content: /*
   * Copyright (C) 2014 AChep@xda <artemchep@gmail.com>
   *
   * This program 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 2
   * of the License, or (at your option) any later version.
   *
   * This program 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 this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   * MA  02110-1301, USA.
   */
  package com.achep.acdisplay.ui.widgets.notification;
  
  import android.content.Context;
  import android.graphics.Bitmap;
  import android.support.annotation.NonNull;
  import android.support.annotation.Nullable;
  import android.util.AttributeSet;
  import android.widget.ImageView;
  
  import com.achep.acdisplay.interfaces.INotificatiable;
  import com.achep.acdisplay.notifications.OpenNotification;
  
  /**
   * Created by Artem on 25.03.2014.
   */
  public class NotificationIcon extends ImageView implements
          OpenNotification.OnNotificationDataChangedListener,
          INotificatiable {
  
      /* Compat for Jelly Bean */
      private boolean mAttachedToWindow;
  
      @Nullable
      private OpenNotification mNotification;
  
      private int mIconAlpha;
      private boolean mIndicateReadState = true;
  
      public NotificationIcon(Context context) {
          super(context);
      }
  
      public NotificationIcon(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public NotificationIcon(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
      }
  
      private void registerListenerAndUpdateAll() {
          if (mNotification == null) {
              // TODO: What to do if the notification is null?
              return;
          }
  
          handleIconChanged();
          handleReadStateChanged();
          mNotification.registerListener(this);
      }
  
      private void unregisterListener() {
          if (mNotification == null) return;
  
          mNotification.unregisterListener(this);
      }
  
      @Override
      protected void onAttachedToWindow() {
          super.onAttachedToWindow();
          mAttachedToWindow = true;
          registerListenerAndUpdateAll();
      }
  
      @Override
      protected void onDetachedFromWindow() {
          mAttachedToWindow = false;
          unregisterListener();
          super.onDetachedFromWindow();
      }
  
      public void setNotificationIndicateReadStateEnabled(boolean enabled) {
          mIndicateReadState = enabled;
          if (mNotification != null) handleReadStateChanged();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setNotification(@Nullable OpenNotification notification) {
          if (mAttachedToWindow) {
              unregisterListener();
              mNotification = notification;
              registerListenerAndUpdateAll();
          } else mNotification = notification;
      }
  
      private void handleIconChanged() {
          assert mNotification != null;
          Bitmap icon = mNotification.getIcon();
          setImageBitmap(icon);
          setImageAlpha(mIconAlpha);
      }
  
      /**
       * Updates icon's alpha level to indicate is notification read or not.
       */
      private void handleReadStateChanged() {
          assert mNotification != null;
          // TODO: Move the alpha levels up to resources.
          mIconAlpha = mNotification.isRead() && mIndicateReadState ? 120 : 255;
          setImageAlpha(mIconAlpha);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void onNotificationDataChanged(@NonNull OpenNotification notification, int event) {
          switch (event) {
              case OpenNotification.EVENT_ICON:
                  handleIconChanged();
                  break;
              case OpenNotification.EVENT_READ:
                  handleReadStateChanged();
                  break;
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Nullable
      @Override
      public OpenNotification getNotification() {
          return mNotification;
      }
  
  }
  