Bug 624977 - improve nsXulTreeAccessible selectedItems(), r=surkov, a2.0=davidb

accessible/src/xul/nsXULTreeAccessible.cpp

@@ -295,13 +295,13 @@ nsXULTreeAccessible::SelectedItems()
   if (!selectedItems)
     return nsnull;
 
-  PRInt32 rowIndex, rowCount;
-  PRBool isSelected;
-  mTreeView->GetRowCount(&rowCount);
-  for (rowIndex = 0; rowIndex < rowCount; rowIndex++) {
-    selection->IsSelected(rowIndex, &isSelected);
-    if (isSelected) {
-      nsIAccessible* item = GetTreeItemAccessible(rowIndex);
+  PRInt32 rangeCount = 0;
+  selection->GetRangeCount(&rangeCount);
+  for (PRInt32 rangeIdx = 0; rangeIdx < rangeCount; rangeIdx++) {
+    PRInt32 firstIdx = 0, lastIdx = -1;
+    selection->GetRangeAt(rangeIdx, &firstIdx, &lastIdx);
+    for (PRInt32 rowIdx = firstIdx; rowIdx <= lastIdx; rowIdx++) {
+      nsIAccessible* item = GetTreeItemAccessible(rowIdx);
       if (item)
         selectedItems->AppendElement(item, PR_FALSE);
     }