Application: gvSIG desktop

/*

 *  $Id: IzPanel.java 5819 2006-06-14 07:29:09Z cesar $

 *  IzPack

 *  Copyright (C) 2001-2004 Julien Ponge

 *

 *  File :               IzPanel.java

 *  Description :        The class for the panels.

 *  Author's email :     julien@izforge.com

 *  Author's Website :   http://www.izforge.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 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.

 */

package com.izforge.izpack.installer;

import java.awt.Component;

import java.awt.Font;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.Insets;

import javax.swing.ImageIcon;

import javax.swing.JComponent;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.LookAndFeel;

import javax.swing.UIManager;

import javax.swing.plaf.metal.MetalLookAndFeel;

import net.n3.nanoxml.XMLElement;

import com.izforge.izpack.gui.LabelFactory;

import com.izforge.izpack.util.AbstractUIHandler;

import com.izforge.izpack.util.MultiLineLabel;

/**

 *  Defines the base class for the IzPack panels. Any panel should be a subclass

 *  of it and should belong to the <code>com.izforge.izpack.panels</code>

 *  package.

 *

 * @author     Julien Ponge

 */

public class IzPanel extends JPanel implements AbstractUIHandler

{

  /** Indicates whether grid bag layout was started or not */

  protected boolean gridBagLayoutStarted = false;

  /** The component which should get the focus at activation */

  protected Component initialFocus = null;

  /**

   *  The installer internal data (actually a melting-pot class with all-public

   *  fields.

   */

  protected InstallData idata;

  /**  The parent IzPack installer frame. */

  protected InstallerFrame parent;

  /** The default grid bag constraint. */

  protected GridBagConstraints defaultGridBagConstraints = new GridBagConstraints ();

  /** Current x position of grid. */

  protected int gridxCounter = -1;

  /** Current y position of grid. */

  protected int gridyCounter = -1;

  /**

   *  The constructor.

   *

   * @param  parent  The parent IzPack installer frame.

   * @param  idata   The installer internal data.

   */

  public IzPanel(InstallerFrame parent, InstallData idata)

  {

    super();

    this.idata = idata;

    this.parent = parent;

  }

  /**

   *  Indicates wether the panel has been validated or not. The installer won't

   *  let the user go further through the installation process until the panel

   *  is validated. Default behaviour is to return <code>true</code>.

   *

   * @return    A boolean stating wether the panel has been validated or not.

   */

  public boolean isValidated()

  {

    return true;

  }

  /**

   *  This method is called when the panel becomes active. Default is to do

   *  nothing : feel free to implement what you need in your subclasses. A panel

   *  becomes active when the user reaches it during the installation process.

   */

  public void panelActivate()

  {

  }

  /**

   *  This method is called when the panel gets desactivated, when the user

   *  switches to the next panel. By default it doesn't do anything.

   */

  public void panelDeactivate()

  {

  }

  /**

   *  Asks the panel to set its own XML data that can be brought back for an

   *  automated installation process. Use it as a blackbox if your panel needs

   *  to do something even in automated mode.

   *

   * @param  panelRoot  The XML root element of the panels blackbox tree.

   */

  public void makeXMLData(XMLElement panelRoot)

  {

  }

  /**

   * Ask the user a question.

   * 

   * @param title Message title.

   * @param question The question.

   * @param choices The set of choices to present.

   * 

   * @return The user's choice.

   * 

   * @see AbstractUIHandler#askQuestion(String, String, int)

   */

  public int askQuestion(String title, String question, int choices)

  {

    return askQuestion(title, question, choices, -1);

  }

  /**

   * Ask the user a question.

   * 

   * @param title Message title.

   * @param question The question.

   * @param choices The set of choices to present.

   * @param default_choice The default choice. (-1 = no default choice)

   * 

   * @return The user's choice.

