gridbaglab.java

swing 教程,与大家分享一下,哈哈,希望大家多多指教

		class AnchorListener extends MouseAdapter {
			public void mouseEntered(MouseEvent event) {
				setHelpViewer("anchor.txt");
			}
		}
		class WeightListener extends MouseAdapter {
			public void mouseEntered(MouseEvent event) {
				setHelpViewer("weight.txt");
			}
		}
		class FillListener extends MouseAdapter {
			public void mouseEntered(MouseEvent event) {
				setHelpViewer("fill.txt");
			}
		}
class AnchorFillWeightPanel extends JPanel {
	JLabel		anchorLabel = new JLabel("Anchor:"),
				fillLabel 	= new JLabel("Fill:"),
				weightxLabel = new JLabel("weightx:"),
				weightyLabel = new JLabel("weighty:");

	JComboBox  	anchorCombo = new JComboBox(),
				fillCombo 	= new JComboBox();

	JComboBox	weightxCombo = new JComboBox(),
				weightyCombo = new JComboBox();

	public AnchorFillWeightPanel() {
		anchorCombo.addItem("NORTH");
		anchorCombo.addItem("NORTHEAST");
		anchorCombo.addItem("EAST");
		anchorCombo.addItem("SOUTHEAST");
		anchorCombo.addItem("SOUTH");
		anchorCombo.addItem("SOUTHWEST");
		anchorCombo.addItem("WEST");
		anchorCombo.addItem("NORTHWEST");
		anchorCombo.addItem("CENTER");

		weightxCombo.addItem("0.0");
		weightxCombo.addItem("0.1");
		weightxCombo.addItem("0.2");
		weightxCombo.addItem("0.25");
		weightxCombo.addItem("0.3");
		weightxCombo.addItem("0.4");
		weightxCombo.addItem("0.5");
		weightxCombo.addItem("0.6");
		weightxCombo.addItem("0.7");
		weightxCombo.addItem("0.75");
		weightxCombo.addItem("0.8");
		weightxCombo.addItem("0.9");
		weightxCombo.addItem("1.0");

		weightyCombo.addItem("0.0");
		weightyCombo.addItem("0.1");
		weightyCombo.addItem("0.2");
		weightyCombo.addItem("0.25");
		weightyCombo.addItem("0.3");
		weightyCombo.addItem("0.4");
		weightyCombo.addItem("0.5");
		weightyCombo.addItem("0.6");
		weightyCombo.addItem("0.7");
		weightyCombo.addItem("0.75");
		weightyCombo.addItem("0.8");
		weightyCombo.addItem("0.9");
		weightyCombo.addItem("1.0");

		fillCombo.addItem("NONE");
		fillCombo.addItem("HORIZONTAL");
		fillCombo.addItem("VERTICAL");
		fillCombo.addItem("BOTH");

		GridBagLayout gbl = new GridBagLayout();
		GridBagConstraints gbc = new GridBagConstraints();

		setLayout(gbl);
		gbc.anchor = GridBagConstraints.NORTHWEST;

		add(anchorLabel, gbc);
		add(Box.createHorizontalStrut(10), gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		gbc.weightx = 1.0;
		add(anchorCombo, gbc);
		gbc.weightx = 0;
		add(Box.createVerticalStrut(3), gbc);

		gbc.gridwidth = 1;
		add(fillLabel, gbc);
		add(Box.createHorizontalStrut(10), gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		gbc.weightx = 1.0;
		add(fillCombo, gbc);
		gbc.weightx = 0;
		add(Box.createVerticalStrut(13), gbc);

		gbc.gridwidth = 1;
		gbc.anchor = GridBagConstraints.WEST;
		add(weightxLabel, gbc);
		add(Box.createHorizontalStrut(10), gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		gbc.weightx = 1.0;
		add(weightxCombo, gbc);
		gbc.weightx = 0;
		add(Box.createVerticalStrut(3), gbc);

