/*******************************************************************************
 * Copyright (c) 2000, 2005 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
 *     
 * Port to the D programming language:
 *     Jacob Carlborg <jacob.carlborg@gmail.com>
 *******************************************************************************/
module dwt.custom.CTabFolderLayout;

import Math = tango.math.Math;

import dwt.DWT;
import dwt.custom.CTabFolder;
import dwt.custom.CTabItem;
import dwt.graphics.GC;
import dwt.graphics.Point;
import dwt.widgets.Composite;
import dwt.widgets.Control;
import dwt.widgets.Layout;

/**
 * This class provides the layout for CTabFolder
 * 
 * @see CTabFolder
 */
class CTabFolderLayout : Layout {
    protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache) {
        CTabFolder folder = cast(CTabFolder) composite;
        CTabItem[] items = folder.items;
        // preferred width of tab area to show all tabs
        int tabW = 0;
        GC gc = new GC(folder);
        for (int i = 0; i < items.length; i++) {
            if (folder.single) {
                tabW = Math.max(tabW, items[i].preferredWidth(gc, true, false));
            }
            else {
                tabW += items[i].preferredWidth(gc, i is folder.selectedIndex, false);
            }
        }
        gc.dispose();
        tabW += 3;
        if (folder.showMax)
            tabW += CTabFolder.BUTTON_SIZE;
        if (folder.showMin)
            tabW += CTabFolder.BUTTON_SIZE;
        if (folder.single)
            tabW += 3 * CTabFolder.BUTTON_SIZE / 2; //chevron
        if (folder.topRight !is null) {
            Point pt = folder.topRight.computeSize(DWT.DEFAULT, folder.tabHeight, flushCache);
            tabW += 3 + pt.x;
        }
        if (!folder.single && !folder.simple)
            tabW += folder.curveWidth - 2 * folder.curveIndent;

        int controlW = 0;
        int controlH = 0;
        // preferred size of controls in tab items
        for (int i = 0; i < items.length; i++) {
            Control control = items[i].getControl();
            if (control !is null && !control.isDisposed()) {
                Point size = control.computeSize(wHint, hHint, flushCache);
                controlW = Math.max(controlW, size.x);
                controlH = Math.max(controlH, size.y);
            }
        }

        int minWidth = Math.max(tabW, controlW);
        int minHeight = (folder.minimized) ? 0 : controlH;
        if (minWidth is 0)
            minWidth = CTabFolder.DEFAULT_WIDTH;
        if (minHeight is 0)
            minHeight = CTabFolder.DEFAULT_HEIGHT;

        if (wHint !is DWT.DEFAULT)
            minWidth = wHint;
        if (hHint !is DWT.DEFAULT)
            minHeight = hHint;

        return new Point(minWidth, minHeight);
    }

    protected bool flushCache (Control control) {
        return true;
    }

    protected void layout (Composite composite, bool flushCache) {
        CTabFolder folder = cast(CTabFolder) composite;
        // resize content
        if (folder.selectedIndex !is -1) {
            Control control = folder.items[folder.selectedIndex].getControl();
            if (control !is null && !control.isDisposed()) {
                control.setBounds(folder.getClientArea());
            }
        }
    }
}