tim/prune/gui/GuiGridLayout.java

   1 package tim.prune.gui;
   2
   3 import java.awt.GridBagConstraints;
   4 import java.awt.GridBagLayout;
   5 import java.awt.Insets;
   6
   7 import javax.swing.JComponent;
   8 import javax.swing.JPanel;
   9
  10 /**
  11  * Class to make it easier to use GridBagLayout
  12  * for a two-column, non-equal-width layout
  13  */
  14 public class GuiGridLayout
  15 {
  16         private GridBagLayout _layout = null;
  17         private GridBagConstraints _constraints = null;
  18         private JPanel _panel = null;
  19         private boolean _allLeft = false;
  20         private int _x = 0;
  21         private int _y = 0;
  22
  23         /**
  24          * Constructor
  25          * @param inPanel panel using layout
  26          */
  27         public GuiGridLayout(JPanel inPanel)
  28         {
  29                 this(inPanel, false);
  30         }
  31
  32         /**
  33          * Constructor
  34          * @param inPanel panel using layout
  35          * @param inAllLeft true to align all elements to left
  36          */
  37         public GuiGridLayout(JPanel inPanel, boolean inAllLeft)
  38         {
  39                 _panel = inPanel;
  40                 _allLeft = inAllLeft;
  41                 _layout = new GridBagLayout();
  42                 _constraints = new GridBagConstraints();
  43                 _constraints.weightx = 1.0;
  44                 _constraints.weighty = 0.0;
  45                 _constraints.ipadx = 10;
  46                 _constraints.ipady = 1;
  47                 _constraints.insets = new Insets(1, 5, 1, 5);
  48                 // Apply layout to panel
  49                 _panel.setLayout(_layout);
  50         }
  51
  52         /**
  53          * Add the given component to the grid
  54          * @param inComponent component to add
  55          */
  56         public void add(JComponent inComponent)
  57         {
  58                 _constraints.gridx = _x;
  59                 _constraints.gridy = _y;
  60                 _constraints.weightx = (_x==0?0.5:1.0);
  61                 // set anchor
  62                 _constraints.anchor = ((_x == 0 && !_allLeft)?GridBagConstraints.LINE_END:GridBagConstraints.LINE_START);
  63                 _layout.setConstraints(inComponent, _constraints);
  64                 // add to panel
  65                 _panel.add(inComponent);
  66                 // work out next position
  67                 _x++;
  68                 if (_x > 1) {
  69                         _x = 0;
  70                         _y++;
  71                 }
  72         }
  73 }