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

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Here is the source code for com.momock.outlet.tab.FragmentPagerTabOutlet.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.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
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.app.CaseFragment;
import com.momock.app.IActiveCaseIndicator;
import com.momock.data.IDataList;
import com.momock.holder.FragmentHolder;
import com.momock.holder.FragmentTabHolder;
import com.momock.outlet.IPlug;
import com.momock.outlet.Outlet;
import com.momock.util.Logger;

public class FragmentPagerTabOutlet extends Outlet implements ITabOutlet {
    IDataList<IPlug> plugs;
    FragmentTabHolder target;

    public void attach(final FragmentTabHolder tabHolder) {
        Logger.check(tabHolder != null, "Parameter tabHolder cannot be null!");
        this.target = tabHolder;
        final TabHost tabHost = target.getTabHost();
        plugs = getPlugs();
        Logger.check(target.getTabContent() instanceof ViewPager, "The tab content container must be a ViewPager!");
        final ViewPager tabContent = (ViewPager) target.getTabContent();
        tabContent.setOffscreenPageLimit(plugs.getItemCount());
        tabContent.setAdapter(new FragmentPagerAdapter(target.getFragmentManager()) {

            @Override
            public Fragment getItem(final int position) {
                final ITabPlug plug = (ITabPlug) plugs.getItem(position);
                Fragment f = ((FragmentHolder) plug.getContent()).getFragment();
                if (f instanceof CaseFragment) {
                    CaseFragment cf = (CaseFragment) f;
                    cf.setActiveCaseIndicator(new IActiveCaseIndicator() {

                        @Override
                        public boolean isActiveCase() {
                            return getActivePlug() == plug;
                        }

                    });
                }
                return f;
            }

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

            void doFinishUpdate(ViewGroup container) {
                super.finishUpdate(container);
            }

            @Override
            public void finishUpdate(final ViewGroup container) {
                new Handler().post(new Runnable() {

                    @Override
                    public void run() {
                        doFinishUpdate(container);
                    }

                });
            }

            @Override
            public void setPrimaryItem(ViewGroup container, int position, final Object object) {
                super.setPrimaryItem(container, position, object);
                new Handler().post(new Runnable() {

                    @Override
                    public void run() {

                        if (object instanceof CaseFragment) {
                            CaseFragment cf = (CaseFragment) object;
                            if (cf.getCase() != null && cf.getCase().getParent() != null)
                                cf.getCase().getParent().setActiveCase(cf.getCase());
                        }
                    }

                });
            }
        });
        tabHost.setup();
        for (int i = 0; i < plugs.getItemCount(); i++) {
            final ITabPlug plug = (ITabPlug) plugs.getItem(i);
            Logger.check(plug.getContent() instanceof FragmentHolder,
                    "Plug in PagerTabOutlet must contains a FragmentHolder 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);
                tabContent.setCurrentItem(i, true);
            }
        }
        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);
            }
        });
        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) {

            }
        });
    }

    @Override
    public void onActivate(IPlug plug) {
        if (((ITabPlug) plug).getContent() != null && target != null) {
            TabHost tabHost = target.getTabHost();
            tabHost.setCurrentTab(getIndexOf(plug));
        }
    }
}