Asset System: "Mark Asset" & "Clear Asset" operators and UI integration

This makes it possible to turn data-blocks into assets and back into normal
data-blocks. A core design decision made for the asset system is that not every
data-block should be an asset, because not every data-block is made for reuse.
Users have to explicitly mark data-blocks as assets.

Exposes "Mark Asset" and "Clear Asset" in Outliner context menus (currently ID
Data submenu) and button context menus. We are still not too happy with the
names, they may change.

This uses the new context members to pass data-blocks to operators, added in
af008f553293 and 0c1d4769235c.

Part of the first Asset Browser milestone. Check the #asset_browser_milestone_1
project milestone on developer.blender.org.

Differential Revision: https://developer.blender.org/D9717

Reviewed by: Brecht Van Lommel

1 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_context_menu.c b/source/blender/editors/interface/interface_context_menu.c
index 3e76cd1cde4..870c3a2a13f 100644
--- a/source/blender/editors/interface/interface_context_menu.c
+++ b/source/blender/editors/interface/interface_context_menu.c
@@ -38,6 +38,7 @@
 #include "BKE_idprop.h"
 #include "BKE_screen.h"
 
+#include "ED_asset.h"
 #include "ED_keyframing.h"
 #include "ED_screen.h"
 
@@ -952,6 +953,22 @@ bool ui_popup_context_menu_for_button(bContext *C, uiBut *but)
     }
   }
 
+  /* If the button reprents an id, it can set the "id" context pointer. */
+  if (ED_asset_can_make_single_from_context(C)) {
+    ID *id = CTX_data_pointer_get_type(C, "id", &RNA_ID).data;
+
+    /* Gray out items depending on if data-block is an asset. Preferably this could be done via
+     * operator poll, but that doesn't work since the operator also works with "selected_ids",
+     * which isn't cheap to check. */
+    uiLayout *sub = uiLayoutColumn(layout, true);
+    uiLayoutSetEnabled(sub, !id->asset_data);
+    uiItemO(sub, NULL, ICON_NONE, "ASSET_OT_mark");
+    sub = uiLayoutColumn(layout, true);
+    uiLayoutSetEnabled(sub, id->asset_data);
+    uiItemO(sub, NULL, ICON_NONE, "ASSET_OT_clear");
+    uiItemS(layout);
+  }
+
   /* Pointer properties and string properties with
    * prop_search support jumping to target object/bone. */
   if (but->rnapoin.data && but->rnaprop) {