/** 
  * Search Engine Applet 1.0.1
  * @author Robert John Morton
  * @version 22 October 1999 modified 10 July 2009, 10 April 2012
    JFramed Sat 04 Mar 2017 11:46:52 BRT 
  * @copyright Robert John Morton (all rights reserved) */

import javax.swing.*;  // Swing GUI
import java.awt.*;     // for graphics operations (GUI)
import java.net.*;     // for downloading data from the remote server


public class img2panel extends JPanel{  // MESSAGE DISPLAY PANEL

  private static final Font  // Fonts for message summary number and URL
    font1 = new Font("Sans",Font.BOLD,14),
    font2 = new Font("Sans",Font.PLAIN,12);

  private Color bg;         // background colour for the message panel
  private String msg = "";  // string to hold the displayed message text
  private search hf;        // instance reference of the search applet

  private boolean 
    redMsg = false,        // true = display message in red lettering
    imagesLoaded = false,  // true once images have been loaded
    smallFont = true;      // true = print message in the small font size

  private int 
    W, H,  // width and height of message panel
    h,     // height of the text base-line common
    h1,    // height of the text base-line for big font
    h2;    // height of the text base-line for small font


  // INSTANCE CONSTRUCTOR
  img2panel(int W, int H, Color bg, search hf) {
    this.W = W;    // set width of message panel to local variable
    this.H = H;    // set height of message panel to local variable
    this.bg = bg;  // set panel's background colour to local variable
    this.hf = hf;  // copy applet's instance reference to local variable

    /* compute the baseline 'h' for each font for 
    lettering within a panel of height 'H' */

    FontMetrics fm1 = getFontMetrics(font1); 
    h1 = fm1.getAscent() + (H - fm1.getHeight()) / 2;
    FontMetrics fm2 = getFontMetrics(font2); 
    h2 = fm2.getAscent() + (H - fm2.getHeight()) / 2;
  }


  void setImagesLoaded(){imagesLoaded = true;}


  // NORMAL MESSAGES (INCLUDING ERROR MESSAGES)
  void showMsg(String msg, boolean redMsg) {
    this.msg = msg;        // copy message to local variables
    this.redMsg = redMsg;  // and also its display colour switch
    if(redMsg)             // a red (error) message tends to be long
      smallFont = true;    // so display it in a small font
    else 
      smallFont = false;   // display a normal message in the large font
    repaint();             // schedule a repaint via event despatching thread
  }


  // SHOW URL OF HTML PAGE FROM WHICH SUMMARY WAS RETRIEVED
  void showURL(URL url) {
    msg = "" + url;    // convert the URL to a string
    redMsg = false;    // URLs do not appear in red
    smallFont = true;  // they tend to be long, so use a small font
    repaint();         // schedule a repaint via event despatching thread
  }


  // DISPLAY MESSAGE IN MESSAGE PANEL
  public void paint(Graphics g) {
    if(imagesLoaded)                  // If images now loaded, draw back-
      g.drawImage(hf.IMG2,0,0,this);  // ground image onto applet canvas.
    else {
      g.setColor(bg);       // set background colour for message display area
      g.fillRect(0,0,W,H);  // wipe message display area
    }
    if(smallFont) {
      g.setFont(font2);  // set the small font active
      h = h2;            // set baseline height for the small font
    } else {
      g.setFont(font1);  // set the big font active
      h = h1;            // set baseline height for the big font
    }
    if(redMsg)                //if the message should be displayed in red
      g.setColor(Color.red);  //set text foreground colour to red (error)
    else
      g.setColor(Color.black);  //set text foreground colour to black
    g.drawString(msg,5,h);      //draw the message string
  }
}