content: /*
   * Copyright 2006-2013 Alessandro Cocco.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package jcodecollector.gui;
  
  import java.awt.Component;
  import java.awt.Container;
  import java.awt.Dimension;
  import java.awt.FlowLayout;
  import java.awt.Insets;
  
  /**
   * A modified version of FlowLayout that allows containers using this Layout to
   * behave in a reasonable manner when placed inside a JScrollPane
   * 
   * @author Babu Kalakrishnan
   */
  public class ModifiedFlowLayout extends FlowLayout {
      private static final long serialVersionUID = -171022815224628999L;
  
      public ModifiedFlowLayout() {
          super();
      }
  
      public ModifiedFlowLayout(int align) {
          super(align);
      }
  
      public ModifiedFlowLayout(int align, int hgap, int vgap) {
          super(align, hgap, vgap);
      }
  
      public Dimension minimumLayoutSize(Container target) {
          return computeSize(target, false);
      }
  
      public Dimension preferredLayoutSize(Container target) {
          return computeSize(target, true);
      }
  
      private Dimension computeSize(Container target, boolean minimum) {
          synchronized (target.getTreeLock()) {
              int hgap = getHgap();
              int vgap = getVgap();
              int w = target.getWidth();
  
              // Let this behave like a regular FlowLayout (single row)
              // if the container hasn't been assigned any size yet
              if (w == 0)
                  w = Integer.MAX_VALUE;
  
              Insets insets = target.getInsets();
              if (insets == null)
                  insets = new Insets(0, 0, 0, 0);
              int reqdWidth = 0;
  
              int maxwidth = w - (insets.left + insets.right + hgap * 2);
              int n = target.getComponentCount();
              int x = 0;
              int y = insets.top;
              int rowHeight = 0;
  
              for (int i = 0; i < n; i++) {
                  Component c = target.getComponent(i);
                  if (c.isVisible()) {
                      Dimension d = minimum ? c.getMinimumSize()
                              : c.getPreferredSize();
                      if ((x == 0) || ((x + d.width) <= maxwidth)) {
                          if (x > 0) {
                              x += hgap;
                          }
                          x += d.width;
                          rowHeight = Math.max(rowHeight, d.height);
                      } else {
                          x = d.width;
                          y += vgap + rowHeight;
                          rowHeight = d.height;
                      }
                      reqdWidth = Math.max(reqdWidth, x);
                  }
              }
              y += rowHeight;
              return new Dimension(reqdWidth + insets.left + insets.right, y);
          }
      }
  }
  