T90371: Asset: Drop Material Tooltip.

This patch changes the drop named material tooltip to give feedback to
the user what is going to happen when they invoke the change.

There are 3 states:
* "": Operator will be canceled as not all data is present (dropping on
  background.)
* "Drop <named material> on <object name> (slot <slot number>, replacing
  <current material in slot>).
* "Drop <named material> on <object name> (slot <slot number).

Reviewed By: Severin

Maniphest Tasks: T90371

Differential Revision: https://developer.blender.org/D12106

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index 4d6cb941347..485d8e5a162 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -115,6 +115,7 @@ struct wmEvent;
 struct wmOperator;
 struct wmWindowManager;
 struct wmDrag;
+struct wmDropBox;
 
 #include "BLI_compiler_attrs.h"
 #include "DNA_listBase.h"
@@ -937,7 +938,8 @@ typedef struct wmDragAsset {
 
 typedef char *(*WMDropboxTooltipFunc)(struct bContext *,
                                       struct wmDrag *,
-                                      const struct wmEvent *event);
+                                      const struct wmEvent *event,
+                                      struct wmDropBox *drop);
 
 typedef struct wmDrag {
   struct wmDrag *next, *prev;