import java.awt.*;

/** Note from Francis : This class was one of the simple Vertical FlowLayout
 * managers I found on the Web, so I shamelessly copied its source code
 * into my own. It is obviously lacking the proper comments, but this
 * layout's name is pretty self-explanatory...!
 *
 * Creation date: (3/30/2000 4:10:35 PM)
 * @author: David Risner
 */
public class VerticalFlowLayout implements LayoutManager {
  private int vgap = 0;

  /**
   * This default constructor creates a Vertical FLowLayout using 0 for the vertical gap between the layed-out components.
   */
  public VerticalFlowLayout() {
    this(0);
  }

  /** This constructor creates a Vertical FLowLayout using the specified vgap value for the vertical 
   * gap between the layed-out components.
   * @param vgap Vertical gap to be used
   */
  public VerticalFlowLayout(int vgap) {
    if (vgap < 0) {
      this.vgap = 0;
    } else {
      this.vgap = vgap;
    } 
  }

  /** Unimplemented method of the interface
   * @param name Name
   * @param comp The component
   */
  public void addLayoutComponent(String name, Component comp) {
  } 

  /** layoutContainer method comment.
   * @param parent The parent component
   */
  public void layoutContainer(Container parent) {
    Insets insets = parent.getInsets();
    int w = parent.getSize().width - insets.left - insets.right;

    // int h = parent.size().height - insets.top - insets.bottom;
    int numComponents = parent.getComponentCount();

    if (numComponents == 0) {
      return;
    } 
    int y = insets.top;
    int x = insets.left;

    for (int i = 0; i < numComponents; ++i) {
      Component c = parent.getComponent(i);

      if (c.isVisible()) {
        Dimension d = c.getPreferredSize();

        c.setBounds(x, y, w, d.height);
        y += d.height + vgap;
      } 
    } 
  } 

  /** minimumLayoutSize method comment.
   * @param parent The parent component
   * @return The minimum dimension
   */
  public Dimension minimumLayoutSize(Container parent) {
    Insets insets = parent.getInsets();
    int maxWidth = 0;
    int totalHeight = 0;
    int numComponents = parent.getComponentCount();

    for (int i = 0; i < numComponents; ++i) {
      Component c = parent.getComponent(i);

      if (c.isVisible()) {
        Dimension cd = c.getMinimumSize();

        maxWidth = Math.max(maxWidth, cd.width);
        totalHeight += cd.height;
      } 
    } 
    Dimension td = new Dimension(maxWidth + insets.left + insets.right, 
                                 totalHeight + insets.top + insets.bottom 
                                 + vgap * numComponents);

    return td;
  } 

  /** preferredLayoutSize method comment.
   * @param parent The parent component
   * @return The preferred size
   */
  public Dimension preferredLayoutSize(Container parent) {
    Insets insets = parent.getInsets();
    int maxWidth = 0;
    int totalHeight = 0;
    int numComponents = parent.getComponentCount();

    for (int i = 0; i < numComponents; ++i) {
      Component c = parent.getComponent(i);

      if (c.isVisible()) {
        Dimension cd = c.getPreferredSize();

        maxWidth = Math.max(maxWidth, cd.width);
        totalHeight += cd.height;
      } 
    } 
    Dimension td = new Dimension(maxWidth + insets.left + insets.right, 
                                 totalHeight + insets.top + insets.bottom 
                                 + vgap * numComponents);

    return td;
  } 

  /** removeLayoutComponent method comment.
   * @param comp The component
   */
  public void removeLayoutComponent(Component comp) {
  } 

}