gainmeter.java

FMJ（freedom media for java)是java视频开发的新选择

package net.sf.fmj.ejmf.toolkit.gui.controls;


/**
* Defines methods required of a GainMeter
*/

public interface GainMeter {
    /**
      * Sets the mute status of the GainMeter.
      *
      * @param flag If true, GainMeter is muted.
      *  Otherwise gain is not muted.
      */

    public void setMute(boolean flag);

    /**
      * Set the gain value for this GainMeter. 
      *
      * @param level A gain value in GainMeter coordinates.
      */

    public void setLevel(float level);


    /** 
      * Transform a gain control level value [0.0...1.0] to
      * a value appropriate for this GainMeter.    
      *    
      * @param level A value returned by getLevel method
      *  of a GainControl object.
      * @return An integer value that represents a legal
      *  level value for this GainMeter.
      */
    public int mapToMeterLevel(float level);

	/**
	* Force redraw of the gain meter button
	*/
    public void updateView();
}