toolbarlayout.java

EclipseTrader is a stock exchange analysis system, featuring shares pricing watch, intraday and hi

/*
 * Copyright (c) 2004-2006 Marco Maccaferri 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 net.sourceforge.eclipsetrader.core.ui.internal;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Layout;

public class ToolbarLayout extends Layout
{
    private static final int SPACING = 5;
    private static final int EXTRA_BUSY_SPACING = 2;
    private static final int MARGIN = 2;

    /* (non-Javadoc)
     * @see org.eclipse.swt.widgets.Layout#computeSize(org.eclipse.swt.widgets.Composite, int, int, boolean)
     */
    protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache)
    {
        if (hHint != SWT.DEFAULT)
            return new Point(wHint, hHint);

        Control[] children = composite.getChildren();
        int h = 0;
        int size = children.length;
        for (int i = 0; i < size; i++)
        {
            h = Math.max(h, children[i].computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
        }

        return new Point(wHint, h + MARGIN * 2);
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.widgets.Layout#layout(org.eclipse.swt.widgets.Composite, boolean)
     */
    protected void layout(Composite composite, boolean flushCache)
    {
        Control[] children = composite.getChildren();
        Rectangle r = composite.getClientArea();

        int size = children.length;
        Point[] sizes = new Point[size];
        for (int i = 0; i < size; i++)
        {
            sizes[i] = children[i].computeSize(SWT.DEFAULT, SWT.DEFAULT);
        }

        int h = r.height - MARGIN * 2;

        // put busy icon at right with a little extra spacing
        int busy = size - 1;
        children[busy].setBounds(r.x + r.width - MARGIN - sizes[busy].x, r.y + MARGIN + (h - sizes[busy].y) / 2, sizes[busy].x, sizes[busy].y);

        // find combo
        int combo = -1;
        int tw = r.width - MARGIN * 2 - (size - 1) * SPACING - sizes[size - 1].x - EXTRA_BUSY_SPACING;
        for (int i = 0; i < size - 1; i++)
        {
            if (children[i] instanceof Combo)
                combo = i;
            else
                tw -= sizes[i].x;
        }
        if (combo >= 0)
            sizes[combo].x = tw;

        // space out other children with their standard size, give combo all
        // remaining space (if it exists)
        int x = MARGIN;
        for (int i = 0; i < size - 1; i++)
        {
            children[i].setBounds(r.x + x, r.y + MARGIN + (h - sizes[i].y) / 2, sizes[i].x, sizes[i].y);
            x += SPACING + sizes[i].x;
        }
    }
}