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package com.artifex.mupdfdemo;
import android.content.Context;
import android.graphics.Point;
import android.graphics.PointF;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
public class MuPDFPageAdapter extends BaseAdapter {
private final Context mContext;
private final MuPDFCore mCore;
private final SparseArray<PointF> mPageSizes = new SparseArray<PointF>();
public MuPDFPageAdapter(Context c, MuPDFCore core) {
mContext = c;
mCore = core;
}
public int getCount() {
return mCore.countPages();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
final MuPDFPageView pageView;
if (convertView == null) {
pageView = new MuPDFPageView(mContext, mCore, new Point(parent.getWidth(), parent.getHeight()));
} else {
pageView = (MuPDFPageView) convertView;
}
PointF pageSize = mPageSizes.get(position);
if (pageSize != null) {
// We already know the page size. Set it up
// immediately
pageView.setPage(position, pageSize);
} else {
// Page size as yet unknown. Blank it for now, and
// start a background task to find the size
pageView.blank(position);
AsyncTask<Void,Void,PointF> sizingTask = new AsyncTask<Void,Void,PointF>() {
@Override
protected PointF doInBackground(Void... arg0) {
return mCore.getPageSize(position);
}
@Override
protected void onPostExecute(PointF result) {
super.onPostExecute(result);
// We now know the page size
mPageSizes.put(position, result);
// Check that this view hasn't been reused for
// another page since we started
if (pageView.getPage() == position)
pageView.setPage(position, result);
}
};
sizingTask.execute((Void)null);
}
return pageView;
}
}
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