swtimagehelper.java

A translator that converts Qt Designer UI files into SWT java classes. Use the power of Qt Designer

/* This file is part of ui2swt.
 *
 * $Revision: 1.5 $
 * $Date: 2007/01/20 10:19:31 $
 * $Name:  $
 *
 * Copyright (C) 2006-2007 James Forbes, All Rights Reserved.
 *
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the authors be held liable for any damages arising from the
 * use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 *  1. The origin of this software must not be misrepresented; you must not
 *     claim that you wrote the original software. If you use this software in
 *     a product, an acknowledgment in the product documentation would be
 *     appreciated but is not required.
 *
 *  2. Altered source versions must be plainly marked as such, and must not be
 *     misrepresented as being the original software.
 *
 *  3. This notice may not be removed or altered from any source distribution.
 */

package ui2swt.swt;

import java.util.HashSet;
import java.util.Set;

import ui2swt.ClassDefinition;
import ui2swt.Image;
import ui2swt.UIDefinition;
import ui2swt.Widget;


public class SWTImageHelper extends SWTHelper
{
    private static final String UI_IMAGE_NAME           = "name";
    private static final String UI_IMAGE_DATA           = "data";
    private static final String UI_IMAGE_FORMAT         = "data.format";
    private static final String UI_IMAGE_FORMAT_XPM_GZ  = "XPM.GZ";

    private static final String UI_IMAGE_PIXMAP         = "pixmap.pixmap";
    private static final String UI_IMAGE_ICON_SET       = "icon.iconset";
    
    private static final String SWT_IMAGE_DATA_CONSTANT = "swt.imageData.constant";
    
    private static final Set translatedImages = new HashSet();
    
    
    //
    //
    //
    
    public static boolean hasImage(
        UIDefinition    iUIDefinition,
        Widget          iWidget )
    {
        boolean result = false;
        
        if ( iWidget.containsProperty(UI_IMAGE_PIXMAP) )
        {
            result = true;
        }
        else if ( iWidget.containsProperty(UI_IMAGE_ICON_SET) )
        {
            result = true;
        }
        
        return result;
    }
    
    
    public static String getImage(
        UIDefinition    iUIDefinition,
        Widget          iWidget )
    {
        String result = null;
        
        if ( iWidget.containsProperty(UI_IMAGE_PIXMAP) )
        {
            result = iWidget.getProperty(UI_IMAGE_PIXMAP);
        }
        else if ( iWidget.containsProperty(UI_IMAGE_ICON_SET) )
        {
            result = iWidget.getProperty(UI_IMAGE_ICON_SET);
        }
        
        return result;
    }
    
    
    //
    //
    //
    
    public static boolean isCompressed(
        UIDefinition    iUIDefinition,
        Image           iImage )
    {
        String imageFormat = iImage.getProperty(UI_IMAGE_FORMAT);
        
        if ( UI_IMAGE_FORMAT_XPM_GZ.equals(imageFormat) )
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    
    
    //
    //
    //

    public static void generateSetImageCode(
        UIDefinition    iUIDefinition,
        Widget          iWidget,
        String          iPixmap,
        ClassDefinition iClassDefinition )
    {
        switch (iUIDefinition.getVersion())
        {
            case UIDefinition.VERSION_2:
            case UIDefinition.VERSION_3:
            {
                Image image = iUIDefinition.getImage(UI_IMAGE_NAME, iPixmap);
                
                if ( image == null )
                {
                    System.err.println("WARNING: Could not find image: "+iPixmap);
                }
                else
                {
                    translateImage(iUIDefinition, image, iClassDefinition);
                    
                    if ( isCompressed(iUIDefinition, image) )
                    {
                        String widgetVar         = iWidget.getProperty(SWT_VAR);
                        String imageDataConstant = image.getProperty(SWT_IMAGE_DATA_CONSTANT);

                        iClassDefinition
                            .addImport("org.eclipse.swt.graphics.Image")
                            .addImport("java.io.ByteArrayInputStream")
                            .addImport("java.util.zip.InflaterInputStream")
                            .getConstructor().addMethodCall1(
                                widgetVar,
                                "setImage",
                                "new Image("+widgetVar+".getDisplay(),new InflaterInputStream(new ByteArrayInputStream("+imageDataConstant+")))");
                    }
                    else
                    {
                        String widgetVar         = iWidget.getProperty(SWT_VAR);
                        String imageDataConstant = image.getProperty(SWT_IMAGE_DATA_CONSTANT);

                        iClassDefinition
                            .addImport("org.eclipse.swt.graphics.Image")
                            .addImport("java.io.ByteArrayInputStream")
                            .getConstructor().addMethodCall1(
                                widgetVar,
                                "setImage",
                                "new Image("+widgetVar+".getDisplay(),new ByteArrayInputStream("+imageDataConstant+"))");
                    }
                }
            }
            break;

                
            case UIDefinition.VERSION_4:
            {
                String widgetVar = iWidget.getProperty(SWT_VAR);

                iClassDefinition
                    .addImport("org.eclipse.swt.graphics.Image")
                    .getConstructor().addMethodCall1(
                        widgetVar,
                        "setImage",
                        "new Image("+widgetVar+".getDisplay(),\""+iPixmap+"\")");
            }
            break;
        }
    }
    
    
    //
    //
    //
    
    private static void translateImage(
        UIDefinition    iUIDefinition,
        Image           iImage,
        ClassDefinition iClassDefinition )
    {
        if ( ! translatedImages.contains(iImage) )
        {
            String       name     = iImage.getProperty(UI_IMAGE_NAME);
            String       data     = iImage.getProperty(UI_IMAGE_DATA);
            String       constant = name.toUpperCase()+"_DATA";
            StringBuffer value    = new StringBuffer();
            
            int length = data.length();
            
            value.append("new byte[]{");
            
            if ( length > 0 )
            {
                value.append(convertHexByte(data.charAt(0), data.charAt(1)));
//                value.append("(byte)0x");
//                value.append(data.charAt(0));
//                value.append(data.charAt(1));
                
                for ( int i = 2; i < length; i+=2 )
                {
                    value.append(",");
                    value.append(convertHexByte(data.charAt(i), data.charAt(i+1)));
//                    value.append(",(byte)0x");
//                    value.append(data.charAt(i));
//                    value.append(data.charAt(i+1));
                }
            }
            
            value.append("}");

            iClassDefinition.addConstant("public", "byte[]", constant, value);

            iImage.setProperty(SWT_IMAGE_DATA_CONSTANT, constant);
            translatedImages.add(iImage);
        }
    }
    
    
    private static byte convertHexByte( char ch1, char ch2 )
    {
        return (byte)((convertHexChar(ch1) << 4) | convertHexChar(ch2));
    }
    
    
    private static int convertHexChar( char ch )
    {
        if ( (ch >= '0') && (ch <= '9') )
        {
            return (ch - '0');
        }
        else if ((ch >= 'a') && (ch <= 'f') )
        {
            return (ch - 'a' + 10);
        }
        else if ((ch >= 'A') && (ch <= 'F') )
        {
            return (ch - 'A' + 10);
        }
        else
        {
            return 0;
        }
    }
}