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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher3.folder;
     18 
     19 import com.android.launcher3.FolderInfo;
     20 import com.android.launcher3.InvariantDeviceProfile;
     21 
     22 import static com.android.launcher3.folder.ClippedFolderIconLayoutRule.MAX_NUM_ITEMS_IN_PREVIEW;
     23 
     24 /**
     25  * Verifies whether an item in a Folder is displayed in the FolderIcon preview.
     26  */
     27 public class FolderIconPreviewVerifier {
     28 
     29     private final int mMaxGridCountX;
     30     private final int mMaxGridCountY;
     31     private final int mMaxItemsPerPage;
     32     private final int[] mGridSize = new int[2];
     33 
     34     private int mGridCountX;
     35     private boolean mDisplayingUpperLeftQuadrant = false;
     36 
     37     public FolderIconPreviewVerifier(InvariantDeviceProfile profile) {
     38         mMaxGridCountX = profile.numFolderColumns;
     39         mMaxGridCountY = profile.numFolderRows;
     40         mMaxItemsPerPage = mMaxGridCountX * mMaxGridCountY;
     41     }
     42 
     43     public void setFolderInfo(FolderInfo info) {
     44         int numItemsInFolder = info.contents.size();
     45         FolderPagedView.calculateGridSize(numItemsInFolder, 0, 0, mMaxGridCountX,
     46                 mMaxGridCountY, mMaxItemsPerPage, mGridSize);
     47         mGridCountX = mGridSize[0];
     48 
     49         mDisplayingUpperLeftQuadrant = numItemsInFolder > MAX_NUM_ITEMS_IN_PREVIEW;
     50     }
     51 
     52     /**
     53      * Returns whether the item with {@param rank} is in the default Folder icon preview.
     54      */
     55     public boolean isItemInPreview(int rank) {
     56         return isItemInPreview(0, rank);
     57     }
     58 
     59     /**
     60      * @param page The page the item is on.
     61      * @param rank The rank of the item.
     62      * @return True iff the icon is in the 2x2 upper left quadrant of the Folder.
     63      */
     64     public boolean isItemInPreview(int page, int rank) {
     65         // First page items are laid out such that the first 4 items are always in the upper
     66         // left quadrant. For all other pages, we need to check the row and col.
     67         if (page > 0 || mDisplayingUpperLeftQuadrant) {
     68             int col = rank % mGridCountX;
     69             int row = rank / mGridCountX;
     70             return col < 2 && row < 2;
     71         }
     72         return rank < MAX_NUM_ITEMS_IN_PREVIEW;
     73     }
     74 }
     75