Inserting image in rtf doc

Question

Hi all,
i am trying to make my own rtf editor , I've read the most of the toppics in this forum on this issue,
but I'm stucked on inserting the hex Data into the document.
Do I actually need to override ImageView?
I found a method in RTFReader (instantiated from read(InputStream in,...)) handleBinaryBlob(byte[] data).
RTFReader is private, so I cannot override this method. Should I override the read method in
RTFEditorKit and then call the read method in DefaultEditorKit, or I could just use the doc.insertString(...) with the binary data inside of the overriden RTFEditorKit read method? I will lose the functionallity of the RTFParser this way.
I know I should override read and write methods but how?
So could somebody help me on this?
The code for creating the binary data from buffered image and creating the Icon from StanislavL follows:
ImageIcon icon=(ImageIcon)StyleConstants.getIcon(attr);
if (icon!=null) {
int w=StyleConstants.getIcon(attr).getIconWidth();
int h=StyleConstants.getIcon(attr).getIconHeight();
ByteArrayOutputStream os=new ByteArrayOutputStream();
PNGCodec p=new PNGCodec();
ImageEncoder pe=p.createImageEncoder("PNG",os,null);
BufferedImage bi=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
bi.getGraphics().drawImage(icon.getImage(),0,0,null);
pe.encode(bi);
byte[] ba=os.toByteArray();
int len=ba.length,i;
StringBuffer sb=new StringBuffer(len*2);
for (i=0;i<len;i++) {
String sByte=Integer.toHexString((int)ba & 0xFF);
if (sByte.length()<2)
sb.append('0'+sByte);
else
sb.append(sByte);
String s=sb.toString();
out.write("{\\pict\\pngblip ");
out.write(s);
out.write("}");
extracting image
String content; //<- image representation
int len=content.length();
//converts to binary representation
byte[] buf=new byte[len/2];
for (int j=0; j<len/2 ;j++) {
String c1=content.substring(j*2,j*2+1);
String c2=content.substring(j*2+1,j*2+2);
byte b1=Byte.parseByte(c1,16);
byte b2=Byte.parseByte(c2,16);
buf[j]=(byte)(b1*16+b2);
//creates image from binary
Image img = Toolkit.getDefaultToolkit().createImage(buf);
ImageIcon icon=new ImageIcon();
icon.setImage(img);
if ((icon.getIconHeight()<0) || (icon.getIconWidth()<0))
return;
MutableAttributeSet attr=new SimpleAttributeSet();
StyleConstants.setIcon(attr,icon);
//inserts image in the document
document.insertString(currentOffset," ",attr);
currentOffset++;
I guess these two functions must be implied into the overriden EditKit write and read methods.
Could somebody give me a start idea?
regards
rumpi

Answer 1

Thanks for reply.
It did't helped me a lot or I'dont really understand your idea.
What you say in your postings is build my own reader and writer.
For example to open a rtf file in my jeditorpane I must read from
the input stream each byte and reimplementing AbstractFilter, RTFParser and RTFReader
I could get all headers like \par or \pic and then rtfDoc.insertString(pos, "the label content", attr) with the attributes extracted from header.
When that is the only way I am asking myself what are the swing people for?!?!
I'll try to do that myself, so I'm not asking for code but I would appreciate
some detailed info about it. For example when I dont use RTFReader anymore
I loose everything what I've got untill now. So I should read every byte opening a file
and check like in RTFParser if the first character is "\", then the next couple of bytes
untill I get the header. Then I should check which labels(text) is this header for(until the next header), so
I could insert a string with the according attribute set? For Icon when I get the
\pic header I read the byte sequence and build the picture just like you wrote.
My Editor is an applet so I've hoped I wouldn't send too much code to the client
so reimplementing RTFParser, Reader... would slow it down, but whatever.
Thats really a lot of work only because the given classes are not extendable, grrrr.
Viravan, thanks for the fast reply , but like I said , I 've already read all relevant
postings in this forum and didnt found something really helpful. I already read all
tutorials and articles from sun about this issue and I still have the feeling I'm a freshman
in this area.
I'm still angry with the swing team about it, this bug is noted since 2001 I think. grrr
regards
rumpi