[Firebug-cvs] firebug/project/zaurus/vu/isis/nest/zaurus ZCanvas.java,NONE,1.1 ZMain.java,1.2,1.3

[<do...@us...>]

Update of /cvsroot/firebug/firebug/project/zaurus/vu/isis/nest/zaurus
In directory sc8-pr-cvs1:/tmp/cvs-serv5386/vu/isis/nest/zaurus

Modified Files:
	ZMain.java 
Added Files:
	ZCanvas.java 
Log Message:
Added a canvas class for deriving zaurus widgets.

--- NEW FILE: ZCanvas.java ---
package isis.nest.zaurus;

// This example is from the book _Java in a Nutshell_ by David Flanagan.
// Written by David Flanagan.  Copyright (c) 1996 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or implied.

import java.awt. *;
import java.util. *;

public class ZCanvas extends Canvas {

  public static final int LEFT = 0;	// Alignment constants

  public static final int CENTER = 1;
  public static final int RIGHT = 2;
  protected String[] lines;	// The lines of text to display

  protected int num_lines;	// The number of lines

  protected int margin_width;	// Left and right margins

  protected int margin_height;	// Top and bottom margins

  protected int line_height;	// Total height of the font

  protected int line_ascent;	// Font height above baseline

  protected int[] line_widths;	// How wide each line is

  protected int max_width;	// The width of the widest line

  protected int alignment = LEFT;	// The alignment of the text.

  // This method breaks a specified label up into an array of lines.
  // It uses the StringTokenizer utility class.
  protected void newLabel (String label)
  {
    StringTokenizer t = new StringTokenizer (label, "\n");
      num_lines = t.countTokens ();
      lines = new String[num_lines];
      line_widths = new int[num_lines];
    for (int i = 0; i < num_lines; i++)
        lines[i] = t.nextToken ();
  }

  // This method figures out how the font is, and how wide each
  // line of the label is, and how wide the widest line is.
  protected void measure ()
  {
    FontMetrics fm = this.getFontMetrics (this.getFont ());
    // If we don't have font metrics yet, just return.
    if (fm == null)
        return;

      line_height = fm.getHeight ();
      line_ascent = fm.getAscent ();
      max_width = 0;
    for (int i = 0; i < num_lines; i++)
      {
	line_widths[i] = fm.stringWidth (lines[i]);
	if (line_widths[i] > max_width)
	  max_width = line_widths[i];
      }
  }

  // Here are four versions of the cosntrutor.
  // Break the label up into separate lines, and save the other info.
  public ZCanvas (String label, int margin_width, int margin_height,
			 int alignment) {

    newLabel (label);
    this.margin_width = margin_width;
    this.margin_height = margin_height;
    this.alignment = alignment;
  }

  public ZCanvas (String label, int margin_width, int margin_height) {

    this (label, margin_width, margin_height, LEFT);
  }

  public ZCanvas (String label, int alignment) {

    this (label, 10, 10, alignment);
  }

  public ZCanvas (String label) {

    this (label, 10, 10, LEFT);
  }


  // Methods to set the various attributes of the component
  public void setLabel (String label) {

    newLabel (label);
    measure ();
    repaint ();
  }


  public void setFont (Font f) {

    super.setFont (f);
    measure ();
    repaint ();
  }


  public void setForeground (Color c)
  {
    super.setForeground (c);
    repaint ();
  }


  public void setAlignment (int a)
  {
    alignment = a;
    repaint ();
  }


  public void setMarginWidth (int mw)
  {
    margin_width = mw;
    repaint ();
  }


  public void setMarginHeight (int mh)
  {
    margin_height = mh;
    repaint ();
  }


  public int getAlignment ()
  {
    return alignment;
  }


  public int getMarginWidth ()
  {
    return margin_width;
  }


  public int getMarginHeight ()
  {
    return margin_height;
  }


  // This method is invoked after our Canvas is first created
  // but before it can actually be displayed.  After we've
  // invoked our superclass's addNotify() method, we have font
  // metrics and can successfully call measure() to figure out
  // how big the label is.
  public void addNotify () {

    super.addNotify ();
    measure ();
  }

  // This method is called by a layout manager when it wants to
  // know how big we'd like to be.  
  public Dimension getPreferredSize ()
  {
    return new Dimension (max_width + 2 * margin_width,
			  num_lines * line_height + 2 * margin_height);
  }

  // This method is called when the layout manager wants to know
  // the bare minimum amount of space we need to get by.
  public Dimension getMinimumSize ()
  {
    return new Dimension (max_width, num_lines * line_height);
  }

  // This method draws the label (applets use the same method).
  // Note that it handles the margins and the alignment, but that
  // it doesn't have to worry about the color or font--the superclass
  // takes care of setting those in the Graphics object we're passed.
  public void paint (Graphics g)
  {
    int x, y;
    Dimension d = this.getSize ();
      y = line_ascent + (d.height - num_lines * line_height) / 2;
    for (int i = 0; i < num_lines; i++, y += line_height)
      {
	switch (alignment)
	  {
	  case LEFT:
	    x = margin_width;
	    break;
	    case CENTER:
	    default:
	    x = (d.width - line_widths[i]) / 2;
	    break;
	    case RIGHT:
	    x = d.width - margin_width - line_widths[i];
	    break;
	  }
	g.drawString (lines[i], x, y);
      }
  }
}

Index: ZMain.java
===================================================================
RCS file: /cvsroot/firebug/firebug/project/zaurus/vu/isis/nest/zaurus/ZMain.java,v
retrieving revision 1.2
retrieving revision 1.3
diff -C2 -d -r1.2 -r1.3
*** ZMain.java	16 Jul 2003 15:55:43 -0000	1.2
--- ZMain.java	21 Jul 2003 15:44:03 -0000	1.3
***************
*** 42,53 ****
      Canvas canvas = new Canvas();
      canvas.setSize(cwidth,cheight);
!     Color color = new Color(1,0,0);
      canvas.setBackground(color);
  
!     panel.add(canvas);
! 
!     zf.repaint();
  
  
    }
  }
--- 42,59 ----
      Canvas canvas = new Canvas();
      canvas.setSize(cwidth,cheight);
!     Color color = new Color((float).5,(float).55,(float).5);
      canvas.setBackground(color);
  
!     //panel.add(canvas);
!     //canvas.repaint();
  
+     ZCanvas zcanvas = new ZCanvas("Foobar");
+     zcanvas.setSize(cwidth-50,cheight-50);
+     zcanvas.setBackground(color);
+     panel.add(zcanvas);
+     zcanvas.repaint();
  
    }
  }
+ 
+