1 files changed, 64 insertions, 0 deletions
diff --git a/src/com/android/launcher3/folder/FolderIconPreviewVerifier.java b/src/com/android/launcher3/folder/FolderIconPreviewVerifier.java
new file mode 100644
index 000000000..de962b021
--- /dev/null
+++ b/src/com/android/launcher3/folder/FolderIconPreviewVerifier.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.folder;
+
+import com.android.launcher3.FolderInfo;
+import com.android.launcher3.InvariantDeviceProfile;
+import com.android.launcher3.config.FeatureFlags;
+
+/**
+ * Verifies whether an item in a Folder is displayed in the FolderIcon preview.
+ */
+public class FolderIconPreviewVerifier {
+
+    private final int mMaxGridCountX;
+    private final int mMaxGridCountY;
+    private final int mMaxItemsPerPage;
+    private final int[] mGridSize = new int[2];
+
+    private int mGridCountX;
+    private boolean mDisplayingUpperLeftQuadrant = false;
+
+    public FolderIconPreviewVerifier(InvariantDeviceProfile profile) {
+        mMaxGridCountX = profile.numFolderColumns;
+        mMaxGridCountY = profile.numFolderRows;
+        mMaxItemsPerPage = mMaxGridCountX * mMaxGridCountY;
+    }
+
+    public void setFolderInfo(FolderInfo info) {
+        int numItemsInFolder = info.contents.size();
+        mDisplayingUpperLeftQuadrant = FeatureFlags.LAUNCHER3_NEW_FOLDER_ANIMATION
+                && !FeatureFlags.LAUNCHER3_LEGACY_FOLDER_ICON
+                && numItemsInFolder > FolderIcon.NUM_ITEMS_IN_PREVIEW;
+
+        if (mDisplayingUpperLeftQuadrant) {
+            FolderPagedView.calculateGridSize(info.contents.size(), 0, 0, mMaxGridCountX,
+                    mMaxGridCountY, mMaxItemsPerPage, mGridSize);
+            mGridCountX = mGridSize[0];
+        }
+    }
+
+    public boolean isItemInPreview(int rank) {
+        if (mDisplayingUpperLeftQuadrant) {
+            // Returns true iff the icon is in the 2x2 upper left quadrant of the Folder.
+            int col = rank % mGridCountX;
+            int row = rank / mGridCountX;
+            return col < 2 && row < 2;
+        }
+        return rank < FolderIcon.NUM_ITEMS_IN_PREVIEW;
+    }
+}