2 files changed, 95 insertions, 4 deletions

diff --git a/indra/llui/llflatlistview.cpp b/indra/llui/llflatlistview.cpp
index 7b7a3139a4..3754d155cf 100644
--- a/indra/llui/llflatlistview.cpp
+++ b/indra/llui/llflatlistview.cpp
@@ -66,7 +66,7 @@ const LLRect& LLFlatListView::getItemsRect() const
 	return mItemsPanel->getRect(); 
 }
 
-bool LLFlatListView::addItem(LLPanel * item, const LLSD& value /*= LLUUID::null*/, EAddPosition pos /*= ADD_BOTTOM*/)
+bool LLFlatListView::addItem(LLPanel * item, const LLSD& value /*= LLUUID::null*/, EAddPosition pos /*= ADD_BOTTOM*/,bool rearrange /*= true*/)
 {
 	if (!item) return false;
 	if (value.isUndefined()) return false;
@@ -97,8 +97,11 @@ bool LLFlatListView::addItem(LLPanel * item, const LLSD& value /*= LLUUID::null*
 	// Children don't accept the focus
 	item->setTabStop(false);
 
-	rearrangeItems();
-	notifyParentItemsRectChanged();
+	if (rearrange)
+	{
+		rearrangeItems();
+		notifyParentItemsRectChanged();
+	}
 	return true;
 }
 
@@ -980,7 +983,86 @@ S32 LLFlatListView::notify(const LLSD& info)
 			return 1;
 		}
 	}
+	else if (info.has("rearrange"))
+	{
+		rearrangeItems();
+		notifyParentItemsRectChanged();
+		return 1;
+	}
 	return 0;
 }
 
+void LLFlatListView::detachItems(std::vector<LLPanel*>& detached_items)
+{
+	LLSD action;
+	action.with("detach", LLSD());
+	// Clear detached_items list
+	detached_items.clear();
+	// Go through items and detach valid items, remove them from items panel
+	// and add to detached_items.
+	for (pairs_iterator_t
+			 iter = mItemPairs.begin(),
+			 iter_end = mItemPairs.end();
+		 iter != iter_end; ++iter)
+	{
+		LLPanel* pItem = (*iter)->first;
+		if (1 == pItem->notify(action))
+		{
+			selectItemPair((*iter), false);
+			mItemsPanel->removeChild(pItem);
+			detached_items.push_back(pItem);
+		}
+	}
+	if (!detached_items.empty())
+	{
+		// Some items were detached, clean ourself from unusable memory
+		if (detached_items.size() == mItemPairs.size())
+		{
+			// This way will be faster if all items were disconnected
+			for (pairs_iterator_t
+					 iter = mItemPairs.begin(),
+					 iter_end = mItemPairs.end();
+				 iter != iter_end; ++iter)
+			{
+				(*iter)->first = NULL;
+				delete *iter;
+			}
+			mItemPairs.clear();
+			// Also set items panel height to zero.
+			// Reshape it to allow reshaping of non-item children.
+			LLRect rc = mItemsPanel->getRect();
+			rc.mBottom = rc.mTop;
+			mItemsPanel->reshape(rc.getWidth(), rc.getHeight());
+			mItemsPanel->setRect(rc);
+			setNoItemsCommentVisible(true);
+		}
+		else
+		{
+			for (std::vector<LLPanel*>::const_iterator
+					 detached_iter = detached_items.begin(),
+					 detached_iter_end = detached_items.end();
+				 detached_iter != detached_iter_end; ++detached_iter)
+			{
+				LLPanel* pDetachedItem = *detached_iter;
+				for (pairs_iterator_t
+						 iter = mItemPairs.begin(),
+						 iter_end = mItemPairs.end();
+					 iter != iter_end; ++iter)
+				{
+					item_pair_t* item_pair = *iter;
+					if (item_pair->first == pDetachedItem)
+					{
+						mItemPairs.erase(iter);
+						item_pair->first = NULL;
+						delete item_pair;
+						break;
+					}
+				}
+			}
+			rearrangeItems();
+		}
+		notifyParentItemsRectChanged();
+	}
+}
+
 //EOF
diff --git a/indra/llui/llflatlistview.h b/indra/llui/llflatlistview.h
index a488b00854..5999e79f61 100644
--- a/indra/llui/llflatlistview.h
+++ b/indra/llui/llflatlistview.h
@@ -133,7 +133,7 @@ public:
 	 * Adds and item and LLSD value associated with it to the list at specified position
 	 * @return true if the item was added, false otherwise 
 	 */
-	virtual bool addItem(LLPanel * item, const LLSD& value = LLUUID::null, EAddPosition pos = ADD_BOTTOM);
+	virtual bool addItem(LLPanel * item, const LLSD& value = LLUUID::null, EAddPosition pos = ADD_BOTTOM, bool rearrange = true);
 
 	/**
 	 * Insert item_to_add along with associated value to the list right after the after_item.
@@ -271,6 +271,15 @@ public:
 	virtual void clear();
 
 	/**
+	 * Removes all items that can be detached from the list but doesn't destroy
+	 * them, caller responsible to manage items after they are detached.
+	 * Detachable item should accept "detach" action via notify() method,
+	 * where it disconnect all callbacks, does other valuable routines and
+	 * return 1.
+	 */
+	void detachItems(std::vector<LLPanel*>& detached_items);
+
+	/**
 	 * Set comparator to use for future sorts.
 	 * 
 	 * This class does NOT manage lifetime of the comparator