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_layout.c b/source/blender/editors/interface/interface_layout.c
index e2933f75440..6c4389aabd9 100644
--- a/source/blender/editors/interface/interface_layout.c
+++ b/source/blender/editors/interface/interface_layout.c
@@ -160,6 +160,7 @@ struct uiLayout {
 	short space;
 	bool align;
 	bool active;
+	bool active_default;
 	bool activate_init;
 	bool enabled;
 	bool redalert;
@@ -1060,6 +1061,10 @@ static uiBut *uiItemFullO_ptr_ex(
 		UI_but_flag_enable(but, UI_BUT_REDALERT);
 	}
 
+	if (layout->active_default) {
+		UI_but_flag_enable(but, UI_BUT_ACTIVE_DEFAULT);
+	}
+
 	/* assign properties */
 	if (properties || r_opptr) {
 		PointerRNA *opptr = UI_but_operator_ptr_get(but);
@@ -4150,6 +4155,11 @@ void uiLayoutSetActive(uiLayout *layout, bool active)
 	layout->active = active;
 }
 
+void uiLayoutSetActiveDefault(uiLayout *layout, bool active_default)
+{
+	layout->active_default = active_default;
+}
+
 void uiLayoutSetActivateInit(uiLayout *layout, bool activate_init)
 {
 	layout->activate_init = activate_init;
@@ -4225,6 +4235,11 @@ bool uiLayoutGetActive(uiLayout *layout)
 	return layout->active;
 }
 
+bool uiLayoutGetActiveDefault(uiLayout *layout)
+{
+	return layout->active_default;
+}
+
 bool uiLayoutGetActivateInit(uiLayout *layout)
 {
 	return layout->activate_init;