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/* Spring.java --
   Copyright (C) 2004 Free Software Foundation, Inc.
 
This file is part of GNU Classpath.
 
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
 
Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
 
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */
 
package javax.swing;
 
import java.awt.Component;
import java.awt.Dimension;
 
/**
 * Calculates the space between component edges, that are layed out by
 * {@link SpringLayout}.
 * <p>
 * A Spring defines a minimum, preferred and maximum distance for each edge
 * (north, east, south, west) of a component.
 * </p>
 * However, springs are not static, their actual values are computed at
 * runtime. That means, if a Spring C is defined as the sum of Spring A and
 * Spring B, then the values (min, pref and max) are not calculated at
 * creation of Spring C, but instead always when {@link #getValue} is
 * called. So, when Spring A or Spring B changes, this is reflected in
 * Spring C.
 *
 * @author Roman Kennke (roman@ontographics.com)
 */
public abstract class Spring
{
 
  /** Indicates a not-set value. **/
  public static final int UNSET = Integer.MIN_VALUE;
 
  /**
   * Creates a new Spring object. This constructor is used by the static
   * methods which create Springs.
   */
  protected Spring()
  {
    // Nothing to do here.
  }
 
  /**
   * Creates a Spring which min, pref and max values are all the same.
   * These kind of Springs are 'struts'.
   *
   * @param val the constant for min, pref and max values.
   * @return a Spring object with constant values for min, pref and max.
   */
  public static Spring constant(int val)
  {
    return new SimpleSpring(val, val, val);
  }
 
  /** Creates a Spring which min, pref and max values are constants.
   * @param min the constant for the minimum value.
   * @param pref the constant for the preferred value.
   * @param max the constant for the maximum value.
   * @return a Spring object with constant values for min, pref and max.
   */
  public static Spring constant(int min, int pref, int max)
  {
    return new SimpleSpring(min, pref, max);
  }
 
  /**
   * Returns the maximum value of the Spring.
   *
   * @return the maximum value.
   */
  public abstract int getMaximumValue();
 
  /**
   * Returns the minimum value of this Spring.
   *
   * @return the minimum value.
   */
  public abstract int getMinimumValue();
 
  /**
   * Return the preferred value of this Spring.
   *
   * @return the preferred value.
   */
  public abstract int getPreferredValue();
 
  /**
   * Return the actual value of this Spring.
   *
   * @return the actual value of this Spring.
   */
  public abstract int getValue();
 
  /**
   * Creates and returns a Spring, which always has the maximum values
   * min = max(min_s1, min_s2), pref = max(pref_s1, pref_s2), max =
   * max(max_s1, max_s2).
   *
   * @param s1 the first summand of the max Spring.
   * @param s2 the second summand of the max Spring.
   * @return a Spring which is max(s1, s2).
   */
  public static Spring max(Spring s1, Spring s2)
  {
    return new MaxSpring(s1, s2);
  }
 
  /**
   * Creates and returns a Spring, which is always the negation of s.
   * min = -min_s, pref = -pref_s, max = -max_pref.
   *
   * @param s the Spring to be negated.
   * @return the negative of <code>s</code>.
   */
  public static Spring minus(Spring s)
  {
    return new MinusSpring(s);
  }
 
  /**
   * Sets the actual value. If <code>value</code> is out of the (min, max)
   * bounds, then the value is adjusted, so that is inside these bounds.
   *
   * @param value the value to be set.
   */
  public abstract void setValue(int value);
 
  private int getShrinkRange()
  {
    return (getPreferredValue() - getMinimumValue());
  }
 
  private int getExpandRange()
  {
    return (getMaximumValue() - getPreferredValue());
  }
 
  double getStrain()
  {
    int v = getValue();
    int p = getPreferredValue();
    int r = (v < p) ? getShrinkRange() : getExpandRange();
    if (r == 0)
      r = 1;
    return (double)(v - p) / r;
  }
 
  void setStrain(double strain)
  {
    int r = (strain < 0) ? getShrinkRange() : getExpandRange();
    int v = (getPreferredValue() + (int)(strain * r));
    setValue(v);
  }
 
  /**
   * Creates and returns a Spring, which is always the sum of s1 and s2.
   * min_sum = min_s1 + min_s2, pref_sum = pref_s1 + pref_s2, max_sum =
   * max_s1 + max_s2.
   *
   * @param s1 the 1st summand of the sum Spring.
   * @param s2 the 2nd summand of the sum Spring.
   * @return a sum which is <code>s1 + s2</code>.
   */
  public static Spring sum(Spring s1, Spring s2)
  {
    return new AddSpring(s1, s2);
  }
 
