Android Open Source - opensudoku Hints Queue

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License

The source code is released under:

GNU General Public License

Java Source Code

/* 
 * Copyright (C) 2009 Roman Masek//w ww.j a v  a2  s . c  o  m
 * 
 * This file is part of OpenSudoku.
 * 
 * OpenSudoku 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.
 * 
 * OpenSudoku 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 OpenSudoku.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package org.moire.opensudoku.gui;

import java.util.LinkedList;
import java.util.Queue;

import org.moire.opensudoku.R;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnDismissListener;
import android.content.SharedPreferences.Editor;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.preference.PreferenceManager;

public class HintsQueue {
  // TODO: should be persisted in activity's state
  private Queue<Message> mMessages;

  private static final String PREF_FILE_NAME = "hints";

  private Context mContext;
  private SharedPreferences mPrefs;
  private AlertDialog mHintDialog;

  private boolean mOneTimeHintsEnabled;

  public HintsQueue(Context context) {
    mContext = context;
    mPrefs = mContext.getSharedPreferences(PREF_FILE_NAME, Context.MODE_PRIVATE);

    SharedPreferences gameSettings = PreferenceManager.getDefaultSharedPreferences(context);
    gameSettings.registerOnSharedPreferenceChangeListener(new OnSharedPreferenceChangeListener() {

      @Override
      public void onSharedPreferenceChanged(
          SharedPreferences sharedPreferences, String key) {
        if (key.equals("show_hints")) {
          mOneTimeHintsEnabled = sharedPreferences.getBoolean("show_hints", true);
        }
      }

    });
    mOneTimeHintsEnabled = gameSettings.getBoolean("show_hints", true);

    mHintDialog = new AlertDialog.Builder(context)
        .setIcon(android.R.drawable.ic_menu_info_details)
        .setTitle(R.string.hint)
        .setMessage("")
        .setPositiveButton(R.string.close, mHintClosed).create();

    mHintDialog.setOnDismissListener(new OnDismissListener() {

      @Override
      public void onDismiss(DialogInterface dialog) {
        processQueue();
      }

    });

    mMessages = new LinkedList<Message>();
  }

  private void addHint(Message hint) {
    synchronized (mMessages) {
      mMessages.add(hint);
    }

    synchronized (mHintDialog) {
      if (!mHintDialog.isShowing()) {
        processQueue();
      }
    }
  }

  private void processQueue() {
    Message hint;

    synchronized (mMessages) {
      hint = mMessages.poll();
    }

    if (hint != null) {
      showHintDialog(hint);
    }
  }

  private void showHintDialog(Message hint) {
    synchronized (mHintDialog) {
      mHintDialog.setTitle(mContext.getString(hint.titleResID));
      mHintDialog.setMessage(mContext.getText(hint.messageResID));
      mHintDialog.show();
    }
  }

  private OnClickListener mHintClosed = new OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
      //processQueue();
    }

  };

  public void showHint(int titleResID, int messageResID, Object... args) {
    Message hint = new Message();
    hint.titleResID = titleResID;
    hint.messageResID = messageResID;
    //hint.args = args;
    addHint(hint);
  }

  public void showOneTimeHint(String key, int titleResID, int messageResID, Object... args) {
    if (mOneTimeHintsEnabled) {

      // FIXME: remove in future versions
      // Before 1.0.0, hintKey was created from messageResID. This ID has in 1.0.0 changed.
      // From 1.0.0, hintKey is based on key, to be backward compatible, check for old
      // hint keys.
      if (legacyHintsWereDisplayed()) {
        return;
      }

      String hintKey = "hint_" + key;
      if (!mPrefs.getBoolean(hintKey, false)) {
        showHint(titleResID, messageResID, args);
        Editor editor = mPrefs.edit();
        editor.putBoolean(hintKey, true);
        editor.commit();
      }
    }

  }

  public boolean legacyHintsWereDisplayed() {
    return mPrefs.getBoolean("hint_2131099727", false) &&
        mPrefs.getBoolean("hint_2131099730", false) &&
        mPrefs.getBoolean("hint_2131099726", false) &&
        mPrefs.getBoolean("hint_2131099729", false) &&
        mPrefs.getBoolean("hint_2131099728", false);
  }

  public void resetOneTimeHints() {
    Editor editor = mPrefs.edit();
    editor.clear();
    editor.commit();
  }

  /**
   * This should be called when activity is paused.
   */
  public void pause() {
    // get rid of WindowLeakedException in logcat
    if (mHintDialog != null) {
      mHintDialog.cancel();
    }
  }

  private static class Message {
    int titleResID;
    int messageResID;
    //Object[] args;
  }

}

Java Source Code List

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