private static void drawSelection(JTree tree, Graphics g, final int width) {
   int y = 0;
   final int[] rows = tree.getSelectionRows();
   final int height = tree.getRowHeight();
   for (int row : rows) {
     final TreeCellRenderer renderer = tree.getCellRenderer();
     final Object value = tree.getPathForRow(row).getLastPathComponent();
     if (value == null) continue;
     final Component component =
         renderer.getTreeCellRendererComponent(tree, value, false, false, false, row, false);
     if (component.getFont() == null) {
       component.setFont(tree.getFont());
     }
     g.translate(0, y);
     component.setBounds(0, 0, width, height);
     boolean wasOpaque = false;
     if (component instanceof JComponent) {
       final JComponent j = (JComponent) component;
       if (j.isOpaque()) wasOpaque = true;
       j.setOpaque(false);
     }
     component.paint(g);
     if (wasOpaque) {
       ((JComponent) component).setOpaque(true);
     }
     y += height;
     g.translate(0, -y);
   }
 }
Exemple #2
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 public static RelativePoint getPointForSelection(JTree aTree) {
   final int[] rows = aTree.getSelectionRows();
   if (rows == null || rows.length == 0) {
     return RelativePoint.getCenterOf(aTree);
   }
   return getPointForRow(aTree, rows[rows.length - 1]);
 }
  @NotNull
  @Override
  public RelativePoint guessBestPopupLocation(@NotNull final JComponent component) {
    Point popupMenuPoint = null;
    final Rectangle visibleRect = component.getVisibleRect();
    if (component instanceof JList) { // JList
      JList list = (JList) component;
      int firstVisibleIndex = list.getFirstVisibleIndex();
      int lastVisibleIndex = list.getLastVisibleIndex();
      int[] selectedIndices = list.getSelectedIndices();
      for (int index : selectedIndices) {
        if (firstVisibleIndex <= index && index <= lastVisibleIndex) {
          Rectangle cellBounds = list.getCellBounds(index, index);
          popupMenuPoint =
              new Point(visibleRect.x + visibleRect.width / 4, cellBounds.y + cellBounds.height);
          break;
        }
      }
    } else if (component instanceof JTree) { // JTree
      JTree tree = (JTree) component;
      int[] selectionRows = tree.getSelectionRows();
      if (selectionRows != null) {
        Arrays.sort(selectionRows);
        for (int i = 0; i < selectionRows.length; i++) {
          int row = selectionRows[i];
          Rectangle rowBounds = tree.getRowBounds(row);
          if (visibleRect.contains(rowBounds)) {
            popupMenuPoint = new Point(rowBounds.x + 2, rowBounds.y + rowBounds.height - 1);
            break;
          }
        }
        if (popupMenuPoint == null) { // All selected rows are out of visible rect
          Point visibleCenter =
              new Point(
                  visibleRect.x + visibleRect.width / 2, visibleRect.y + visibleRect.height / 2);
          double minDistance = Double.POSITIVE_INFINITY;
          int bestRow = -1;
          Point rowCenter;
          double distance;
          for (int i = 0; i < selectionRows.length; i++) {
            int row = selectionRows[i];
            Rectangle rowBounds = tree.getRowBounds(row);
            rowCenter =
                new Point(rowBounds.x + rowBounds.width / 2, rowBounds.y + rowBounds.height / 2);
            distance = visibleCenter.distance(rowCenter);
            if (minDistance > distance) {
              minDistance = distance;
              bestRow = row;
            }
          }

          if (bestRow != -1) {
            Rectangle rowBounds = tree.getRowBounds(bestRow);
            tree.scrollRectToVisible(
                new Rectangle(
                    rowBounds.x,
                    rowBounds.y,
                    Math.min(visibleRect.width, rowBounds.width),
                    rowBounds.height));
            popupMenuPoint = new Point(rowBounds.x + 2, rowBounds.y + rowBounds.height - 1);
          }
        }
      }
    } else if (component instanceof JTable) {
      JTable table = (JTable) component;
      int column = table.getColumnModel().getSelectionModel().getLeadSelectionIndex();
      int row =
          Math.max(
              table.getSelectionModel().getLeadSelectionIndex(),
              table.getSelectionModel().getAnchorSelectionIndex());
      Rectangle rect = table.getCellRect(row, column, false);
      if (!visibleRect.intersects(rect)) {
        table.scrollRectToVisible(rect);
      }
      popupMenuPoint = new Point(rect.x, rect.y + rect.height);
    } else if (component instanceof PopupOwner) {
      popupMenuPoint = ((PopupOwner) component).getBestPopupPosition();
    }
    if (popupMenuPoint == null) {
      popupMenuPoint =
          new Point(visibleRect.x + visibleRect.width / 2, visibleRect.y + visibleRect.height / 2);
    }

    return new RelativePoint(component, popupMenuPoint);
  }