globalmappingexample.java

一个用java开发界面的程序集(jfc核心编程)

package JFCBook.Chapter5.jdk13;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GlobalMappingExample {
	public static void main(String[] args) {
		JFrame f = new JFrame("JDK 1.3 Global Mapping Example");
		JPanel upperPane = new JPanel();
		JPanel lowerPane = new JPanel();
		upperPane.setBackground(Color.green);
		lowerPane.setBackground(Color.yellow);
		f.getContentPane().add(upperPane, BorderLayout.CENTER);
		f.getContentPane().add(lowerPane, BorderLayout.SOUTH);

		JButton buttonA = new JButton("A");
		JButton buttonB = new JButton("B");
		JButton buttonC = new JButton("C");
		JButton buttonD = new JButton("D");
		final JTextField tf = new JTextField(32);

		upperPane.add(buttonA);
		upperPane.add(tf);
		lowerPane.add(buttonB);
		lowerPane.add(buttonC);
		lowerPane.add(buttonD);

		f.pack();
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent evt) {
				System.exit(0);
			}
		});
		f.setVisible(true);

		// Create actions and install them

		// (1) F1 anywhere in the window
		AbstractAction a1 = new AbstractAction() {
			public void actionPerformed(ActionEvent evt) {
				tf.setText("F1 somewhere in main window");
			}
		};
		f.getRootPane().getActionMap().put("helpAction", a1);

		// Install the mapping for this action
		f.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
							KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0, false),
							"helpAction");

		//
		// (2) Keys A or D when buttons B, C, D have focus
		AbstractAction a2 = new AbstractAction() {
			public void actionPerformed(ActionEvent evt) {
				tf.setText("A released or D pressed on lower pane button");
			}
		};

		ActionMap actionMap = lowerPane.getActionMap();
		InputMap inputMap = lowerPane.getInputMap(
						JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
		actionMap.put("lowerPaneAction", a2);

		inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0, true),
						"lowerPaneAction");
		inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_D, 0, false),
						"lowerPaneAction");

		// (3) F1 pressed on button in lower pane
		AbstractAction a3 = new AbstractAction() {
			public void actionPerformed(ActionEvent evt) {
				tf.setText("F1 somewhere in lower pane");
			}
		};
		actionMap.put("helpAction", a3);
		inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0, false),
						"helpAction");

		// (4) 'F1' only when text area focused
		AbstractAction a4 = new AbstractAction() {
			public void actionPerformed(ActionEvent evt) {
				tf.setText("F1 pressed in the text area");
			}
		};

		tf.getActionMap().put("helpAction", a4);
		tf.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0, false),
						"helpAction");
	}
}