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import java.awt.*; | |
/** | |
* This class simplifies the use of the GridBagConstraints class. | |
*/ | |
public class GBC extends GridBagConstraints | |
{ | |
/** | |
* Constructs a GBC with a given gridx and gridy position and all other grid | |
* bag constraint values set to the default. | |
* @param gridx the gridx position | |
* @param gridy the gridy position | |
*/ | |
public GBC(int gridx, int gridy) | |
{ | |
this.gridx = gridx; | |
this.gridy = gridy; | |
} | |
/** | |
* Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all | |
* other grid bag constraint values set to the default. | |
* @param gridx the gridx position | |
* @param gridy the gridy position | |
* @param gridwidth the cell span in x-direction | |
* @param gridheight the cell span in y-direction | |
*/ | |
public GBC(int gridx, int gridy, int gridwidth, int gridheight) | |
{ | |
this.gridx = gridx; | |
this.gridy = gridy; | |
this.gridwidth = gridwidth; | |
this.gridheight = gridheight; | |
} | |
/** | |
* Sets the anchor. | |
* @param anchor the anchor value | |
* @return this object for further modification | |
*/ | |
public GBC setAnchor(int anchor) | |
{ | |
this.anchor = anchor; | |
return this; | |
} | |
/** | |
* Sets the fill direction. | |
* @param fill the fill direction | |
* @return this object for further modification | |
*/ | |
public GBC setFill(int fill) | |
{ | |
this.fill = fill; | |
return this; | |
} | |
/** | |
* Sets the cell weights. | |
* @param weightx the cell weight in x-direction | |
* @param weighty the cell weight in y-direction | |
* @return this object for further modification | |
*/ | |
public GBC setWeight(double weightx, double weighty) | |
{ | |
this.weightx = weightx; | |
this.weighty = weighty; | |
return this; | |
} | |
/** | |
* Sets the insets of this cell. | |
* @param distance the spacing to use in all directions | |
* @return this object for further modification | |
*/ | |
public GBC setInsets(int distance) | |
{ | |
this.insets = new Insets(distance, distance, distance, distance); | |
return this; | |
} | |
/** | |
* Sets the insets of this cell. | |
* @param top the spacing to use on top | |
* @param left the spacing to use to the left | |
* @param bottom the spacing to use on the bottom | |
* @param right the spacing to use to the right | |
* @return this object for further modification | |
*/ | |
public GBC setInsets(int top, int left, int bottom, int right) | |
{ | |
this.insets = new Insets(top, left, bottom, right); | |
return this; | |
} | |
/** | |
* Sets the internal padding | |
* @param ipadx the internal padding in x-direction | |
* @param ipady the internal padding in y-direction | |
* @return this object for further modification | |
*/ | |
public GBC setIpad(int ipadx, int ipady) | |
{ | |
this.ipadx = ipadx; | |
this.ipady = ipady; | |
return this; | |
} | |
} |
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import java.awt.*; | |
import java.awt.event.*; | |
import javax.swing.*; | |
public class GridBagLayoutTest | |
{ | |
public static void main(String[] args) | |
{ | |
EventQueue.invokeLater(new Runnable() | |
{ | |
public void run() | |
{ | |
FontFrame frame = new FontFrame(); | |
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); | |
frame.setVisible(true); | |
} | |
}); | |
} | |
} | |
/** | |
* A frame that uses a grid bag layout to arrange font selection components. | |
*/ | |
class FontFrame extends JFrame | |
{ | |
public FontFrame() | |
{ | |
setTitle("GridBagLayoutTest"); | |
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); | |
GridBagLayout layout = new GridBagLayout(); | |
setLayout(layout); | |
ActionListener listener = new FontAction(); | |
// construct components | |
JLabel faceLabel = new JLabel("Face: "); | |
face = new JComboBox(new String[] { "Serif", "SansSerif", "Monospaced", "Dialog", | |
"DialogInput" }); | |
face.addActionListener(listener); | |
JLabel sizeLabel = new JLabel("Size: "); | |
size = new JComboBox(new String[] { "8", "10", "12", "15", "18", "24", "36", "48" }); | |
size.addActionListener(listener); | |
bold = new JCheckBox("Bold"); | |
bold.addActionListener(listener); | |
italic = new JCheckBox("Italic"); | |
italic.addActionListener(listener); | |
sample = new JTextArea(); | |
sample.setText("The quick brown fox jumps over the lazy dog"); | |
sample.setEditable(false); | |
sample.setLineWrap(true); | |
sample.setBorder(BorderFactory.createEtchedBorder()); | |
// add components to grid, using GBC convenience class | |
add(faceLabel, new GBC(0, 0).setAnchor(GBC.EAST)); | |
add(face, new GBC(1, 0).setFill(GBC.HORIZONTAL).setWeight(100, 0).setInsets(1)); | |
add(sizeLabel, new GBC(0, 1).setAnchor(GBC.EAST)); | |
add(size, new GBC(1, 1).setFill(GBC.HORIZONTAL).setWeight(100, 0).setInsets(1)); | |
add(bold, new GBC(0, 2, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100)); | |
add(italic, new GBC(0, 3, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100)); | |
add(sample, new GBC(2, 0, 1, 4).setFill(GBC.BOTH).setWeight(100, 100)); | |
} | |
public static final int DEFAULT_WIDTH = 300; | |
public static final int DEFAULT_HEIGHT = 200; | |
private JComboBox face; | |
private JComboBox size; | |
private JCheckBox bold; | |
private JCheckBox italic; | |
private JTextArea sample; | |
/** | |
* An action listener that changes the font of the sample text. | |
*/ | |
private class FontAction implements ActionListener | |
{ | |
public void actionPerformed(ActionEvent event) | |
{ | |
String fontFace = (String) face.getSelectedItem(); | |
int fontStyle = (bold.isSelected() ? Font.BOLD : 0) | |
+ (italic.isSelected() ? Font.ITALIC : 0); | |
int fontSize = Integer.parseInt((String) size.getSelectedItem()); | |
Font font = new Font(fontFace, fontStyle, fontSize); | |
sample.setFont(font); | |
sample.repaint(); | |
} | |
} | |
} |
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