/* PictureTime.java - This example illustrates the hierarchical use
   of components in a grid layout.
   Author:  Meryem Ispirli  Revised:  Nancy McCracken 7/21/97
*/

import java.awt.*;

public class PictureTime extends java.applet.Applet {

/* instance variable to hold the subpanel component */  
  ControlPanel control;

/* instance variable to hold the canvas component */
  Canvas displaycanvas;


  public void init() {  
    
  /* using grid layout with gap of 15 points separating each component */
    setLayout(new GridLayout(1,2,15,15)); 
   
    displaycanvas = new Canvas();  /* creating the canvas component */
    displaycanvas.setBackground(Color.blue); 
    
  /* creating instance for PictureControl panel */
    control = new ControlPanel(this);

  /* adding the components to the panel */
    add(displaycanvas);  
    add(control);
  }
  
  public Insets insets() {
    return new Insets(20,0,20,0);
  }

  void changeCanvasColor(String category) {
    if (category.equals("Turkiye")) 
                displaycanvas.setBackground(Color.magenta);
    else if (category.equals("San Diego")) 
                displaycanvas.setBackground(Color.cyan);
    else if (category.equals("Syracuse")) 
                displaycanvas.setBackground(Color.pink);
    else displaycanvas.setBackground(Color.black);
  }
}

/* this class is a subclass of Panel */

class ControlPanel extends Panel { 
/* instance variable to hold a pointer to calling class */
  PictureTime outerparent;

/* the three control buttons */
  Button t, d, s;   
  
  ControlPanel(PictureTime target) {
    this.outerparent = target;
    setLayout(new GridLayout(3,1,0,60));
    
    /* putting the buttons */
    setBackground(Color.lightGray);
    t=new Button("Turkiye");
    add(t);
    t.setForeground(Color.white);
    t.setBackground(Color.magenta);
    d=new Button("San Diego");
    add(d);
    d.setForeground(Color.blue);
    d.setBackground(Color.cyan);
    s=new Button("Syracuse");
    add(s);
    s.setForeground(Color.black);
    s.setBackground(Color.pink);
  }
  
  public boolean action(Event evt, Object arg) {
    if (evt.target instanceof Button)
      this.outerparent.changeCanvasColor((String)arg);
    return true;
  }
}