Class ProgressBar 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----ProgressBar
public class ProgressBar
extends Canvas
The progress bar component is a lightweight component that can be easily incorporated into most Java programs. A progress bar is made up of a rectangle boarder, background color, a foreground color, and a percentage displayed in the center of the rectangle. The foreground color expands or contracts to fill the rectangle depending on the percentage passed in the updatebar method (for example if 50% is passed the progress bar will show the left half as the foreground color and the right half as the background color). The string percentage displayed inside the progress bar will change colors when the foreground color of the progress bar paints over it.

Constructor Index

o ProgressBar(int, int)
Creates a progress bar using the passed width and height.
o ProgressBar(int, int, Color, Color, Color)
Creates a progress bar using the passed width, height, canvas color, progress bar foreground color, and progress bar background color.

Method Index

o paint(Graphics)
Paints the progress bar on the canvas.
o setBackGroundColor(Color)
Sets the background color of the progress bar.
o setCanvasColor(Color)
Sets the background color of the canvas the progress bar is drawn on.
o setProgressColor(Color)
Sets the foreground color of the progress bar.
o update(Graphics)
o updateBar(float)
This method is called when another component wants to update the progress bar.

Constructors

o ProgressBar 
  public ProgressBar(int progressWidth,
                     int progressHeight)
Creates a progress bar using the passed width and height.

o ProgressBar 
  public ProgressBar(int progressWidth,
                     int progressHeight,
                     Color canvasColor,
                     Color progressColor,
                     Color progressBackground)
Creates a progress bar using the passed width, height, canvas color, progress bar foreground color, and progress bar background color.

Methods

o updateBar 
  public void updateBar(float percentage)
This method is called when another component wants to update the progress bar. A percentage in the form of a float between 0 and 1 is accepted, then the progress bars repaint method is called to paint the progress bar on its Canvas. The foreground of the progress bar will be repainted, plus the float will be displayed in the center of the progress bar. Never pass this method a float greater than 1.

o setCanvasColor 
  public void setCanvasColor(Color color)
Sets the background color of the canvas the progress bar is drawn on.

o setProgressColor 
  public void setProgressColor(Color progressColor)
Sets the foreground color of the progress bar.

o setBackGroundColor 
  public void setBackGroundColor(Color progressBackground)
Sets the background color of the progress bar.

o paint 
  public void paint(Graphics g)
Paints the progress bar on the canvas. The string percentage displayed inside the progress bar will change colors when the foreground color of the progress bar paints over it. This is accomplished by first painting the the string percentage in the same color as the foreground, then setting the clipping rectange to the same size as the foreground and repainting the percentage in the background color in the same spot. When the forground is not overlaying the string percentage, the second string percentage will not paint because the clipping rectangle does not cover that area.

Overrides:
paint in class Canvas
o update 
  public void update(Graphics g)
Overrides:
update in class Component
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