Improved Area Border Selection and Dragging

Allow use of the full width of visible borders when dragging to resize areas.

Differential Revision: https://developer.blender.org/D7823

Reviewed by Brecht Van Lommel

3 files changed, 8 insertions, 3 deletions

diff --git a/source/blender/editors/screen/screen_edit.c b/source/blender/editors/screen/screen_edit.c
index 00afbf452dd..77f68eed883 100644
--- a/source/blender/editors/screen/screen_edit.c
+++ b/source/blender/editors/screen/screen_edit.c
@@ -690,8 +690,10 @@ void ED_screen_set_active_region(bContext *C, wmWindow *win, const int xy[2])
   ARegion *region_prev = screen->active_region;
 
   ED_screen_areas_iter (win, screen, area_iter) {
-    if (xy[0] > area_iter->totrct.xmin && xy[0] < area_iter->totrct.xmax) {
-      if (xy[1] > area_iter->totrct.ymin && xy[1] < area_iter->totrct.ymax) {
+    if (xy[0] > (area_iter->totrct.xmin + BORDERPADDING) &&
+        xy[0] < (area_iter->totrct.xmax - BORDERPADDING)) {
+      if (xy[1] > (area_iter->totrct.ymin + BORDERPADDING) &&
+          xy[1] < (area_iter->totrct.ymax - BORDERPADDING)) {
         if (ED_area_azones_update(area_iter, xy) == NULL) {
           area = area_iter;
           break;
diff --git a/source/blender/editors/screen/screen_geometry.c b/source/blender/editors/screen/screen_geometry.c
index 4069795657e..47580c2f4b3 100644
--- a/source/blender/editors/screen/screen_geometry.c
+++ b/source/blender/editors/screen/screen_geometry.c
@@ -92,7 +92,7 @@ ScrEdge *screen_geom_area_map_find_active_scredge(const ScrAreaMap *area_map,
                                                   const int mx,
                                                   const int my)
 {
-  int safety = U.widget_unit / 10;
+  int safety = BORDERPADDING;
 
   CLAMP_MIN(safety, 2);
 
diff --git a/source/blender/editors/screen/screen_intern.h b/source/blender/editors/screen/screen_intern.h
index 3dfc147bc73..a5e0263104d 100644
--- a/source/blender/editors/screen/screen_intern.h
+++ b/source/blender/editors/screen/screen_intern.h
@@ -35,6 +35,9 @@ struct bContextDataResult;
 #define AZONEFADEIN (5.0f * U.widget_unit)  /* when azone is totally visible */
 #define AZONEFADEOUT (6.5f * U.widget_unit) /* when we start seeing the azone */
 
+/* Expanded interaction influence of area borders. */
+#define BORDERPADDING (U.dpi_fac + U.pixelsize)
+
 /* area.c */
 void ED_area_data_copy(ScrArea *area_dst, ScrArea *area_src, const bool do_free);
 void ED_area_data_swap(ScrArea *sa1, ScrArea *sa2);