Package com.substanceofcode.rssreader.presentation

Source Code of com.substanceofcode.rssreader.presentation.UiUtil

/*
*
* UiUtil.java
*
* Copyright (C) 2008 Irving Bunton, Jr
* http://www.substanceofcode.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*/

// Expand to define test define
@DTESTDEF@
// Expand to define test ui define
@DTESTUIDEF@
// Expand to define MIDP define
@DMIDPVERS@
// Expand to define logging define
@DLOGDEF@


package com.substanceofcode.rssreader.presentation;

import java.util.Vector;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.Gauge;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
// If not using the test UI define the J2ME UI's
//#ifndef DTESTUI
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import javax.microedition.lcdui.StringItem;
//#else
// If using the test UI define the Test UI's
import com.substanceofcode.testlcdui.ChoiceGroup;
import com.substanceofcode.testlcdui.Form;
import com.substanceofcode.testlcdui.List;
import com.substanceofcode.testlcdui.TextBox;
import com.substanceofcode.testlcdui.TextField;
import com.substanceofcode.testlcdui.StringItem;
//#endif

import cz.cacek.ebook.util.ResourceProviderME;

//#ifdef DLOGGING
import net.sf.jlogmicro.util.logging.Logger;
import net.sf.jlogmicro.util.logging.Level;
//#endif

/**
* RSS feed reader MIDlet
*
* RssReaderMIDlet is an application that can read RSS feeds. User can store
* multiple RSS feeds as bookmarks into application's record store.
*
* @author  Irving Bunton
* @version 1.0
*/
final public class UiUtil implements CommandListener {
    private RssReaderMIDlet   m_midlet;  // The RssReaderMIDlet midlet
    private Form        m_urlRrnForm;    // The form to return to for URL box
    private TextField   m_urlRrnItem;    // The item to return to for URL box

  public UiUtil() { }

  /**
   * Create a new command using the resource key and standard parms
   *
   * @param key - Key for resource command label
   * @param commandType - Command type
   * @param priority - Command priority
   * @return    Command
   * @author Irv Bunton
   */
    final public static Command getCmdRsc(String key, int commandType,
      int priority) {
    //#ifdef DLOGGING
    Logger logger = Logger.getLogger("UiUtil");
    logger.finest("key,commandType,priority=" + key + "," + commandType + "," + priority);
    //#endif
    return new Command(ResourceProviderME.get(key), commandType, priority);
  }

  /**
   * Create a new command using the resource key and standard parms
   *
   * @param key - Key for resource command label
   * @param lngkey - Key for resource command long label
   * @param commandType - Command type
   * @param priority - Command priority
   * @return    Command
   * @author Irv Bunton
   */
    final public static Command getCmdRsc(String key, String lngkey,
      int commandType, int priority) {
    //#ifdef DLOGGING
    Logger logger = Logger.getLogger("UiUtil");
    logger.finest("key,lngkey,commandType,priority=" + key + "," + lngkey + "," + commandType + "," + priority);
    //#endif
    //#ifdef DMIDP20
    if (lngkey != null) {
      return new Command(ResourceProviderME.get(key),
          ResourceProviderME.get(lngkey), commandType, priority);
    } else {
      return new Command(ResourceProviderME.get(key), commandType,
          priority);
    }
    //#else
    return new Command(ResourceProviderME.get(key), commandType, priority);
    //#endif
  }

  /**
   * Remove all commands from the displayable
   *
   * @param cmds
   * @author Irv Bunton
   */
  final public static void delCmds(Displayable disp, Command[] cmds) {
    for (int ic = 0; ic < cmds.length; ic++) {
      disp.removeCommand( cmds[ic] );
    }
  }

  /**
   * Delete items from the form.
   *
   * @param aForm
   * @author Irv Bunton
   */
  //#ifdef DTESTUI
  final public static void delItems(javax.microedition.lcdui.Form aForm)
  //#else
  final public static void delItems(Form aForm)
  //#endif
  {
    //#ifdef DMIDP20
    if(aForm.size()>0) {
      aForm.deleteAll();
    }
    //#else
    int fsize = aForm.size();
    while(fsize-- > 0) {
      aForm.delete(0);
    }
    //#endif
  }

  /**
   * Delete items from the list.
   *
   * @param aList
   * @author Irv Bunton
   */
  final public static void delItems(List aList) {
    //#ifdef DMIDP20
    if(aList.size()>0) {
      aList.deleteAll();
    }
    //#else
    int lsize = aList.size();
    while(lsize-- > 0) {
      aList.delete(0);
    }
    //#endif
  }

