/** 
  * Bandscope Receiver Applet 1.0.0 [MESSAGE PANEL]
  * @author Robert J Morton <robmorton@clara.net> YE572246C
  * @version 13 March 2002, 20 March 2012
  * @copyright Robert J Morton (all rights reserved) */

import javax.swing.*;  // swing widgets
import java.awt.*;     // for graphics operations (GUI)

class msgpanel extends JPanel {
  private int 
    W,      // width of message-panel
    H,      // height of message-panel
    h,      // text base line for panel of height H
    I = 5;  // text inset from beginning of text area

  private String msg;              // current time stamp message
  private Color bg;                // background colour
  private boolean RedMsg = false;  // true if message should be shown in red
  private Font font;

  msgpanel(Color bg, Font font, int W, int H) {  // CONSTRUCTOR
    this.bg = bg;      // set panel colour
    this.W = W;        // set panel width
    this.H = H;        // set panel height
    this.font = font;
    //compute baseline 'h' for the lettering within a panel of height 'H'
    FontMetrics fm = getFontMetrics(font); 
    h = fm.getAscent() + (H - fm.getHeight()) /2;
  }

  void showMsg(String s, boolean b) {
    RedMsg = b;  // true if the message should be shown in red
    msg = s;     // message content
    repaint();   // schedule a repaint on the event-despatching thread
  }

  public void paint(Graphics g) {
    g.setColor(bg);          // set background colour for the panel
    g.fillRect(0, 0, W, H);  // clear the bandscope data file time stamp area
    g.setFont(font);         // set the font for this panel

    /* If the message should be shown in red set the print colour
    to red; otherwise, by default, set the print colour to black. */

    if(RedMsg) g.setColor(Color.red); else g.setColor(Color.black);

    g.drawString(msg, I, h);  // display the message
  }
}