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Hi list, now that my copyright assignment for GNU Classpath is done, I'd like to send my SpringLayout implementation again. Please review it carefully, comment on it and include it into the java-gui-branch if you think it's good. I have tested it carefully, it works quite good (at least with the SpringLayout examples from the Java tutorial). I also have some Mauve testcases lying around somewhere, which I will try to get in soon. The other option would be to grant CVS access to me, so I can do this myself :) This would not be too bad, I intend to implement some more. Best wishes, Roman
/* 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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;
/**
* 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 #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 = -2147483648;
/**
* Creates a new Spring object. This constructor is used by the static
* methods which create Springs.
*/
protected Spring()
{
}
/**
* 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);
/**
* 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);
}
//============================================
// Inner classes
//============================================
/**
* 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;
/**
* Creates a new SimpleSpring object.
*
* @param min the constant minimum value.
* @param pref the constant preferred value.
* @param max the constant maximum value.
*/
public SimpleSpring(int newMin, int newPref, int newMax)
{
min = newMin;
pref = newPref;
max = newMax;
value = Spring.UNSET;
}
/**
* 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)
{
value = pref;
}
return value;
}
/**
* Sets the current value.
*
* @param val the value to be set.
*/
public void setValue(int val)
{
if (val > max)
{
value = max;
}
else if (val < min)
{
value = min;
}
else
{
value = val;
}
}
} // End of SimpleSpring
/**
* 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;
/**
* 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 > getMaximumValue())
{
value = getMaximumValue();
}
else if (val < getMinimumValue())
{
value = getMinimumValue();
}
else
{
value = val;
}
}
} // End of AddSpring
/**
* 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;
/** The current value of this Spring. */
private int value;
/**
* Creates a new MinusSpring object.
* @param s the Spring from which to calculate the negation.
*/
protected MinusSpring(Spring s)
{
super();
this.s = s;
value = Spring.UNSET;
}
/** 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()
{
if (value == Spring.UNSET)
{
value = -s.getValue();
}
return value;
}
/**
* Sets the current value.
*
* @param val the value to be set.
*/
public void setValue(int val)
{
if (val > getMaximumValue())
{
value = getMaximumValue();
}
else if (val < getMinimumValue())
{
value = getMinimumValue();
}
else
{
value = val;
}
}
} // End of MinuxSpring
/**
* 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;
/** 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 > getMaximumValue())
{
value = getMaximumValue();
}
else if (val < getMinimumValue())
{
value = getMinimumValue();
}
else
{
value = val;
}
}
} // End of MaxSpring
} // End of Spring
/* SpringLayout.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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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.Container;
import java.awt.Dimension;
import java.awt.LayoutManager2;
import java.util.HashMap;
import java.util.Map;
import javax.swing.Spring;
/**
* A very flexible layout manager. Components are layed out by defining the
* relationships between them. The relationships are expressed as
* {@link Spring}s. You can attach a Spring for each edge of a component and
* link it to an edge of a different component. For example, you can say,
* the northern edge of component A should be attached to the southern edge
* of component B, and the space between them should be something between
* x and y pixels, and preferably z pixels.
* <p>While quite simple, this layout manager can be used to emulate most other
* layout managers, and can also be used to solve some layout problems, which
* would be hard to solve with other layout managers.</p>
*
* @author Roman Kennke (roman@ontographics.com)
*/
public class SpringLayout implements LayoutManager2
{
/** The right edge of a component. */
public static final String EAST = "East";
/** The top edge of a component. */
public static final String NORTH = "North";
/** The bottom edge of a component. */
public static final String SOUTH = "South";
/** The left edge of a component. */
public static final String WEST = "West";
/** maps components to their constraints. */
private Map constraintsMap;
/**
* The constraints that define the relationships between components.
* Each Constraints object can hold 4 Springs: one for each edge of the
* component. Additionally it can hold Springs for the components width
* and the components height. Since the height and width constraints are
* dependend on the other constraints, a component can be over-constraint.
* In this case (like when all of NORTH, SOUTH and HEIGHT are constraint),
* the values are adjusted, so that the mathematics still hold true.
*
* @author Roman Kennke (roman@ontographics.com)
*/
public final static class Constraints
{
// The constraints for each edge, and width and height.
