| /* |
| * Copyright (C) 2014 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.printspooler.widget; |
| |
| import android.content.Context; |
| import android.graphics.drawable.BitmapDrawable; |
| import android.graphics.drawable.Drawable; |
| import android.print.PrintAttributes.MediaSize; |
| import android.print.PrintAttributes.Margins; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import com.android.printspooler.model.PageContentRepository; |
| import com.android.printspooler.model.PageContentRepository.RenderSpec; |
| import com.android.printspooler.model.PageContentRepository.PageContentProvider; |
| |
| /** |
| * This class represents a page in the print preview list. The width of the page |
| * is determined by stretching it to take maximal horizontal space while the height |
| * is computed from the width using the page aspect ratio. Note that different media |
| * sizes have different aspect ratios. |
| */ |
| public class PageContentView extends View |
| implements PageContentRepository.OnPageContentAvailableCallback { |
| |
| private PageContentProvider mProvider; |
| |
| private MediaSize mMediaSize; |
| |
| private Margins mMinMargins; |
| |
| private Drawable mEmptyState; |
| |
| private Drawable mErrorState; |
| |
| private boolean mContentRequested; |
| |
| private boolean mIsFailed; |
| |
| public PageContentView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| @Override |
| protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| mContentRequested = false; |
| |
| requestPageContentIfNeeded(); |
| } |
| |
| @Override |
| public void onPageContentAvailable(BitmapDrawable renderedPage) { |
| mIsFailed = (renderedPage == null); |
| |
| if (mIsFailed) { |
| setBackground(mErrorState); |
| } else { |
| setBackground(renderedPage); |
| } |
| } |
| |
| public PageContentProvider getPageContentProvider() { |
| return mProvider; |
| } |
| |
| public void init(PageContentProvider provider, Drawable emptyState, Drawable errorState, |
| MediaSize mediaSize, Margins minMargins) { |
| final boolean providerChanged = (mProvider == null) |
| ? provider != null : !mProvider.equals(provider); |
| final boolean loadingDrawableChanged = (mEmptyState == null) |
| ? emptyState != null : !mEmptyState.equals(emptyState); |
| final boolean mediaSizeChanged = (mMediaSize == null) |
| ? mediaSize != null : !mMediaSize.equals(mediaSize); |
| final boolean marginsChanged = (mMinMargins == null) |
| ? minMargins != null : !mMinMargins.equals(minMargins); |
| |
| if (!providerChanged && !mediaSizeChanged |
| && !marginsChanged && !loadingDrawableChanged) { |
| return; |
| } |
| |
| mIsFailed = false; |
| mProvider = provider; |
| mMediaSize = mediaSize; |
| mMinMargins = minMargins; |
| |
| mEmptyState = emptyState; |
| mErrorState = errorState; |
| mContentRequested = false; |
| |
| // If there is no provider we want immediately to switch to |
| // the empty state, so pages with no content appear blank. |
| if (mProvider == null) { |
| setBackground(mEmptyState); |
| } else if (mIsFailed) { |
| setBackground(mErrorState); |
| } |
| |
| requestPageContentIfNeeded(); |
| } |
| |
| private void requestPageContentIfNeeded() { |
| if (getWidth() > 0 && getHeight() > 0 && !mContentRequested |
| && mProvider != null) { |
| mContentRequested = true; |
| mProvider.getPageContent(new RenderSpec(getWidth(), getHeight(), |
| mMediaSize, mMinMargins), this); |
| } |
| } |
| } |