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package tim.prune.gui;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JComponent;
import javax.swing.JPanel;
/**
* Class to make it easier to use GridBagLayout for a non-equal-width layout
* Default is two columns but can handle more
*/
public class GuiGridLayout
{
private GridBagLayout _layout = null;
private GridBagConstraints _constraints = null;
private JPanel _panel = null;
private int _numColumns = 0;
private double[] _colWeights = null;
private boolean[] _rightAligns = null;
private int _x = 0;
private int _y = 0;
/**
* Constructor
* @param inPanel panel using layout
*/
public GuiGridLayout(JPanel inPanel)
{
// Default is two columns, with more weight to the right-hand one; first column is right-aligned
this(inPanel, null, null);
}
/**
* Constructor
* @param inPanel panel using layout
* @param inColumnWeights array of column weights
* @param inAlignRights array of booleans, true for right alignment, false for left
*/
public GuiGridLayout(JPanel inPanel, double[] inColumnWeights, boolean[] inAlignRights)
{
_panel = inPanel;
_layout = new GridBagLayout();
_constraints = new GridBagConstraints();
_colWeights = inColumnWeights;
_rightAligns = inAlignRights;
if (_colWeights == null || _rightAligns == null || _colWeights.length != _rightAligns.length
|| _colWeights.length < 2)
{
_colWeights = new double[] {0.5, 1.0};
_rightAligns = new boolean[] {true, false};
}
_numColumns = _colWeights.length;
_constraints.weightx = 1.0;
_constraints.weighty = 0.0;
_constraints.ipadx = 10;
_constraints.ipady = 1;
_constraints.insets = new Insets(1, 5, 1, 5);
// Apply layout to panel
_panel.setLayout(_layout);
}
/**
* Add the given component to the grid
* @param inComponent component to add
*/
public void add(JComponent inComponent)
{
_constraints.gridx = _x;
_constraints.gridy = _y;
_constraints.weightx = _colWeights[_x];
// set anchor
_constraints.anchor = (_rightAligns[_x]?GridBagConstraints.LINE_END:GridBagConstraints.LINE_START);
_layout.setConstraints(inComponent, _constraints);
// add to panel
_panel.add(inComponent);
// work out next position
_x++;
if (_x >= _numColumns) {
nextRow();
}
}
/**
* Go to the next row of the grid
*/
public void nextRow()
{
_x = 0;
_y++;
}
}
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