1 files changed, 58 insertions, 11 deletions

diff --git a/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java b/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java
index ff357c0bc..f25345ee8 100644
--- a/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java
+++ b/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java
@@ -1,15 +1,18 @@
 package com.android.launcher3.folder;
 
+
 public class ClippedFolderIconLayoutRule implements FolderIcon.PreviewLayoutRule {
 
     static final int MAX_NUM_ITEMS_IN_PREVIEW = 4;
     private static final int MIN_NUM_ITEMS_IN_PREVIEW = 2;
-    private static final int MAX_NUM_ITEMS_PER_ROW = 2;
 
-    final float MIN_SCALE = 0.48f;
-    final float MAX_SCALE = 0.58f;
-    final float MAX_RADIUS_DILATION = 0.15f;
-    final float ITEM_RADIUS_SCALE_FACTOR = 1.33f;
+    private static final float MIN_SCALE = 0.48f;
+    private static final float MAX_SCALE = 0.58f;
+    private static final float MAX_RADIUS_DILATION = 0.15f;
+    private static final float ITEM_RADIUS_SCALE_FACTOR = 1.33f;
+
+    private static final int EXIT_INDEX = -2;
+    private static final int ENTER_INDEX = -3;
 
     private float[] mTmpPoint = new float[2];
 
@@ -31,21 +34,29 @@ public class ClippedFolderIconLayoutRule implements FolderIcon.PreviewLayoutRule
     @Override
     public PreviewItemDrawingParams computePreviewItemDrawingParams(int index, int curNumItems,
             PreviewItemDrawingParams params) {
-
         float totalScale = scaleForItem(index, curNumItems);
         float transX;
         float transY;
         float overlayAlpha = 0;
 
-        // Items beyond those displayed in the preview are animated to the center
-        if (index >= MAX_NUM_ITEMS_IN_PREVIEW) {
-            transX = transY = mAvailableSpace / 2 - (mIconSize * totalScale) / 2;
+        if (index == getExitIndex()) {
+            // 0 1 * <-- Exit position (row 0, col 2)
+            // 2 3
+            getGridPosition(0, 2, mTmpPoint);
+        } else if (index == getEnterIndex()) {
+            // 0 1
+            // 2 3 * <-- Enter position (row 1, col 2)
+            getGridPosition(1, 2, mTmpPoint);
+        } else if (index >= MAX_NUM_ITEMS_IN_PREVIEW) {
+            // Items beyond those displayed in the preview are animated to the center
+            mTmpPoint[0] = mTmpPoint[1] = mAvailableSpace / 2 - (mIconSize * totalScale) / 2;
         } else {
             getPosition(index, curNumItems, mTmpPoint);
-            transX = mTmpPoint[0];
-            transY = mTmpPoint[1];
         }
 
+        transX = mTmpPoint[0];
+        transY = mTmpPoint[1];
+
         if (params == null) {
             params = new PreviewItemDrawingParams(transX, transY, totalScale, overlayAlpha);
         } else {
@@ -55,6 +66,27 @@ public class ClippedFolderIconLayoutRule implements FolderIcon.PreviewLayoutRule
         return params;
     }
 
+    /**
+     * Builds a grid based on the positioning of the items when there are
+     * {@link #MAX_NUM_ITEMS_IN_PREVIEW} in the preview.
+     *
+     * Positions in the grid: 0 1  // 0 is row 0, col 1
+     *                        2 3  // 3 is row 1, col 1
+     */
+    private void getGridPosition(int row, int col, float[] result) {
+        // We use position 0 and 3 to calculate the x and y distances between items.
+        getPosition(0, 4, result);
+        float left = result[0];
+        float top = result[1];
+
+        getPosition(3, 4, result);
+        float dx = result[0] - left;
+        float dy = result[1] - top;
+
+        result[0] = left + (col * dx);
+        result[1] = top + (row * dy);
+    }
+
     private void getPosition(int index, int curNumItems, float[] result) {
         // The case of two items is homomorphic to the case of one.
         curNumItems = Math.max(curNumItems, 2);
@@ -127,4 +159,19 @@ public class ClippedFolderIconLayoutRule implements FolderIcon.PreviewLayoutRule
     public boolean clipToBackground() {
         return true;
     }
+
+    @Override
+    public boolean hasEnterExitIndices() {
+        return true;
+    }
+
+    @Override
+    public int getExitIndex() {
+        return EXIT_INDEX;
+    }
+
+    @Override
+    public int getEnterIndex() {
+        return ENTER_INDEX;
+    }
 }