Add option to link assets on drag & drop

Note: Linking in this case as in link vs. append. Easily confused with linking
a data-block to multiple usages (e.g. single material used by multiple
objects).

Adds a drop-down to the Asset Browser header to choose between Link and Append.
This is probably gonna be a temporary place, T54642 shows where this could be
placed eventually.

Linking support is crucial for usage of the asset browser in production
environments. It just wasn't enabled yet because a) the asset project currently
focuses on single user, not production assets, and b) because there were many
unkowns still for the workflow that have big impact on production use as well.
With the recently held asset workshop I'm more confident with enabling linking,
as design ideas relevant to production use were confirmed.

Differential Revision: https://developer.blender.org/D11536

Reviewed by: Bastien Montagne

1 files changed, 24 insertions, 6 deletions

diff --git a/source/blender/editors/space_file/file_draw.c b/source/blender/editors/space_file/file_draw.c
index 189b9b4c874..17d029f7541 100644
--- a/source/blender/editors/space_file/file_draw.c
+++ b/source/blender/editors/space_file/file_draw.c
@@ -142,7 +142,8 @@ static void draw_tile(int sx, int sy, int width, int height, int colorid, int sh
       color);
 }
 
-static void file_draw_icon(uiBlock *block,
+static void file_draw_icon(const SpaceFile *sfile,
+                           uiBlock *block,
                            const FileDirEntry *file,
                            const char *path,
                            int sx,
@@ -177,10 +178,14 @@ static void file_draw_icon(uiBlock *block,
       ImBuf *preview_image = filelist_file_getimage(file);
       char blend_path[FILE_MAX_LIBEXTRA];
       if (BLO_library_path_explode(path, blend_path, NULL, NULL)) {
+        const FileAssetSelectParams *asset_params = ED_fileselect_get_asset_params(sfile);
+        BLI_assert(asset_params != NULL);
+
         UI_but_drag_set_asset(but,
                               file->name,
                               BLI_strdup(blend_path),
                               file->blentype,
+                              asset_params->import_type,
                               icon,
                               preview_image,
                               UI_DPI_FAC);
@@ -299,7 +304,8 @@ void file_calc_previews(const bContext *C, ARegion *region)
   UI_view2d_totRect_set(v2d, sfile->layout->width, sfile->layout->height);
 }
 
-static void file_draw_preview(uiBlock *block,
+static void file_draw_preview(const SpaceFile *sfile,
+                              uiBlock *block,
                               const FileDirEntry *file,
                               const char *path,
                               int sx,
@@ -484,9 +490,19 @@ static void file_draw_preview(uiBlock *block,
     /* path is no more static, cannot give it directly to but... */
     else if (file->typeflag & FILE_TYPE_ASSET) {
       char blend_path[FILE_MAX_LIBEXTRA];
+
       if (BLO_library_path_explode(path, blend_path, NULL, NULL)) {
-        UI_but_drag_set_asset(
-            but, file->name, BLI_strdup(blend_path), file->blentype, icon, imb, scale);
+        const FileAssetSelectParams *asset_params = ED_fileselect_get_asset_params(sfile);
+        BLI_assert(asset_params != NULL);
+
+        UI_but_drag_set_asset(but,
+                              file->name,
+                              BLI_strdup(blend_path),
+                              file->blentype,
+                              asset_params->import_type,
+                              icon,
+                              imb,
+                              scale);
       }
     }
     else {
@@ -925,7 +941,8 @@ void file_draw_list(const bContext *C, ARegion *region)
         is_icon = 1;
       }
 
-      file_draw_preview(block,
+      file_draw_preview(sfile,
+                        block,
                         file,
                         path,
                         sx,
@@ -940,7 +957,8 @@ void file_draw_list(const bContext *C, ARegion *region)
                         is_link);
     }
     else {
-      file_draw_icon(block,
+      file_draw_icon(sfile,
+                     block,
                      file,
                      path,
                      sx,