  /**
   * Return a new Spring which computes its values by scaling
   * the values of another spring by a constant factor.  If the
   * factor is negative, the minimum and maximum values of
   * the argument spring will be interchanged.
   * @param spring the spring to track
   * @param factor the factor by which to scale
   * @return a new multiplicative Spring
   * @since 1.5
   */
  public static Spring scale(final Spring spring, final float factor)
  {
    if (spring == null)
      throw new NullPointerException("spring argument is null");
    return new Spring()
    {
      public int getMaximumValue()
      {
        return (int) ((factor < 0 ? spring.getMinimumValue()
                            : spring.getMaximumValue())
                      * factor);
      }
 
      public int getMinimumValue()
      {
        return (int) ((factor < 0 ? spring.getMaximumValue()
                                  : spring.getMinimumValue())
                            * factor);
      }
 
      public int getPreferredValue()
      {
        return (int) (spring.getPreferredValue() * factor);
      }
 
      public int getValue()
      {
        return (int) (spring.getValue() * factor);
      }
 
      public void setValue(int value)
      {
        spring.setValue((int) (value / factor));
      }
    };
  }
 
  /**
   * Return a new Spring which takes its values from the specified
   * Component.  In particular, the maximum value is taken from
   * the maximumSize, the minimum value is taken from the minimumSize,
   * the preferred value is taken from the preferredSize, and the
   * value is taken from the component's current size.  These values
   * change as the component changes size.
   * @param component the component
   * @return a new Spring which tracks the component's width
   * @since 1.5
   */
  public static Spring width(final Component component)
  {
    return new Spring()
    {
      public int getMaximumValue()
      {
        return component.getMaximumSize().width;
      }
 
      public int getMinimumValue()
      {
        return component.getMinimumSize().width;
      }
 
      public int getPreferredValue()
      {
        return component.getPreferredSize().width;
      }
 
      public int getValue()
      {
        return component.getSize().width;
      }
 
      public void setValue(int value)
      {
        Dimension d = component.getSize();
        component.setSize(value, d.height);
      }
    };
  }
 
  /**
   * Return a new Spring which takes its values from the specified
   * Component.  In particular, the maximum value is taken from
   * the maximumSize, the minimum value is taken from the minimumSize,
   * the preferred value is taken from the preferredSize, and the
   * value is taken from the component's current size.  These values
   * change as the component changes size.
   * @param component the component
   * @return a new Spring which tracks the component's height
   * @since 1.5
   */
  public static Spring height(final Component component)
  {
    return new Spring()
    {
      public int getMaximumValue()
      {
        return component.getMaximumSize().height;
      }
 
      public int getMinimumValue()
      {
        return component.getMinimumSize().height;
      }
 
      public int getPreferredValue()
      {
        return component.getPreferredSize().height;
      }
 
      public int getValue()
      {
        return component.getSize().height;
      }
 
      public void setValue(int value)
      {
        Dimension d = component.getSize();
        component.setSize(d.width, value);
      }
    };
  }
 
  /**
   * A simple Spring, that holds constant values for min, pref and max.
   *
   * @author Roman Kennke (roman@ontographics.com)
   */
  private static final class SimpleSpring extends Spring
  {
 
    /** The constant value for min. */
    private final int min;
 
    /** The constant value for pref. */
    private final int pref;
 
    /** The constant value for max. */
    private final int max;
 
    /** The actual value of the spring. */
    private int value;
 
    public String toString()
    {
      return "SimpleSpring of " + value;
    }
 
    /**
     * Creates a new SimpleSpring object.
     *
     * @param newMin the constant minimum value.
     * @param newPref the constant preferred value.
     * @param newMax the constant maximum value.
     */
    public SimpleSpring(int newMin, int newPref, int newMax)
    {
      min = newMin;
      pref = newPref;
      max = newMax;
      value = newPref;
    }
 
    /**
     * Returns the maximum value of this Spring.
     *
     * @return the maximum value.
     */
    public int getMaximumValue()
    {
      return max;
    }
 
    /**
     * Returns the minimum value of this Spring.
     *
     * @return the minimum value.
     */
    public int getMinimumValue()
    {
      return min;
    }
 
    /**
     * Returns the preferred value of this Spring.
     *
     * @return the preferred value.
     */
    public int getPreferredValue()
    {
      return pref;
    }
 
    /**
     * Return the actual current value of this Spring.
     *
     * @return the current value.
     */
    public int getValue()
    {
      if (value == Spring.UNSET)
          return pref;
      return value;
    }
 
    /**
     * Sets the current value.
     *
     * @param val the value to be set.
     */
    public void setValue(int val)
    {
      value = val;
    }
  }
 
 
  /**
   * A Spring, that is the sum of two other Springs.
   *
   * @author Roman Kennke (roman@ontographics.com)
   */
  private static final class AddSpring extends Spring
  {
 
