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1upmodrcon » modrcon » VerticalFlowLayout.java
//----------------------------------------------------
// Image Mover
// (C) Vassili Dzuba, 2000
// distributed under the Artistic License
//----------------------------------------------------

package modrcon;

import java.awt.LayoutManager;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.Insets;

/**
 *  A vertical flow layout is similar to a flow layuot but it layouts the
 *  components vertically instead of horizontally.
 *
 * @author     Vassili Dzuba
 * @since      March 24, 2001
 */
public class VerticalFlowLayout implements LayoutManager, java.io.Serializable {

  int _halign;
  int _valign;
  int _hgap;
  int _vgap;

  /**
   *  Description of the Field
   */
  public final static int TOP = 0;
  /**
   *  Description of the Field
   */
  public final static int CENTER = 1;
  /**
   *  Description of the Field
   */
  public final static int BOTTOM = 2;
  /**
   *  Description of the Field
   */
  public final static int LEFT = 3;
  /**
   *  Description of the Field
   */
  public final static int RIGHT = 4;


  /**
   *  Constructor for the VerticalFlowLayout object
   */
  public VerticalFlowLayout() {
     this(CENTER, CENTER, 5, 5);
  }


  /**
   *  Constructor for the VerticalFlowLayout object
   *
   *@param  halign  Description of Parameter
   *@param  valign  Description of Parameter
   */
  public VerticalFlowLayout(int halign, int valign) {
    this(halign, valign, 5, 5);
  }


  /**
   *  Constructor for the VerticalFlowLayout object
   *
   *@param  halign  Description of Parameter
   *@param  valign  Description of Parameter
   *@param  hgap    Description of Parameter
   *@param  vgap    Description of Parameter
   */
  public VerticalFlowLayout(int halign, int valign, int hgap, int vgap) {
    _hgap = hgap;
    _vgap = vgap;
    setAlignment(halign, valign);
  }


  /**
   *  Sets the Alignment attribute of the VerticalFlowLayout object
   *
   *@param  halign  The new Alignment value
   *@param  valign  The new Alignment value
   */
  public void setAlignment(int halign, int valign) {
    _halign = halign;
    _valign = valign;
  }


  /**
   *  Sets the Hgap attribute of the VerticalFlowLayout object
   *
   *@param  hgap  The new Hgap value
   */
  public void setHgap(int hgap) {
    _hgap = hgap;
  }


  /**
   *  Sets the Vgap attribute of the VerticalFlowLayout object
   *
   *@param  vgap  The new Vgap value
   */
  public void setVgap(int vgap) {
    _vgap = vgap;
  }


  /**
   *  Gets the Halignment attribute of the VerticalFlowLayout object
   *
   *@return    The Halignment value
   */
  public int getHalignment() {
    return _halign;
  }


  /**
   *  Gets the Valignment attribute of the VerticalFlowLayout object
   *
   *@return    The Valignment value
   */
  public int getValignment() {
    return _valign;
  }


  /**
   *  Gets the Hgap attribute of the VerticalFlowLayout object
   *
   *@return    The Hgap value
   */
  public int getHgap() {
    return _hgap;
  }


  /**
   *  Gets the Vgap attribute of the VerticalFlowLayout object
   *
   *@return    The Vgap value
   */
  public int getVgap() {
    return _vgap;
  }


  /**
   *  Adds a feature to the LayoutComponent attribute of the VerticalFlowLayout
   *  object
   *
   *@param  name  The feature to be added to the LayoutComponent attribute
   *@param  comp  The feature to be added to the LayoutComponent attribute
   */
  public void addLayoutComponent(String name, Component comp) {
  }


  /**
   *  Description of the Method
   *
   *@param  comp  Description of Parameter
   */
  public void removeLayoutComponent(Component comp) {
  }


