1 files changed, 56 insertions, 0 deletions
diff --git a/source/blender/editors/space_outliner/outliner_utils.c b/source/blender/editors/space_outliner/outliner_utils.c
index d39a9387a6a..5dfdf6f129b 100644
--- a/source/blender/editors/space_outliner/outliner_utils.c
+++ b/source/blender/editors/space_outliner/outliner_utils.c
@@ -327,12 +327,68 @@ float outliner_restrict_columns_width(const SpaceOutliner *soops)
   return (num_columns * UI_UNIT_X + V2D_SCROLL_WIDTH);
 }
 
+/* Find first tree element in tree with matching treestore flag */
+TreeElement *outliner_find_element_with_flag(const ListBase *lb, short flag)
+{
+  for (TreeElement *te = lb->first; te; te = te->next) {
+    if ((TREESTORE(te)->flag & flag) == flag) {
+      return te;
+    }
+    TreeElement *active_element = outliner_find_element_with_flag(&te->subtree, flag);
+    if (active_element) {
+      return active_element;
+    }
+  }
+  return NULL;
+}
+
+/* Find if element is visible in the outliner tree */
+bool outliner_is_element_visible(const TreeElement *te)
+{
+  TreeStoreElem *tselem;
+
+  while (te->parent) {
+    tselem = TREESTORE(te->parent);
+
+    if (tselem->flag & TSE_CLOSED) {
+      return false;
+    }
+    else {
+      te = te->parent;
+    }
+  }
+
+  return true;
+}
+
 /* Find if x coordinate is over element disclosure toggle */
 bool outliner_item_is_co_within_close_toggle(TreeElement *te, float view_co_x)
 {
   return (view_co_x > te->xs) && (view_co_x < te->xs + UI_UNIT_X);
 }
 
+/* Scroll view vertically while keeping within total bounds */
+void outliner_scroll_view(ARegion *ar, int delta_y)
+{
+  int y_min = MIN2(ar->v2d.cur.ymin, ar->v2d.tot.ymin);
+
+  ar->v2d.cur.ymax += delta_y;
+  ar->v2d.cur.ymin += delta_y;
+
+  /* Adjust view if delta placed view outside total area */
+  int offset;
+  if (ar->v2d.cur.ymax > -UI_UNIT_Y) {
+    offset = ar->v2d.cur.ymax;
+    ar->v2d.cur.ymax -= offset;
+    ar->v2d.cur.ymin -= offset;
+  }
+  else if (ar->v2d.cur.ymin < y_min) {
+    offset = y_min - ar->v2d.cur.ymin;
+    ar->v2d.cur.ymax += offset;
+    ar->v2d.cur.ymin += offset;
+  }
+}
+
 /* Get base of object under cursor. Used for eyedropper tool */
 Base *ED_outliner_give_base_under_cursor(bContext *C, const int mval[2])
 {