/*
* Sun Public License Notice
*
* The contents of this file are subject to the Sun Public License
* Version 1.0 (the "License"). You may not use this file except in
* compliance with the License. A copy of the License is available at
* http://www.sun.com/
*
* The Original Code is Forte for Java, Community Edition. The Initial
* Developer of the Original Code is Sun Microsystems, Inc. Portions
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*/
package org.openide.awt;
import java.awt.*;
/** EqualFlowLayout is a layout manager that works the same way as FlowLayout.
* The only difference is that it sizes the components so that they all have the same width
* (a width of widest component).
*
* @author Ian Formanek
* @version 1.00, Nov 12, 1998
*/
public class EqualFlowLayout extends FlowLayout {
/** A JDK 1.1 serial version UID */
static final long serialVersionUID = -1996929627282401218L;
/**
* Constructs a new Flow Layout with a centered alignment and a
* default 5-unit horizontal and vertical gap.
* @since JDK1.0
*/
public EqualFlowLayout() {
super ();
}
/**
* Constructs a new Flow Layout with the specified alignment and a
* default 5-unit horizontal and vertical gap.
* The value of the alignment argument must be one of
* <code>FlowLayout.LEFT</code>, <code>FlowLayout.RIGHT</code>,
* or <code>FlowLayout.CENTER</code>.
* @param align the alignment value
* @since JDK1.0
*/
public EqualFlowLayout(int align) {
super (align);
}
/**
* Creates a new flow layout manager with the indicated alignment
* and the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>FlowLayout.LEFT</code>, <code>FlowLayout.RIGHT</code>,
* or <code>FlowLayout.CENTER</code>.
* @param align the alignment value.
* @param hgap the horizontal gap between components.
* @param vgap the vertical gap between components.
* @since JDK1.0
*/
public EqualFlowLayout(int align, int hgap, int vgap) {
super (align, hgap, vgap);
}
private int getMaximumWidth (Container target) {
int maxWidth = 0;
synchronized (target.getTreeLock()) {
int nmembers = target.getComponentCount();
for (int i = 0 ; i < nmembers ; i++) {
Component m = target.getComponent(i);
if (m.isVisible ()) {
Dimension d = m.getPreferredSize();
maxWidth = Math.max(d.width, maxWidth);
}
}
}
return maxWidth;
}
/**
* Returns the preferred dimensions for this layout given the components
* in the specified target container.
* @param target the component which needs to be laid out
* @return the preferred dimensions to lay out the
* subcomponents of the specified container.
* @see Container
* @see #minimumLayoutSize
* @see java.awt.Container#getPreferredSize
* @since JDK1.0
*/
public Dimension preferredLayoutSize(Container target) {
int maxWidth = getMaximumWidth (target);
synchronized (target.getTreeLock()) {
Dimension dim = new Dimension(0, 0);
int nmembers = target.getComponentCount();
for (int i = 0 ; i < nmembers ; i++) {
Component m = target.getComponent(i);
if (m.isVisible ()) {
Dimension d = m.getPreferredSize();
dim.height = Math.max(dim.height, d.height);
if (i > 0) {
dim.width += getHgap ();
}
dim.width += maxWidth;
}
}
Insets insets = target.getInsets();
dim.width += insets.left + insets.right + getHgap ()*2;
dim.height += insets.top + insets.bottom + getVgap ()*2;
return dim;
}
}
/**
* Returns the minimum dimensions needed to layout the components
* contained in the specified target container.
* @param target the component which needs to be laid out
* @return the minimum dimensions to lay out the
* subcomponents of the specified container.
* @see #preferredLayoutSize
* @see java.awt.Container
* @see java.awt.Container#doLayout
* @since JDK1.0
*/
public Dimension minimumLayoutSize(Container target) {
synchronized (target.getTreeLock()) {
Dimension dim = new Dimension(0, 0);
int nmembers = target.getComponentCount();
for (int i = 0 ; i < nmembers ; i++) {
Component m = target.getComponent(i);
if (m.isVisible ()) {
Dimension d = m.getMinimumSize();
dim.height = Math.max(dim.height, d.height);
if (i > 0) {
dim.width += getHgap ();
}
dim.width += d.width;
}
}
Insets insets = target.getInsets();
dim.width += insets.left + insets.right + getHgap ()*2;
dim.height += insets.top + insets.bottom + getVgap ()*2;
return dim;
}
}
/**
* Centers the elements in the specified row, if there is any slack.
* @param target the component which needs to be moved
* @param x the x coordinate
* @param y the y coordinate
* @param width the width dimensions
* @param height the height dimensions
* @param rowStart the beginning of the row
* @param rowEnd the the ending of the row
*/
private void moveComponents2(Container target, int x, int y, int width, int height, int rowStart, int rowEnd) {
synchronized (target.getTreeLock()) {
switch (getAlignment ()) {
case LEFT:
break;
case CENTER:
x += width / 2;
break;
case RIGHT:
x += width;
break;
}
for (int i = rowStart ; i < rowEnd ; i++) {
Component m = target.getComponent(i);
if (m.isVisible ()) {
m.setLocation(x, y + (height - m.getSize ().height) / 2);
x += getHgap () + m.getSize ().width;
}
}
}
}
/**
* Lays out the container. This method lets each component take
* its preferred size by reshaping the components in the
* target container in order to satisfy the constraints of
* this <code>FlowLayout</code> object.
* @param target the specified component being laid out.
* @see Container
* @see java.awt.Container#doLayout
* @since JDK1.0
*/
public void layoutContainer(Container target) {
int maxWidth = getMaximumWidth (target);
synchronized (target.getTreeLock()) {
Insets insets = target.getInsets();
int maxwidth = target.getSize ().width - (insets.left + insets.right + getHgap ()*2);
int nmembers = target.getComponentCount();
int x = 0, y = insets.top + getVgap ();
int rowh = 0, start = 0;
for (int i = 0 ; i < nmembers ; i++) {
Component m = target.getComponent(i);
if (m.isVisible ()) {
Dimension d = m.getPreferredSize();
d.width = maxWidth;
m.setSize(d.width, d.height);
if ((x == 0) || ((x + d.width) <= maxwidth)) {
if (x > 0) {
x += getHgap ();
}
x += d.width;
rowh = Math.max(rowh, d.height);
} else {
moveComponents2(target, insets.left + getHgap (), y, maxwidth - x, rowh, start, i);
x = d.width;
y += getVgap () + rowh;
rowh = d.height;
start = i;
}
}
}
moveComponents2(target, insets.left + getHgap (), y, maxwidth - x, rowh, start, nmembers);
}
}
}
/*
* Log
* 4 Gandalf 1.3 10/22/99 Ian Formanek NO SEMANTIC CHANGE - Sun
* Microsystems Copyright in File Comment
* 3 Gandalf 1.2 6/8/99 Ian Formanek ---- Package Change To
* org.openide ----
* 2 Gandalf 1.1 1/6/99 Ian Formanek Reflecting changes in
* location of package "awt"
* 1 Gandalf 1.0 1/5/99 Ian Formanek
* $
*/