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Thread: Unable to Drop the Text.

  1. #1
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    Default Unable to Drop the Text.

    Hello,
    I am using following code to do formatted copy paste in JTextPane in java.But now I also want to drop the text of JButton into JTextPane.Please help me.

    txt is JTextPane that is defined in another class.

     
           txt.setTransferHandler(new StyleTransferHandler());
     
     
         class StyleTransferHandler extends TransferHandler {
     
          String mimeType = DataFlavor.javaJVMLocalObjectMimeType +
          ";class=StyledString";
          DataFlavor styledStringFlavor;
          public StyleTransferHandler() {
          try {
    	  styledStringFlavor = new DataFlavor(mimeType);
          } catch(ClassNotFoundException e) {
          System.out.println("Unable to create styledStringFlavor");
          }
          }
          public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) {
          for(int j = 0; j < transferFlavors.length; j++) {
          if(styledStringFlavor.equals(transferFlavors[j]))
          return true;
          }
          return false;
          }
          protected Transferable createTransferable(JComponent c) {
           txt = (UndoableTextArea)c;
          int start = txt.getSelectionStart();
          int end = txt.getSelectionEnd();
          StyledString ss = new StyledString("");
          if(start != -1 && start != end) {
          String text = txt.getSelectedText();
          ss = new StyledString(text);
          StyledDocument doc = txt.getStyledDocument();
          extractAttributes(doc, start, end, ss);
          }
          return new StyledStringTransferable(ss);
          }
          private void extractAttributes(StyledDocument doc, int selectionStart,
          int selectionEnd, StyledString styledStr) {
          int pos = selectionStart;
          styledStr.logicalStyle = doc.getLogicalStyle(pos);
          while(pos < selectionEnd) {
          Element element = doc.getCharacterElement(pos);
          AttributeSet attrs = element.getAttributes();
          int endOffset = element.getEndOffset();
          int end = (endOffset < selectionEnd) ? endOffset : selectionEnd;
          styledStr.addAttributes(attrs, pos, end);
          pos = end;
          }
          }
          /**
          * MOVE is not supported in superclass implementation
          * and exportDone is implemented to do nothing - see api.
          */
          public void exportAsDrag(JComponent comp, InputEvent e, int action) {
          super.exportAsDrag(comp, e, action);
          Clipboard clip = comp.getToolkit().getSystemClipboard();
          exportDone(comp, clip, action);
          }
          /**
          * MOVE is not supported in superclass implementation
          * and exportDone is implemented to do nothing - see api.
          */
          public void exportToClipboard(JComponent comp, Clipboard clip, int action) {
          super.exportToClipboard(comp, clip, action);
          exportDone(comp, clip, action);
          }
          public void exportDone(JComponent comp, Clipboard clip, int action) {
          txt = (UndoableTextArea)comp;
          if(action == MOVE) {
          int offset = txt.getSelectionStart();
          int length = txt.getSelectionEnd() - offset;
          StyledDocument doc = txt.getStyledDocument();
          try {
          doc.remove(offset, length);
          } catch(BadLocationException e) {
          System.out.printf("BadLocation error: %s%n", e.getMessage());
          }
          }
          }
          public int getSourceActions(JComponent c) {
          return COPY_OR_MOVE;
          }
          public boolean importData(JComponent comp, Transferable t) {
          if(canImport(comp, t.getTransferDataFlavors())) {
          StyledString styledStr = null;
          try {
          styledStr = (StyledString)t.getTransferData(styledStringFlavor);
          List<AttributeSet> attrs = styledStr.attrs;
          List<Location> locs = styledStr.locs;
          JTextPane textPane = (JTextPane)comp;
          int pos = textPane.getCaretPosition();
          StyledDocument doc = textPane.getStyledDocument();
          Style logicalStyle = styledStr.logicalStyle;
          // Insert the text.
          try {
          doc.insertString(pos, styledStr.text, logicalStyle);
          } catch(BadLocationException e) {
          System.out.printf("BadLocation error: %s%n", e.getMessage());
          }
          // Appy the style runs to the inserted text.
          for(int j = 0; j < attrs.size(); j++) {
          AttributeSet as = attrs.get(j);
          Location loc = locs.get(j);
          doc.setCharacterAttributes(pos, loc.length, as, false);
          pos += loc.length;
          }
          return true;
          } catch(UnsupportedFlavorException ufe) {
          System.out.println("importData UnsupportedFlavor: " +
          ufe.getMessage());
          } catch(IOException ioe) {
          System.out.println("importData IO Error: " + ioe.getMessage());
          }
          }
          return false;
          }
          class StyledStringTransferable implements Transferable {
          private StyledString styledString;
          StyledStringTransferable(StyledString ss) {
          styledString = ss;
          }
          public Object getTransferData(DataFlavor flavor)
          throws UnsupportedFlavorException {
          if(!isDataFlavorSupported(flavor))
          throw new UnsupportedFlavorException(flavor);
          return styledString;
          }
          public DataFlavor[] getTransferDataFlavors() {
          return new DataFlavor[] { styledStringFlavor };
          }
          public boolean isDataFlavorSupported(DataFlavor flavor) {
          return styledStringFlavor.equals(flavor);
          }
          public String toString() {
          return "StyledStringTransferable: " + styledString;
          }
          }
          }
          class StyledString {
          String text;
          List<AttributeSet> attrs;
          List<Location> locs;
          Style logicalStyle;
          public StyledString(String text) {
          this.text = text;
          attrs = new ArrayList<AttributeSet>();
          locs = new ArrayList<Location>();
          }
          public void addAttributes(AttributeSet atts, int start, int end) {
          attrs.add(atts);
          locs.add(new Location(start, end));
          }
          public String toString() {
          StringBuilder sb = new StringBuilder("StyledString[");
          for(int j = 0; j < attrs.size(); j++) {
          sb.append("Attributes[");
          Enumeration e = attrs.get(j).getAttributeNames();
          while(e.hasMoreElements()) {
          Object key = e.nextElement();
          Object value = attrs.get(j).getAttribute(key);
          sb.append("key:" + key + ",value:" + value + ";");
          }
          sb.append("]");
          sb.append(" for " + locs.get(j));
          if(j < attrs.size()-1)
          sb.append("\n");
          }
          return sb.toString();
          }
          }
          class Location {
          int start;
          int length;
          public Location(int start, int end) {
          this.start = start;
          length = end - start;
          }
          public String toString() {
          return "Location[start:" + start + ",length:" + length + "]";
          }
          }
    Any help is appreciated.Thanks a lot in advance.
    Last edited by helloworld922; July 4th, 2011 at 12:23 PM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Unable to Drop the Text.

    Please edit your posted code and wrap it in code tags. Unformatted code is too hard to read.
    See: BB Code List - Java Forums
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