Android Open Source - sigilui Accordion

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Back to project page sigilui.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * This file is part of sigilui/*from w  w  w . ja v a  2  s .  c o  m*/
 *
 * Sigilui is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Sigilui is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.sigil.ui.widget;

import android.app.*;
import android.content.*;
import android.view.*;
import android.widget.*;
import android.util.*;
import java.util.*;

/**
 * Class to manage an accordion
 */
public class Accordion implements View.OnClickListener {

  private static final String TAG = ""+Accordion.class;

  protected final Activity _activity;
  protected final int _scrollViewId;
  protected final int _expandId;
  protected final int _contractId;
  protected final Map<Button,Integer> _buttons;

  /**
   * Constructor 
   *
   * @param activity the parent activity holding the accordion
   */
  public Accordion( Activity activity ) {
    this( activity, -1 );
  }

  /**
   * Constructor 
   *
   * @param activity the parent activity holding the accordion
   * @param scrollViewId the optional ID of a parent ScrollView. If provided, expanding an element
   * will scroll to the top of the button activating the element
   */
  public Accordion( Activity activity, int scrollViewId ) {
    this( activity, scrollViewId, -1, -1 );
  }

  /**
   * Constructor 
   *
   * @param activity the parent activity holding the accordion
   * @param scrollViewId the optional ID of a parent ScrollView. If provided, expanding an element
   * will scroll to the top of the button activating the element
   * @param expandId resource ID for an icon to display on the left of a button which can be
   * expanded
   * @param contractId resource ID for an icon to display on the left of a button which can be
   * contracted
   */
  public Accordion( Activity activity, int scrollViewId, int expandId, int contractId ) {
    _activity = activity;
    _buttons = new HashMap<>(16);
    _scrollViewId = scrollViewId;
    _expandId = expandId;
    _contractId = contractId;
  }

  /**
   * Adds a button to the accordion
   *
   * @param buttonViewId the ID of the button view
   * @param viewId the ID of the associated view
   */
  public void add( int buttonViewId, int viewId ) {
    Button b = (Button)_activity.findViewById( buttonViewId );
    if ( null == b ) {
      throw new IllegalStateException( "Cannot find Button with ID "+buttonViewId );
    }
    _buttons.put( b, viewId );
    b.setOnClickListener( this );
  }

  /**
   * Called when a button is clicked
   */
  @Override
  public void onClick( View view ) {
    Integer id = _buttons.get( view );
    if ( null == id ) {
      Log.w( TAG, "Could not find view matching "+view );
      return;
    }
    View v = _activity.findViewById( id );
    if ( null == v ) {
      Log.w( TAG, "Could not find view with ID "+id );
      return;
    }
    ScrollView scrollView = null;
    if ( -1 != _scrollViewId ) {
      scrollView = (ScrollView)_activity.findViewById( _scrollViewId );
      if ( null == scrollView ) {
        Log.w( TAG, "Could not find ScrollView for ID "+_scrollViewId );
      }
    }

    Button button = (Button)view;
    int[] loc = new int[2];
    view.getLocationOnScreen( loc );
    if ( v.getVisibility() == View.VISIBLE ) {
      // hide it
      v.setVisibility( View.GONE );
      if ( -1 != _expandId ) {
        button.setCompoundDrawablesWithIntrinsicBounds( _expandId, 0, 0, 0 );
      }

      // don't scroll if hiding all items
      loc[0] = -1;
    } else {

      // show it
      v.setVisibility( View.VISIBLE );
      if ( -1 != _contractId ) {
        button.setCompoundDrawablesWithIntrinsicBounds( _contractId, 0, 0, 0 );
      }

      // hide the rest
      for ( Map.Entry<Button,Integer> entry : _buttons.entrySet()) {

        Button b = entry.getKey();
        if ( b == button ) {
          continue;
        }

        View v2 = _activity.findViewById( entry.getValue() );
        if ( null == v2 ) {
          Log.w( TAG, "Could not find view with ID "+entry.getValue() );
          continue;
        }
        v2.setVisibility( View.GONE );
        if ( -1 != _expandId ) {
          b.setCompoundDrawablesWithIntrinsicBounds( _expandId, 0, 0, 0 );
        }
      }
    }

    Log.i( TAG, "onClick(): scrollview="+scrollView+", x="+loc[0]+", y="+loc[1] );
    if ( null != scrollView && loc[0] > -1 ) {
      final ScrollView sv = scrollView;
      final int y = loc[1];
      scrollView.post( new Runnable() { public void run() { sv.smoothScrollTo( 0, y ); } });
    }
  }

}

Java Source Code List

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