/** The Spring for the left edge. */
private Spring x;
/** The Spring for the upper edge. */
private Spring y;
/** The Spring for the height. */
private Spring height;
/** The Spring for the width. */
private Spring width;
/** The Spring for the right edge. */
private Spring east;
/** The Spring for the bottom edge. */
private Spring south;
/**
* Creates a new Constraints object.
* There is no constraint set.
*/
public Constraints()
{
x = y = height = width = east = south = null;
}
/**
* Creates a new Constraints object.
*
* @param x the constraint for the left edge of the component.
* @param y the constraint for the upper edge of the component.
*/
public Constraints(Spring x, Spring y)
{
this.x = x;
this.y = y;
width = height = east = south = null;
}
/**
* Creates a new Constraints object.
*
* @param x the constraint for the left edge of the component.
* @param y the constraint for the upper edge of the component.
* @param width the constraint for the width of the component.
* @param height the constraint for the height of the component.
*/
public Constraints(Spring x, Spring y, Spring width, Spring height)
{
this.x = x;
this.y = y;
this.width = width;
this.height = height;
east = south = null;
}
/**
* Returns the constraint for the edge with the <code>edgeName</code>.
* This is expected to be one of
* {@link #EAST}, {@link #WEST}, {@link NORTH} or {@link SOUTH}.
*
* @param edgeName the name of the edge.
* @return the constraint for the specified edge.
*/
public Spring getConstraint(String edgeName)
{
Spring retVal = null;
if (edgeName.equals(SpringLayout.NORTH))
retVal = y;
else if (edgeName.equals(SpringLayout.WEST))
retVal = x;
else if (edgeName.equals(SpringLayout.SOUTH))
{
retVal = south;
if ((retVal == null) && (y != null) && (height != null))
retVal = Spring.sum(y, height);
}
else if (edgeName.equals(SpringLayout.EAST))
{
retVal = east;
if ((retVal == null) && (x != null) && (width != null))
retVal = Spring.sum(x, width);
}
return retVal;
}
/**
* Returns the constraint for the height of the component.
*
* @return the height constraint.
*/
public Spring getHeight()
{
Spring retVal = height;
if ((retVal == null) && (y != null) && (south != null))
{
retVal = Spring.sum(south, Spring.minus(y));
}
return retVal;
}
/**
* Returns the constraint for the width of the component.
*
* @return the width constraint.
*/
public Spring getWidth()
{
Spring retVal = width;
if ((retVal == null) && (x != null) && (east != null))
{
retVal = Spring.sum(east, Spring.minus(x));
}
return retVal;
}
/**
* Returns the constraint for the left edge of the component.
*
* @return the left-edge constraint (== WEST).
*/
public Spring getX()
{
Spring retVal = x;
if ((retVal == null) && (width != null) && (east != null))
{
retVal = Spring.sum(east, Spring.minus(width));
}
return retVal;
}
/**
* Returns the constraint for the upper edge of the component.
*
* @return the upper-edge constraint (== NORTH).
*/
public Spring getY()
{
Spring retVal = y;
if ((retVal == null) && (height != null) && (south != null))
{
retVal = Spring.sum(south, Spring.minus(height));
}
return retVal;
}
/**
* Sets a constraint for the specified edge. If this leads to an
* over-constrained situation, the constraints get adjusted, so that
* the mathematics still hold true.
* @param edgeName the name of the edge, one of {@link #EAST},
* {@link #WEST}, {@link NORTH} or {@link SOUTH}.
* @param s the constraint to be set.
*/
public void setConstraint(String edgeName, Spring s)
{
if (edgeName.equals(SpringLayout.WEST))
{
x = s;
if ((width != null) && (east != null))
width = Spring.sum(east, Spring.minus(x));
}
else if (edgeName.equals(SpringLayout.NORTH))
{
y = s;
if ((height != null) && (south != null))
height = Spring.sum(south, Spring.minus(y));
}
else if (edgeName.equals(SpringLayout.EAST))
{
east = s;
if ((x != null) && (width != null))
x = Spring.sum(east, Spring.minus(width));
}
else if (edgeName.equals(SpringLayout.SOUTH))
{
south = s;
if ((height != null) && (y != null))
y = Spring.sum(south, Spring.minus(height));
}
}
/**
* Sets the height-constraint.
*
* @param s the constraint to be set.
*/
public void setHeight(Spring s)
{
height = s;
if ((south != null) && (y != null))
south = Spring.sum(y, height);
}
/**
* Sets the width-constraint.
