/guardedalloc
   ../../bmesh
+
+  # dna_type_offsets.h
+  ${CMAKE_CURRENT_BINARY_DIR}/../../makesdna/intern
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
 )
@@ -39,5 +43,5 @@ endif()
 
 blender_add_lib(bf_editor_space_buttons "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
 
-# RNA_prototypes.h
+# RNA_prototypes.h dna_type_offsets.h
 add_dependencies(bf_editor_space_buttons bf_rna)
diff --git a/source/blender/editors/space_buttons/space_buttons.c b/source/blender/editors/space_buttons/space_buttons.c
index 209d60d4f58..5a333869dea 100644
--- a/source/blender/editors/space_buttons/space_buttons.c
+++ b/source/blender/editors/space_buttons/space_buttons.c
@@ -37,6 +37,8 @@
 #include "UI_interface.h"
 #include "UI_resources.h"
 
+#include "BLO_read_write.h"
+
 #include "buttons_intern.h" /* own include */
 
 /* -------------------------------------------------------------------- */
@@ -905,6 +907,31 @@ static void buttons_id_remap(ScrArea *UNUSED(area),
   }
 }
 
+static void buttons_blend_read_data(BlendDataReader *UNUSED(reader), SpaceLink *sl)
+{
+  SpaceProperties *sbuts = (SpaceProperties *)sl;
+
+  sbuts->path = NULL;
+  sbuts->texuser = NULL;
+  sbuts->mainbo = sbuts->mainb;
+  sbuts->mainbuser = sbuts->mainb;
+  sbuts->runtime = NULL;
+}
+
+static void buttons_blend_read_lib(BlendLibReader *reader, ID *parent_id, SpaceLink *sl)
+{
+  SpaceProperties *sbuts = (SpaceProperties *)sl;
+  BLO_read_id_address(reader, parent_id->lib, &sbuts->pinid);
+  if (sbuts->pinid == NULL) {
+    sbuts->flag &= ~SB_PIN_CONTEXT;
+  }
+}
+
+static void buttons_blend_write(BlendWriter *writer, SpaceLink *sl)
+{
+  BLO_write_struct(writer, SpaceProperties, sl);
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -928,6 +955,9 @@ void ED_spacetype_buttons(void)
   st->listener = buttons_area_listener;
   st->context = buttons_context;
   st->id_remap = buttons_id_remap;
+  st->blend_read_data = buttons_blend_read_data;
+  st->blend_read_lib = buttons_blend_read_lib;
+  st->blend_write = buttons_blend_write;
 
   /* regions: main window */
   art = MEM_callocN(sizeof(ARegionType), "spacetype buttons region");