session-android/src/org/thoughtcrime/securesms/components/emoji/EmojiPageView.java

package org.thoughtcrime.securesms.components.emoji;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.GridView;
import android.widget.ImageView;

import org.thoughtcrime.securesms.R;

public class EmojiPageView extends FrameLayout {
  private static final String TAG = EmojiPageView.class.getSimpleName();

  private EmojiPageModel         model;
  private EmojiSelectionListener listener;
  private GridView               grid;

  public EmojiPageView(Context context) {
    super(context);
    init();
  }

  public EmojiPageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }

  public EmojiPageView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }

  @TargetApi(VERSION_CODES.LOLLIPOP)
  public EmojiPageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    init();
  }

  public void onSelected() {
    if (model.isDynamic() && grid != null && grid.getAdapter() != null) {
      ((EmojiGridAdapter)grid.getAdapter()).notifyDataSetChanged();
    }
  }

  private void init() {
    final View view = LayoutInflater.from(getContext()).inflate(R.layout.emoji_grid_layout, this, true);
    grid = (GridView) view.findViewById(R.id.emoji);
    grid.setColumnWidth(getResources().getDimensionPixelSize(R.dimen.emoji_drawer_size) + 2 * getResources().getDimensionPixelSize(R.dimen.emoji_drawer_item_padding));
    grid.setOnItemClickListener(new OnItemClickListener() {
      @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        if (listener != null) listener.onEmojiSelected((Integer)view.getTag());
      }
    });
  }

  public void setModel(EmojiPageModel model) {
    this.model = model;
    grid.setAdapter(new EmojiGridAdapter(getContext(), model));
  }

  public void setEmojiSelectedListener(EmojiSelectionListener listener) {
    this.listener = listener;
  }

  private static class EmojiGridAdapter extends BaseAdapter {

    protected final Context        context;
    private   final int            emojiSize;
    private   final EmojiPageModel model;

    public EmojiGridAdapter(Context context, EmojiPageModel model) {
      this.context   = context;
      this.emojiSize = (int) context.getResources().getDimension(R.dimen.emoji_drawer_size);
      this.model     = model;
    }

    @Override public int getCount() {
      return model.getCodePoints().length;
    }

    @Override
    public Object getItem(int position) {
      return null;
    }

    @Override
    public long getItemId(int position) {
      return position;
    }

    @Override
    public View getView(final int position, final View convertView, final ViewGroup parent) {
      final ImageView view;
      final int pad = context.getResources().getDimensionPixelSize(R.dimen.emoji_drawer_item_padding);
      if (convertView != null && convertView instanceof ImageView) {
        view = (ImageView)convertView;
      } else {
        ImageView imageView = new ImageView(context);
        imageView.setPadding(pad, pad, pad, pad);
        imageView.setLayoutParams(new AbsListView.LayoutParams(emojiSize + 2 * pad, emojiSize + 2 * pad));
        view = imageView;
      }

      final Integer       unicodeTag = model.getCodePoints()[position];
      final EmojiProvider provider   = EmojiProvider.getInstance(context);
      final Drawable      drawable   = provider.getEmojiDrawable(unicodeTag, EmojiProvider.EMOJI_FULL);

      view.setImageDrawable(drawable);
      view.setPadding(pad, pad, pad, pad);
      view.setTag(unicodeTag);
      return view;
    }
  }

  public interface EmojiSelectionListener {
    void onEmojiSelected(int emojiCode);
  }
}