  /**
   * Get the place (index) in a list to insert/append an element if using
   * an inert, add, or append command.
   *
   * @param c - command selected by user
   * @param cplace - current place selected in list (-1 if no selection)
   * @param insCmd
   * @param addCmd
   * @param appndCmd
   * @param plist
   * @return    final
   * @author Irv Bunton
   */
  final static int getPlaceIndex(Command c, int cplace, Command insCmd,
              Command addCmd,
              Command appndCmd,
              javax.microedition.lcdui.List plist) {
    if( (c == insCmd ) || (c == addCmd ) || (c == appndCmd )) {
      final int blen = plist.size();
      int addElem = (cplace == -1) ? blen : cplace;
      if( c == addCmd ){
        if (addElem < blen) {
          addElem++;
        }
      }
      if (c == appndCmd ) {
        addElem = blen;
      }
      if ((addElem < 0) || (addElem > blen)) {
        addElem = blen;
      }
      return addElem;
    } else {
      return -1;
    }
  }

  /* Restore previous values. */
  final static public void restorePrevValues(Item[] items, byte[] bdata) {
    //#ifdef DLOGGING
    Logger logger = Logger.getLogger("UiUtil");
    boolean finestLoggable = logger.isLoggable(Level.FINEST);
    //#endif
    DataInputStream dis = new DataInputStream(
        new ByteArrayInputStream(bdata));
    for (int ic = 0; ic < items.length; ic++) {
      try {
        final Item item = items[ic];
        if (item instanceof ChoiceGroup) {
          ((ChoiceGroup)item).setSelectedIndex(dis.readInt(),
            true);
          //#ifdef DLOGGING
          if (finestLoggable) {logger.finest("set selected " + ((ChoiceGroup)item).getSelectedIndex());}
          //#endif
        } else if (item instanceof TextField) {
          final int len = dis.readInt();
          byte [] bvalue = new byte[len];
          dis.read(bvalue);
          String value;
          try {
            value = new String(bvalue, "UTF-8");
          } catch (UnsupportedEncodingException e) {
            value = new String(bvalue);
            //#ifdef DLOGGING
            logger.severe("cannot convert value=" + value, e);
            //#endif
          }
          ((TextField)item).setString(value);
          //#ifdef DLOGGING
          if (finestLoggable) {logger.finest("set string " + ((TextField)item).getString());}
          //#endif
        }
      } catch (IOException e) {
        //#ifdef DLOGGING
        logger.severe("IOException reading selected.", e);
        //#endif
      }
    }
    if (dis != null) {
      try { dis.close(); } catch (IOException e) {}
    }
  }

  /* Store current values. */
  final public static byte[] storeValues(Item[] items) {
    //#ifdef DLOGGING
    Logger logger = Logger.getLogger("UiUtil");
    boolean finestLoggable = logger.isLoggable(Level.FINEST);
    //#endif
    ByteArrayOutputStream bout = new
        ByteArrayOutputStream();
    DataOutputStream dout = new
        DataOutputStream( bout );
    for (int ic = 0; ic < items.length; ic++) {
      try {
        final Item item = items[ic];
        if (item instanceof ChoiceGroup) {
          dout.writeInt(((ChoiceGroup)item).getSelectedIndex());
          //#ifdef DLOGGING
          if (finestLoggable) {logger.finest("stored selected " + item.getLabel() + "," + ((ChoiceGroup)item).getSelectedIndex());}
          //#endif
        } else if (item instanceof TextField) {
          final String value = ((TextField)item).getString();
          dout.writeInt(value.length());
          byte [] bvalue;
          try {
            bvalue = value.getBytes("UTF-8");
          } catch (UnsupportedEncodingException e) {
            bvalue = value.getBytes();
            //#ifdef DLOGGING
            logger.severe("cannot store value=" + value, e);
            //#endif
          }
          dout.write( bvalue, 0, bvalue.length );
          //#ifdef DLOGGING
          if (finestLoggable) {logger.finest("set string " + item.getLabel() + "," + ((TextField)item).getString());}
          //#endif
        }
      } catch (IOException e) {
        //#ifdef DLOGGING
        logger.severe("IOException storing selected.", e);
        //#endif
      }
    }
    //#ifdef DLOGGING
    if (finestLoggable) {logger.finest("bout.toByteArray().length=" + bout.toByteArray().length);}
    //#endif
    if (dout != null) {
      try { dout.close(); } catch (IOException e) {}
    }
    return bout.toByteArray();
  }

