org.wings.plaf.css.FlowLayoutCG Maven / Gradle / Ivy

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/*
 * Copyright 2000,2005 wingS development team.
 *
 * This file is part of wingS (http://wingsframework.org).
 *
 * wingS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * Please see COPYING for the complete licence.
 */
package org.wings.plaf.css;

import org.wings.SComponent;
import org.wings.SConstants;
import org.wings.SFlowLayout;
import org.wings.SLayoutManager;
import org.wings.io.Device;

import java.awt.*;
import java.io.IOException;
import java.util.List;

public class FlowLayoutCG extends AbstractLayoutCG {
    private static final long serialVersionUID = 1L;

    /**
     * @param d the device to write the code to
     * @param l the layout manager
     * @throws IOException
     */
    @Override
    public void write(Device d, SLayoutManager l) throws IOException {
        final SFlowLayout layout = (SFlowLayout) l;
        final Insets insets = convertGapsToInset(layout.getHgap(), layout.getVgap());
        final List components = layout.getComponents();
        final int alignment = layout.getAlignment();

        openLayouterBody(d, layout);
        d.print("");

        final String alignmentStyle;
        if (alignment == SConstants.LEFT) {
            alignmentStyle = "float:left;";
        } else if (alignment == SConstants.RIGHT) {
            alignmentStyle = "float:right;";
        } else if (alignment == SConstants.CENTER) {
            alignmentStyle = "float:left; "; // Floating does not work with center :-(
        } else {
            alignmentStyle = "";
        }
        
        if ( alignment == SConstants.CENTER ) {
            d.print("");
        }

        if (components.size() > 1) {
            /* We need two spacer divs (end/beginning) so that the sourrounding flow layout takes up
               the whole space instead of 0px heigth. See http://www.alistapart.com/articles/practicalcss/. 
               The nbsp's are only needed for firefox... */
            d.print("");

            for (Object component : components) {
                printComponent(d, (SComponent) component, alignmentStyle, insets);
            }

            /* Second spacer. See upper. */
            d.print("");
        } else if (components.size() == 1) {
            // Special handling of trivial case
            //
            // Why: FlowLayout may be default for many containers.
            // BUT: The effect is that in MSIE oversized, floating componentns DO NOT lead to a scrollbar
            //
            // Try this:
            //    
            //        
            //          
            //      
            //     
            //     1000px widht
            //      
            //      
            //     
            //    
            printComponent( d, (SComponent)components.get(0), "", insets );
        }
        
        if ( alignment == SConstants.CENTER ) {
            d.print( "" );
        }
        
        d.print("");
        closeLayouterBody(d, layout);
    }
    
    private static void printComponent(Device d, SComponent component, String alignmentStlye, Insets insets)
    throws IOException {
            if (component.isVisible()) {
                Utils.printNewline(d, component);
                d.print("");
                component.write(d); // Render contained component
                Utils.printNewline(d, component);
                d.print("