  /**
   *  Description of the Method
   *
   *@param  target  Description of Parameter
   *@return         Description of the Returned Value
   */
  public Dimension preferredLayoutSize(Container target) {
    synchronized (target.getTreeLock()) {
      Dimension dim = new Dimension(0, 0);
      int nmembers = target.getComponentCount();
      boolean firstVisibleComponent = true;

      for (int ii = 0; ii < nmembers; ii++) {
        Component m = target.getComponent(ii);
        if (m.isVisible()) {
          Dimension d = m.getPreferredSize();
          dim.width = Math.max(dim.width, d.width);
          if (firstVisibleComponent) {
            firstVisibleComponent = false;
          }
          else {
            dim.height += _vgap;
          }
          dim.height += d.height;
        }
      }
      Insets insets = target.getInsets();
      dim.width += insets.left + insets.right + _hgap * 2;
      dim.height += insets.top + insets.bottom + _vgap * 2;
      return dim;
    }
  }


  /**
   *  Description of the Method
   *
   *@param  target  Description of Parameter
   *@return         Description of the Returned Value
   */
  public Dimension minimumLayoutSize(Container target) {
    synchronized (target.getTreeLock()) {
      Dimension dim = new Dimension(0, 0);
      int nmembers = target.getComponentCount();
      boolean firstVisibleComponent = true;

      for (int ii = 0; ii < nmembers; ii++) {
        Component m = target.getComponent(ii);
        if (m.isVisible()) {
          Dimension d = m.getPreferredSize();
          dim.width = Math.max(dim.width, d.width);
          if (firstVisibleComponent) {
            firstVisibleComponent = false;
          }
          else {
            dim.height += _vgap;
          }
          dim.height += d.height;
        }
      }
      Insets insets = target.getInsets();
      dim.width += insets.left + insets.right + _hgap * 2;
      dim.height += insets.top + insets.bottom + _vgap * 2;
      return dim;
    }
  }


  /**
   *  Description of the Method
   *
   *@param  target  Description of Parameter
   */
  public void layoutContainer(Container target) {
    synchronized (target.getTreeLock()) {
      Insets insets = target.getInsets();
      int maxheight = target.getHeight() - (insets.top + insets.bottom + _vgap * 2);
      int nmembers = target.getComponentCount();
      int y = 0;

      Dimension preferredSize = preferredLayoutSize(target);
      Dimension targetSize = target.getSize();

      switch (_valign) {
        case TOP:
          y = insets.top;
          break;
        case CENTER:
          y = (targetSize.height - preferredSize.height) / 2;
          break;
        case BOTTOM:
          y = targetSize.height - preferredSize.height - insets.bottom;
          break;
      }

      for (int i = 0; i < nmembers; i++) {
        Component m = target.getComponent(i);
        if (m.isVisible()) {
          Dimension d = m.getPreferredSize();
          m.setSize(d.width, d.height);

          if ((y + d.height) <= maxheight) {
            if (y > 0) {
              y += _vgap;
            }

            int x = 0;
            switch (_halign) {
              case LEFT:
                x = insets.left;
                break;
              case CENTER:
                x = (targetSize.width - d.width) / 2;
                break;
              case RIGHT:
                x = targetSize.width - d.width - insets.right;
                break;
            }

            m.setLocation(x, y);

            y += d.getHeight();

          }
          else {
            break;
          }
        }
      }
    }
  }


  /** {@inheritDoc} */
  @Override public String toString() {
    String halign = "";
    switch (_halign) {
      case TOP:
        halign = "top";
        break;
      case CENTER:
        halign = "center";
        break;
      case BOTTOM:
        halign = "bottom";
        break;
    }
    String valign = "";
    switch (_valign) {
      case TOP:
        valign = "top";
        break;
      case CENTER:
        valign = "center";
        break;
      case BOTTOM:
        valign = "bottom";
        break;
    }
    return getClass().getName() + "[hgap=" + _hgap + ",vgap=" + _vgap + ",halign=" + halign + ",valign=" + valign + "]";
  }
}
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