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/*
* SplitterLayout.java
*/
package org.tigris.swidgets;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
/**
* A <code>ProportionalLayout</code> which recognises a contained
* <code>Splitter</code> and automatically registers components either
* side to be resized.
*
* @author Bob Tarling
*/
public class SplitterLayout extends ProportionalLayout {
private SplitterMouseListener splitterMouseListener;
public SplitterLayout() {
this(HORIZONTAL);
}
/**
* The constructor.
*
* @param orientation the orientation
*/
public SplitterLayout(Orientation orientation) {
super(orientation);
splitterMouseListener = new SplitterMouseListener();
}
/**
* @see java.awt.LayoutManager#addLayoutComponent(java.lang.String,
* java.awt.Component)
*/
public void addLayoutComponent(String name, Component comp) {
super.addLayoutComponent(name, comp);
comp.setSize(comp.getPreferredSize());
Component parent = comp.getParent();
if (parent instanceof Container) {
Container container = (Container) parent;
int componentPosition = getComponentPosition(comp);
int componentCount = container.getComponentCount();
if (comp instanceof Splitter) {
Splitter splitter = (Splitter) comp;
splitter.addMouseListener(splitterMouseListener);
if (componentPosition > 0) {
Component westComponent =
container.getComponent(componentPosition - 1);
if (!(westComponent instanceof Splitter)) {
splitter.registerComponent(Splitter.WEST,
westComponent);
}
}
if (componentPosition < componentCount - 1) {
Component eastComponent =
container.getComponent(componentPosition + 1);
if (!(eastComponent instanceof Splitter)) {
splitter.registerComponent(Splitter.EAST,
eastComponent);
}
}
}
else {
if (componentPosition > 0) {
Component westComponent =
container.getComponent(componentPosition - 1);
if (westComponent instanceof Splitter) {
Splitter splitter = (Splitter) westComponent;
splitter.registerComponent(Splitter.EAST, comp);
}
}
if (componentPosition < componentCount - 1) {
Component eastComponent =
container.getComponent(componentPosition + 1);
if (eastComponent instanceof Splitter) {
Splitter splitter = (Splitter) eastComponent;
splitter.registerComponent(Splitter.WEST, comp);
}
}
}
}
}
private void calculateProportions() {
// Find the total proportional size of all visible components
double totalProportionalLength = 0;
Enumeration enumKeys = componentTable.keys();
while (enumKeys.hasMoreElements()) {
Component comp = (Component) enumKeys.nextElement();
String size = (String) (componentTable.get(comp));
if (size.length() != 0) {
totalProportionalLength += _orientation.getLength(comp);
}
}
enumKeys = componentTable.keys();
while (enumKeys.hasMoreElements()) {
Component comp = (Component) enumKeys.nextElement();
String size = (String) (componentTable.get(comp));
if (size.length() != 0) {
double proportionalLength =
_orientation.getLength(comp) * 100
/ totalProportionalLength;
componentTable.put(comp, Double.toString(proportionalLength));
}
}
}
// Looks at all components that are register as
// proportional. Recalculates the proportions as a percentage
// based on their current size.
private void calculateProportions(Component westComponent,
Component eastComponent)
{
String westProportionalLength =
(String) (componentTable.get(westComponent));
String eastProportionalLength =
(String) (componentTable.get(eastComponent));
double westComponentLength = _orientation.getLength(westComponent);
double eastComponentLength = _orientation.getLength(eastComponent);
double totalProportionalLength =
Double.parseDouble(westProportionalLength)
+ Double.parseDouble(eastProportionalLength);
double newWestProportionalLength =
totalProportionalLength * westComponentLength
/ (westComponentLength + eastComponentLength);
double newEastProportionalLength =
totalProportionalLength - newWestProportionalLength;
componentTable.put(westComponent,
Double.toString(newWestProportionalLength));
componentTable.put(eastComponent,
Double.toString(newEastProportionalLength));
return;
}
public int getComponentPosition(Component comp) {
Component parent = comp.getParent();
if (parent instanceof Container) {
Container container = (Container) parent;
int numberOfComponents = container.getComponentCount();
for (int i = 0; i < numberOfComponents; ++i) {
if (comp == container.getComponent(i)) return i;
}
}
return -1;
}
private class SplitterMouseListener implements MouseListener {
public void mouseReleased(MouseEvent me)
{
Splitter splitter = (Splitter) me.getComponent();
Component westComponent =
splitter.getRegisteredComponent(Splitter.WEST);
Component eastComponent =
splitter.getRegisteredComponent(Splitter.EAST);
// Only act on a splitter release if it has both
// components registered
if (westComponent != null && eastComponent != null) {
String westProportionalLength =
(String) (componentTable.get(westComponent));
String eastProportionalLength =
(String) (componentTable.get(eastComponent));
if (westProportionalLength.length() != 0
&& eastProportionalLength.length() != 0)
{
// If the components resized were both flagged to
// keep proportion then we only have to
// recalculate their proportions to eachother
calculateProportions(westComponent, eastComponent);
}
else if (westProportionalLength.length() != 0
|| eastProportionalLength.length() != 0)
{
// If only one component is flagged as
// proportioned then all proportioned
// components need to have their proportions
// recalculated.
calculateProportions();
}
}
}
public void mouseEntered(MouseEvent me)
{
}
public void mouseExited(MouseEvent me)
{
}
public void mousePressed(MouseEvent me)
{
}
public void mouseClicked(MouseEvent me)
{
}
public void mouseMoved(MouseEvent me)
{
}
public void mouseDragged(MouseEvent me)
{
}
}
}
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