fixed uiSetLayout(), added uiAddLayout() for accumulative flags

example.cpp

@@ -354,7 +354,7 @@ int panel() {
 int column_append(int parent, int item) {
     uiAppend(parent, item);
     // fill parent horizontally, anchor to previous item vertically
-    uiSetLayout(item, UI_HFILL);
+    uiAddLayout(item, UI_HFILL);
     // if not the first item, add a margin of 1
     uiSetMargins(item, 0, 1, 0, 0);
     return item;
@@ -369,7 +369,7 @@ int column() {
 int vgroup_append(int parent, int item) {
     uiAppend(parent, item);
     // fill parent horizontally, anchor to previous item vertically
-    uiSetLayout(item, UI_HFILL);
+    uiAddLayout(item, UI_HFILL);
     return item;
 }
 
@@ -381,7 +381,7 @@ int vgroup() {
 
 int hgroup_append(int parent, int item) {
     uiAppend(parent, item);
-    uiSetLayout(item, UI_HFILL);
+    uiAddLayout(item, UI_HFILL);
     return item;
 }
 
@@ -398,7 +398,7 @@ int hgroup() {
 
 int row_append(int parent, int item) {
     uiAppend(parent, item);
-    uiSetLayout(item, UI_HFILL);
+    uiAddLayout(item, UI_HFILL);
     return item;
 }
 
@@ -658,7 +658,7 @@ void draw(NVGcontext *vg, float w, float h) {
     int col = column();
     uiAppend(root, col);
     uiSetMargins(col, 10, 10, 10, 10);
-    uiSetLayout(col, UI_TOP|UI_HFILL);
+    uiAddLayout(col, UI_TOP|UI_HFILL);
     
     
     column_append(col, button(BND_ICONID(6,3), "Item 1", demohandler));

oui.h

@@ -516,6 +516,9 @@ OUI_EXPORT void uiSetSize(int item, int w, int h);
 // set the anchoring behavior of the item to one or multiple UIlayoutFlags
 OUI_EXPORT void uiSetLayout(int item, int flags);
 
+// like uiSetLayout, but accumulates to the existing flags
+OUI_EXPORT void uiAddLayout(int item, int flags);
+
 // set the left, top, right and bottom margins of an item; when the item is
 // anchored to the parent or another item, the margin controls the distance
 // from the neighboring element.
@@ -1000,7 +1003,14 @@ int uiGetHeight(int item) {
 }
 
 void uiSetLayout(int item, int flags) {
-    uiItemPtr(item)->flags |= flags & UI_ITEM_LAYOUT_MASK;
+    UIitem *pitem = uiItemPtr(item);
+    pitem->flags &= ~UI_ITEM_LAYOUT_MASK;
+    pitem->flags |= flags & UI_ITEM_LAYOUT_MASK;
+}
+
+void uiAddLayout(int item, int flags) {
+    UIitem *pitem = uiItemPtr(item);
+    pitem->flags |= flags & UI_ITEM_LAYOUT_MASK;
 }
 
 int uiGetLayout(int item) {