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/*
* 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.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.print.PrintAttributes.MediaSize;
import android.print.PrintAttributes.Margins;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import com.android.printspooler.model.PageContentRepository;
import com.android.printspooler.model.PageContentRepository.PageContentProvider;
import com.android.printspooler.model.PageContentRepository.RenderSpec;
/**
* 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 final ColorDrawable mEmptyState;
private PageContentProvider mProvider;
private MediaSize mMediaSize;
private Margins mMinMargins;
private boolean mContentRequested;
public PageContentView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedValue typedValue = new TypedValue();
context.getTheme().resolveAttribute(com.android.internal.R.attr.textColorPrimary,
typedValue, true);
mEmptyState = new ColorDrawable(typedValue.data);
setBackground(mEmptyState);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
requestPageContentIfNeeded();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
requestPageContentIfNeeded();
}
@Override
public void onPageContentAvailable(BitmapDrawable content) {
if (getBackground() != content) {
setBackground(content);
}
}
public PageContentProvider getPageContentProvider() {
return mProvider;
}
public void init(PageContentProvider provider, MediaSize mediaSize, Margins minMargins) {
if (mProvider == provider
&& ((mMediaSize == null) ? mediaSize == null : mMediaSize.equals(mediaSize))
&& ((mMinMargins == null) ? minMargins == null : mMinMargins.equals(minMargins))) {
return;
}
mProvider = provider;
mMediaSize = mediaSize;
mMinMargins = minMargins;
mContentRequested = false;
// If there is not provider we want immediately to switch to
// the empty state, so pages with no content appear blank.
if (mProvider == null && getBackground() != mEmptyState) {
setBackground(mEmptyState);
}
requestPageContentIfNeeded();
}
private void requestPageContentIfNeeded() {
if (getWidth() > 0 && getHeight() > 0 && !mContentRequested && mProvider != null) {
mContentRequested = true;
mProvider.getPageContent(new RenderSpec(getWidth(), getHeight(), mMediaSize,
mMinMargins), this);
}
}
}
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