    /** The springs, that are the 'operands' of this Spring. */
    private final Spring s1;
    private final Spring s2;
 
    /** The current value for this Spring. */
    private int value;
 
    public String toString()
    {
      return "AddSpring of " + s1 + " and " + s2;
    }
 
    /**
     * Creates a new AddSpring object.
     *
     * @param s1 the first operand.
     * @param s2 the second operand.
     */
    protected AddSpring(Spring s1, Spring s2)
    {
      super();
      this.s1 = s1;
      this.s2 = s2;
      value = Spring.UNSET;
    }
 
    /**
     * Returns the maximum value of this Spring.
     *
     * @return the maximum value.
     */
    public int getMaximumValue()
    {
      int max1 = s1.getMaximumValue();
      int max2 = s2.getMaximumValue();
      return max1 + max2;
    }
 
    /**
     * Return the minimum value of this Spring.
     *
     * @return the minimum value.
     */
    public int getMinimumValue()
    {
      int min1 = s1.getMinimumValue();
      int min2 = s2.getMinimumValue();
      return min1 + min2;
    }
 
    /**
     * Returns the preferred value of this Spring.
     *
     * @return the preferred value.
     */
    public int getPreferredValue()
    {
      int pref1 = s1.getPreferredValue();
      int pref2 = s2.getPreferredValue();
      return pref1 + pref2;
    }
 
    /**
     * Returns the actual current value of this Spring.
     *
     * @return the current value of this Spring.
     */
    public int getValue()
    {
      if (value == Spring.UNSET)
        {
          int val1 = s1.getValue();
          int val2 = s2.getValue();
          value = val1 + val2;
        }
      return value;
    }
 
    /**
     * Sets the current value.
     *
     * @param val the value to be set.
     */
    public void setValue(int val)
    {
      if (val == Spring.UNSET)
      {
        if (value != Spring.UNSET)
        {
          s1.setValue(Spring.UNSET);
          s2.setValue(Spring.UNSET);
        }
        value = Spring.UNSET;
        return;
      }
 
      value = val;
 
      //Spead the value over the two components
      double fStrain = getStrain();
      s1.setStrain(fStrain);
      int remainder = val - s1.getValue();
      s2.setValue(remainder);
    }
 
  }
 
 
  /**
   * A Spring that is calculated as the negation of another Spring.
   *
   * @author Roman Kennke (roman@ontographics.com)
   */
  private static final class MinusSpring extends Spring
  {
 
    /** The Spring from which to calculate the negation. */
    private final Spring s;
 
    public String toString()
    {
      return "MinusSpring of " + s;
    }
 
    /**
     * Creates a new MinusSpring object.
     * @param s the Spring from which to calculate the negation.
     */
    protected MinusSpring(Spring s)
    {
      super();
      this.s = s;
    }
 
    /** Returns the maximum value of this Spring.
     *
     * @return the maximum value.
     */
    public int getMaximumValue()
    {
      return -s.getMinimumValue();
    }
 
    /**
     * Returns the minimum value of this Spring.
     *
     * @return the minimum value.
     */
    public int getMinimumValue()
    {
      return -s.getMaximumValue();
    }
 
    /**
     * Returns the preferred value of this Spring.
     *
     * @return the preferred value.
     */
    public int getPreferredValue()
    {
      return -s.getPreferredValue();
    }
 
    /**
     * Returns the current value of this Spring.
     *
     * @return the current value.
     */
    public int getValue()
    {
      return -s.getValue();
    }
 
    /**
     * Sets the current value.
     *
     * @param val the value to be set.
     */
    public void setValue(int val)
    {
      if (val == Spring.UNSET)
        s.setValue(Spring.UNSET);
      else
        s.setValue(-val);
    }
  }
 
 
  /**
   * A Spring, that is calculated as the maximum of two Springs.
   *
   * @author Roman Kennke (roman@ontographics.com)
   */
  private static final class MaxSpring extends Spring
  {
 
    /** The two other Springs from which to calculate the maximum. */
    private final Spring s1;
    private final Spring s2;
 
    public String toString()
    {
      return "MaxSpring of " + s1 + " and " + s2;
    }
 
    /** The current value of this Spring. */
    private int value;
 
    /**
     * Creates a new MaxSpring object.
     *
     * @param s1 the 1st operand.
     * @param s2 the 2nd operand.
     */
    protected MaxSpring(Spring s1, Spring s2)
    {
      super();
      this.s1 = s1;
      this.s2 = s2;
      value = Spring.UNSET;
    }
 
 
    /**
     * Returns the maximum value of this Spring.
     *
     * @return the maximum value.
     */
    public int getMaximumValue()
    {
      int max1 = s1.getMaximumValue();
      int max2 = s2.getMaximumValue();
      return Math.max(max1, max2);
    }
 