  /**
   * Return the selected index of the choice.  If nothing selected (-1),
   * return 0 if size &gt; 0, or -1 if 0 size.
   *
   * Constructor
   * @param choice - Choice interface
   *
   * @author Irv Bunton
   */
  final static public int getSelectedIndex(Choice choice) {
    final int selIdx = choice.getSelectedIndex();
    if (selIdx != -1) {
      return selIdx;
    } else {
      if (choice.size() > 0) {
        choice.setSelectedIndex(0, true);
        return 0;
      } else {
        return -1;
      }
    }
  }

  /**
   * Get the image for the image path.
   *
   * @param imagePath - Path for image
   * @return    Image - image for path
   *
   * @author Irv Bunton
   */
  final public static Image getImage(final String imagePath) {
    Image image = null;
    try {
      try {
        // createImage("/icons/unread.png") does not always work
        // with the emulator.  so, I do an alternate which is
        // effectively the same thing.
        image = Image.createImage(imagePath);
      } catch(IOException e) {
        //#ifdef DMIDP20
        InputStream is =
            imagePath.getClass().getResourceAsStream(imagePath);
        if (is == null) {
          throw new IOException("Cannot open resource " + imagePath);
        }
        image = Image.createImage(is);
        is.close();
        //#endif
        //#ifdef DLOGGING
        Logger logger = Logger.getLogger("UiUtil");
        logger.warning(
            "Could not get icon, alternate worked icons ex: ", e);
        //#endif
      }
    } catch(Exception e) {
      //#ifdef DLOGGING
      Logger logger = Logger.getLogger("UiUtil");
      logger.severe("Could not get image " + imagePath, e);
      //#endif
      System.err.println("Error while getting mark image: " + e.toString());
    } finally {
      return image;
    }
   
  }

  public static void showAlert(MIDlet midlet, Alert alert,
      Displayable disp) {
    //#ifdef DLOGGING
    Logger logger = Logger.getLogger("UiUtil");
    logger.finest("alert,disp=" + alert.getString() + "," + alert.getType());
    //#endif
    if (alert.getType() == AlertType.CONFIRMATION) {
      //#ifdef DLOGGING
      logger.finest("Alert not displayed when type is CONFIRMATION, changing to INFO");
      //#endif
      alert.setType(AlertType.INFO);
    }
    Display.getDisplay(midlet).setCurrent(alert, disp);
  }

  /**
   * Create a ChoiceGroup, set the layout and add it to the form.
   *
   * @param label
   * @param choices
   * @return    ChoiceGroup
   * @author Irv Bunton
   */
  static public ChoiceGroup getAddChoiceGroup(Form form, String label,
                        String[] choices) {
        ChoiceGroup choiceGroup = new ChoiceGroup(label,
                                    Choice.EXCLUSIVE, choices, null);
    //#ifdef DMIDP20
    choiceGroup.setLayout(Item.LAYOUT_BOTTOM);
    //#endif
        form.append( choiceGroup );
    return choiceGroup;
  }

  //#ifndef DSMALLMEM
    /** Initialize URL text Box */
    final public void initializeURLBox(RssReaderMIDlet midlet, final String url,
      Form prevForm, TextField prevItem) {
    m_midlet = midlet;
    TextBox boxURL = new TextBox("URL", url, 256, TextField.URL);
    m_urlRrnForm = prevForm;
    m_urlRrnItem = prevItem;
    boxURL.addCommand(UiUtil.getCmdRsc("cmd.ok", Command.OK, 2));
    boxURL.addCommand(UiUtil.getCmdRsc("cmd.cancel", Command.CANCEL, 1));
        boxURL.setCommandListener(this);
    midlet.setCurrent( boxURL );
    }
  //#endif
   
    /** Respond to commands */
    public void commandAction(final Command c, final Displayable s) {
    //#ifndef DSMALLMEM

    /** Paste into URL field from previous form.  */
    if( (m_urlRrnForm != null) &&
      (s instanceof TextBox) && (c.getCommandType() == Command.OK) ){
      m_urlRrnItem.setString( ((TextBox)s).getString() );
      //#ifdef DMIDP20
      m_midlet.setCurrentItem( m_urlRrnItem );
      //#else
      m_midlet.setCurrent( m_urlRrnForm );
      //#endif
      m_urlRrnForm = null;
      m_urlRrnItem = null;
    }
   
    /** Cancel the box go back to the return form.  */
    if( (m_urlRrnForm != null) &&
      (s instanceof TextBox) &&
      (c.getCommandType() == Command.CANCEL) ){
      //#ifdef DMIDP20
      m_midlet.setCurrentItem( m_urlRrnItem );
      //#else
      setCurrent( m_urlRrnForm );
      //#endif
      m_urlRrnForm = null;
      m_urlRrnItem = null;
    }
    //#endif
  }
 
}
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