UI: Preferences Redesign Part 2

(Part 1 was 00963afc14978b)

Does the following changes visible to users:
* Use panels and sub-panels for more structured & logical grouping
* Re-organized options more logically than before (see images in D4148)
* Use flow layout (single column by default).
* New layout uses horizontal margin if there's enough space.
* Change size of Preferences window to suit new layout.
* Move keymap related options from "Input" into own section.
* Own, left-bottom aligned region for Save Preferences button.
* Adjustments of names, tooltips & icons.
* Move buttons from header into the main region (except editor switch).
* Hide Preferences header when opened in temporary window.
* Use full area width for header.
* Don't use slider but regular number widget for UI scale.
* Gray out animation player path option if player isn't "Custom"

Internal changes:
* Rearrange RNA properties to match changed UI structure.
* Introduces new "EXECUTE" region type, see reasoning in D3982.
* Changes to panel layout and AZone code for dynamic panel region.
* Bumps subversion and does versioning for new regions.

RNA changes are documented in the release notes:
https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Python_API/Preferences_API

Design & implementation mostly done by @billreynish and myself.
I recommend checking out the screenshots posted by William:
https://developer.blender.org/D4148#93787

Reviewed By: brecht

Maniphest Tasks: T54115

Differential Revision: https://developer.blender.org/D4148

1 files changed, 38 insertions, 5 deletions

diff --git a/source/blender/editors/space_userpref/space_userpref.c b/source/blender/editors/space_userpref/space_userpref.c
index a0a263cb5de..497cca22ba6 100644
--- a/source/blender/editors/space_userpref/space_userpref.c
+++ b/source/blender/editors/space_userpref/space_userpref.c
@@ -61,6 +61,14 @@ static SpaceLink *userpref_new(const ScrArea *UNUSED(area), const Scene *UNUSED(
 	spref = MEM_callocN(sizeof(SpaceUserPref), "inituserpref");
 	spref->spacetype = SPACE_USERPREF;
 
+	/* header */
+	ar = MEM_callocN(sizeof(ARegion), "header for userpref");
+
+	BLI_addtail(&spref->regionbase, ar);
+	ar->regiontype = RGN_TYPE_HEADER;
+	/* Ignore user preference "USER_HEADER_BOTTOM" here (always show bottom for new types). */
+	ar->alignment = RGN_ALIGN_BOTTOM;
+
 	/* navigation region */
 	ar = MEM_callocN(sizeof(ARegion), "navigation region for userpref");
 
@@ -68,13 +76,13 @@ static SpaceLink *userpref_new(const ScrArea *UNUSED(area), const Scene *UNUSED(
 	ar->regiontype = RGN_TYPE_NAV_BAR;
 	ar->alignment = RGN_ALIGN_LEFT;
 
-	/* header */
-	ar = MEM_callocN(sizeof(ARegion), "header for userpref");
+	/* execution region */
+	ar = MEM_callocN(sizeof(ARegion), "execution region for userpref");
 
 	BLI_addtail(&spref->regionbase, ar);
-	ar->regiontype = RGN_TYPE_HEADER;
-	/* Ignore user preference "USER_HEADER_BOTTOM" here (always show bottom for new types). */
-	ar->alignment = RGN_ALIGN_BOTTOM;
+	ar->regiontype = RGN_TYPE_EXECUTE;
+	ar->alignment = RGN_ALIGN_BOTTOM | RGN_SPLIT_PREV;
+	ar->flag |= RGN_FLAG_DYNAMIC_SIZE;
 
 	/* main region */
 	ar = MEM_callocN(sizeof(ARegion), "main region for userpref");
@@ -159,6 +167,13 @@ static void userpref_navigation_region_draw(const bContext *C, ARegion *ar)
 	ED_region_panels(C, ar);
 }
 
+/* add handlers, stuff you only do once or on area/region changes */
+static void userpref_execute_region_init(wmWindowManager *wm, ARegion *ar)
+{
+	ED_region_panels_init(wm, ar);
+	ar->v2d.keepzoom |= V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y;
+}
+
 static void userpref_main_region_listener(
         wmWindow *UNUSED(win), ScrArea *UNUSED(sa), ARegion *UNUSED(ar),
         wmNotifier *UNUSED(wmn), const Scene *UNUSED(scene))
@@ -186,6 +201,13 @@ static void userpref_navigation_region_listener(
 	/* context changes */
 }
 
+static void userpref_execute_region_listener(
+        wmWindow *UNUSED(win), ScrArea *UNUSED(sa), ARegion *UNUSED(ar),
+        wmNotifier *UNUSED(wmn), const Scene *UNUSED(scene))
+{
+	/* context changes */
+}
+
 /* only called once, from space/spacetypes.c */
 void ED_spacetype_userpref(void)
 {
@@ -234,6 +256,17 @@ void ED_spacetype_userpref(void)
 
 	BLI_addhead(&st->regiontypes, art);
 
+	/* regions: execution window */
+	art = MEM_callocN(sizeof(ARegionType), "spacetype userpref region");
+	art->regionid = RGN_TYPE_EXECUTE;
+	art->init = userpref_execute_region_init;
+	art->layout = ED_region_panels_layout;
+	art->draw = ED_region_panels_draw;
+	art->listener = userpref_execute_region_listener;
+	art->keymapflag = ED_KEYMAP_UI;
+
+	BLI_addhead(&st->regiontypes, art);
+
 
 	BKE_spacetype_register(st);
 }