    /**
     * Returns the minimum value of this Spring.
     *
     * @return the minimum value.
     */
    public int getMinimumValue()
    {
      int min1 = s1.getMinimumValue();
      int min2 = s2.getMinimumValue();
      return Math.max(min1, min2);
    }
 
    /**
     * Returns the preferred value of this Spring.
     *
     * @return the preferred value.
     */
    public int getPreferredValue()
    {
      int pref1 = s1.getPreferredValue();
      int pref2 = s2.getPreferredValue();
      return Math.max(pref1, pref2);
    }
 
    /**
     * Returns the actual value of this Spring.
     *
     * @return the current value.
     */
    public int getValue()
    {
      if (value == Spring.UNSET)
      {
          int val1 = s1.getValue();
          int val2 = s2.getValue();
          value = Math.max(val1, val2);
      }
      return value;
    }
 
    /**
     * Sets the current value.
     *
     * @param val the value to be set.
     */
    public void setValue(int val)
    {
      if (val == Spring.UNSET)
      {
        if (value != Spring.UNSET)
        {
          s1.setValue(Spring.UNSET);
          s2.setValue(Spring.UNSET);
        }
        value = Spring.UNSET;
        return;
      }
 
      value = val;
 
      int p1 = s1.getPreferredValue();
      int p2 = s2.getPreferredValue();
 
      if (p1 < p2)
      {
        s1.setValue(Math.min(val, p1));
        s2.setValue(val);
      }
      else
      {
        s1.setValue(val);
        s2.setValue(Math.min(val, p2));
      }
    }
  }
}

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Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [javax/] [swing/] [Spring.java] - Blame information for rev 772

