Switch all folder preview rendering to be programmatic (ie. no assets)

-> Refactored the preview background rendering to be much more self-contained.
   This cleans up a lot of code in the CellLayout, and keeps the logic in the
   right place.
-> We switch to software rendering for performance and compatibility reasons.
-> Removed all assets.
-> FolderIcon accept animation includes animation of the clipped region.
-> 1:1 hand-off of drawing of the FolderIcon background between the FolderIcon
   and the CellLayout. Unfortunately, CellLayout rendering is still required
   to work around clipping issues (due to use of software layer). We also
   need this to support folder creation feedback.

Change-Id: Ib8f7fa6359dfedff8145f38dd50ba03849ca0d51

src/com/android/launcher3/Workspace.java

@@ -59,7 +59,6 @@ import android.widget.TextView;
 
 import com.android.launcher3.folder.Folder;
 import com.android.launcher3.folder.FolderIcon;
-import com.android.launcher3.folder.FolderIcon.FolderRingAnimator;
 import com.android.launcher3.Launcher.CustomContentCallbacks;
 import com.android.launcher3.Launcher.LauncherOverlay;
 import com.android.launcher3.UninstallDropTarget.UninstallSource;
@@ -224,7 +223,7 @@ public class Workspace extends PagedView
     public static final int REORDER_TIMEOUT = 350;
     private final Alarm mFolderCreationAlarm = new Alarm();
     private final Alarm mReorderAlarm = new Alarm();
-    @Thunk FolderRingAnimator mDragFolderRingAnimator = null;
+    private FolderIcon.PreviewBackground mFolderCreateBg = new FolderIcon.PreviewBackground();
     private FolderIcon mDragOverFolderIcon = null;
     private boolean mCreateUserFolderOnDrop = false;
     private boolean mAddToExistingFolderOnDrop = false;
@@ -2493,6 +2492,10 @@ public class Workspace extends PagedView
             // If the dragView is null, we can't animate
             boolean animate = dragView != null;
             if (animate) {
+                // In order to keep everything continuous, we hand off the currently rendered
+                // folder background to the newly created icon. This preserves animation state.
+                fi.setFolderBackground(mFolderCreateBg);
+                mFolderCreateBg = new FolderIcon.PreviewBackground();
                 fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
                         postAnimationRunnable);
             } else {
@@ -2855,10 +2858,7 @@ public class Workspace extends PagedView
     }
 
     private void cleanupFolderCreation() {
-        if (mDragFolderRingAnimator != null) {
-            mDragFolderRingAnimator.animateToNaturalState();
-            mDragFolderRingAnimator = null;
-        }
+        mFolderCreateBg.animateToRest();
         mFolderCreationAlarm.setOnAlarmListener(null);
         mFolderCreationAlarm.cancelAlarm();
     }
@@ -3166,18 +3166,16 @@ public class Workspace extends PagedView
             this.layout = layout;
             this.cellX = cellX;
             this.cellY = cellY;
+
+            DeviceProfile grid = mLauncher.getDeviceProfile();
+            BubbleTextView cell = (BubbleTextView) layout.getChildAt(cellX, cellY);
+
+            mFolderCreateBg.setup(getResources().getDisplayMetrics(), grid, null,
+                    cell.getMeasuredWidth(), cell.getPaddingTop());
         }
 
         public void onAlarm(Alarm alarm) {
-            if (mDragFolderRingAnimator != null) {
-                // This shouldn't happen ever, but just in case, make sure we clean up the mess.
-                mDragFolderRingAnimator.animateToNaturalState();
-            }
-            mDragFolderRingAnimator = new FolderRingAnimator(mLauncher, null);
-            mDragFolderRingAnimator.setCell(cellX, cellY);
-            mDragFolderRingAnimator.setCellLayout(layout);
-            mDragFolderRingAnimator.animateToAcceptState();
-            layout.showFolderAccept(mDragFolderRingAnimator);
+            mFolderCreateBg.animateToAccept(layout, cellX, cellY);
             layout.clearDragOutlines();
             setDragMode(DRAG_MODE_CREATE_FOLDER);
         }