DefaultStyledDocument

Java Swing class JTextPane is used for the core operation of VTT.

• Scrollable:
  JTextPane is added to JScollPane for scrollability
  The hierarchy of GUI objects is:
  • MainFrame (JFrame)
    • MainPanel (JPanel)
      • scrollPane (JScrollPane)
        • textPane_ (JTextPane)
          • setEditable(false)
          • setCaretPosition(int)

          • setSelectionStart(int)
          • setSelectionEnd(int)
          • setSelectedTextColor(color)
          • setSelectionColor(color)

          • print()

          • (DefaultStyledDocument) doc (StyledDocument)
            • set style change in doc
• Controller (listeners):
  MouseListener and CaretListener are added in JTextPane for mouse control and caret control.
• StyledDocument
  JTextPane.getStyledDocument( ) is used for core operations of changing color, style, size, font, etc.. The sample code is implemented in VttDocument.java as follows:

  // get doc
  DefaultStyledDocument doc
  	= (DefaultStyledDocument) JTextPane.getStyledDocument( );
  
  // set SimpleAttibuteSet by StyleConstants
  SimpleAttributeSet sas = new SimpleAttributeSet();
  StyleConstants.setBold(sas, tag.IsBold());
  StyleConstants.setItalic(sas, tag.IsItalic());
  StyleConstants.setUnderline(sas, tag.IsUnderline());
  
  StyleConstants.setForeground(sas, TEXT_COLOR);
  StyleConstants.setBackground(sas, TEXT_BG_COLOR);
  
  StyleConstants.setFontFamily(sas, tag.GetFontFamily());
  StyleConstants.setFontSize(sas, tag.GetFontSize());
  
  // init/load doc
  doc.remove(0, doc.getLength());
  doc.insertString(doc.getLength(), tagDocument.GetText(), sas);
  
  // set style to doc
  doc.setCharacterAttributes(offset, length, sas, false);