Android Open Source - photo-picker-plus-android Merge Adapter

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License

The source code is released under:
MIT License
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Java Source Code

/**
 * The MIT License (MIT)//from   w ww. ja va2s .  co m

Copyright (c) 2013 Chute

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.getchute.android.photopickerplus.ui.adapter;

import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.SectionIndexer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Adapter that merges multiple child adapters and views into a single
 * contiguous whole.
 * 
 * Adapters used as pieces within MergeAdapter must have view type IDs
 * monotonically increasing from 0. Ideally, adapters also have distinct ranges
 * for their row ids, as returned by getItemId().
 * 
 */
public class MergeAdapter extends BaseAdapter implements SectionIndexer {
  protected PieceStateRoster pieces = new PieceStateRoster();

  /**
   * Stock constructor, simply chaining to the superclass.
   */
  public MergeAdapter() {
    super();
  }

  /**
   * Adds a new adapter to the roster of things to appear in the aggregate
   * list.
   * 
   * @param adapter
   *            Source for row views for this section
   */
  public void addAdapter(ListAdapter adapter) {
    pieces.add(adapter);
    adapter.registerDataSetObserver(new CascadeDataSetObserver());
  }

  /**
   * Adds a new View to the roster of things to appear in the aggregate list.
   * 
   * @param view
   *            Single view to add
   */
  public void addView(View view) {
    addView(view, false);
  }

  /**
   * Adds a new View to the roster of things to appear in the aggregate list.
   * 
   * @param view
   *            Single view to add
   * @param enabled
   *            false if views are disabled, true if enabled
   */
  public void addView(View view, boolean enabled) {
    ArrayList<View> list = new ArrayList<View>(1);

    list.add(view);

    addViews(list, enabled);
  }

  /**
   * Adds a list of views to the roster of things to appear in the aggregate
   * list.
   * 
   * @param views
   *            List of views to add
   */
  public void addViews(List<View> views) {
    addViews(views, false);
  }

  /**
   * Adds a list of views to the roster of things to appear in the aggregate
   * list.
   * 
   * @param views
   *            List of views to add
   * @param enabled
   *            false if views are disabled, true if enabled
   */
  public void addViews(List<View> views, boolean enabled) {
    if (enabled) {
      addAdapter(new EnabledSackAdapter(views));
    } else {
      addAdapter(new SackOfViewsAdapter(views));
    }
  }

  /**
   * Get the data item associated with the specified position in the data set.
   * 
   * @param position
   *            Position of the item whose data we want
   */
  @Override
  public Object getItem(int position) {
    for (ListAdapter piece : getPieces()) {
      int size = piece.getCount();

      if (position < size) {
        return (piece.getItem(position));
      }

      position -= size;
    }

    return (null);
  }

  /**
   * Get the adapter associated with the specified position in the data set.
   * 
   * @param position
   *            Position of the item whose adapter we want
   */
  public ListAdapter getAdapter(int position) {
    for (ListAdapter piece : getPieces()) {
      int size = piece.getCount();

      if (position < size) {
        return (piece);
      }

      position -= size;
    }

    return (null);
  }

  /**
   * How many items are in the data set represented by this Adapter.
   */
  @Override
  public int getCount() {
    int total = 0;

    for (ListAdapter piece : getPieces()) {
      total += piece.getCount();
    }

    return (total);
  }

  /**
   * Returns the number of types of Views that will be created by getView().
   */
  @Override
  public int getViewTypeCount() {
    int total = 0;

    for (PieceState piece : pieces.getRawPieces()) {
      total += piece.adapter.getViewTypeCount();
    }

    return (Math.max(total, 1)); // needed for
                    // setListAdapter() before
                    // content add'
  }

  /**
   * Get the type of View that will be created by getView() for the specified
   * item.
   * 
   * @param position
   *            Position of the item whose data we want
   */
  @Override
  public int getItemViewType(int position) {
    int typeOffset = 0;
    int result = -1;

    for (PieceState piece : pieces.getRawPieces()) {
      if (piece.isActive) {
        int size = piece.adapter.getCount();

        if (position < size) {
          result = typeOffset
              + piece.adapter.getItemViewType(position);
          break;
        }

        position -= size;
      }

      typeOffset += piece.adapter.getViewTypeCount();
    }

    return (result);
  }

  /**
   * Are all items in this ListAdapter enabled? If yes it means all items are
   * selectable and clickable.
   */
  @Override
  public boolean areAllItemsEnabled() {
    return (false);
  }