*
* @param s the constraint to be set.
*/
public void setWidth(Spring s)
{
width = s;
if ((east != null) && (x != null))
east = Spring.sum(x, width);
}
/**
* Sets the WEST-constraint.
*
* @param s the constraint to be set.
*/
public void setX(Spring s)
{
x = s;
if ((width != null) && (east != null))
width = Spring.sum(east, Spring.minus(x));
}
/**
* Sets the NORTH-constraint.
*
* @param s the constraint to be set.
*/
public void setY(Spring s)
{
y = s;
if ((height != null) && (south != null))
height = Spring.sum(south, Spring.minus(y));
}
}
/**
* Creates a new SpringLayout.
*/
public SpringLayout()
{
constraintsMap = new HashMap();
}
/**
* Adds a layout component and a constraint object to this layout.
* This method is usually only called by a {@java.awt.Container}s add
* Method.
*
* @param component the component to be added.
* @param constraint the constraint to be set.
*/
public void addLayoutComponent(Component component, Object constraint)
{
constraintsMap.put(component, constraint);
}
/**
* Adds a layout component and a constraint object to this layout.
* This method is usually only called by a {@java.awt.Container}s add
* Method. This method does nothing, since SpringLayout does not manage
* String-indexed components.
*
* @param component the component to be added.
* @param constraint the constraint to be set.
*/
public void addLayoutComponent(String name, Component c)
{
// do nothing here.
}
/**
* Returns the constraint of the edge named by <code>edgeName</code>.
*
* @param c the component from which to get the constraint.
* @param edgeName the name of the edge, one of {@link #EAST},
* {@link #WEST}, {@link NORTH} or {@link SOUTH}.
* @return the constraint of the edge <code>edgeName</code> of the
* component c.
*/
public Spring getConstraint(String edgeName, Component c)
{
Constraints constraints = getConstraints(c);
return constraints.getConstraint(edgeName);
}
/**
* Returns the {@link Constraints} object associated with the specified
* component.
*
* @param c the component for which to determine the constraint.
* @return the {@link Constraints} object associated with the specified
* component.
*/
public SpringLayout.Constraints getConstraints(Component c)
{
Constraints constraints = (Constraints) constraintsMap.get(c);
if (constraints == null)
{
Container parent = c.getParent();
constraints = new Constraints();
if (parent != null)
{
constraints.setX
(Spring.constant(parent.getInsets().left));
constraints.setY
(Spring.constant(parent.getInsets().top));
}
else
{
constraints.setX
(Spring.constant(0));
constraints.setY
(Spring.constant(0));
}
constraints.setWidth
(Spring.constant(c.getMinimumSize().width,
c.getPreferredSize().width,
c.getMaximumSize().width));
constraints.setHeight
(Spring.constant(c.getMinimumSize().height,
c.getPreferredSize().height,
c.getMaximumSize().height));
constraintsMap.put(c, constraints);
}
return constraints;
}
/**
* Returns the X alignment of the Container <code>p</code>.
*
* @param p the {@link java.awt.Container} for which to determine the X
* alignment.
* @return always 0.0
*/
public float getLayoutAlignmentX(Container p)
{
return 0.0F;
}
/**
* Returns the Y alignment of the Container <code>p</code>.
*
* @param p the {@link java.awt.Container} for which to determine the Y
* alignment.
* @return always 0.0
*/
public float getLayoutAlignmentY(Container p)
{
return 0.0F;
}
/**
* Recalculate a possibly cached layout.
*/
public void invalidateLayout(Container p)
{
// nothing to do here yet
}
/**
* Lays out the container <code>p</code>.
* @param p the container to be laid out.
*/
public void layoutContainer(Container p)
{
addLayoutComponent(p, new Constraints(Spring.constant(0),
Spring.constant(0)));
int offsetX = p.getInsets().left;
int offsetY = p.getInsets().right;
Component[] components = p.getComponents();
for (int index = 0; index < components.length; index++)
{
Component c = components[index];
Constraints constraints = getConstraints(c);
int x = constraints.getX().getValue();
int y = constraints.getY().getValue();
int width = constraints.getWidth().getValue();
int height = constraints.getHeight().getValue();
c.setLocation(x + offsetX, y + offsetY);
c.setSize(width, height);
}
}
/**
* Calculates the maximum size of the layed out container. This
* respects the maximum sizes of all contained components.
* @param p the container to be laid out.
