src/com/android/gallery3d/ingest/adapter/MtpPagerAdapter.java

/*
 * Copyright (C) 2013 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.gallery3d.ingest.adapter;

import android.content.Context;
import android.mtp.MtpObjectInfo;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.android.gallery3d.R;
import com.android.gallery3d.ingest.MtpDeviceIndex;
import com.android.gallery3d.ingest.MtpDeviceIndex.SortOrder;
import com.android.gallery3d.ingest.ui.MtpFullscreenView;

public class MtpPagerAdapter extends PagerAdapter {

    private LayoutInflater mInflater;
    private int mGeneration = 0;
    private CheckBroker mBroker;
    private MtpDeviceIndex mModel;
    private SortOrder mSortOrder = SortOrder.Descending;

    private MtpFullscreenView mReusableView = null;

    public MtpPagerAdapter(Context context, CheckBroker broker) {
        super();
        mInflater = LayoutInflater.from(context);
        mBroker = broker;
    }

    public void setMtpDeviceIndex(MtpDeviceIndex index) {
        mModel = index;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return mModel != null ? mModel.sizeWithoutLabels() : 0;
    }

    @Override
    public void notifyDataSetChanged() {
        mGeneration++;
        super.notifyDataSetChanged();
    }

    public int translatePositionWithLabels(int position) {
        if (mModel == null) return -1;
        return mModel.getPositionWithoutLabelsFromPosition(position, mSortOrder);
    }

    @Override
    public void finishUpdate(ViewGroup container) {
        mReusableView = null;
        super.finishUpdate(container);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        MtpFullscreenView v = (MtpFullscreenView)object;
        container.removeView(v);
        mBroker.unregisterOnCheckedChangeListener(v);
        mReusableView = v;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        MtpFullscreenView v;
        if (mReusableView != null) {
            v = mReusableView;
            mReusableView = null;
        } else {
            v = (MtpFullscreenView) mInflater.inflate(R.layout.ingest_fullsize, container, false);
        }
        MtpObjectInfo i = mModel.getWithoutLabels(position, mSortOrder);
        v.getImageView().setMtpDeviceAndObjectInfo(mModel.getDevice(), i, mGeneration);
        v.setPositionAndBroker(position, mBroker);
        container.addView(v);
        return v;
    }
}