com.momock.outlet.tab.PagerTabOutlet.java Source code

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Here is the source code for com.momock.outlet.tab.PagerTabOutlet.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.tab;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;
import android.widget.TabWidget;

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

public class PagerTabOutlet extends Outlet implements ITabOutlet {
    IDataList<IPlug> plugs;
    TabHolder target;

    public void attach(TabHolder target) {
        Logger.check(target != null, "Parameter target cannot be null!");
        Logger.check(target.getTabContent() instanceof ViewPager,
                "The PagerTabOutlet must contains a ViewPager content!");
        this.target = target;
        final TabHost tabHost = target.getTabHost();
        final ViewPager tabContent = (ViewPager) target.getTabContent();
        plugs = getPlugs();

        ViewPager pager = (ViewPager) target.getTabContent();
        for (int i = 0; i < plugs.getItemCount(); i++) {
            ITabPlug plug = (ITabPlug) plugs.getItem(i);
            Logger.check(plug.getContent() instanceof ViewHolder,
                    "The plug of PagerTabOutlet must include a ViewHolder!");
            ((ViewHolder) plug.getContent()).reset();
        }
        pager.setAdapter(new PagerAdapter() {

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

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

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

            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
                container.removeView((View) object);
            }
        });

        tabContent.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                TabWidget widget = tabHost.getTabWidget();
                int oldFocusability = widget.getDescendantFocusability();
                widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
                tabHost.setCurrentTab(position);
                widget.setDescendantFocusability(oldFocusability);
            }

            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
        tabHost.setup();
        tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {

            @Override
            public void onTabChanged(String tabId) {
                int index = tabHost.getCurrentTab();
                ITabPlug plug = (ITabPlug) plugs.getItem(index);
                setActivePlug(plug);
                tabContent.setCurrentItem(index, true);
            }
        });
        for (int i = 0; i < plugs.getItemCount(); i++) {
            final ITabPlug plug = (ITabPlug) plugs.getItem(i);
            Logger.check(plug.getContent() instanceof ViewHolder,
                    "Plug in PagerTabOutlet must contains a ViewHolder content!");

            TabHost.TabSpec spec = tabHost.newTabSpec("" + i);
            target.setTabIndicator(spec, plug);
            spec.setContent(new TabContentFactory() {

                @Override
                public View createTabContent(String tag) {
                    View v = new View(tabHost.getContext());
                    v.setMinimumWidth(0);
                    v.setMinimumHeight(0);
                    return v;
                }

            });
            tabHost.addTab(spec);
            if (getActivePlug() == plug)
                tabHost.setCurrentTab(i);
        }
    }

    @Override
    public void onActivate(IPlug plug) {
        if (((ITabPlug) plug).getContent() != null) {
            TabHost tabHost = target.getTabHost();
            tabHost.setCurrentTab(getIndexOf(plug));
        } else {
            Logger.debug("The plug of PagerTabOutlet has not been attached !");
        }
    }
}