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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 ViewForm
 * 
 * @see ViewForm
 */
class ViewFormLayout extends Layout {

protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
	ViewForm form = (ViewForm)composite;
	Control left = form.topLeft;
	Control center = form.topCenter;
	Control right = form.topRight;
	Control content = form.content;
	
	Point leftSize = new Point(0, 0);
	if (left != null) {
		leftSize = computeChildSize(left, SWT.DEFAULT, SWT.DEFAULT, flushCache);
	}
	Point centerSize = new Point(0, 0);
	if (center != null) {
		 centerSize = computeChildSize(center, SWT.DEFAULT, SWT.DEFAULT, flushCache);
	}
	Point rightSize = new Point(0, 0);
	if (right != null) {
		 rightSize = computeChildSize(right, SWT.DEFAULT, SWT.DEFAULT, flushCache);
	}
	Point size = new Point(0, 0);
	// calculate width of title bar
	if (form.separateTopCenter ||
	    (wHint != SWT.DEFAULT &&  leftSize.x + centerSize.x + rightSize.x > wHint)) {
		size.x = leftSize.x + rightSize.x;
		if (leftSize.x > 0 && rightSize.x > 0) size.x += form.horizontalSpacing;
		size.x = Math.max(centerSize.x, size.x);
		size.y = Math.max(leftSize.y, rightSize.y);
		if (center != null){
			size.y += centerSize.y;
			if (left != null ||right != null)size.y += form.verticalSpacing;
		}	
	} else {
		size.x = leftSize.x + centerSize.x + rightSize.x;
		int count = -1;
		if (leftSize.x > 0) count++;
		if (centerSize.x > 0) count++;
		if (rightSize.x > 0) count++;
		if (count > 0) size.x += count * form.horizontalSpacing;
		size.y = Math.max(leftSize.y, Math.max(centerSize.y, rightSize.y));
	}
	
	if (content != null) {
		if (left != null || right != null || center != null) size.y += 1; // allow space for a vertical separator
		Point contentSize = new Point(0, 0);
		contentSize = computeChildSize(content, SWT.DEFAULT, SWT.DEFAULT, flushCache); 
		size.x = Math.max (size.x, contentSize.x);
		size.y += contentSize.y;
		if (size.y > contentSize.y) size.y += form.verticalSpacing;
	}
	
	size.x += 2*form.marginWidth;
	size.y += 2*form.marginHeight;
	
	if (wHint != SWT.DEFAULT) size.x  = wHint;
	if (hHint != SWT.DEFAULT) size.y = hHint;
	
	return size;
}

Point computeChildSize(Control control, int wHint, int hHint, boolean flushCache) {
	Object data = control.getLayoutData();
	if (data == null || !(data instanceof CLayoutData)) {
		data = new CLayoutData();
		control.setLayoutData(data);
	}
	return ((CLayoutData)data).computeSize(control, wHint, hHint, flushCache);
}

int computeTrim(Control c) {
	if (c instanceof Scrollable) {
		Rectangle rect = ((Scrollable) c).computeTrim (0, 0, 0, 0);
		return rect.width;
	}
	return c.getBorderWidth () * 2;
}

protected boolean flushCache(Control control) {
	Object data = control.getLayoutData();
	if (data != null && data instanceof CLayoutData) ((CLayoutData)data).flushCache();
	return true;
}

protected void layout(Composite composite, boolean flushCache) {
	ViewForm form = (ViewForm)composite;
	Control left = form.topLeft;
	Control center = form.topCenter;
	Control right = form.topRight;
	Control content = form.content;
	
	Rectangle rect = composite.getClientArea();
	
