autoevent.java

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//: AutoEvent.java
// Alternatives to action()
import java.awt.*;
import java.applet.*;
import java.util.*;

class MyButton extends Canvas {
	AutoEvent parent;
	Color color;
	String label;
	MyButton(AutoEvent parent,
		Color color, String label) {
		this.label = label;
		this.parent = parent;
		this.color = color;
	}

	public void paint(Graphics g) {
		g.setColor(color);
		int rnd = 30;
		g.fillRoundRect(0, 0, size().width,
		size().height, rnd, rnd);
		g.setColor(Color.black);
		g.drawRoundRect(0, 0, size().width,
		size().height, rnd, rnd);
		FontMetrics fm = g.getFontMetrics();
		int width = fm.stringWidth(label);
		int height = fm.getHeight();
		int ascent = fm.getAscent();
		int leading = fm.getLeading();
		int horizMargin = (size().width - width)/2;
		int verMargin = (size().height - height)/2;
		g.setColor(Color.white);
		g.drawString(label, horizMargin,
		verMargin + ascent + leading);
	}

	public boolean keyDown(Event evt, int key) {
		TextField t =
			(TextField)parent.h.get("keyDown");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean keyUp(Event evt, int key) {
		TextField t =
			(TextField)parent.h.get("keyUp");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean lostFocus(Event evt, Object w) {
		TextField t =
			(TextField)parent.h.get("lostFocus");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean gotFocus(Event evt, Object w) {
		TextField t =
			(TextField)parent.h.get("gotFocus");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean
		mouseDown(Event evt,int x,int y) {
		TextField t =
			(TextField)parent.h.get("mouseDown");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean
		mouseDrag(Event evt,int x,int y) {
		TextField t =
			(TextField)parent.h.get("mouseDrag");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean
		mouseEnter(Event evt,int x,int y) {
		TextField t =
			(TextField)parent.h.get("mouseEnter");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean
		mouseExit(Event evt,int x,int y) {
		TextField t =
			(TextField)parent.h.get("mouseExit");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean
		mouseMove(Event evt,int x,int y) {
		TextField t =
			(TextField)parent.h.get("mouseMove");
		t.setText(evt.toString());
		return true;
	}
	
	public boolean mouseUp(Event evt,int x,int y) {
		TextField t =
			(TextField)parent.h.get("mouseUp");
		t.setText(evt.toString());
		return true;
	}
}

public class AutoEvent extends Applet {
	Hashtable h = new Hashtable();
	String[] event = {
	"keyDown", "keyUp", "lostFocus",
	"gotFocus", "mouseDown", "mouseUp",
	"mouseMove", "mouseDrag", "mouseEnter",
	"mouseExit"
	};
	MyButton
		b1 = new MyButton(this, Color.blue, "test1"),
		b2 = new MyButton(this, Color.red, "test2");

	public void init() {
		setLayout(new GridLayout(event.length+1,2));
		for(int i = 0; i < event.length; i++) {
			TextField t = new TextField();
			t.setEditable(false);
			add(new Label(event[i], Label.CENTER));
			add(t);
			h.put(event[i], t);
		}
		add(b1);
		add(b2);
	}
} ///:~

//	<applet code=AutoEvent.class width=200 height=200></applet>