1 /* 2 * Copyright (C) 2014 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.printspooler.widget; 18 19 import android.content.Context; 20 import android.graphics.drawable.BitmapDrawable; 21 import android.graphics.drawable.Drawable; 22 import android.print.PrintAttributes.MediaSize; 23 import android.print.PrintAttributes.Margins; 24 import android.util.AttributeSet; 25 import android.view.View; 26 import com.android.printspooler.model.PageContentRepository; 27 import com.android.printspooler.model.PageContentRepository.RenderSpec; 28 import com.android.printspooler.model.PageContentRepository.PageContentProvider; 29 30 /** 31 * This class represents a page in the print preview list. The width of the page 32 * is determined by stretching it to take maximal horizontal space while the height 33 * is computed from the width using the page aspect ratio. Note that different media 34 * sizes have different aspect ratios. 35 */ 36 public class PageContentView extends View 37 implements PageContentRepository.OnPageContentAvailableCallback { 38 39 private PageContentProvider mProvider; 40 41 private MediaSize mMediaSize; 42 43 private Margins mMinMargins; 44 45 private Drawable mEmptyState; 46 47 private Drawable mErrorState; 48 49 private boolean mContentRequested; 50 51 private boolean mIsFailed; 52 PageContentView(Context context, AttributeSet attrs)53 public PageContentView(Context context, AttributeSet attrs) { 54 super(context, attrs); 55 } 56 57 @Override onSizeChanged(int w, int h, int oldw, int oldh)58 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 59 mContentRequested = false; 60 61 requestPageContentIfNeeded(); 62 } 63 64 @Override onPageContentAvailable(BitmapDrawable renderedPage)65 public void onPageContentAvailable(BitmapDrawable renderedPage) { 66 mIsFailed = (renderedPage == null); 67 68 if (mIsFailed) { 69 setBackground(mErrorState); 70 } else { 71 setBackground(renderedPage); 72 } 73 } 74 getPageContentProvider()75 public PageContentProvider getPageContentProvider() { 76 return mProvider; 77 } 78 init(PageContentProvider provider, Drawable emptyState, Drawable errorState, MediaSize mediaSize, Margins minMargins)79 public void init(PageContentProvider provider, Drawable emptyState, Drawable errorState, 80 MediaSize mediaSize, Margins minMargins) { 81 final boolean providerChanged = (mProvider == null) 82 ? provider != null : !mProvider.equals(provider); 83 final boolean loadingDrawableChanged = (mEmptyState == null) 84 ? emptyState != null : !mEmptyState.equals(emptyState); 85 final boolean mediaSizeChanged = (mMediaSize == null) 86 ? mediaSize != null : !mMediaSize.equals(mediaSize); 87 final boolean marginsChanged = (mMinMargins == null) 88 ? minMargins != null : !mMinMargins.equals(minMargins); 89 90 if (!providerChanged && !mediaSizeChanged 91 && !marginsChanged && !loadingDrawableChanged) { 92 return; 93 } 94 95 mIsFailed = false; 96 mProvider = provider; 97 mMediaSize = mediaSize; 98 mMinMargins = minMargins; 99 100 mEmptyState = emptyState; 101 mErrorState = errorState; 102 mContentRequested = false; 103 104 // If there is no provider we want immediately to switch to 105 // the empty state, so pages with no content appear blank. 106 if (mProvider == null) { 107 setBackground(mEmptyState); 108 } else if (mIsFailed) { 109 setBackground(mErrorState); 110 } 111 112 requestPageContentIfNeeded(); 113 } 114 requestPageContentIfNeeded()115 private void requestPageContentIfNeeded() { 116 if (getWidth() > 0 && getHeight() > 0 && !mContentRequested 117 && mProvider != null) { 118 mContentRequested = true; 119 mProvider.getPageContent(new RenderSpec(getWidth(), getHeight(), 120 mMediaSize, mMinMargins), this); 121 } 122 } 123 } 124