예제 #1
0
  /**
   * Converts an offset in a line into an x co-ordinate. This is a fast version that should only be
   * used if no changes were made to the text since the last repaint.
   *
   * @param line The line
   * @param offset The offset, from the start of the line
   */
  public int _offsetToX(int line, int offset) {
    TokenMarker tokenMarker = getTokenMarker();

    /* Use painter's cached info for speed */
    FontMetrics fm = painter.getFontMetrics();

    getLineText(line, lineSegment);

    int segmentOffset = lineSegment.offset;
    int x = horizontalOffset;

    /* If syntax coloring is disabled, do simple translation */
    if (tokenMarker == null) {
      lineSegment.count = offset;
      return x + Utilities.getTabbedTextWidth(lineSegment, fm, x, painter, 0);
    }
    /* If syntax coloring is enabled, we have to do this because
     * tokens can vary in width */
    else {
      Token tokens;
      if (painter.currentLineIndex == line && painter.currentLineTokens != null)
        tokens = painter.currentLineTokens;
      else {
        painter.currentLineIndex = line;
        tokens = painter.currentLineTokens = tokenMarker.markTokens(lineSegment, line);
      }

      Toolkit toolkit = painter.getToolkit();
      Font defaultFont = painter.getFont();
      SyntaxStyle[] styles = painter.getStyles();

      for (; ; ) {
        byte id = tokens.id;
        if (id == Token.END) {
          return x;
        }

        if (id == Token.NULL) fm = painter.getFontMetrics();
        else fm = styles[id].getFontMetrics(defaultFont);

        int length = tokens.length;

        if (offset + segmentOffset < lineSegment.offset + length) {
          lineSegment.count = offset - (lineSegment.offset - segmentOffset);
          return x + Utilities.getTabbedTextWidth(lineSegment, fm, x, painter, 0);
        } else {
          lineSegment.count = length;
          x += Utilities.getTabbedTextWidth(lineSegment, fm, x, painter, 0);
          lineSegment.offset += length;
        }
        tokens = tokens.next;
      }
    }
  }
예제 #2
0
 /**
  * Determines the preferred span for this view along an axis.
  *
  * @param axis may be either View.X_AXIS or View.Y_AXIS
  * @return the span the view would like to be rendered into &gt;= 0. Typically the view is told to
  *     render into the span that is returned, although there is no guarantee. The parent may
  *     choose to resize or break the view.
  */
 public float getPreferredSpan(int axis) {
   switch (axis) {
     case View.X_AXIS:
       Segment buff = SegmentCache.getSharedSegment();
       Document doc = getDocument();
       int width;
       try {
         FontMetrics fm = getFontMetrics();
         doc.getText(0, doc.getLength(), buff);
         width = Utilities.getTabbedTextWidth(buff, fm, 0, this, 0);
         if (buff.count > 0) {
           Component c = getContainer();
           firstLineOffset =
               sun.swing.SwingUtilities2.getLeftSideBearing(
                   (c instanceof JComponent) ? (JComponent) c : null, fm, buff.array[buff.offset]);
           firstLineOffset = Math.max(0, -firstLineOffset);
         } else {
           firstLineOffset = 0;
         }
       } catch (BadLocationException bl) {
         width = 0;
       }
       SegmentCache.releaseSharedSegment(buff);
       return width + firstLineOffset;
     default:
       return super.getPreferredSpan(axis);
   }
 }