   * @see AbstractUIHandler#askQuestion(String, String, int, int)

   */

  public int askQuestion(

    String title,

    String question,

    int choices,

    int default_choice)

  {

    int jo_choices = 0;

    if (choices == AbstractUIHandler.CHOICES_YES_NO)

      jo_choices = JOptionPane.YES_NO_OPTION;

    else if (choices == AbstractUIHandler.CHOICES_YES_NO_CANCEL)

      jo_choices = JOptionPane.YES_NO_CANCEL_OPTION;

    int user_choice =

      JOptionPane.showConfirmDialog(

        this,

        (Object) question,

        title,

        jo_choices,

        JOptionPane.QUESTION_MESSAGE);

    if (user_choice == JOptionPane.CANCEL_OPTION)

      return AbstractUIHandler.ANSWER_CANCEL;

    if (user_choice == JOptionPane.YES_OPTION)

      return AbstractUIHandler.ANSWER_YES;

    if (user_choice == JOptionPane.NO_OPTION)

      return AbstractUIHandler.ANSWER_NO;

    return default_choice;

  }

  /**

   * Notify the user about something.

   * 

   * @param message The notification.

   */

  public void emitNotification(String message)

  {

     JOptionPane.showMessageDialog(

      this,message);

  }

  /**

   * Warn the user about something.

   * 

   * @param message The warning message.

   */

  public boolean emitWarning(String title, String message)

  {

    return (

      JOptionPane.showConfirmDialog(

        this,

        message,

        title,

        JOptionPane.WARNING_MESSAGE,

        JOptionPane.OK_CANCEL_OPTION)

        == JOptionPane.OK_OPTION);

  }

  /**

   * Notify the user of some error.

   * 

   * @param message The error message.

   */

  public void emitError(String title, String message)

  {

    JOptionPane.showMessageDialog(

      this,

      message,

      title,

      JOptionPane.ERROR_MESSAGE);

  }

  /**

   * Returns the component which should be get the

   * focus at activation of this panel.

   * @return the component which should be get the

   * focus at activation of this panel

   */

  public Component getInitialFocus()

  {

    return initialFocus;

  }

  /**

   * Sets the component which should be get the

   * focus at activation of this panel.

   * @param component which should be get the

   * focus at activation of this panel

   */

  public void setInitialFocus(Component component)

  {

    initialFocus = component;

  }

  /**

   * Calls the langpack of parent InstallerFrame for the String 

   * <tt>RuntimeClassName.subkey</tt>. Do not add a point infront

   * of subkey, it is always added in this method.

   * @param subkey the subkey for the string which should be returned

   * @param alternateClass the short name of the class which should be used 

   * if no string is present with the runtime class name 

   * @return the founded string

   */

  public String getI18nStringForClass(String subkey, String alternateClass )

  {

    String curClassName = this.getClass().getName();

    int     nameStart     = curClassName.lastIndexOf ('.') + 1;

    curClassName          = curClassName.substring (nameStart, curClassName.length ());

    StringBuffer buf = new StringBuffer();

    buf.append(curClassName).append(".").append(subkey);

    String fullkey = buf.toString();

    String retval = parent.langpack.getString( fullkey);

    if( retval == null || retval.equals(fullkey) )

    {

      buf.delete(0, buf.length());

      buf.append(alternateClass).append(".").append(subkey);

      retval = parent.langpack.getString( buf.toString());

    }

    return( retval);

  }

  /**

   * Returns the parent of this IzPanel (which is a InstallerFrame).

   * @return the parent of this IzPanel

   */

  public InstallerFrame getInstallerFrame()

  {

    return(parent);

  }

  //------------- Helper for common used components ----- START ---

  /**

   * Creates  a label via LabelFactory with the given ids and

   * the given horizontal alignment. If the icon id is null, the

   * label will be created also. The strings are the ids for the text

   * in langpack and the icon in icons of the installer frame.

   * @param textId id string for the text

   * @param iconId id string for the icon

   * @param pos horizontal alignment

   * @return the newly created label

   */

  public JLabel createLabel(String textId, String iconId, int pos)

  {

    ImageIcon ii = ( iconId != null ) ? parent.icons.getImageIcon(iconId) : null;

    JLabel label = LabelFactory.create(

      parent.langpack.getString(textId),

      ii, 

      pos);

    if(label != null)

      label.setFont(getControlTextFont() );

    return(label);

  }

  /**

   * Creates a multi line label with the language dependent text

   * given by the text id. The strings is the id for the text

   * in langpack of the installer frame. The horizontal alignment

   * will be LEFT.

