Commit: b08fa7a6d981d8fa28a03a288b89bba909fb5092
Author: Severin
Date:   Sat Jun 30 16:51:31 2018 +0200
Branches: blender2.8
https://developer.blender.org/rBb08fa7a6d981d8fa28a03a288b89bba909fb5092

UI: Support status-bar hiding

Just like the top-bar, the status-bar can now be hidden/collapsed by dragging
its edge. We display a small line with the editor outline color then, so there
is something that can be dragged up to un-collapse the area again.
This collapsed state is not written to files yet.

===================================================================

M       source/blender/editors/screen/area.c
M       source/blender/editors/screen/screen_edit.c
M       source/blender/editors/screen/screen_ops.c

===================================================================

diff --git a/source/blender/editors/screen/area.c 
b/source/blender/editors/screen/area.c
index e96580855d3..207047c2ad3 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -421,6 +421,17 @@ void ED_area_do_msg_notify_tag_refresh(
        ED_area_tag_refresh(sa);
 }
 
+/**
+ * Although there's no general support for minimizing areas, the status-bar can
+ * be snapped to be only a few pixels high. A few pixels rather than 0 so it
+ * can be un-minimized again. We consider it pseudo-minimalized and don't draw
+ * it then.
+ */
+static bool area_is_pseudo_minimized(const ScrArea *area)
+{
+       return (area->winx < 3) || (area->winy < 3);
+}
+
 /* only exported for WM */
 void ED_region_do_layout(bContext *C, ARegion *ar)
 {
@@ -432,7 +443,7 @@ void ED_region_do_layout(bContext *C, ARegion *ar)
                return;
        }
 
-       if (at->do_lock) {
+       if (at->do_lock || (sa && area_is_pseudo_minimized(sa))) {
                return;
        }
 
@@ -462,8 +473,13 @@ void ED_region_do_draw(bContext *C, ARegion *ar)
 
        UI_SetTheme(sa ? sa->spacetype : 0, at->regionid);
 
+       if (sa && area_is_pseudo_minimized(sa)) {
+               UI_ThemeClearColor(TH_EDITOR_OUTLINE);
+               glClear(GL_COLOR_BUFFER_BIT);
+               return;
+       }
        /* optional header info instead? */
-       if (ar->headerstr) {
+       else if (ar->headerstr) {
                UI_ThemeClearColor(TH_HEADER);
                glClear(GL_COLOR_BUFFER_BIT);
 
diff --git a/source/blender/editors/screen/screen_edit.c 
b/source/blender/editors/screen/screen_edit.c
index 1b2908104f5..6bc8a6c10cf 100644
--- a/source/blender/editors/screen/screen_edit.c
+++ b/source/blender/editors/screen/screen_edit.c
@@ -787,7 +787,7 @@ static void screen_global_statusbar_area_create(wmWindow 
*win)
        BLI_rcti_init(&rect, 0, WM_window_pixels_x(win) - 1, 0, 
WM_window_pixels_y(win) - 1);
        rect.ymax = rect.ymin + size_y;
 
-       screen_global_area_create(win, SPACE_STATUSBAR, 
GLOBAL_AREA_ALIGN_BOTTOM, &rect, size_y, size_y, size_y);
+       screen_global_area_create(win, SPACE_STATUSBAR, 
GLOBAL_AREA_ALIGN_BOTTOM, &rect, size_y, 0, size_y);
 }
 
 void ED_screen_global_areas_create(wmWindow *win)
diff --git a/source/blender/editors/screen/screen_ops.c 
b/source/blender/editors/screen/screen_ops.c
index 0c124f6c9a4..ad64018929c 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -1235,8 +1235,11 @@ static void area_move_set_limits(
        if (use_bigger_smaller_snap != NULL) {
                *use_bigger_smaller_snap = false;
                for (ScrArea *area = win->global_areas.areabase.first; area; 
area = area->next) {
-                       const int size_min = ED_area_global_min_size_y(area) - 
1;
-                       const int size_max = ED_area_global_max_size_y(area) - 
1;
+                       int size_min = ED_area_global_min_size_y(area) - 1;
+                       int size_max = ED_area_global_max_size_y(area) - 1;
+
+                       size_min = MAX2(size_min, 0);
+                       BLI_assert(size_min < size_max);
 
                        /* logic here is only tested for lower edge :) */
                        /* left edge */
@@ -1412,7 +1415,8 @@ static int area_snap_calc_location(
                        break;
        }
 
-       BLI_assert(IN_RANGE_INCL(final_loc, origval - smaller, origval + 
bigger));
+       BLI_assert(ELEM(snap_type, SNAP_BIGGER_SMALLER_ONLY) ||
+                  IN_RANGE_INCL(final_loc, origval - smaller, origval + 
bigger));
 
        return final_loc;
 }
@@ -1429,7 +1433,9 @@ static void area_move_apply_do(
        short final_loc = -1;
        bool doredraw = false;
 
-       CLAMP(delta, -smaller, bigger);
+       if (snap_type != SNAP_BIGGER_SMALLER_ONLY) {
+               CLAMP(delta, -smaller, bigger);
+       }
 
        if (snap_type == SNAP_NONE) {
                final_loc = origval + delta;

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