lwcomprender.java

Zaval Light-Weight Visual Components Library (LwVCL) is a pure Java alternative to humble AWT-based

/**
 *     Caption: Zaval Light-Weight Visual Components Library
 *     $Revision: 2.79 $
 *     $Date: 2003/08/22 11:24:16 $
 *
 *     @author:     Andrei Vishnevsky
 *     @version:    3.50
 *
 * Zaval Light-Weight Visual Components Library (LwVCL) is a pure Java
 * alternative to humble AWT-based and SWING-based GUI interfaces for
 * wide ranges of platforms, including J2SE, PersonalJava and J2ME.
 *
 * Designed as light-weight but, alternatively to Swing, built separately
 * from AWT (not on top of the java.awt library like Swing), the LwVCL is
 * the good alternative to highly performant, memory-efficient, flexible
 * GUI solution for embedded, stand-alone and applet applications.
 *
 * For more info on this product read Zaval Light-Weight Visual Components Library Tutorial
 * (It comes within this package).
 * The latest product version is always available from the product's homepage:
 * http://www.zaval.org/products/lwvcl/
 * and from the SourceForge:
 * http://sourceforge.net/projects/zaval0003/
 *
 * Contacts:
 *   Support : [e-mail]
 *   Change Requests : [e-mail]
 *   Feedback : [e-mail]
 *   Other : [e-mail]
 *
 * Copyright (C) 2001-2003  Zaval Creative Engineering Group (http://www.zaval.org)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * (version 2) as published by the Free Software Foundation.
 *
 * 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 org.zaval.lw;

import java.awt.*;

/**
 * The class implements lightweigt component render interface that provides ability to render
 * a light weight component (the light weight component should be used as a target for the render).
 */
public class LwCompRender
extends LwRender
{
 /**
  * Constructs the render with the specified target light weight component.
  * @param <code>c</code> the target light weight component to be rendered.
  */
  public LwCompRender(LwComponent c) {
    super(c);
  }

 /**
  * Calculates and returns the view preferred size. The method has not to use
  * the view insets to compute the preferred size (this is named "pure" preferred size).
  * The method returns the target light weight component prefered size if it is defined.
  * @return a "pure" preferred size of the view.
  */
  protected /*C#override*/ Dimension calcPreferredSize() {
    LwComponent target = (LwComponent)getTarget();
    return target == null? super.calcPreferredSize():target.getPreferredSize();
  }

 /**
  * Invoked with <code>validate</code> method if the view is invalid. The method
  * is used to calculate metrical characteristics of the view and the method
  * is called only if it is realy necessary, so there is not necessaty to care about
  * superfluous calling and computing.
  */
  protected /*C#override*/ void recalc (){
    LwComponent target = (LwComponent)getTarget();
    if (target != null) target.validate();
  }

 /**
  * Paints the view using the given width and height. The location where the
  * view has to be painted is determined with <code>x</code> and <code>y</code>
  * coordinates.
  * @param <code>g</code> the specified context to be used for painting.
  * @param <code>x</code> the x coordinate.
  * @param <code>y</code> the y coordinate.
  * @param <code>w</code> the width of the view.
  * @param <code>h</code> the height of the view.
  * @param <code>d</code> the owner component.
  */
  public /*C#override*/ void paint(Graphics g, int x, int y, int w, int h, Drawable d)
  {
    LwComponent c = (LwComponent)getTarget();
    if (c != null)
    {
      if (LwToolkit.getDesktop(c) == null) c.setSize(w, h);
      Rectangle prevClip = g.getClipBounds();
      g.translate(x, y);
      LwPaintManager.manager.paint (g, c);
      g.translate(-x, -y);
      if (prevClip != null) g.setClip(prevClip);
    }
  }
}