MainActivity.java

/***
  Copyright (c) 2013 CommonsWare, LLC
  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.
  
  Covered in detail in the book _The Busy Coder's Guide to Android Development_
    https://commonsware.com/Android
 */

package com.commonsware.android.preso.slides;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Display;
import android.view.Menu;
import android.view.MenuItem;
import com.commonsware.cwac.preso.PresentationHelper;
import com.viewpagerindicator.TabPageIndicator;

public class MainActivity extends Activity implements
    PresentationHelper.Listener, OnPageChangeListener {
  private ViewPager pager=null;
  private SlidePresentationFragment preso=null;
  private SlidesAdapter adapter=null;
  private PresentationHelper helper=null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    TabPageIndicator tabs=(TabPageIndicator)findViewById(R.id.titles);

    pager=(ViewPager)findViewById(R.id.pager);
    adapter=new SlidesAdapter(this);
    pager.setAdapter(adapter);
    tabs.setViewPager(pager);
    tabs.setOnPageChangeListener(this);

    helper=new PresentationHelper(this, this);
  }

  @Override
  public void onResume() {
    super.onResume();
    helper.onResume();
  }

  @Override
  public void onPause() {
    helper.onPause();
    super.onPause();
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_actions, menu);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case R.id.present:
        boolean original=item.isChecked();

        item.setChecked(!original);

        if (original) {
          helper.disable();
        }
        else {
          helper.enable();
        }

        break;

      case R.id.first:
        pager.setCurrentItem(0);
        break;

      case R.id.last:
        pager.setCurrentItem(adapter.getCount() - 1);
        break;
    }

    return(super.onOptionsItemSelected(item));
  }

  @Override
  public void onPageScrollStateChanged(int arg0) {
    // ignored
  }

  @Override
  public void onPageScrolled(int arg0, float arg1, int arg2) {
    // ignored
  }

  @Override
  public void onPageSelected(int position) {
    if (preso != null) {
      preso.setSlideContent(adapter.getPageResource(position));
    }
  }

  @Override
  public void clearPreso(boolean showInline) {
    if (preso != null) {
      preso.dismiss();
      preso=null;
    }
  }

  @Override
  public void showPreso(Display display) {
    int drawable=adapter.getPageResource(pager.getCurrentItem());

    preso=
        SlidePresentationFragment.newInstance(this, display, drawable);
    preso.show(getFragmentManager(), "preso");
  }
}