UI support for showing candidates for string properties

Currently strings are used for cases where a list of identifiers would
be useful to show.

Add support for string properties to reference a callback to populate
candidates to show when editing a string. The user isn't prevented from
typing in text not found in this list, it's just useful as a reference.

Support for expanding the following strings has been added:

- Operator, menu & panel identifiers in the keymap editor.
- WM operators that reference data-paths expand using the
  Python-consoles auto-complete functionality.
- Names of keying sets for insert/delete keyframe operators.

Details:

- `bpy.props.StringProperty` takes an option `search` callback.

- A new string callback has been added, set via
  `RNA_def_property_string_search_func` or
  `RNA_def_property_string_search_func_runtime`.

- Addresses usability issue highlighted by T89560,
  where setting keying set identifiers as strings isn't practical.

- Showing additional right-aligned text in the search results is
  supported but disabled by default as the text is too cramped in most
  string search popups where the feature would make sense. It could be
  enabled as part of other layout tweaks.

Reviewed By: brecht

Ref D14986

1 files changed, 66 insertions, 0 deletions

diff --git a/source/blender/editors/animation/keyingsets.c b/source/blender/editors/animation/keyingsets.c
index 6fcdd21bad8..97b81277008 100644
--- a/source/blender/editors/animation/keyingsets.c
+++ b/source/blender/editors/animation/keyingsets.c
@@ -708,6 +708,72 @@ KeyingSet *ANIM_get_keyingset_for_autokeying(const Scene *scene, const char *tra
   return ANIM_builtin_keyingset_get_named(NULL, transformKSName);
 }
 
+static void anim_keyingset_visit_for_search_impl(const bContext *C,
+                                                 StringPropertySearchVisitFunc visit_fn,
+                                                 void *visit_user_data,
+                                                 const bool use_poll)
+{
+  /* Poll requires context.  */
+  if (use_poll && (C == NULL)) {
+    return;
+  }
+
+  Scene *scene = C ? CTX_data_scene(C) : NULL;
+  KeyingSet *ks;
+
+  /* Active Keying Set. */
+  if (!use_poll || (scene && scene->active_keyingset)) {
+    StringPropertySearchVisitParams visit_params = {NULL};
+    visit_params.text = "__ACTIVE__";
+    visit_params.info = "Active Keying Set";
+    visit_fn(visit_user_data, &visit_params);
+  }
+
+  /* User-defined Keying Sets. */
+  if (scene && scene->keyingsets.first) {
+    for (ks = scene->keyingsets.first; ks; ks = ks->next) {
+      if (use_poll && !ANIM_keyingset_context_ok_poll((bContext *)C, ks)) {
+        continue;
+      }
+      StringPropertySearchVisitParams visit_params = {NULL};
+      visit_params.text = ks->idname;
+      visit_params.info = ks->name;
+      visit_fn(visit_user_data, &visit_params);
+    }
+  }
+
+  /* Builtin Keying Sets. */
+  for (ks = builtin_keyingsets.first; ks; ks = ks->next) {
+    if (use_poll && !ANIM_keyingset_context_ok_poll((bContext *)C, ks)) {
+      continue;
+    }
+    StringPropertySearchVisitParams visit_params = {NULL};
+    visit_params.text = ks->idname;
+    visit_params.info = ks->name;
+    visit_fn(visit_user_data, &visit_params);
+  }
+}
+
+void ANIM_keyingset_visit_for_search(const bContext *C,
+                                     PointerRNA *UNUSED(ptr),
+                                     PropertyRNA *UNUSED(prop),
+                                     const char *UNUSED(edit_text),
+                                     StringPropertySearchVisitFunc visit_fn,
+                                     void *visit_user_data)
+{
+  anim_keyingset_visit_for_search_impl(C, visit_fn, visit_user_data, false);
+}
+
+void ANIM_keyingset_visit_for_search_no_poll(const bContext *C,
+                                             PointerRNA *UNUSED(ptr),
+                                             PropertyRNA *UNUSED(prop),
+                                             const char *UNUSED(edit_text),
+                                             StringPropertySearchVisitFunc visit_fn,
+                                             void *visit_user_data)
+{
+  anim_keyingset_visit_for_search_impl(C, visit_fn, visit_user_data, true);
+}
+
 /* Menu of All Keying Sets ----------------------------- */
 
 const EnumPropertyItem *ANIM_keying_sets_enum_itemf(bContext *C,