VSE: Add precise drag and drop and strip previews

This patch adds the drag and drop strip previews in the VSE.
It also adds two new functions to the drag and drop API.

1. "draw_in_view" for callbacks that wants to draw elements in local viewport coordinates
2. "on_drag_start" that can be used for prefetching data only once at the start of the drag.

Reviewed By: Julian, Campbell

Differential Revision: http://developer.blender.org/D14560

1 files changed, 13 insertions, 9 deletions

diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 1d22c2f237b..50d288af0e0 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -712,7 +712,7 @@ static void view3d_ob_drop_matrix_from_snap(V3DSnapCursorState *snap_state,
   }
 }
 
-static void view3d_ob_drop_copy_local_id(wmDrag *drag, wmDropBox *drop)
+static void view3d_ob_drop_copy_local_id(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 {
   ID *id = WM_drag_get_local_ID(drag, ID_OB);
 
@@ -730,7 +730,7 @@ static void view3d_ob_drop_copy_local_id(wmDrag *drag, wmDropBox *drop)
 
 /* Mostly the same logic as #view3d_collection_drop_copy_external_asset(), just different enough to
  * make sharing code a bit difficult. */
-static void view3d_ob_drop_copy_external_asset(wmDrag *drag, wmDropBox *drop)
+static void view3d_ob_drop_copy_external_asset(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 {
   /* NOTE(@campbellbarton): Selection is handled here, de-selecting objects before append,
    * using auto-select to ensure the new objects are selected.
@@ -771,7 +771,9 @@ static void view3d_ob_drop_copy_external_asset(wmDrag *drag, wmDropBox *drop)
   }
 }
 
-static void view3d_collection_drop_copy_local_id(wmDrag *drag, wmDropBox *drop)
+static void view3d_collection_drop_copy_local_id(bContext *UNUSED(C),
+                                                 wmDrag *drag,
+                                                 wmDropBox *drop)
 {
   ID *id = WM_drag_get_local_ID(drag, ID_GR);
   RNA_int_set(drop->ptr, "session_uuid", (int)id->session_uuid);
@@ -779,7 +781,9 @@ static void view3d_collection_drop_copy_local_id(wmDrag *drag, wmDropBox *drop)
 
 /* Mostly the same logic as #view3d_ob_drop_copy_external_asset(), just different enough to make
  * sharing code a bit difficult. */
-static void view3d_collection_drop_copy_external_asset(wmDrag *drag, wmDropBox *drop)
+static void view3d_collection_drop_copy_external_asset(bContext *UNUSED(C),
+                                                       wmDrag *drag,
+                                                       wmDropBox *drop)
 {
   BLI_assert(drag->type == WM_DRAG_ASSET);
 
@@ -815,14 +819,14 @@ static void view3d_collection_drop_copy_external_asset(wmDrag *drag, wmDropBox *
   ED_undo_push(C, "Collection_Drop");
 }
 
-static void view3d_id_drop_copy(wmDrag *drag, wmDropBox *drop)
+static void view3d_id_drop_copy(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 {
   ID *id = WM_drag_get_local_ID_or_import_from_asset(drag, 0);
 
   RNA_string_set(drop->ptr, "name", id->name + 2);
 }
 
-static void view3d_id_drop_copy_with_type(wmDrag *drag, wmDropBox *drop)
+static void view3d_id_drop_copy_with_type(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 {
   ID *id = WM_drag_get_local_ID_or_import_from_asset(drag, 0);
 
@@ -830,7 +834,7 @@ static void view3d_id_drop_copy_with_type(wmDrag *drag, wmDropBox *drop)
   RNA_enum_set(drop->ptr, "type", GS(id->name));
 }
 
-static void view3d_id_path_drop_copy(wmDrag *drag, wmDropBox *drop)
+static void view3d_id_path_drop_copy(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 {
   ID *id = WM_drag_get_local_ID_or_import_from_asset(drag, 0);
 
@@ -878,7 +882,7 @@ static void view3d_dropboxes(void)
                         WM_drag_free_imported_drag_ID,
                         NULL);
 
-  drop->draw = WM_drag_draw_item_name_fn;
+  drop->draw_droptip = WM_drag_draw_item_name_fn;
   drop->draw_activate = view3d_ob_drop_draw_activate;
   drop->draw_deactivate = view3d_ob_drop_draw_deactivate;
 
@@ -889,7 +893,7 @@ static void view3d_dropboxes(void)
                         WM_drag_free_imported_drag_ID,
                         NULL);
 
-  drop->draw = WM_drag_draw_item_name_fn;
+  drop->draw_droptip = WM_drag_draw_item_name_fn;
   drop->draw_activate = view3d_ob_drop_draw_activate;
   drop->draw_deactivate = view3d_ob_drop_draw_deactivate;