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/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index 19390a634fa..82d6115fbbb 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -320,6 +320,9 @@ struct uiBut {
 	void *editcoba;
 	void *editcumap;
 
+	uiButPushedStateFunc pushed_state_func;
+	void *pushed_state_arg;
+
 	/* pointer back */
 	uiBlock *block;
 };