Line No.	Rev	Author	Line
1	772	jeremybenn	`/* Spring.java --`
2			`Copyright (C) 2004 Free Software Foundation, Inc.`
3
4			`This file is part of GNU Classpath.`
5
6			`GNU Classpath is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License as published by`
8			`the Free Software Foundation; either version 2, or (at your option)`
9			`any later version.`
10
11			`GNU Classpath is distributed in the hope that it will be useful, but`
12			`WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
14			`General Public License for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with GNU Classpath; see the file COPYING. If not, write to the`
18			`Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA`
19			`02110-1301 USA.`
20
21			`Linking this library statically or dynamically with other modules is`
22			`making a combined work based on this library. Thus, the terms and`
23			`conditions of the GNU General Public License cover the whole`
24			`combination.`
25
26			`As a special exception, the copyright holders of this library give you`
27			`permission to link this library with independent modules to produce an`
28			`executable, regardless of the license terms of these independent`
29			`modules, and to copy and distribute the resulting executable under`
30			`terms of your choice, provided that you also meet, for each linked`
31			`independent module, the terms and conditions of the license of that`
32			`module. An independent module is a module which is not derived from`
33			`or based on this library. If you modify this library, you may extend`
34			`this exception to your version of the library, but you are not`
35			`obligated to do so. If you do not wish to do so, delete this`
36			`exception statement from your version. */`
37
38			`package javax.swing;`
39
40			`import java.awt.Component;`
41			`import java.awt.Dimension;`
42
43			`/**`
44			`* Calculates the space between component edges, that are layed out by`
45			`* {@link SpringLayout}.`
46			`* <p>`
47			`* A Spring defines a minimum, preferred and maximum distance for each edge`
48			`* (north, east, south, west) of a component.`
49			`* </p>`
50			`* However, springs are not static, their actual values are computed at`
51			`* runtime. That means, if a Spring C is defined as the sum of Spring A and`
52			`* Spring B, then the values (min, pref and max) are not calculated at`
53			`* creation of Spring C, but instead always when {@link #getValue} is`
54			`* called. So, when Spring A or Spring B changes, this is reflected in`
55			`* Spring C.`
56			`*`
57			`* @author Roman Kennke (roman@ontographics.com)`
58			`*/`
59			`public abstract class Spring`
60			`{`
61
62			`/ Indicates a not-set value. /`
63			`public static final int UNSET = Integer.MIN_VALUE;`
64
65			`/**`
66			`* Creates a new Spring object. This constructor is used by the static`
67			`* methods which create Springs.`
68			`*/`
69			`protected Spring()`
70			`{`
71			`// Nothing to do here.`
72			`}`
73
74			`/**`
75			`* Creates a Spring which min, pref and max values are all the same.`
76			`* These kind of Springs are 'struts'.`
77			`*`
78			`* @param val the constant for min, pref and max values.`
79			`* @return a Spring object with constant values for min, pref and max.`
80			`*/`
81			`public static Spring constant(int val)`
82			`{`
83			`return new SimpleSpring(val, val, val);`
84			`}`
85
86			`/** Creates a Spring which min, pref and max values are constants.`
87			`* @param min the constant for the minimum value.`
88			`* @param pref the constant for the preferred value.`
89			`* @param max the constant for the maximum value.`
90			`* @return a Spring object with constant values for min, pref and max.`
91			`*/`
92			`public static Spring constant(int min, int pref, int max)`
93			`{`
94			`return new SimpleSpring(min, pref, max);`
95			`}`
96
97			`/**`
98			`* Returns the maximum value of the Spring.`
99			`*`
100			`* @return the maximum value.`
101			`*/`
102			`public abstract int getMaximumValue();`
103
104			`/**`
105			`* Returns the minimum value of this Spring.`
106			`*`
107			`* @return the minimum value.`
108			`*/`
109			`public abstract int getMinimumValue();`
110
111			`/**`
112			`* Return the preferred value of this Spring.`
113			`*`
114			`* @return the preferred value.`
115			`*/`
116			`public abstract int getPreferredValue();`
117
118			`/**`
119			`* Return the actual value of this Spring.`
120			`*`
121			`* @return the actual value of this Spring.`
122			`*/`
123			`public abstract int getValue();`
124
125			`/**`
126			`* Creates and returns a Spring, which always has the maximum values`
127			`* min = max(min_s1, min_s2), pref = max(pref_s1, pref_s2), max =`
128			`* max(max_s1, max_s2).`
129			`*`
130			`* @param s1 the first summand of the max Spring.`
131			`* @param s2 the second summand of the max Spring.`
132			`* @return a Spring which is max(s1, s2).`
133			`*/`
134			`public static Spring max(Spring s1, Spring s2)`
135			`{`
136			`return new MaxSpring(s1, s2);`
137			`}`
138
139			`/**`
140			`* Creates and returns a Spring, which is always the negation of s.`