* @return the maximum size of the container.
*/
public Dimension maximumLayoutSize(Container p)
{
int maxX = 0;
int maxY = 0;
int offsetX = p.getInsets().left;
int offsetY = p.getInsets().right;
Component[] components = p.getComponents();
for (int index = 0; index < components.length; index++)
{
Component c = components[index];
Constraints constraints = getConstraints(c);
int x = constraints.getX().getMaximumValue();
int y = constraints.getY().getMaximumValue();
int width = constraints.getWidth().getMaximumValue();
int height = constraints.getHeight().getMaximumValue();
int rightEdge = offsetX + x + width;
if (rightEdge > maxX)
maxX = rightEdge;
int bottomEdge = offsetY + y + height;
if (bottomEdge > maxY)
maxY = bottomEdge;
}
return new Dimension(maxX, maxY);
}
/**
* Calculates the minimum size of the layed out container. This
* respects the minimum sizes of all contained components.
* @param p the container to be laid out.
* @return the minimum size of the container.
*/
public Dimension minimumLayoutSize(Container p)
{
int maxX = 0;
int maxY = 0;
int offsetX = p.getInsets().left;
int offsetY = p.getInsets().right;
Component[] components = p.getComponents();
for (int index = 0; index < components.length; index++)
{
Component c = components[index];
Constraints constraints = getConstraints(c);
int x = constraints.getX().getMinimumValue();
int y = constraints.getY().getMinimumValue();
int width = constraints.getWidth().getMinimumValue();
int height = constraints.getHeight().getMinimumValue();
int rightEdge = offsetX + x + width;
if (rightEdge > maxX)
maxX = rightEdge;
int bottomEdge = offsetY + y + height;
if (bottomEdge > maxY)
maxY = bottomEdge;
}
return new Dimension(maxX, maxY);
}
/**
* Calculates the preferred size of the layed out container. This
* respects the preferred sizes of all contained components.
* @param p the container to be laid out.
* @return the preferred size of the container.
*/
public Dimension preferredLayoutSize(Container p)
{
int maxX = 0;
int maxY = 0;
int offsetX = p.getInsets().left;
int offsetY = p.getInsets().right;
Component[] components = p.getComponents();
for (int index = 0; index < components.length; index++)
{
Component c = components[index];
Constraints constraints = getConstraints(c);
int x = constraints.getX().getPreferredValue();
int y = constraints.getY().getPreferredValue();
int width = constraints.getWidth().getPreferredValue();
int height = constraints.getHeight().getPreferredValue();
int rightEdge = offsetX + x + width;
if (rightEdge > maxX)
maxX = rightEdge;
int bottomEdge = offsetY + y + height;
if (bottomEdge > maxY)
maxY = bottomEdge;
}
return new Dimension(maxX, maxY);
}
/**
* Attaches the edge <code>e1</code> of component <code>c1</code> to
* the edge <code>e2</code> of component <code>c2</code> width the
* fixed strut <code>pad</code>.
*
* @param e1 the edge of component 1.
* @param c1 the component 1.
* @param pad the space between the components in pixels.
* @param e2 the edge of component 2.
* @param c2 the component 2.
*/
public void putConstraint(String e1, Component c1, int pad, String e2,
Component c2)
{
Constraints constraints1 = getConstraints(c1);
Constraints constraints2 = getConstraints(c2);
Spring strut = Spring.constant(pad);
Spring otherEdge = constraints2.getConstraint(e2);
constraints1.setConstraint(e1, Spring.sum(strut, otherEdge));
}
/**
* Attaches the edge <code>e1</code> of component <code>c1</code> to
* the edge <code>e2</code> of component <code>c2</code> width the
* {@link Spring} <code>s</code>.
* @param e1 the edge of component 1.
* @param c1 the component 1.
* @param s the space between the components as a {@link Spring} object.
* @param e2 the edge of component 2.
* @param c2 the component 2.
*/
public void putConstraint(String e1, Component c1, Spring s, String e2,
Component c2)
{
Constraints constraints1 = getConstraints(c1);
Constraints constraints2 = getConstraints(c2);
Spring otherEdge = constraints2.getConstraint(e2);
constraints1.setConstraint(e1, Spring.sum(s, otherEdge));
}
/**
* Removes a layout component.
* @param c the layout component to remove.
*/
public void removeLayoutComponent(Component c)
{
// do nothing here
}
}
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