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, 37 insertions, 4 deletions

diff --git a/source/blender/editors/transform/transform_gizmo_3d.c b/source/blender/editors/transform/transform_gizmo_3d.c
index 237bf50be7c..bb47f40d84f 100644
--- a/source/blender/editors/transform/transform_gizmo_3d.c
+++ b/source/blender/editors/transform/transform_gizmo_3d.c
@@ -1322,6 +1322,17 @@ static void gizmo_xform_message_subscribe(wmGizmoGroup *gzgroup,
     }
   }
 
+  {
+    extern PropertyRNA rna_ToolSettings_workspace_tool_type;
+    const PropertyRNA *props[] = {
+        &rna_ToolSettings_workspace_tool_type,
+    };
+    for (int i = 0; i < ARRAY_SIZE(props); i++) {
+      WM_msg_subscribe_rna(
+          mbus, &toolsettings_ptr, props[i], &msg_sub_value_gz_tag_refresh, __func__);
+    }
+  }
+
   PointerRNA view3d_ptr;
   RNA_pointer_create(&screen->id, &RNA_SpaceView3D, sa->spacedata.first, &view3d_ptr);
 
@@ -1818,6 +1829,13 @@ static void WIDGETGROUP_gizmo_refresh(const bContext *C, wmGizmoGroup *gzgroup)
   for (int i = MAN_AXIS_RANGE_ROT_START; i < MAN_AXIS_RANGE_ROT_END; i++) {
     ggd->gizmos[i]->select_bias = rotate_select_bias;
   }
+
+  if (scene->toolsettings->workspace_tool_type == SCE_WORKSPACE_TOOL_FALLBACK) {
+    gzgroup->use_fallback_keymap = true;
+  }
+  else {
+    gzgroup->use_fallback_keymap = false;
+  }
 }
 
 static void WIDGETGROUP_gizmo_message_subscribe(const bContext *C,
@@ -2028,7 +2046,7 @@ void VIEW3D_GGT_xform_gizmo(wmGizmoGroupType *gzgt)
   gzgt->name = "3D View: Transform Gizmo";
   gzgt->idname = "VIEW3D_GGT_xform_gizmo";
 
-  gzgt->flag = WM_GIZMOGROUPTYPE_3D;
+  gzgt->flag = WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_TOOL_FALLBACK_KEYMAP;
 
   gzgt->gzmap_params.spaceid = SPACE_VIEW3D;
   gzgt->gzmap_params.regionid = RGN_TYPE_WINDOW;
@@ -2062,7 +2080,8 @@ void VIEW3D_GGT_xform_gizmo_context(wmGizmoGroupType *gzgt)
   gzgt->name = "3D View: Transform Gizmo Context";
   gzgt->idname = "VIEW3D_GGT_xform_gizmo_context";
 
-  gzgt->flag = WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_PERSISTENT;
+  gzgt->flag = WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_PERSISTENT |
+               WM_GIZMOGROUPTYPE_TOOL_FALLBACK_KEYMAP;
 
   gzgt->poll = WIDGETGROUP_gizmo_poll_context;
   gzgt->setup = WIDGETGROUP_gizmo_setup;
@@ -2212,6 +2231,13 @@ static void WIDGETGROUP_xform_cage_refresh(const bContext *C, wmGizmoGroup *gzgr
 
   /* Needed to test view orientation changes. */
   copy_m3_m4(xgzgroup->prev.viewinv_m3, rv3d->viewinv);
+
+  if (scene->toolsettings->workspace_tool_type == SCE_WORKSPACE_TOOL_FALLBACK) {
+    gzgroup->use_fallback_keymap = true;
+  }
+  else {
+    gzgroup->use_fallback_keymap = false;
+  }
 }
 
 static void WIDGETGROUP_xform_cage_message_subscribe(const bContext *C,
@@ -2263,7 +2289,7 @@ void VIEW3D_GGT_xform_cage(wmGizmoGroupType *gzgt)
   gzgt->name = "Transform Cage";
   gzgt->idname = "VIEW3D_GGT_xform_cage";
 
-  gzgt->flag |= WM_GIZMOGROUPTYPE_3D;
+  gzgt->flag |= WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_TOOL_FALLBACK_KEYMAP;
 
   gzgt->gzmap_params.spaceid = SPACE_VIEW3D;
   gzgt->gzmap_params.regionid = RGN_TYPE_WINDOW;
@@ -2385,6 +2411,13 @@ static void WIDGETGROUP_xform_shear_refresh(const bContext *C, wmGizmoGroup *gzg
 
   /* Needed to test view orientation changes. */
   copy_m3_m4(xgzgroup->prev.viewinv_m3, rv3d->viewinv);
+
+  if (scene->toolsettings->workspace_tool_type == SCE_WORKSPACE_TOOL_FALLBACK) {
+    gzgroup->use_fallback_keymap = true;
+  }
+  else {
+    gzgroup->use_fallback_keymap = false;
+  }
 }
 
 static void WIDGETGROUP_xform_shear_message_subscribe(const bContext *C,
@@ -2446,7 +2479,7 @@ void VIEW3D_GGT_xform_shear(wmGizmoGroupType *gzgt)
   gzgt->name = "Transform Shear";
   gzgt->idname = "VIEW3D_GGT_xform_shear";
 
-  gzgt->flag |= WM_GIZMOGROUPTYPE_3D;
+  gzgt->flag |= WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_TOOL_FALLBACK_KEYMAP;
 
   gzgt->gzmap_params.spaceid = SPACE_VIEW3D;
   gzgt->gzmap_params.regionid = RGN_TYPE_WINDOW;