BackgroundDesktopPane.java

package com.dreikraft.swing;

import java.awt.Graphics;
import java.awt.Image;

/**
 * BackgroundDesktopPane
 * @author jan.illetschko@3kraft.com
 */
public class BackgroundDesktopPane extends javax.swing.JDesktopPane {

  private boolean scale;
  private Image backgroundImage = null;

  /**
   * Creates new form BeanForm
   */
  public BackgroundDesktopPane() {
    initComponents();
  }

  @Override
  public void paint(Graphics g) {
    super.paint(g);
    if (getBackgroundImage() != null) {
      if (isScale()) {
        g.drawImage(getBackgroundImage(), 0, 0, getWidth(), getHeight(), this);
      } else {
        int width = getBackgroundImage().getWidth(this);
        int height = getBackgroundImage().getHeight(this);
        int xStart = (int) (((double) (getWidth() - width)) / 2.0);
        int yStart = (int) (((double) (getHeight() - height)) / 2.0);

        g.drawImage(getBackgroundImage(), xStart, yStart, width, height, this);
      }
      paintChildren(g);
    }
  }

  public boolean isScale() {
    return scale;
  }

  public void setScale(boolean scale) {
    this.scale = scale;
  }

  public Image getBackgroundImage() {
    return backgroundImage;
  }

  public void setBackgroundImage(Image backgroundImage) {
    this.backgroundImage = backgroundImage;
    this.repaint();
  }

  /**
   * This method is called from within the constructor to initialize the form.
   * WARNING: Do NOT modify this code. The content of this method is always
   * regenerated by the Form Editor.
   */
  // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
  private void initComponents()
  {

    setBackground(new java.awt.Color(255, 255, 255));
  }// </editor-fold>//GEN-END:initComponents
  // Variables declaration - do not modify//GEN-BEGIN:variables
  // End of variables declaration//GEN-END:variables
}