import java.applet.*;
import java.awt.*;

public class EventTester extends Applet {

  // Display the instructions
  public void paint(Graphics g) {
    g.drawString("Click, drag, and type in this window.",10,20);
  }

  // Handle mouse events
  public boolean mouseDown(Event e, int x, int y) {
    showStatus(modifier_key_names(e.modifiers) + 
	       "Mouse Down:["+x+","+y+"]");
    return true;
  }

  public boolean mouseUp(Event e, int x, int y) {
    showStatus(modifier_key_names(e.modifiers) +
	       "Mouse Up:["+x+","+y+"]");
    return true;
  }

  public boolean mouseDrag(Event e, int x, int y){
    showStatus(modifier_key_names(e.modifiers) +
	       "Mouse Drag: ["+x+","+y+"]");
    return true;
  }

  public boolean mouseEnter(Event e, int x, int y){
    showStatus("Mouse Enter: ["+x+","+y+"]");
    return true;
  }

  public boolean mouseExit(Event e, int x, int y){
    showStatus("Mouse Exit: ["+x+","+y+"]");
    return true;
  }

  // Handle focus events
  public boolean gotFocus(Event e, Object what) {
    showStatus("Got Focus");
    return true;
  }

  public boolean lostFocus(Event e, Object what) {
    showStatus("Lost Focus");
    return true;
  }

  // Handle key down and key up events
  public boolean keyDown(Event e, int key) {
    int flags = e.modifiers;
    if (e.id == Event.KEY_PRESS)         // a regular key
      showStatus("Key Down: " +
		 modifier_key_names(flags) +
		 key_name(e));
    else if (e.id == Event.KEY_ACTION)   // a function key
      showStatus("Function Key Down: " +
		 modifier_key_names(flags) +
		 function_key_name(key));
    return true;
  }

  public boolean keyUp(Event e, int key) {
    int flags = e.modifiers;
    if (e.id == Event.KEY_PRESS)       // a regular key
      showStatus("Key Up: " +
		 modifier_key_names(flags) +
		 key_name(e));
    else if (e.id == Event.KEY_ACTION)  // a function key
      showStatus("Function Key Up: " +
		 modifier_key_names(flags) +
		 function_key_name(key));
    return true;
  }

  // The remaining methods help us sort out the various key events

  // Return the current list of modifier keys
  private String modifier_key_names(int flags) {
    String s = "[";
    if (flags==0) return "";
    if ((flags & Event.SHIFT_MASK) != 0) s += "Shift";
    if ((flags & Event.CTRL_MASK) != 0) s += "Control";
    if ((flags & Event.META_MASK) != 0) s += "Meta";
    if ((flags & Event.ALT_MASK) != 0) s += "Alt";
    s += "]";
    return s;
  }

  // Return the name of a regular (ASCII) key
  private String key_name(Event e) {
    char c = (char)e.key;

    // if CTRL flag is set, handle ASCII control characters.
    if (e.controlDown()) {
      if (c<' ') {
	c += '@';
	return "^" + c;
      }
    }
    else {
      // if CTRL flag is not set, then certain ASCII
      // control characters have special meaning
      switch (c) {
      case '\n': return "Return";
      case '\t': return "Tab";
      case '\033': return "Escape";
      case '\010': return "Backspace";
      }
    }

    // Handle the remaining possibilities.
    if (c == '\177') return "Delete";
    else if (c == ' ') return "Space";
    else return String.valueOf(c);
  }

  // Return the name of a function key.
  private String function_key_name(int key) {
    switch(key) {
    case Event.HOME: return "Home";
    case Event.END: return "End";
    case Event.PGUP: return "Page Up";
    case Event.PGDN: return "Page Down";
    case Event.UP: return "Up Arrow";
    case Event.DOWN: return "Down Arrow";
    case Event.LEFT: return "Left Arrow";
    case Event.RIGHT: return "Right Arrow";
    case Event.F1: return "F1"; case Event.F2: return "F2";
    case Event.F3: return "F3"; case Event.F4: return "F4";
    case Event.F5: return "F5"; case Event.F6: return "F6";
    case Event.F7: return "F7"; case Event.F8: return "F8";
    case Event.F9: return "F9"; case Event.F10: return "F10";
    case Event.F11: return "F11"; case Event.F12: return "F12";
    }
    return "Unknown Function Key";
  }

}