1 /* 2 * Copyright (C) 2011 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package com.android.ex.photo.adapters; 19 20 import android.content.Context; 21 import android.content.Intent; 22 import android.database.Cursor; 23 import androidx.fragment.app.Fragment; 24 import androidx.collection.SimpleArrayMap; 25 26 import com.android.ex.photo.Intents; 27 import com.android.ex.photo.Intents.PhotoViewIntentBuilder; 28 import com.android.ex.photo.fragments.PhotoViewFragment; 29 import com.android.ex.photo.provider.PhotoContract.PhotoViewColumns; 30 import com.android.ex.photo.provider.PhotoContract.PhotoQuery; 31 32 /** 33 * Pager adapter for the photo view 34 */ 35 public class PhotoPagerAdapter extends BaseCursorPagerAdapter { 36 protected SimpleArrayMap<String, Integer> mColumnIndices = 37 new SimpleArrayMap<String, Integer>(PhotoQuery.PROJECTION.length); 38 protected final float mMaxScale; 39 protected boolean mDisplayThumbsFullScreen; 40 PhotoPagerAdapter( Context context, androidx.fragment.app.FragmentManager fm, Cursor c, float maxScale, boolean thumbsFullScreen)41 public PhotoPagerAdapter( 42 Context context, androidx.fragment.app.FragmentManager fm, Cursor c, 43 float maxScale, boolean thumbsFullScreen) { 44 super(context, fm, c); 45 mMaxScale = maxScale; 46 mDisplayThumbsFullScreen = thumbsFullScreen; 47 } 48 49 @Override getItem(Context context, Cursor cursor, int position)50 public Fragment getItem(Context context, Cursor cursor, int position) { 51 final String photoUri = getPhotoUri(cursor); 52 final String thumbnailUri = getThumbnailUri(cursor); 53 final String contentDescription = getPhotoName(cursor); 54 boolean loading = shouldShowLoadingIndicator(cursor); 55 boolean onlyShowSpinner = false; 56 if(photoUri == null && loading) { 57 onlyShowSpinner = true; 58 } 59 60 // create new PhotoViewFragment 61 final PhotoViewIntentBuilder builder = 62 Intents.newPhotoViewFragmentIntentBuilder(mContext, getPhotoViewFragmentClass()); 63 builder 64 .setResolvedPhotoUri(photoUri) 65 .setThumbnailUri(thumbnailUri) 66 .setContentDescription(contentDescription) 67 .setDisplayThumbsFullScreen(mDisplayThumbsFullScreen) 68 .setMaxInitialScale(mMaxScale); 69 70 return createPhotoViewFragment(builder.build(), position, onlyShowSpinner); 71 } 72 getPhotoViewFragmentClass()73 protected Class<? extends PhotoViewFragment> getPhotoViewFragmentClass() { 74 return PhotoViewFragment.class; 75 } 76 createPhotoViewFragment( Intent intent, int position, boolean onlyShowSpinner)77 protected PhotoViewFragment createPhotoViewFragment( 78 Intent intent, int position, boolean onlyShowSpinner) { 79 return PhotoViewFragment.newInstance(intent, position, onlyShowSpinner); 80 } 81 82 @Override swapCursor(Cursor newCursor)83 public Cursor swapCursor(Cursor newCursor) { 84 mColumnIndices.clear(); 85 86 if (newCursor != null) { 87 for(String column : PhotoQuery.PROJECTION) { 88 mColumnIndices.put(column, newCursor.getColumnIndexOrThrow(column)); 89 } 90 91 for(String column : PhotoQuery.OPTIONAL_COLUMNS) { 92 int index = newCursor.getColumnIndex(column); 93 if (index != -1) { 94 mColumnIndices.put(column, index); 95 } 96 } 97 } 98 99 return super.swapCursor(newCursor); 100 } 101 getPhotoUri(Cursor cursor)102 public String getPhotoUri(Cursor cursor) { 103 return getString(cursor, PhotoViewColumns.CONTENT_URI); 104 } 105 getThumbnailUri(Cursor cursor)106 public String getThumbnailUri(Cursor cursor) { 107 return getString(cursor, PhotoViewColumns.THUMBNAIL_URI); 108 } 109 getContentType(Cursor cursor)110 public String getContentType(Cursor cursor) { 111 return getString(cursor, PhotoViewColumns.CONTENT_TYPE); 112 } 113 getPhotoName(Cursor cursor)114 public String getPhotoName(Cursor cursor) { 115 return getString(cursor, PhotoViewColumns.NAME); 116 } 117 shouldShowLoadingIndicator(Cursor cursor)118 public boolean shouldShowLoadingIndicator(Cursor cursor) { 119 String value = getString(cursor, PhotoViewColumns.LOADING_INDICATOR); 120 if (value == null) { 121 return false; 122 } else { 123 return Boolean.parseBoolean(value); 124 } 125 } 126 getString(Cursor cursor, String column)127 private String getString(Cursor cursor, String column) { 128 if (mColumnIndices.containsKey(column)) { 129 return cursor.getString(mColumnIndices.get(column)); 130 } else { 131 return null; 132 } 133 } 134 } 135