gcc/libjava/java/awt/Adjustable.java

/* Adjustable.java -- Objects with a numeric adjustment scale
   Copyright (C) 1999, 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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02111-1307 USA.

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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package java.awt;

import java.awt.event.AdjustmentListener;

/**
 * This interface is for objects that take a numeric value that can be
 * adjusted within a bounded range.  For example, a scroll bar.
 *
 * @author Aaron M. Renn <arenn@urbanophile.com>
 * @since 1.0
 * @status updated to 1.4
 */
public interface Adjustable
{
  /** Constant for an adjustable object with horizontal orientation. */
  int HORIZONTAL = 0;

  /** Constant for an adjustable object with vertical orientation. */
  int VERTICAL = 1;

  /** Constant for an adjustable object with no orientation. */
  int NO_ORIENTATION = 2;

  /**
   * Returns a constant representing the orientation of the object.
   *
   * @return the orientation of this object
   * @see #HORIZONTAL
   * @see #VERTICAL
   * @see #NO_ORIENTATION
   */
  int getOrientation();

  /**
   * Sets the minimum value this object can have.
   *
   * @param minimum the new minimum value
   */
  void setMinimum(int minimum);

  /**
   * Returns the minimum value this object can have.
   *
   * @return the minimum value
   */
  int getMinimum();

  /**
   * Sets the maximum value this object can have.
   *
   * @param maximum the new maximum value
   */
  void setMaximum(int maximum);

  /**
   * Returns the maximum value this object can have.
   *
   * @return the maximum value
   */
  int getMaximum();

  /**
   * Sets the increment value for incrementing the value by units.
   *
   * @param increment the unit increment value
   */
  void setUnitIncrement(int increment);

  /**
   * Returns the increment value for incrementing the value by units.
   *
   * @return the unit increment value
   */
  int getUnitIncrement();

  /**
   * Sets the increment value for incrementing the value by blocks.
   *
   * @param increment the block increment value
   */
  void setBlockIncrement(int increment);

  /**
   * Returns the increment value for incrementing the value by blocks.
   *
   * @return the block increment value
   */
  int getBlockIncrement();

  /**
   * Sets the length of the indicator for this object to the specified value.
   *
   * @param length the indicator length
   */
  void setVisibleAmount(int length);

  /**
   * Returns the length of the indicator for this object.
   *
   * @return the indicator length
   */
  int getVisibleAmount();

  /**
   * Sets the current value of the object.
   *
   * @param value the new value
   */
  void setValue(int value);

  /**
   * Returns the current value of the object.
   *
   * @return the current value
   */
  int getValue();

  /**
   * Adds a listener that will receive adjustment events for this object.
   *
   * @param listener the adjustment listener to add
   * @see java.awt.event.AdjustmentEvent
   */
  void addAdjustmentListener(AdjustmentListener listener);

  /**
   * Removes an adjustment listener from this object.
   *
   * @param listener the adjustment listener to remove
   * @see java.awt.event.AdjustmentEvent
   */
  void removeAdjustmentListener(AdjustmentListener listener);
} // interface Adjustable