141			`* min = -min_s, pref = -pref_s, max = -max_pref.`
142			`*`
143			`* @param s the Spring to be negated.`
144			`* @return the negative of <code>s</code>.`
145			`*/`
146			`public static Spring minus(Spring s)`
147			`{`
148			`return new MinusSpring(s);`
149			`}`
150
151			`/**`
152			`* Sets the actual value. If <code>value</code> is out of the (min, max)`
153			`* bounds, then the value is adjusted, so that is inside these bounds.`
154			`*`
155			`* @param value the value to be set.`
156			`*/`
157			`public abstract void setValue(int value);`
158
159			`private int getShrinkRange()`
160			`{`
161			`return (getPreferredValue() - getMinimumValue());`
162			`}`
163
164			`private int getExpandRange()`
165			`{`
166			`return (getMaximumValue() - getPreferredValue());`
167			`}`
168
169			`double getStrain()`
170			`{`
171			`int v = getValue();`
172			`int p = getPreferredValue();`
173			`int r = (v < p) ? getShrinkRange() : getExpandRange();`
174			`if (r == 0)`
175			`r = 1;`
176			`return (double)(v - p) / r;`
177			`}`
178
179			`void setStrain(double strain)`
180			`{`
181			`int r = (strain < 0) ? getShrinkRange() : getExpandRange();`
182			`int v = (getPreferredValue() + (int)(strain * r));`
183			`setValue(v);`
184			`}`
185
186			`/**`
187			`* Creates and returns a Spring, which is always the sum of s1 and s2.`
188			`* min_sum = min_s1 + min_s2, pref_sum = pref_s1 + pref_s2, max_sum =`
189			`* max_s1 + max_s2.`
190			`*`
191			`* @param s1 the 1st summand of the sum Spring.`
192			`* @param s2 the 2nd summand of the sum Spring.`
193			`* @return a sum which is <code>s1 + s2</code>.`
194			`*/`
195			`public static Spring sum(Spring s1, Spring s2)`
196			`{`
197			`return new AddSpring(s1, s2);`
198			`}`
199
200			`/**`
201			`* Return a new Spring which computes its values by scaling`
202			`* the values of another spring by a constant factor. If the`
203			`* factor is negative, the minimum and maximum values of`
204			`* the argument spring will be interchanged.`
205			`* @param spring the spring to track`
206			`* @param factor the factor by which to scale`
207			`* @return a new multiplicative Spring`
208			`* @since 1.5`
209			`*/`
210			`public static Spring scale(final Spring spring, final float factor)`
211			`{`
212			`if (spring == null)`
213			`throw new NullPointerException("spring argument is null");`
214			`return new Spring()`
215			`{`
216			`public int getMaximumValue()`
217			`{`
218			`return (int) ((factor < 0 ? spring.getMinimumValue()`
219			`: spring.getMaximumValue())`
220			`* factor);`
221			`}`
222
223			`public int getMinimumValue()`
224			`{`
225			`return (int) ((factor < 0 ? spring.getMaximumValue()`
226			`: spring.getMinimumValue())`
227			`* factor);`
228			`}`
229
230			`public int getPreferredValue()`
231			`{`
232			`return (int) (spring.getPreferredValue() * factor);`
233			`}`
234
235			`public int getValue()`
236			`{`
237			`return (int) (spring.getValue() * factor);`
238			`}`
239
240			`public void setValue(int value)`
241			`{`
242			`spring.setValue((int) (value / factor));`
243			`}`
244			`};`
245			`}`
246
247			`/**`
248			`* Return a new Spring which takes its values from the specified`
249			`* Component. In particular, the maximum value is taken from`
250			`* the maximumSize, the minimum value is taken from the minimumSize,`
251			`* the preferred value is taken from the preferredSize, and the`
252			`* value is taken from the component's current size. These values`
253			`* change as the component changes size.`
254			`* @param component the component`
255			`* @return a new Spring which tracks the component's width`
256			`* @since 1.5`
257			`*/`
258			`public static Spring width(final Component component)`
259			`{`
260			`return new Spring()`
261			`{`
262			`public int getMaximumValue()`
263			`{`
264			`return component.getMaximumSize().width;`
265			`}`
266
267			`public int getMinimumValue()`
268			`{`
269			`return component.getMinimumSize().width;`
270			`}`
271
272			`public int getPreferredValue()`
273			`{`
274			`return component.getPreferredSize().width;`
275			`}`
276
277			`public int getValue()`
278			`{`
279			`return component.getSize().width;`
280			`}`
281
282			`public void setValue(int value)`
283			`{`
284			`Dimension d = component.getSize();`
285			`component.setSize(value, d.height);`
286			`}`
287			`};`
288			`}`
289
290			`/**`
291			`* Return a new Spring which takes its values from the specified`
292			`* Component. In particular, the maximum value is taken from`
293			`* the maximumSize, the minimum value is taken from the minimumSize,`
294			`* the preferred value is taken from the preferredSize, and the`
295			`* value is taken from the component's current size. These values`
296			`* change as the component changes size.`
297			`* @param component the component`
298			`* @return a new Spring which tracks the component's height`
299			`* @since 1.5`
300			`*/`
301			`public static Spring height(final Component component)`
302			`{`
303			`return new Spring()`
304			`{`
