Fix T62016: Outliner visibility icons drag behaviour broken

We are mixing bool and fancy 3-in-1 func-set buttons in the outliner.
So they would return different pushed state in
ui_drag_toggle_but_pushed_state().

We now have a callback function that allows the button to set its own
pushed_button_state callback function.

Note: This is a bit of overkill since we are planning to change the
3-in-1 outliner buttons. That said, it may be nice to have, since in the
future we can mix those buttons for other things.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D4434

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 9c771994c4b..d9b2b09a117 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -438,6 +438,7 @@ typedef struct ARegion *(*uiButSearchCreateFunc)(struct bContext *C, struct AReg
 typedef void (*uiButSearchFunc)(const struct bContext *C, void *arg, const char *str, uiSearchItems *items);
 /* Must return allocated string. */
 typedef char *(*uiButToolTipFunc)(struct bContext *C, void *argN, const char *tip);
+typedef int (*uiButPushedStateFunc)(struct bContext *C, void *arg);
 
 typedef void (*uiBlockHandleFunc)(struct bContext *C, void *arg, int event);
 
@@ -880,6 +881,8 @@ void UI_but_focus_on_enter_event(struct wmWindow *win, uiBut *but);
 
 void UI_but_func_hold_set(uiBut *but, uiButHandleHoldFunc func, void *argN);
 
+void UI_but_func_pushed_state_set(uiBut *but, uiButPushedStateFunc func, void *arg);
+
 /* Autocomplete
  *
  * Tab complete helper functions, for use in uiButCompleteFunc callbacks.