	Point leftSize = new Point(0, 0);
	if (left != null && !left.isDisposed()) {
		leftSize = computeChildSize(left, SWT.DEFAULT, SWT.DEFAULT, flushCache);
	}
	Point centerSize = new Point(0, 0);
	if (center != null && !center.isDisposed()) {
		 centerSize = computeChildSize(center, SWT.DEFAULT, SWT.DEFAULT, flushCache);
	}
	Point rightSize = new Point(0, 0);
	if (right != null && !right.isDisposed()) {
		 rightSize = computeChildSize(right, SWT.DEFAULT, SWT.DEFAULT, flushCache);
	}
	
	int minTopWidth = leftSize.x + centerSize.x + rightSize.x + 2*form.marginWidth + 2*form.highlight;
	int count = -1;
	if (leftSize.x > 0) count++;
	if (centerSize.x > 0) count++;
	if (rightSize.x > 0) count++;
	if (count > 0) minTopWidth += count * form.horizontalSpacing;
		
	int x = rect.x + rect.width - form.marginWidth - form.highlight;
	int y = rect.y + form.marginHeight + form.highlight;
	
	boolean top = false;
	if (form.separateTopCenter || minTopWidth > rect.width) {
		int topHeight = Math.max(rightSize.y, leftSize.y);
		if (right != null && !right.isDisposed()) {
			top = true;
			x -= rightSize.x;
			right.setBounds(x, y, rightSize.x, topHeight);
			x -= form.horizontalSpacing;
		}
		if (left != null && !left.isDisposed()) {
			top = true;
			int trim = computeTrim(left);
			int leftW = x - rect.x - form.marginWidth - form.highlight - trim;
			leftSize = computeChildSize(left, leftW, SWT.DEFAULT, false);
			left.setBounds(rect.x + form.marginWidth + form.highlight, y, leftSize.x, topHeight);
		}
		if (top) y += topHeight + form.verticalSpacing;
		if (center != null && !center.isDisposed()) {
			top = true;
			int trim = computeTrim(center);
			int w = rect.width - 2*form.marginWidth - 2*form.highlight - trim;
			Point size = computeChildSize(center, w, SWT.DEFAULT, false);
			if (size.x < centerSize.x) {
				centerSize = size;
			}
			center.setBounds(rect.x + rect.width - form.marginWidth - form.highlight - centerSize.x, y, centerSize.x, centerSize.y);
			y += centerSize.y + form.verticalSpacing;
		}		
	} else {
		int topHeight = Math.max(rightSize.y, Math.max(centerSize.y, leftSize.y));
		if (right != null && !right.isDisposed()) {
			top = true;
			x -= rightSize.x;
			right.setBounds(x, y, rightSize.x, topHeight);
			x -= form.horizontalSpacing;
		}
		if (center != null && !center.isDisposed()) {
			top = true;
			x -= centerSize.x;
			center.setBounds(x, y, centerSize.x, topHeight);
			x -= form.horizontalSpacing;
		}
		if (left != null && !left.isDisposed()) {
			top = true;
			Rectangle trim = left instanceof Composite ? ((Composite)left).computeTrim(0, 0, 0, 0) : new Rectangle(0, 0, 0, 0);
			int w = x - rect.x - form.marginWidth - form.highlight - trim.width;
			int h = topHeight - trim.height;
			leftSize = computeChildSize(left, w, h, false);
			left.setBounds(rect.x + form.marginWidth + form.highlight, y, leftSize.x, topHeight);
		}
		if (top)y += topHeight + form.verticalSpacing;
	}
	int oldSeperator = form.separator;
	form.separator = -1;
	if (content != null && !content.isDisposed()) {
		if (left != null || right!= null || center != null){
			form.separator = y;
			y++;
		}
		 content.setBounds(rect.x + form.marginWidth + form.highlight, y, rect.width - 2 * form.marginWidth - 2*form.highlight, rect.y + rect.height - y - form.marginHeight - form.highlight);
	}
	if (oldSeperator != form.separator) {
		int t, b;
		if (oldSeperator == -1) {
			t = form.separator;
			b = form.separator + 1;
		} else if (form.separator == -1) {
			t = oldSeperator;
			b = oldSeperator + 1;
		} else {
			t = Math.min(form.separator, oldSeperator);
			b = Math.max(form.separator, oldSeperator);
		}
		form.redraw(form.borderLeft, t, form.getSize().x - form.borderLeft - form.borderRight, b - t, false);
	}
}
}