305			`public int getMaximumValue()`
306			`{`
307			`return component.getMaximumSize().height;`
308			`}`
309
310			`public int getMinimumValue()`
311			`{`
312			`return component.getMinimumSize().height;`
313			`}`
314
315			`public int getPreferredValue()`
316			`{`
317			`return component.getPreferredSize().height;`
318			`}`
319
320			`public int getValue()`
321			`{`
322			`return component.getSize().height;`
323			`}`
324
325			`public void setValue(int value)`
326			`{`
327			`Dimension d = component.getSize();`
328			`component.setSize(d.width, value);`
329			`}`
330			`};`
331			`}`
332
333			`/**`
334			`* A simple Spring, that holds constant values for min, pref and max.`
335			`*`
336			`* @author Roman Kennke (roman@ontographics.com)`
337			`*/`
338			`private static final class SimpleSpring extends Spring`
339			`{`
340
341			`/** The constant value for min. */`
342			`private final int min;`
343
344			`/** The constant value for pref. */`
345			`private final int pref;`
346
347			`/** The constant value for max. */`
348			`private final int max;`
349
350			`/** The actual value of the spring. */`
351			`private int value;`
352
353			`public String toString()`
354			`{`
355			`return "SimpleSpring of " + value;`
356			`}`
357
358			`/**`
359			`* Creates a new SimpleSpring object.`
360			`*`
361			`* @param newMin the constant minimum value.`
362			`* @param newPref the constant preferred value.`
363			`* @param newMax the constant maximum value.`
364			`*/`
365			`public SimpleSpring(int newMin, int newPref, int newMax)`
366			`{`
367			`min = newMin;`
368			`pref = newPref;`
369			`max = newMax;`
370			`value = newPref;`
371			`}`
372
373			`/**`
374			`* Returns the maximum value of this Spring.`
375			`*`
376			`* @return the maximum value.`
377			`*/`
378			`public int getMaximumValue()`
379			`{`
380			`return max;`
381			`}`
382
383			`/**`
384			`* Returns the minimum value of this Spring.`
385			`*`
386			`* @return the minimum value.`
387			`*/`
388			`public int getMinimumValue()`
389			`{`
390			`return min;`
391			`}`
392
393			`/**`
394			`* Returns the preferred value of this Spring.`
395			`*`
396			`* @return the preferred value.`
397			`*/`
398			`public int getPreferredValue()`
399			`{`
400			`return pref;`
401			`}`
402
403			`/**`
404			`* Return the actual current value of this Spring.`
405			`*`
406			`* @return the current value.`
407			`*/`
408			`public int getValue()`
409			`{`
410			`if (value == Spring.UNSET)`
411			`return pref;`
412			`return value;`
413			`}`
414
415			`/**`
416			`* Sets the current value.`
417			`*`
418			`* @param val the value to be set.`
419			`*/`
420			`public void setValue(int val)`
421			`{`
422			`value = val;`
423			`}`
424			`}`
425
426
427			`/**`
428			`* A Spring, that is the sum of two other Springs.`
429			`*`
430			`* @author Roman Kennke (roman@ontographics.com)`
431			`*/`
432			`private static final class AddSpring extends Spring`
433			`{`
434
435			`/** The springs, that are the 'operands' of this Spring. */`
436			`private final Spring s1;`
437			`private final Spring s2;`
438
439			`/** The current value for this Spring. */`
440			`private int value;`
441
442			`public String toString()`
443			`{`
444			`return "AddSpring of " + s1 + " and " + s2;`
445			`}`
446
447			`/**`
448			`* Creates a new AddSpring object.`
449			`*`
450			`* @param s1 the first operand.`
451			`* @param s2 the second operand.`
452			`*/`
453			`protected AddSpring(Spring s1, Spring s2)`
454			`{`
455			`super();`
456			`this.s1 = s1;`
457			`this.s2 = s2;`
458			`value = Spring.UNSET;`
459			`}`
460
461			`/**`
462			`* Returns the maximum value of this Spring.`
463			`*`
464			`* @return the maximum value.`
465			`*/`
466			`public int getMaximumValue()`
467			`{`
468			`int max1 = s1.getMaximumValue();`
469			`int max2 = s2.getMaximumValue();`
470			`return max1 + max2;`
471			`}`
472
473			`/**`
474			`* Return the minimum value of this Spring.`
475			`*`
476			`* @return the minimum value.`
477			`*/`
478			`public int getMinimumValue()`
479			`{`
480			`int min1 = s1.getMinimumValue();`
481			`int min2 = s2.getMinimumValue();`
482			`return min1 + min2;`
483			`}`
484
485			`/**`
486			`* Returns the preferred value of this Spring.`
487			`*`
488			`* @return the preferred value.`
489			`*/`
490			`public int getPreferredValue()`
491			`{`
492			`int pref1 = s1.getPreferredValue();`
493			`int pref2 = s2.getPreferredValue();`
494			`return pref1 + pref2;`
495			`}`
496
497			`/**`
498			`* Returns the actual current value of this Spring.`
499			`*`
500			`* @return the current value of this Spring.`
501			`*/`
502			`public int getValue()`
503			`{`
504			`if (value == Spring.UNSET)`
505			`{`
506			`int val1 = s1.getValue();`
507			`int val2 = s2.getValue();`
508			`value = val1 + val2;`
509			`}`
510			`return value;`
511			`}`
512
513			`/**`
514			`* Sets the current value.`
515			`*`
516			`* @param val the value to be set.`
517			`*/`
518			`public void setValue(int val)`
519			`{`
520			`if (val == Spring.UNSET)`
521			`{`
522			`if (value != Spring.UNSET)`
