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SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented.
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/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.custom;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
/**
* This class provides the layout for SashForm
*
* @see SashForm
*/
class SashFormLayout extends Layout {
protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
SashForm sashForm = (SashForm)composite;
Control[] cArray = sashForm.getControls(true);
int width = 0;
int height = 0;
if (cArray.length == 0) {
if (wHint != SWT.DEFAULT) width = wHint;
if (hHint != SWT.DEFAULT) height = hHint;
return new Point(width, height);
}
// determine control sizes
boolean vertical = sashForm.getOrientation() == SWT.VERTICAL;
int maxIndex = 0;
int maxValue = 0;
for (int i = 0; i < cArray.length; i++) {
if (vertical) {
Point size = cArray[i].computeSize(wHint, SWT.DEFAULT, flushCache);
if (size.y > maxValue) {
maxIndex = i;
maxValue = size.y;
}
width = Math.max(width, size.x);
} else {
Point size = cArray[i].computeSize(SWT.DEFAULT, hHint, flushCache);
if (size.x > maxValue) {
maxIndex = i;
maxValue = size.x;
}
height = Math.max(height, size.y);
}
}
// get the ratios
long[] ratios = new long[cArray.length];
long total = 0;
for (int i = 0; i < cArray.length; i++) {
Object data = cArray[i].getLayoutData();
if (data != null && data instanceof SashFormData) {
ratios[i] = ((SashFormData)data).weight;
} else {
data = new SashFormData();
cArray[i].setLayoutData(data);
((SashFormData)data).weight = ratios[i] = ((200 << 16) + 999) / 1000;
}
total += ratios[i];
}
if (ratios[maxIndex] > 0) {
int sashwidth = sashForm.sashes.length > 0 ? sashForm.SASH_WIDTH + sashForm.sashes [0].getBorderWidth() * 2 : sashForm.SASH_WIDTH;
if (vertical) {
height += (int)(total * maxValue / ratios[maxIndex]) + (cArray.length - 1) * sashwidth;
} else {
width += (int)(total * maxValue / ratios[maxIndex]) + (cArray.length - 1) * sashwidth;
}
}
width += sashForm.getBorderWidth()*2;
height += sashForm.getBorderWidth()*2;
if (wHint != SWT.DEFAULT) width = wHint;
if (hHint != SWT.DEFAULT) height = hHint;
return new Point(width, height);
}
protected boolean flushCache(Control control) {
return true;
}
protected void layout(Composite composite, boolean flushCache) {
SashForm sashForm = (SashForm)composite;
Rectangle area = sashForm.getClientArea();
if (area.width <= 1 || area.height <= 1) return;
Control[] newControls = sashForm.getControls(true);
if (sashForm.controls.length == 0 && newControls.length == 0) return;
sashForm.controls = newControls;
Control[] controls = sashForm.controls;
if (sashForm.maxControl != null && !sashForm.maxControl.isDisposed()) {
for (int i= 0; i < controls.length; i++){
if (controls[i] != sashForm.maxControl) {
controls[i].setBounds(-200, -200, 0, 0);
} else {
controls[i].setBounds(area);
}
}
return;
}
// keep just the right number of sashes
if (sashForm.sashes.length < controls.length - 1) {
Sash[] newSashes = new Sash[controls.length - 1];
System.arraycopy(sashForm.sashes, 0, newSashes, 0, sashForm.sashes.length);
for (int i = sashForm.sashes.length; i < newSashes.length; i++) {
newSashes[i] = sashForm.createSash();
}
sashForm.sashes = newSashes;
}
if (sashForm.sashes.length > controls.length - 1) {
if (controls.length == 0) {
for (int i = 0; i < sashForm.sashes.length; i++) {
sashForm.sashes[i].dispose();
}
sashForm.sashes = new Sash[0];
} else {
Sash[] newSashes = new Sash[controls.length - 1];
System.arraycopy(sashForm.sashes, 0, newSashes, 0, newSashes.length);
for (int i = controls.length - 1; i < sashForm.sashes.length; i++) {
sashForm.sashes[i].dispose();
}
sashForm.sashes = newSashes;
}
}
if (controls.length == 0) return;
Sash[] sashes = sashForm.sashes;
// get the ratios
long[] ratios = new long[controls.length];
long total = 0;
for (int i = 0; i < controls.length; i++) {
Object data = controls[i].getLayoutData();
if (data != null && data instanceof SashFormData) {
ratios[i] = ((SashFormData)data).weight;
} else {
data = new SashFormData();
controls[i].setLayoutData(data);
((SashFormData)data).weight = ratios[i] = ((200 << 16) + 999) / 1000;
}
total += ratios[i];
}
int sashwidth = sashes.length > 0 ? sashForm.SASH_WIDTH + sashes [0].getBorderWidth() * 2 : sashForm.SASH_WIDTH;
if (sashForm.getOrientation() == SWT.HORIZONTAL) {
int width = (int)(ratios[0] * (area.width - sashes.length * sashwidth) / total);
int x = area.x;
controls[0].setBounds(x, area.y, width, area.height);
x += width;
for (int i = 1; i < controls.length - 1; i++) {
sashes[i - 1].setBounds(x, area.y, sashwidth, area.height);
x += sashwidth;
width = (int)(ratios[i] * (area.width - sashes.length * sashwidth) / total);
controls[i].setBounds(x, area.y, width, area.height);
x += width;
}
if (controls.length > 1) {
sashes[sashes.length - 1].setBounds(x, area.y, sashwidth, area.height);
x += sashwidth;
width = area.width - x;
controls[controls.length - 1].setBounds(x, area.y, width, area.height);
}
} else {
int height = (int)(ratios[0] * (area.height - sashes.length * sashwidth) / total);
int y = area.y;
controls[0].setBounds(area.x, y, area.width, height);
y += height;
for (int i = 1; i < controls.length - 1; i++) {
sashes[i - 1].setBounds(area.x, y, area.width, sashwidth);
y += sashwidth;
height = (int)(ratios[i] * (area.height - sashes.length * sashwidth) / total);
controls[i].setBounds(area.x, y, area.width, height);
y += height;
}
if (controls.length > 1) {
sashes[sashes.length - 1].setBounds(area.x, y, area.width, sashwidth);
y += sashwidth;
height = area.height - y;
controls[controls.length - 1].setBounds(area.x, y, area.width, height);
}
}
}
}