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

/**
*This class implements the control strip.
*It captures the users changes to the shape
*choice controls, and calls upon the appropriate
*function in the whiteBoard class to acknowledge 
*the changes.
*It also implements the reset button which clears
*the drawing area on the whiteBoard object
*/
public class controlStrip extends Panel {


  whiteBoard target;
 // declare the choice controls 
 Choice shapeChoice, colorChoice, fillChoice;
 Button resetButton;



/**
* controlStrip class constructor,
* it initializes the controlStrip object
*/
  public controlStrip(whiteBoard target) {
    // sets the target to the whiteBoard object
    this.target = target;
    // sets the font
    setFont(new Font("Helvetica", Font.BOLD, 15));
    
    // populates the color pull-down menu
    colorChoice = new Choice();
    colorChoice.addItem("Green");
    colorChoice.addItem("Blue");
    colorChoice.addItem("Yellow");
    
    // populates the shape pull-down menu
    shapeChoice = new Choice();
    shapeChoice.addItem("Line");
    shapeChoice.addItem("Rectangle");
    shapeChoice.addItem("Ellipse");
    

    // populates the style pull-down menu
    fillChoice = new Choice();
    fillChoice.addItem("Filled");
    fillChoice.addItem("Hollow");

    resetButton = new Button("Reset");
   
    // add the actual controls to the stripControl panel
    add(shapeChoice);
    add(colorChoice);
    add(fillChoice);
    add(resetButton);
  }
  /*-----------------------------------------------*/
  /** This function detects the controls' changes 
    * in the controlStrip panel.  According to the  
    * change, the appropriate function in the       
    * whiteBoard class is called (using the target  
    * variable set when initializing the class)     
    * to implement the change.                      */
  /*-----------------------------------------------*/
 
  public boolean action(Event event, Object object) {
    
    
    if (event.target == shapeChoice) {
    // The user changed the actual shape
      // determine selected shape
      String selection = shapeChoice.getSelectedItem();
      // change the shape on the whiteboard accordingly
      target.changeShape(selection); 
      return(true); 
    } else if (event.target == colorChoice) {   
    // The user changed the color  
      // determine selected color
      String selection = colorChoice.getSelectedItem();
      // change the color on the whiteboard accordingly 
      target.changeColor(selection); 
      return(true); 
    } else if (event.target == fillChoice) {
    // The user changed the fill style
      // determine selected fill style 
      String selection = fillChoice.getSelectedItem();
      // change the style on the whiteboard accordingly 
      target.changeFillColor(selection); 
      return(true); 
    } else if (event.target == resetButton) { 
    // The user cleared the drawing area
      // clear all the drawing area 
      target.clearDrawingArea(); 
      return(true); 

    }else    
      return(false);
    }


}