  /**
   * Returns true if the item at the specified position is not a separator.
   * 
   * @param position
   *            Position of the item whose data we want
   */
  @Override
  public boolean isEnabled(int position) {
    for (ListAdapter piece : getPieces()) {
      int size = piece.getCount();

      if (position < size) {
        return (piece.isEnabled(position));
      }

      position -= size;
    }

    return (false);
  }

  /**
   * Get a View that displays the data at the specified position in the data
   * set.
   * 
   * @param position
   *            Position of the item whose data we want
   * @param convertView
   *            View to recycle, if not null
   * @param parent
   *            ViewGroup containing the returned View
   */
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    for (ListAdapter piece : getPieces()) {
      int size = piece.getCount();

      if (position < size) {

        return (piece.getView(position, convertView, parent));
      }

      position -= size;
    }

    return (null);
  }

  /**
   * Get the row id associated with the specified position in the list.
   * 
   * @param position
   *            Position of the item whose data we want
   */
  @Override
  public long getItemId(int position) {
    for (ListAdapter piece : getPieces()) {
      int size = piece.getCount();

      if (position < size) {
        return (piece.getItemId(position));
      }

      position -= size;
    }

    return (-1);
  }

  @Override
  public int getPositionForSection(int section) {
    int position = 0;

    for (ListAdapter piece : getPieces()) {
      if (piece instanceof SectionIndexer) {
        Object[] sections = ((SectionIndexer) piece).getSections();
        int numSections = 0;

        if (sections != null) {
          numSections = sections.length;
        }

        if (section < numSections) {
          return (position + ((SectionIndexer) piece)
              .getPositionForSection(section));
        } else if (sections != null) {
          section -= numSections;
        }
      }

      position += piece.getCount();
    }

    return (0);
  }

  @Override
  public int getSectionForPosition(int position) {
    int section = 0;

    for (ListAdapter piece : getPieces()) {
      int size = piece.getCount();

      if (position < size) {
        if (piece instanceof SectionIndexer) {
          return (section + ((SectionIndexer) piece)
              .getSectionForPosition(position));
        }

        return (0);
      } else {
        if (piece instanceof SectionIndexer) {
          Object[] sections = ((SectionIndexer) piece).getSections();

          if (sections != null) {
            section += sections.length;
          }
        }
      }

      position -= size;
    }

    return (0);
  }

  @Override
  public Object[] getSections() {
    ArrayList<Object> sections = new ArrayList<Object>();

    for (ListAdapter piece : getPieces()) {
      if (piece instanceof SectionIndexer) {
        Object[] curSections = ((SectionIndexer) piece).getSections();

        if (curSections != null) {
          Collections.addAll(sections, curSections);
        }
      }
    }

    if (sections.size() == 0) {
      return (new String[0]);
    }

    return (sections.toArray(new Object[0]));
  }

  public void setActive(ListAdapter adapter, boolean isActive) {
    pieces.setActive(adapter, isActive);
    notifyDataSetChanged();
  }

  public void setActive(View v, boolean isActive) {
    pieces.setActive(v, isActive);
    notifyDataSetChanged();
  }

  protected List<ListAdapter> getPieces() {
    return (pieces.getPieces());
  }

  private static class PieceState {
    ListAdapter adapter;
    boolean isActive = true;

    PieceState(ListAdapter adapter, boolean isActive) {
      this.adapter = adapter;
      this.isActive = isActive;
    }
  }

  private static class PieceStateRoster {
    protected ArrayList<PieceState> pieces = new ArrayList<PieceState>();
    protected ArrayList<ListAdapter> active = null;

    void add(ListAdapter adapter) {
      pieces.add(new PieceState(adapter, true));
    }

    void setActive(ListAdapter adapter, boolean isActive) {
      for (PieceState state : pieces) {
        if (state.adapter == adapter) {
          state.isActive = isActive;
          active = null;
          break;
        }
      }
    }

    void setActive(View v, boolean isActive) {
      for (PieceState state : pieces) {
        if (state.adapter instanceof SackOfViewsAdapter
            && ((SackOfViewsAdapter) state.adapter).hasView(v)) {
          state.isActive = isActive;
          active = null;
          break;
        }
      }
    }

    List<PieceState> getRawPieces() {
      return (pieces);
    }

    List<ListAdapter> getPieces() {
      if (active == null) {
        active = new ArrayList<ListAdapter>();

        for (PieceState state : pieces) {
          if (state.isActive) {
            active.add(state.adapter);
          }
        }
      }

      return (active);
    }
  }

  private static class EnabledSackAdapter extends SackOfViewsAdapter {
    public EnabledSackAdapter(List<View> views) {
      super(views);
    }

    @Override
    public boolean areAllItemsEnabled() {
      return (true);
    }

    @Override
    public boolean isEnabled(int position) {
      return (true);
    }
  }

  private class CascadeDataSetObserver extends DataSetObserver {
    @Override
    public void onChanged() {
      notifyDataSetChanged();
    }

    @Override
    public void onInvalidated() {
      notifyDataSetInvalidated();
    }
  }
}
Java Source Code List
