PC Online 1998 January/PCO0198.ISO/1&1/java.z/java_301/java/awt/BorderLayout.class

Java Class File | 1996-10-20 | 4.1 KB | 174 lines

package java.awt;

public class BorderLayout implements LayoutManager {
   int hgap;
   int vgap;
   Component north;
   Component west;
   Component east;
   Component south;
   Component center;

   public BorderLayout() {
   }

   public BorderLayout(int hgap, int vgap) {
      this.hgap = hgap;
      this.vgap = vgap;
   }

   public void addLayoutComponent(String name, Component comp) {
      if ("Center".equals(name)) {
         this.center = comp;
      } else if ("North".equals(name)) {
         this.north = comp;
      } else if ("South".equals(name)) {
         this.south = comp;
      } else if ("East".equals(name)) {
         this.east = comp;
      } else {
         if ("West".equals(name)) {
            this.west = comp;
         }

      }
   }

   public void removeLayoutComponent(Component comp) {
      if (comp == this.center) {
         this.center = null;
      } else if (comp == this.north) {
         this.north = null;
      } else if (comp == this.south) {
         this.south = null;
      } else if (comp == this.east) {
         this.east = null;
      } else {
         if (comp == this.west) {
            this.west = null;
         }

      }
   }

   public Dimension minimumLayoutSize(Container target) {
      Dimension dim = new Dimension(0, 0);
      if (this.east != null && this.east.visible) {
         Dimension d = this.east.minimumSize();
         dim.width += d.width + this.hgap;
         dim.height = Math.max(d.height, dim.height);
      }

      if (this.west != null && this.west.visible) {
         Dimension d = this.west.minimumSize();
         dim.width += d.width + this.hgap;
         dim.height = Math.max(d.height, dim.height);
      }

      if (this.center != null && this.center.visible) {
         Dimension d = this.center.minimumSize();
         dim.width += d.width;
         dim.height = Math.max(d.height, dim.height);
      }

      if (this.north != null && this.north.visible) {
         Dimension d = this.north.minimumSize();
         dim.width = Math.max(d.width, dim.width);
         dim.height += d.height + this.vgap;
      }

      if (this.south != null && this.south.visible) {
         Dimension d = this.south.minimumSize();
         dim.width = Math.max(d.width, dim.width);
         dim.height += d.height + this.vgap;
      }

      Insets insets = target.insets();
      dim.width += insets.left + insets.right;
      dim.height += insets.top + insets.bottom;
      return dim;
   }

   public Dimension preferredLayoutSize(Container target) {
      Dimension dim = new Dimension(0, 0);
      if (this.east != null && this.east.visible) {
         Dimension d = this.east.preferredSize();
         dim.width += d.width + this.hgap;
         dim.height = Math.max(d.height, dim.height);
      }

      if (this.west != null && this.west.visible) {
         Dimension d = this.west.preferredSize();
         dim.width += d.width + this.hgap;
         dim.height = Math.max(d.height, dim.height);
      }

      if (this.center != null && this.center.visible) {
         Dimension d = this.center.preferredSize();
         dim.width += d.width;
         dim.height = Math.max(d.height, dim.height);
      }

      if (this.north != null && this.north.visible) {
         Dimension d = this.north.preferredSize();
         dim.width = Math.max(d.width, dim.width);
         dim.height += d.height + this.vgap;
      }

      if (this.south != null && this.south.visible) {
         Dimension d = this.south.preferredSize();
         dim.width = Math.max(d.width, dim.width);
         dim.height += d.height + this.vgap;
      }

      Insets insets = target.insets();
      dim.width += insets.left + insets.right;
      dim.height += insets.top + insets.bottom;
      return dim;
   }

   public void layoutContainer(Container target) {
      Insets insets = target.insets();
      int top = insets.top;
      int bottom = target.height - insets.bottom;
      int left = insets.left;
      int right = target.width - insets.right;
      if (this.north != null && this.north.visible) {
         this.north.resize(right - left, this.north.height);
         Dimension d = this.north.preferredSize();
         this.north.reshape(left, top, right - left, d.height);
         top += d.height + this.vgap;
      }

      if (this.south != null && this.south.visible) {
         this.south.resize(right - left, this.south.height);
         Dimension d = this.south.preferredSize();
         this.south.reshape(left, bottom - d.height, right - left, d.height);
         bottom -= d.height + this.vgap;
      }

      if (this.east != null && this.east.visible) {
         this.east.resize(this.east.width, bottom - top);
         Dimension d = this.east.preferredSize();
         this.east.reshape(right - d.width, top, d.width, bottom - top);
         right -= d.width + this.hgap;
      }

      if (this.west != null && this.west.visible) {
         this.west.resize(this.west.width, bottom - top);
         Dimension d = this.west.preferredSize();
         this.west.reshape(left, top, d.width, bottom - top);
         left += d.width + this.hgap;
      }

      if (this.center != null && this.center.visible) {
         this.center.reshape(left, top, right - left, bottom - top);
      }

   }

   public String toString() {
      return this.getClass().getName() + "[hgap=" + this.hgap + ",vgap=" + this.vgap + "]";
   }
}