523			`{`
524			`s1.setValue(Spring.UNSET);`
525			`s2.setValue(Spring.UNSET);`
526			`}`
527			`value = Spring.UNSET;`
528			`return;`
529			`}`
530
531			`value = val;`
532
533			`//Spead the value over the two components`
534			`double fStrain = getStrain();`
535			`s1.setStrain(fStrain);`
536			`int remainder = val - s1.getValue();`
537			`s2.setValue(remainder);`
538			`}`
539
540			`}`
541
542
543			`/**`
544			`* A Spring that is calculated as the negation of another Spring.`
545			`*`
546			`* @author Roman Kennke (roman@ontographics.com)`
547			`*/`
548			`private static final class MinusSpring extends Spring`
549			`{`
550
551			`/** The Spring from which to calculate the negation. */`
552			`private final Spring s;`
553
554			`public String toString()`
555			`{`
556			`return "MinusSpring of " + s;`
557			`}`
558
559			`/**`
560			`* Creates a new MinusSpring object.`
561			`* @param s the Spring from which to calculate the negation.`
562			`*/`
563			`protected MinusSpring(Spring s)`
564			`{`
565			`super();`
566			`this.s = s;`
567			`}`
568
569			`/** Returns the maximum value of this Spring.`
570			`*`
571			`* @return the maximum value.`
572			`*/`
573			`public int getMaximumValue()`
574			`{`
575			`return -s.getMinimumValue();`
576			`}`
577
578			`/**`
579			`* Returns the minimum value of this Spring.`
580			`*`
581			`* @return the minimum value.`
582			`*/`
583			`public int getMinimumValue()`
584			`{`
585			`return -s.getMaximumValue();`
586			`}`
587
588			`/**`
589			`* Returns the preferred value of this Spring.`
590			`*`
591			`* @return the preferred value.`
592			`*/`
593			`public int getPreferredValue()`
594			`{`
595			`return -s.getPreferredValue();`
596			`}`
597
598			`/**`
599			`* Returns the current value of this Spring.`
600			`*`
601			`* @return the current value.`
602			`*/`
603			`public int getValue()`
604			`{`
605			`return -s.getValue();`
606			`}`
607
608			`/**`
609			`* Sets the current value.`
610			`*`
611			`* @param val the value to be set.`
612			`*/`
613			`public void setValue(int val)`
614			`{`
615			`if (val == Spring.UNSET)`
616			`s.setValue(Spring.UNSET);`
617			`else`
618			`s.setValue(-val);`
619			`}`
620			`}`
621
622
623			`/**`
624			`* A Spring, that is calculated as the maximum of two Springs.`
625			`*`
626			`* @author Roman Kennke (roman@ontographics.com)`
627			`*/`
628			`private static final class MaxSpring extends Spring`
629			`{`
630
631			`/** The two other Springs from which to calculate the maximum. */`
632			`private final Spring s1;`
633			`private final Spring s2;`
634
635			`public String toString()`
636			`{`
637			`return "MaxSpring of " + s1 + " and " + s2;`
638			`}`
639
640			`/** The current value of this Spring. */`
641			`private int value;`
642
643			`/**`
644			`* Creates a new MaxSpring object.`
645			`*`
646			`* @param s1 the 1st operand.`
647			`* @param s2 the 2nd operand.`
648			`*/`
649			`protected MaxSpring(Spring s1, Spring s2)`
650			`{`
651			`super();`
652			`this.s1 = s1;`
653			`this.s2 = s2;`
654			`value = Spring.UNSET;`
655			`}`
656
657
658			`/**`
659			`* Returns the maximum value of this Spring.`
660			`*`
661			`* @return the maximum value.`
662			`*/`
663			`public int getMaximumValue()`
664			`{`
665			`int max1 = s1.getMaximumValue();`
666			`int max2 = s2.getMaximumValue();`
667			`return Math.max(max1, max2);`
668			`}`
669
670			`/**`
671			`* Returns the minimum value of this Spring.`
672			`*`
673			`* @return the minimum value.`
674			`*/`
675			`public int getMinimumValue()`
676			`{`
677			`int min1 = s1.getMinimumValue();`
678			`int min2 = s2.getMinimumValue();`
679			`return Math.max(min1, min2);`
680			`}`
681
682			`/**`
683			`* Returns the preferred value of this Spring.`
684			`*`
685			`* @return the preferred value.`
686			`*/`
687			`public int getPreferredValue()`
688			`{`
689			`int pref1 = s1.getPreferredValue();`
690			`int pref2 = s2.getPreferredValue();`
691			`return Math.max(pref1, pref2);`
692			`}`
693
694			`/**`
695			`* Returns the actual value of this Spring.`
696			`*`
697			`* @return the current value.`
698			`*/`
699			`public int getValue()`
700			`{`
701			`if (value == Spring.UNSET)`
702			`{`
703			`int val1 = s1.getValue();`
704			`int val2 = s2.getValue();`
705			`value = Math.max(val1, val2);`
706			`}`
707			`return value;`
708			`}`
709
710			`/**`
711			`* Sets the current value.`
712			`*`
713			`* @param val the value to be set.`
714			`*/`
715			`public void setValue(int val)`
716			`{`
717			`if (val == Spring.UNSET)`
718			`{`
719			`if (value != Spring.UNSET)`
720			`{`
721			`s1.setValue(Spring.UNSET);`
722			`s2.setValue(Spring.UNSET);`
723			`}`
724			`value = Spring.UNSET;`
725			`return;`
726			`}`
727
728			`value = val;`
729
730			`int p1 = s1.getPreferredValue();`
731			`int p2 = s2.getPreferredValue();`
732
733			`if (p1 < p2)`
734			`{`
735			`s1.setValue(Math.min(val, p1));`
736			`s2.setValue(val);`
737			`}`
738			`else`
739			`{`
740			`s1.setValue(val);`
741			`s2.setValue(Math.min(val, p2));`
742			`}`
743			`}`
744			`}`
745			`}`