Trebuchet : Add folder on folder checks

- Check if the new folder can accomodate all items
- Don't expand folder if trying to drop folder on folder

Change-Id: I208e3afd4ee6aeeea01928fc77e136d6085c4fdc
(cherry picked from commit 6903b919c835e9e6c9d3a0b6b7e61c31cd12e0ac)

1 files changed, 10 insertions, 1 deletions

diff --git a/src/com/android/launcher3/FolderIcon.java b/src/com/android/launcher3/FolderIcon.java
index 464b35da9..78e8c3a9b 100644
--- a/src/com/android/launcher3/FolderIcon.java
+++ b/src/com/android/launcher3/FolderIcon.java
@@ -325,11 +325,18 @@ public class FolderIcon extends FrameLayout implements FolderListener {
         }
         return ((itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
                 itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT ||
-                itemType == LauncherSettings.Favorites.ITEM_TYPE_FOLDER) &&
+                itemType == LauncherSettings.Favorites.ITEM_TYPE_FOLDER &&
+                canMergeDragFolder((FolderInfo) item)) &&
                 !mFolder.isFull() && item != mInfo && !mInfo.opened &&
                 !hidden);
     }
 
+    private boolean canMergeDragFolder(FolderInfo info) {
+        int currentCount = mFolder.getInfo().contents.size();
+        int dragFolderCount = info.contents.size();
+        return (currentCount + dragFolderCount) <= mFolder.getMaxItems();
+    }
+
     public boolean acceptDrop(Object dragInfo) {
         final ItemInfo item = (ItemInfo) dragInfo;
         if (mInfo.hidden) {
@@ -368,6 +375,8 @@ public class FolderIcon extends FrameLayout implements FolderListener {
                 item = ((AppInfo) mDragInfo).makeShortcut();
                 item.spanX = 1;
                 item.spanY = 1;
+            } else if (mDragInfo instanceof FolderInfo) {
+                return;
             } else {
                 item = (ShortcutInfo) mDragInfo;
             }