LogPane.java

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package org.libcsdbg.jtracer;

import java.awt.Font;
import java.awt.Color;
import java.awt.Insets;
import java.awt.EventQueue;

import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.text.Style;
import javax.swing.text.StyleContext;
import javax.swing.text.StyleConstants;
import javax.swing.text.Document;

public class LogPane extends JTextPane
{
  private static final long serialVersionUID = 0x00;


  LogPane()
  {
    StyleContext sc = StyleContext.getDefaultStyleContext();
    Style s = addStyle("debug", sc.getStyle(StyleContext.DEFAULT_STYLE));
    Registry conf = Registry.getCurrent();

    /* Create paragraph style attributes */
    Integer padding = (Integer) conf.get("text", "padding");
    if (padding != null) {
      StyleConstants.setLeftIndent(s, padding);
      StyleConstants.setRightIndent(s, padding);
    }

    Float spacing = (Float) conf.get("text", "line-height");
    if (spacing != null)
      StyleConstants.setLineSpacing(s, spacing);

    StyleConstants.setAlignment(s, StyleConstants.ALIGN_JUSTIFIED);
    setParagraphAttributes(s, true);

    /* Setup the default (debug) style */
    Font fnt = (Font) conf.get("text", "font");
    if (fnt != null) {
      StyleConstants.setFontFamily(s, fnt.getFamily());
      StyleConstants.setFontSize(s, fnt.getSize());
      StyleConstants.setBold(s, fnt.isBold());
      StyleConstants.setItalic(s, fnt.isItalic());
    }

    Color fg = (Color) conf.get("text", "fgcolor-debug");
    StyleConstants.setForeground(s, fg);

    /* Based on the default style create a style for each type of message */
    s = addStyle("status", s);
    fg = (Color) conf.get("text", "fgcolor-status");
    StyleConstants.setForeground(s, fg);

    s = addStyle("data", s);
    fg = (Color) conf.get("text", "fgcolor-data");
    StyleConstants.setForeground(s, fg);

    s = addStyle("alert", s);
    fg = (Color) conf.get("text", "fgcolor-alert");
    StyleConstants.setForeground(s, fg);

    s = addStyle("error", s);
    fg = (Color) conf.get("text", "fgcolor-error");
    StyleConstants.setForeground(s, fg);

    /* Set selection colors */
    Color bg = (Color) conf.get("text", "bgcolor-selection");
    fg = (Color) conf.get("text", "fgcolor-selection");
    setSelectionColor(bg);
    setSelectedTextColor(fg);

    setMargin((Insets) conf.get("text", "margin"));
    setEditable(false);
    setAutoscrolls(true);
  }


  public void append(final String ln, final String tag)
  {
    /* If the rendering is done by the event dispatching thread */
    if (EventQueue.isDispatchThread()) {
      try {
        Document doc = getDocument();
        int len = doc.getLength();
        doc.insertString(len, ln, getStyle(tag));
        setCaretPosition(len + ln.length());
      }

      catch (Throwable t) {
        Registry.debug(t);
      }

      return;
    }

    /*
     * If the rendering is done from any other thread, create a Worker task and
     * register it to be called by the event dispatching thread
     */
    class Worker implements Runnable {
      public void run()
      {
        /* The task is to recursively call the same method */
        append(ln, tag);
      }
    }

    try {
      SwingUtilities.invokeLater(new Worker());
    }

    catch (Throwable t) {
      Registry.debug(t);
    }
  }


  public void appendln(String ln, String tag)
  {
    append(ln + "\n", tag);
  }


  public void clear()
  {
    try {
      Document doc = getDocument();
      doc.remove(0, doc.getLength());
      setCaretPosition(0);
    }

    catch (Throwable t) {
      Registry.debug(t);
    }
  }
}