   * @param textId id string for the text

   * @return the newly created multi line label

   */

  public MultiLineLabel createMultiLineLabelLang(String textId)

  {

    return( createMultiLineLabel(

      parent.langpack.getString( textId)  ));

  }

  /**

   * Creates a multi line label with the given text. 

   * The horizontal alignment will be LEFT.

   * @param text text to be used in the label

   * @return the newly created multi line label

   */

  public MultiLineLabel createMultiLineLabel(String text)

  {

    return( createMultiLineLabel(

      text, null , JLabel.LEFT ));

  }

  /**

   * Creates  a label via LabelFactory with the given text, the

   * given icon id  and the given horizontal alignment. 

   * If the icon id is null, the

   * label will be created also. The strings are the ids for the text

   * in langpack and the icon in icons of the installer frame.

   * @param text text to be used in the label

   * @param iconId id string for the icon

   * @param pos horizontal alignment

   * @return

   */

  public MultiLineLabel createMultiLineLabel(String text, 

    String iconId, int pos)

  {

    MultiLineLabel mll = null;

    mll = new MultiLineLabel( text, 0, 0);

    if( mll != null)

      mll.setFont(getControlTextFont() );

    return( mll );

  }

  /**

   * The Font of Labels in many cases

   */

  public Font getControlTextFont()

  {

    return( getLAF() != null ? MetalLookAndFeel.getControlTextFont() : getFont() );

  }

  protected static MetalLookAndFeel getLAF()

  {

    LookAndFeel laf = UIManager.getLookAndFeel();

    if( laf instanceof MetalLookAndFeel)

      return( (MetalLookAndFeel) laf);

    return( null );

  }

  //------------- Helper for common used components ----- END ---

  //------------------- Layout stuff -------------------- START ---

  /**

   * Returns the default GridBagConstraints of this panel.

   * @return the default GridBagConstraints of this panel

   */

  public GridBagConstraints getDefaultGridBagConstraints()

  {

    startGridBagLayout();

    return defaultGridBagConstraints;

  }

  /**

   * Sets the default GridBagConstraints of this panel to the given object.

   * @param constraints which should be set as default for this object

   */

  public void setDefaultGridBagConstraints(GridBagConstraints constraints)

  {

    startGridBagLayout();

    defaultGridBagConstraints = constraints;

  }

  /**

   * Resets the grid counters which are used at getNextXGridBagConstraints

   * and getNextYGridBagConstraints.

   */

  public void resetGridCounter()

  {

    gridxCounter = -1;

    gridyCounter = -1;

  }

  /**

   * Returns a newly created GridBagConstraints with the given values

   * and the values from the defaultGridBagConstraints for the other parameters.

   * @param gridx  value to be used for the new constraint

   * @param gridy  value to be used for the new constraint

   * @return newly created GridBagConstraints with the given values

   * and the values from the defaultGridBagConstraints for the other parameters

   */

  public GridBagConstraints getNewGridBagConstraints(int gridx, int gridy)

  {

    GridBagConstraints retval = (GridBagConstraints) getDefaultGridBagConstraints().clone();

    retval.gridx = gridx;

    retval.gridy = gridy;

    return(retval);

  }

  /**

   * Returns a newly created GridBagConstraints with the given values

   * and the values from the defaultGridBagConstraints for the other parameters.

   * @param gridx  value to be used for the new constraint

   * @param gridy  value to be used for the new constraint

   * @param gridwidth value to be used for the new constraint

   * @param gridheight value to be used for the new constraint

   * @return newly created GridBagConstraints with the given values

   * and the values from the defaultGridBagConstraints for the other parameters

   */

  public GridBagConstraints getNewGridBagConstraints(int gridx, int gridy,

    int gridwidth, int gridheight)

  {

    GridBagConstraints retval = getNewGridBagConstraints( gridx, gridy );

    retval.gridwidth = gridwidth;

    retval.gridheight = gridheight;

    return(retval);

  }

  /**

   * Returns a newly created GridBagConstraints for the next column 

   * of the current layout row.

