au.gov.ga.worldwind.androidremote.client.ui.ItemModelFragment.java Source code

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Here is the source code for au.gov.ga.worldwind.androidremote.client.ui.ItemModelFragment.java

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/*******************************************************************************
 * Copyright 2012 Geoscience Australia
 * 
 * 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 au.gov.ga.worldwind.androidremote.client.ui;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import au.gov.ga.worldwind.androidremote.client.R;
import au.gov.ga.worldwind.androidremote.client.state.ItemModelState;
import au.gov.ga.worldwind.androidremote.client.state.ItemModelStateProvider;
import au.gov.ga.worldwind.androidremote.client.ui.menu.ItemModelFragmentMenuProvider;
import au.gov.ga.worldwind.androidremote.shared.model.Item;
import au.gov.ga.worldwind.androidremote.shared.model.ItemModel;

import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.viewpagerindicator.TitlePageIndicator;

/**
 * Fragment which displays a {@link ViewPager} (with titles using a
 * TitlePageIndicator). Pages are {@link Item}s in an {@link ItemModel}.
 * Selecting an item will push a new page into the ViewPager (handled by
 * {@link ItemModelState}).
 * 
 * @author Michael de Hoog (michael.dehoog@ga.gov.au)
 */
public class ItemModelFragment extends SherlockFragment {
    public final static String ITEM_MODEL_STATE_ID_KEY = "itemStateModelId";
    public final static String FLATTEN_KEY = "flatten";

    private ItemModelStateProvider stateProvider;
    private ItemModelState state;
    private boolean flatten;
    private Handler handler;
    private ItemModelFragmentMenuProvider menuProvider;

    public static ItemModelFragment newInstance(int itemModelStateId, boolean flatten) {
        ItemModelFragment f = new ItemModelFragment();
        Bundle arguments = new Bundle();
        arguments.putInt(ITEM_MODEL_STATE_ID_KEY, itemModelStateId);
        arguments.putBoolean(FLATTEN_KEY, flatten);
        f.setArguments(arguments);
        return f;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        if (!(activity instanceof ItemModelStateProvider)) {
            throw new IllegalArgumentException(
                    "Activity must be an instanceof " + ItemModelStateProvider.class.getSimpleName());
        }
        stateProvider = (ItemModelStateProvider) activity;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle arguments = getArguments();
        int itemModelStateId = arguments.getInt(ITEM_MODEL_STATE_ID_KEY);
        state = stateProvider.getItemModelState(itemModelStateId);
        flatten = arguments.getBoolean(FLATTEN_KEY);
        menuProvider = stateProvider.getMenuProvider(itemModelStateId);

        handler = new Handler();

        setHasOptionsMenu(menuProvider.hasOptionsMenu());
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(ITEM_MODEL_STATE_ID_KEY, state.getModel().getId());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        if (savedInstanceState != null) {
            int itemModelStateId = savedInstanceState.getInt(ITEM_MODEL_STATE_ID_KEY);
            state = stateProvider.getItemModelState(itemModelStateId);
        }

        final View view = inflater.inflate(R.layout.pager_fragment, container, false);
        final ViewPager pager = (ViewPager) view.findViewById(R.id.pager);
        final ItemModelPagerAdapter adapter = new ItemModelPagerAdapter(inflater, state, flatten);

        state.setCurrentPager(pager);
        state.setCurrentPagerAdapter(adapter);

        //prevent "java.lang.IllegalStateException: Recursive entry to executePendingTransactions"
        //by setting pager adapter after fragment transaction is complete:
        handler.post(new Runnable() {
            @Override
            public void run() {
                pager.setAdapter(adapter);
                TitlePageIndicator titles = (TitlePageIndicator) view.findViewById(R.id.titles);
                titles.setViewPager(pager);
            }
        });

        return view;
    }

    public void onBackPressed() {
        state.goBack();
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        menuProvider.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return menuProvider.onOptionsItemSelected(item);
    }
}