java absoluteconstraints_Java se AbsoluteLayout布局源码

摘自JDK 1.6 源码：

package org.netbeans.lib.awtextra;

import java.awt.Component;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.LayoutManager2;

import java.io.Serializable;

import java.util.Enumeration;

import java.util.Hashtable;

public class AbsoluteLayout

implements LayoutManager2, Serializable

{

static final long serialVersionUID = -1919857869177070440L;

protected Hashtable constraints = new Hashtable();

public void addLayoutComponent(String paramString, Component paramComponent)

{

throw new IllegalArgumentException();

}

public void removeLayoutComponent(Component paramComponent)

{

this.constraints.remove(paramComponent);

}

public Dimension preferredLayoutSize(Container paramContainer)

{

int i = 0;

int j = 0;

Enumeration localEnumeration = this.constraints.keys();

while (localEnumeration.hasMoreElements())

{

Component localComponent = (Component)localEnumeration.nextElement();

AbsoluteConstraints localAbsoluteConstraints = (AbsoluteConstraints)this.constraints.get(localComponent);

Dimension localDimension = localComponent.getPreferredSize();

int k = localAbsoluteConstraints.getWidth();

if (k == -1)

k = localDimension.width;

int m = localAbsoluteConstraints.getHeight();

if (m == -1)

m = localDimension.height;

if (localAbsoluteConstraints.x + k > i)

i = localAbsoluteConstraints.x + k;

if (localAbsoluteConstraints.y + m > j)

j = localAbsoluteConstraints.y + m;

}

return new Dimension(i, j);

}

public Dimension minimumLayoutSize(Container paramContainer)

{

int i = 0;

int j = 0;

Enumeration localEnumeration = this.constraints.keys();

while (localEnumeration.hasMoreElements())

{

Component localComponent = (Component)localEnumeration.nextElement();

AbsoluteConstraints localAbsoluteConstraints = (AbsoluteConstraints)this.constraints.get(localComponent);

Dimension localDimension = localComponent.getMinimumSize();

int k = localAbsoluteConstraints.getWidth();

if (k == -1)

k = localDimension.width;

int m = localAbsoluteConstraints.getHeight();

if (m == -1)

m = localDimension.height;

if (localAbsoluteConstraints.x + k > i)

i = localAbsoluteConstraints.x + k;

if (localAbsoluteConstraints.y + m > j)

j = localAbsoluteConstraints.y + m;

}

return new Dimension(i, j);

}

public void layoutContainer(Container paramContainer)

{

Enumeration localEnumeration = this.constraints.keys();

while (localEnumeration.hasMoreElements())

{

Component localComponent = (Component)localEnumeration.nextElement();

AbsoluteConstraints localAbsoluteConstraints = (AbsoluteConstraints)this.constraints.get(localComponent);

Dimension localDimension = localComponent.getPreferredSize();

int i = localAbsoluteConstraints.getWidth();

if (i == -1)

i = localDimension.width;

int j = localAbsoluteConstraints.getHeight();

if (j == -1)

j = localDimension.height;

localComponent.setBounds(localAbsoluteConstraints.x, localAbsoluteConstraints.y, i, j);

}

}

public void addLayoutComponent(Component paramComponent, Object paramObject)

{

if (!(paramObject instanceof AbsoluteConstraints))

throw new IllegalArgumentException();

this.constraints.put(paramComponent, paramObject);

}

public Dimension maximumLayoutSize(Container paramContainer)

{

return new Dimension(2147483647, 2147483647);

}

public float getLayoutAlignmentX(Container paramContainer)

{

return 0.0F;

}

public float getLayoutAlignmentY(Container paramContainer)

{

return 0.0F;

}

public void invalidateLayout(Container paramContainer)

{

}

}

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