com.momock.outlet.card.PagerCardOutlet.java Source code

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Here is the source code for com.momock.outlet.card.PagerCardOutlet.java

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/*******************************************************************************
 * Copyright 2012 momock.com
 * 
 * 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.momock.outlet.card;

import java.lang.ref.WeakReference;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;

import com.momock.data.IDataList;
import com.momock.holder.ViewHolder;
import com.momock.outlet.IPlug;
import com.momock.outlet.Outlet;
import com.momock.util.Logger;

public class PagerCardOutlet extends Outlet implements ICardOutlet {
    WeakReference<ViewPager> refTarget = null;

    public void attach(ViewHolder target) {
        Logger.check(target.getView() instanceof ViewPager, "Parameter type error!");
        attach((ViewPager) target.getView());
    }

    public void attach(ViewPager target) {
        refTarget = new WeakReference<ViewPager>(target);
        ViewPager pager = target;
        pager.setAdapter(new PagerAdapter() {

            @Override
            public int getCount() {
                return getPlugs().getItemCount();
            }

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

            @Override
            public Object instantiateItem(ViewGroup container, int position) {
                ICardPlug plug = (ICardPlug) getPlugs().getItem(position);
                View view = ((ViewHolder) plug.getComponent()).getView();
                container.addView(view);
                return view;
            }

            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
                container.removeView((View) object);
            }
        });
        IDataList<IPlug> plugs = getPlugs();
        for (int i = 0; i < plugs.getItemCount(); i++) {
            ICardPlug plug = (ICardPlug) plugs.getItem(i);
            Logger.check(plug.getComponent() instanceof ViewHolder,
                    "The plug of PagerCardOutlet must include a ViewHolder!");
            ((ViewHolder) plug.getComponent()).reset();
            if (plug == this.getActivePlug()) {
                onActivate(plug);
            }
        }
    }

    @Override
    public void onActivate(IPlug plug) {
        if (((ICardPlug) plug).getComponent() != null) {
            ViewPager pager = refTarget.get();
            pager.setCurrentItem(getIndexOf(plug), true);
        } else {
            Logger.debug("The active plug in PagerCardOutlet has not been attached!");
        }
    }

}