   * @return a newly created GridBagConstraints for the next column 

   * of the current layout row

   * 

   */

  public GridBagConstraints getNextXGridBagConstraints()

  {

    gridxCounter++;

    GridBagConstraints retval = getNewGridBagConstraints(gridxCounter,gridyCounter);

    return(retval);

  }

  /**

   * Returns a newly created GridBagConstraints for the next column 

   * of the current layout row using the given parameters.

   * @param gridwidth width for this constraint

   * @param gridheight height for this constraint

   * @return a newly created GridBagConstraints for the next column 

   * of the current layout row using the given parameters

   */

  private GridBagConstraints getNextXGridBagConstraints( int gridwidth, int gridheight)

  {

    GridBagConstraints retval = getNextXGridBagConstraints();

    retval.gridwidth = gridwidth;

    retval.gridheight = gridheight;

    return( retval );

  }

  /**

   * Returns a newly created GridBagConstraints with column 0 

   * for the next row.

   * @return a newly created GridBagConstraints with column 0 

   * for the next row

   * 

   */

  public GridBagConstraints getNextYGridBagConstraints()

  {

    gridyCounter++;

    gridxCounter = 0;

    GridBagConstraints retval = getNewGridBagConstraints(0,gridyCounter);

    return(retval);

  }

  /**

   * Returns a newly created GridBagConstraints with column 0 

   * for the next row using the given parameters.

   * @param gridwidth width for this constraint

   * @param gridheight height for this constraint

   * @return a newly created GridBagConstraints with column 0 

   * for the next row using the given parameters

   */

  public GridBagConstraints getNextYGridBagConstraints( int gridwidth, int gridheight)

  {

    startGridBagLayout();

    GridBagConstraints retval = getNextYGridBagConstraints();

    retval.gridwidth = gridwidth;

    retval.gridheight = gridheight;

    return( retval );

  }

  /**

   * Start layout determining. If it is needed, a dummy component 

   * will be created as first row. This will be done,

   * if the IzPack variable <code>IzPanel.LayoutType</code> has

   * the value "BOTTOM".

   */

  public void startGridBagLayout()

  {

    if( gridBagLayoutStarted  )

      return;

    gridBagLayoutStarted = true;

    GridBagLayout layout = new GridBagLayout();

    defaultGridBagConstraints.insets = new Insets( 0, 0, 20, 0);

    defaultGridBagConstraints.anchor = GridBagConstraints.WEST;   

    setLayout(layout);

    String todo = idata.getVariable("IzPanel.LayoutType");

    if( todo == null )  // No command, no work.

      return;

    if( todo.equals("BOTTOM"))

    { // Make a header to push the rest to the bottom.

      Filler dummy = new Filler();

      GridBagConstraints gbConstraint = getNextYGridBagConstraints();

      gbConstraint.weighty = 1.0;

      gbConstraint.fill = GridBagConstraints.BOTH;

      gbConstraint.anchor = GridBagConstraints.WEST;        

      this.add(dummy, gbConstraint );

    }

    // TODO: impl for layout type CENTER,  ...

  }

  /**

   * Complete layout determining. If it is needed, a dummy component 

   * will be created as last row. This will be done,

   * if the IzPack variable <code>IzPanel.LayoutType</code> has

   * the value "TOP".

   */

  public void completeGridBagLayout()

  {

    String todo = idata.getVariable("IzPanel.LayoutType");

    if( todo == null )  // No command, no work.

      return;

    if( todo.equals("TOP"))

    { // Make a footer to push the rest to the top.

       Filler dummy = new Filler();

      GridBagConstraints gbConstraint = getNextYGridBagConstraints();

      gbConstraint.weighty = 1.0;

      gbConstraint.fill = GridBagConstraints.BOTH;

      gbConstraint.anchor = GridBagConstraints.WEST;        

      this.add(dummy, gbConstraint );

    }

  }

  //------------------- Layout stuff -------------------- END ---

  //------------------- Inner classes ------------------- START ---

  public static class Filler extends JComponent 

  {

  }

  //------------------- Inner classes ------------------- END ---

}