ShadowRectangle.java

package org.framed.orm.ui.figure.shapes;

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.RectangleFigure;
import org.eclipse.draw2d.geometry.Insets;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.graphics.Color;

/**
 * {@link RectangleFigure} with a border shadow.
 * 
 * @author Kay Bierzynski
 * */
public class ShadowRectangle extends RectangleFigure {

  /** Variable, which containts the value for the shadow inset. */
  public static final int SHADOW_INSET = 4;

  /**
   * 
   * @see Shape#fillShape(Graphics)
   */
  protected void fillShape(final Graphics graphics) {
    final Rectangle f = Rectangle.SINGLETON.setBounds(getBounds());
    Insets shadowInset = new Insets(0, 0, SHADOW_INSET, SHADOW_INSET);
    f.crop(shadowInset);
    this.drawShadow(f, graphics);
    graphics.fillRectangle(f);
  }

  /**
   * A getter for the inset of this {@link RectangleFigure}.
   * 
   * @return {@link Insets}
   * */
  public Insets getInsets() {
    return new Insets(1, 1, SHADOW_INSET + 1, SHADOW_INSET + 1);
  }

  /**
   * @see Shape#outlineShape(Graphics)
   */
  protected void outlineShape(final Graphics graphics) {
    final Rectangle f = Rectangle.SINGLETON.setBounds(getBounds());
    final Insets shadowInset =
        new Insets(lineWidth / 2, lineWidth / 2, lineWidth + SHADOW_INSET, lineWidth + SHADOW_INSET);

    f.crop(shadowInset);
    graphics.drawRectangle(f);
  }



  /**
   * This method draws the border shadow.
   * */
  private void drawShadow(final Rectangle rectangle, final Graphics graphics) {
    this.drawShadowLayer(rectangle, graphics, 3, ColorConstants.lightGray);
    this.drawShadowLayer(rectangle, graphics, 2, ColorConstants.gray);
    this.drawShadowLayer(rectangle, graphics, 1, ColorConstants.darkGray);
  }


  /**
   * This method draws the border shadow layers.
   * */
  private void drawShadowLayer(final Rectangle rectangle, final Graphics graphics,
      final int offset, final Color color) {
    // Save the state of the graphics object
    graphics.pushState();
    graphics.setLineWidth(0);
    graphics.setBackgroundColor(color);
    Rectangle shadowLayer = new Rectangle(rectangle);
    shadowLayer.x += offset;
    shadowLayer.y += offset;
    graphics.fillRectangle(shadowLayer);
    // Restore the start of the graphics object
    graphics.popState();
  }


}