		gbc.gridwidth = 1;
		add(weightyLabel, gbc);
		add(Box.createHorizontalStrut(10), gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		gbc.weightx = 1.0;
		add(weightyCombo, gbc);
		gbc.weightx = 0;
		gbc.gridwidth = 1;

		setBorder(new CompoundBorder(
				BorderFactory.createTitledBorder(
					"Anchor, Fill and Weight"),
				BorderFactory.createEmptyBorder(10,10,10,10)));

		fillCombo.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent event) {
				int state = event.getStateChange();			

				if(state == ItemEvent.SELECTED) {
					GridBagConstraints tgbc =
							getConstraints();

					tgbc.fill = getFill();
					setConstraints(tgbc);
				}
			}
		});
		anchorCombo.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent event) {
				int state = event.getStateChange();			

				if(state == ItemEvent.SELECTED) {
					GridBagConstraints tgbc =
							getConstraints();

					tgbc.anchor = getAnchor();
					setConstraints(tgbc);
				}
			}
		});
		weightxCombo.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent event) {
				int state = event.getStateChange();			

				if(state == ItemEvent.SELECTED) {
					GridBagConstraints tgbc =
							getConstraints();

					tgbc.weightx = (getWeightx()).doubleValue();
					setConstraints(tgbc);
				}
			}
		});
		weightyCombo.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent event) {
				int state = event.getStateChange();			

				if(state == ItemEvent.SELECTED) {
					GridBagConstraints tgbc =
							getConstraints();

					tgbc.weighty = (getWeighty()).doubleValue();
					setConstraints(tgbc);
				}
			}
		});
		AnchorListener anchorListener = new AnchorListener();
		WeightListener weightListener = new WeightListener();
		FillListener fillListener = new FillListener();

		anchorLabel.addMouseListener(anchorListener);
		anchorCombo.addMouseListener(anchorListener);

		weightxLabel.addMouseListener(weightListener);
		weightyLabel.addMouseListener(weightListener);

		weightxCombo.addMouseListener(weightListener);
		weightyCombo.addMouseListener(weightListener);

		fillLabel.addMouseListener(fillListener);
		fillCombo.addMouseListener(fillListener);
	}
	public Double getWeightx() {
		return Double.valueOf(
					(String)weightxCombo.getSelectedItem());
	}
	public Double getWeighty() {
		return Double.valueOf(
					(String)weightyCombo.getSelectedItem());
	}
	public void setWeightx(Double d) {
		weightxCombo.setSelectedItem(d.toString());
	}
	public void setWeighty(Double d) {
		weightyCombo.setSelectedItem(d.toString());
	}
	public int getAnchor() {
		String index = (String)anchorCombo.getSelectedItem();
		int anchor = GridBagConstraints.NORTH;

		if("NORTH".equals(index))
			anchor = GridBagConstraints.NORTH;
		else if("NORTHEAST".equals(index))
			anchor = GridBagConstraints.NORTHEAST;
		else if("NORTHWEST".equals(index))
			anchor = GridBagConstraints.NORTHWEST;
		else if("EAST".equals(index))
			anchor = GridBagConstraints.EAST;
		else if("SOUTHEAST".equals(index))
			anchor = GridBagConstraints.SOUTHEAST;
		else if("SOUTH".equals(index))
			anchor = GridBagConstraints.SOUTH;
		else if("SOUTHWEST".equals(index))
			anchor = GridBagConstraints.SOUTHWEST;
		else if("WEST".equals(index))
			anchor = GridBagConstraints.WEST;
		else if("CENTER".equals(index))
			anchor = GridBagConstraints.CENTER;

		return anchor;
	}
	public int getFill() {
		String index = (String)fillCombo.getSelectedItem();
		int fill = GridBagConstraints.NONE;

		if("NONE".equals(index))
			fill = GridBagConstraints.NONE;
		else if("HORIZONTAL".equals(index))
			fill = GridBagConstraints.HORIZONTAL;
		else if("VERTICAL".equals(index))
			fill = GridBagConstraints.VERTICAL;
		else if("BOTH".equals(index))
			fill = GridBagConstraints.BOTH;

