示例#1
0
 /**
  * Update the visibility model with the associated JTextField (if there is one) to reflect the
  * current visibility as a result of changes to the document model. The bounded range properties
  * are updated. If the view hasn't yet been shown the extent will be zero and we just set it to be
  * full until determined otherwise.
  */
 void updateVisibilityModel() {
   Component c = getContainer();
   if (c instanceof JTextField) {
     JTextField field = (JTextField) c;
     BoundedRangeModel vis = field.getHorizontalVisibility();
     int hspan = (int) getPreferredSpan(X_AXIS);
     int extent = vis.getExtent();
     int maximum = Math.max(hspan, extent);
     extent = (extent == 0) ? maximum : extent;
     int value = maximum - extent;
     int oldValue = vis.getValue();
     if ((oldValue + extent) > maximum) {
       oldValue = maximum - extent;
     }
     value = Math.max(0, Math.min(value, oldValue));
     vis.setRangeProperties(value, extent, 0, maximum, false);
   }
 }
示例#2
0
  /**
   * Adjusts the allocation given to the view to be a suitable allocation for a text field. If the
   * view has been allocated more than the preferred span vertically, the allocation is changed to
   * be centered vertically. Horizontally the view is adjusted according to the horizontal alignment
   * property set on the associated JTextField (if that is the type of the hosting component).
   *
   * @param a the allocation given to the view, which may need to be adjusted.
   * @return the allocation that the superclass should use.
   */
  protected Shape adjustAllocation(Shape a) {
    if (a != null) {
      Rectangle bounds = a.getBounds();
      int vspan = (int) getPreferredSpan(Y_AXIS);
      int hspan = (int) getPreferredSpan(X_AXIS);
      if (bounds.height != vspan) {
        int slop = bounds.height - vspan;
        bounds.y += slop / 2;
        bounds.height -= slop;
      }

      // horizontal adjustments
      Component c = getContainer();
      if (c instanceof JTextField) {
        JTextField field = (JTextField) c;
        BoundedRangeModel vis = field.getHorizontalVisibility();
        int max = Math.max(hspan, bounds.width);
        int value = vis.getValue();
        int extent = Math.min(max, bounds.width - 1);
        if ((value + extent) > max) {
          value = max - extent;
        }
        vis.setRangeProperties(value, extent, vis.getMinimum(), max, false);
        if (hspan < bounds.width) {
          // horizontally align the interior
          int slop = bounds.width - 1 - hspan;

          int align = ((JTextField) c).getHorizontalAlignment();
          if (Utilities.isLeftToRight(c)) {
            if (align == LEADING) {
              align = LEFT;
            } else if (align == TRAILING) {
              align = RIGHT;
            }
          } else {
            if (align == LEADING) {
              align = RIGHT;
            } else if (align == TRAILING) {
              align = LEFT;
            }
          }

          switch (align) {
            case SwingConstants.CENTER:
              bounds.x += slop / 2;
              bounds.width -= slop;
              break;
            case SwingConstants.RIGHT:
              bounds.x += slop;
              bounds.width -= slop;
              break;
          }
        } else {
          // adjust the allocation to match the bounded range.
          bounds.width = hspan;
          bounds.x -= vis.getValue();
        }
      }
      return bounds;
    }
    return null;
  }