Tool System: experimental fallback tool support

Implement T66304 as an experimental option,
available under the preferences "Experimental" section.

- When enabled most tools in the 3D view have a gizmo.
- Dragging outside the gizmo uses the 'fallback' tool.
- The fallback tool can be changed or disabled in the tool options
  or from a pie menu (Alt-W).

1 files changed, 19 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_workspace.c b/source/blender/makesrna/intern/rna_workspace.c
index 47138653af1..7c6e3c2730b 100644
--- a/source/blender/makesrna/intern/rna_workspace.c
+++ b/source/blender/makesrna/intern/rna_workspace.c
@@ -192,6 +192,18 @@ static int rna_WorkSpaceTool_widget_length(PointerRNA *ptr)
   return tref->runtime ? strlen(tref->runtime->gizmo_group) : 0;
 }
 
+static void rna_WorkSpaceTool_tool_fallback_get(PointerRNA *ptr, char *value)
+{
+  bToolRef *tref = ptr->data;
+  strcpy(value, tref->runtime ? tref->runtime->idname_fallback : "");
+}
+
+static int rna_WorkSpaceTool_tool_fallback_length(PointerRNA *ptr)
+{
+  bToolRef *tref = ptr->data;
+  return tref->runtime ? strlen(tref->runtime->idname_fallback) : 0;
+}
+
 #else /* RNA_RUNTIME */
 
 static void rna_def_workspace_owner(BlenderRNA *brna)
@@ -290,6 +302,13 @@ static void rna_def_workspace_tool(BlenderRNA *brna)
       prop, "rna_WorkSpaceTool_widget_get", "rna_WorkSpaceTool_widget_length", NULL);
   RNA_define_verify_sdna(1);
 
+  prop = RNA_def_property(srna, "tool_fallback", PROP_STRING, PROP_NONE);
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_ui_text(prop, "Fallback", "");
+  RNA_def_property_string_funcs(
+      prop, "rna_WorkSpaceTool_tool_fallback_get", "rna_WorkSpaceTool_tool_fallback_length", NULL);
+  RNA_define_verify_sdna(1);
+
   RNA_api_workspace_tool(srna);
 }