		return fill;
	}
	public void setAnchor(int anchor) {
		if(anchor == GridBagConstraints.NORTH)
			anchorCombo.setSelectedItem("NORTH");
		else if(anchor == GridBagConstraints.NORTHEAST)
			anchorCombo.setSelectedItem("NORTHEAST");
		else if(anchor == GridBagConstraints.NORTHWEST)
			anchorCombo.setSelectedItem("NORTHWEST");
		else if(anchor == GridBagConstraints.SOUTH)
			anchorCombo.setSelectedItem("SOUTH");
		else if(anchor == GridBagConstraints.SOUTHEAST)
			anchorCombo.setSelectedItem("SOUTHEAST");
		else if(anchor == GridBagConstraints.SOUTHWEST)
			anchorCombo.setSelectedItem("SOUTHWEST");
		else if(anchor == GridBagConstraints.EAST)
			anchorCombo.setSelectedItem("EAST");
		else if(anchor == GridBagConstraints.WEST)
			anchorCombo.setSelectedItem("WEST");
		else if(anchor == GridBagConstraints.CENTER)
			anchorCombo.setSelectedItem("CENTER");
	}
	public void setFill(int fill) {
		if(fill == GridBagConstraints.NONE)
			fillCombo.setSelectedItem("NONE");
		else if(fill == GridBagConstraints.HORIZONTAL)
			fillCombo.setSelectedItem("HORIZONTAL");
		else if(fill == GridBagConstraints.VERTICAL)
			fillCombo.setSelectedItem("VERTICAL");
		else if(fill == GridBagConstraints.BOTH)
			fillCombo.setSelectedItem("BOTH");
	}
}
class AboutDialog extends JDialog {
	public AboutDialog(JFrame frame) {
		super(frame, "GridBagLab");

		Container contentPane = getContentPane();
		JButton button = new JButton("Ok");

		contentPane.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

		contentPane.add(new JLabel(
			"A Swing application for exploring GridBagLayout"));

		contentPane.add(Box.createVerticalStrut(20));

		contentPane.add(new JLabel(
			"Copyright 1997, Sabreware Inc.",
			new ImageIcon("sabreware.gif"),
			SwingConstants.LEFT));

		contentPane.add(Box.createVerticalStrut(50));
		contentPane.add(button);

		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				dispose();
			}
		});
	}
}
public static void main(String args[]) {
		GJApp.launch(new GridBagLab(), 
					"GridBagLab",200,200,600,500);
}
}
class GJApp extends WindowAdapter {
	static private JPanel statusArea = new JPanel();
	static private JLabel status = new JLabel(" ");
	static private ResourceBundle resources;

	public static void launch(final JFrame f, String title,
							  final int x, final int y, 
							  final int w, int h) {
		launch(f,title,x,y,w,h,null);	
	}
	public static void launch(final JFrame f, String title,
							  final int x, final int y, 
							  final int w, int h,
							  String propertiesFilename) {
		f.setTitle(title);
		f.setBounds(x,y,w,h);
		f.setVisible(true);

		statusArea.setBorder(BorderFactory.createEtchedBorder());
		statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));
		statusArea.add(status);
		status.setHorizontalAlignment(JLabel.LEFT);

		f.setDefaultCloseOperation(
							WindowConstants.DISPOSE_ON_CLOSE);

		if(propertiesFilename != null) {
			resources = ResourceBundle.getBundle(
						propertiesFilename, Locale.getDefault());
		}

		f.addWindowListener(new WindowAdapter() {
			public void windowClosed(WindowEvent e) {
				System.exit(0);
			}
		});
	}
	static public JPanel getStatusArea() {
		return statusArea;
	}
	static public void showStatus(String s) {
		status.setText(s);
	}
	static Object getResource(String key) {
		if(resources != null) {
			return resources.getString(key);
		}
		return null;
	}
}