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 FolderIconPreviewVerifier(InvariantDeviceProfile profile)37 public FolderIconPreviewVerifier(InvariantDeviceProfile profile) { 38 mMaxGridCountX = profile.numFolderColumns; 39 mMaxGridCountY = profile.numFolderRows; 40 mMaxItemsPerPage = mMaxGridCountX * mMaxGridCountY; 41 } 42 setFolderInfo(FolderInfo info)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 */ isItemInPreview(int rank)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 */ isItemInPreview(int page, int rank)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