UI: support an 'active default' button for pop-ups

Use this for the save confirmation dialog so it has a default action
when pressing enter which draws with a highlight so it's clear what the
default action is (the dialog was just closing before).

Resolves T57686

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_query.c b/source/blender/editors/interface/interface_query.c
index 8300ee71c50..1954e20ab8b 100644
--- a/source/blender/editors/interface/interface_query.c
+++ b/source/blender/editors/interface/interface_query.c
@@ -469,6 +469,21 @@ uiBut *ui_region_find_active_but(ARegion *ar)
 	return NULL;
 }
 
+uiBut *ui_region_find_first_but_test_flag(ARegion *ar, int flag_include, int flag_exclude)
+{
+	for (uiBlock *block = ar->uiblocks.first; block; block = block->next) {
+		for (uiBut *but = block->buttons.first; but; but = but->next) {
+			if (((but->flag & flag_include) == flag_include) &&
+			    ((but->flag & flag_exclude) == 0))
+			{
+				return but;
+			}
+		}
+	}
+
+	return NULL;
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */