示例#1
0
 // ------------------------------
 public void
     scrollToCaret() { // not called - fixed with putting visible scrollbars on JScrollPane
   //
   Rectangle rect1 = scroller1.getViewport().getViewRect();
   double x1 = rect1.getX();
   double y1 = rect1.getY();
   double r1height = rect1.getHeight();
   double r1width = rect1.getWidth();
   Caret caret1 = editor1.getCaret();
   Point pt2 = caret1.getMagicCaretPosition(); // the end of the string
   double x2 = pt2.getX();
   double y2 = pt2.getY();
   if (((x2 > x1) && (x2 < (x1 + r1width))) && ((y2 > y1) && (y2 < (y1 + r1height)))) {
     // inview
   } else {
     double newheight = r1height / 2;
     double newwidth = r1width / 2;
     double x3 = pt2.getX() - newwidth;
     double y3 = pt2.getY() - newheight;
     if (x3 < 0) x3 = 0;
     if (y3 < 0) y3 = 0;
     Rectangle rect3 = new Rectangle((int) x3, (int) y3, (int) newwidth, (int) newheight);
     editor1.scrollRectToVisible(rect3);
   }
 } // end scrollToCaret
示例#2
0
  /**
   * Provides a way to determine the next visually represented model location at which one might
   * place a caret. Some views may not be visible, they might not be in the same order found in the
   * model, or they just might not allow access to some of the locations in the model.
   *
   * @param pos the position to convert >= 0
   * @param a the allocated region in which to render
   * @param direction the direction from the current position that can be thought of as the arrow
   *     keys typically found on a keyboard. This will be one of the following values:
   *     <ul>
   *       <li>SwingConstants.WEST
   *       <li>SwingConstants.EAST
   *       <li>SwingConstants.NORTH
   *       <li>SwingConstants.SOUTH
   *     </ul>
   *
   * @return the location within the model that best represents the next location visual position
   * @exception BadLocationException
   * @exception IllegalArgumentException if <code>direction</code> doesn't have one of the legal
   *     values above
   */
  public int getNextVisualPositionFrom(
      int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)
      throws BadLocationException {

    biasRet[0] = Position.Bias.Forward;
    switch (direction) {
      case NORTH:
      case SOUTH:
        {
          if (pos == -1) {
            pos = (direction == NORTH) ? Math.max(0, getEndOffset() - 1) : getStartOffset();
            break;
          }
          JTextComponent target = (JTextComponent) getContainer();
          Caret c = (target != null) ? target.getCaret() : null;
          // YECK! Ideally, the x location from the magic caret position
          // would be passed in.
          Point mcp;
          if (c != null) {
            mcp = c.getMagicCaretPosition();
          } else {
            mcp = null;
          }
          int x;
          if (mcp == null) {
            Rectangle loc = target.modelToView(pos);
            x = (loc == null) ? 0 : loc.x;
          } else {
            x = mcp.x;
          }
          if (direction == NORTH) {
            pos = Utilities.getPositionAbove(target, pos, x);
          } else {
            pos = Utilities.getPositionBelow(target, pos, x);
          }
        }
        break;
      case WEST:
        if (pos == -1) {
          pos = Math.max(0, getEndOffset() - 1);
        } else {
          pos = Math.max(0, pos - 1);
        }
        break;
      case EAST:
        if (pos == -1) {
          pos = getStartOffset();
        } else {
          pos = Math.min(pos + 1, getDocument().getLength());
        }
        break;
      default:
        throw new IllegalArgumentException("Bad direction: " + direction);
    }
    return pos;
  }