Examples of org.eclipse.swt.widgets.Tree

org.eclipse.swt.widgets.Tree
ipse.org/swt/snippets/#tree">Tree, TreeItem, TreeColumn snippets @see SWT Example: ControlExample @see Sample code and further information @noextend This class is not intended to be subclassed by clients.


      return null;
    }


    /* Item is Root-Leveld */
    Tree tree = fItem.getParent();
    int index = tree.indexOf(fItem);


    if (tree.getItemCount() > index + 1)
      return new WidgetTreeNode(tree.getItem(index + 1), fViewer);


    return null;
  }

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      });
    }
  }


  private void updateSelectionAfterDelete(Runnable runnable) {
    Tree tree = (Tree) getControl();
    IStructuredSelection selection = (IStructuredSelection) getSelection();


    /* Nothing to do, since no selection */
    if (selection.isEmpty()) {
      runnable.run();

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      return null;
    }


    /* Item is Root-Leveld */
    Tree tree = fItem.getParent();
    int index = tree.indexOf(fItem);


    if (index > 0)
      return new WidgetTreeNode(tree.getItem(index - 1), fViewer);


    return null;
  }

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   * <code>FALSE</code>.
   * @return Returns <code>TRUE</code> in case navigation found a valid item, or
   * <code>FALSE</code> otherwise.
   */
  public boolean navigate(boolean newsScoped, boolean next, boolean unread) {
    Tree explorerTree = fViewer.getTree();


    /* Nothing to Navigate to */
    if (explorerTree.isDisposed())
      return false;


    ITreeNode targetNode = null;


    /* 1.) Navigate in opened Tree */

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      else
        fCheckedElementsCache.remove(child);
    }


    private void cacheAll(boolean checked) {
      Tree tree = fViewer.getTree();
      cacheAll(tree.getItems(), checked);
    }

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        });
      }


      /* Tree */
      else if (c instanceof Tree) {
        Tree tree = (Tree) c;
        tree.addSelectionListener(new SelectionAdapter() {
          @Override
          public void widgetSelected(SelectionEvent e) {
            if ((e.detail & SWT.CHECK) != 0)
              run.run();
          }
        });


        tree.addDragDetectListener(new DragDetectListener() {
          public void dragDetected(DragDetectEvent e) {
            run.run();
          }
        });
      }

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                  SashForm form = (SashForm) children[1];
                  form.setWeights(new int[] { 70, 30 });


                  Control[] formChilds = form.getChildren();
                  if (formChilds.length != 0 && formChilds[0] instanceof Tree) {
                    Tree tree = (Tree) formChilds[0];
                    if (tree.getItemCount() != 0) {
                      TreeItem root = tree.getItem(0);
                      root.setExpanded(true);
                    }
                  }
                }
              }

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      }
    });
  }


  void updateSelectionAfterDelete(Runnable runnable) {
    Tree tree = getTree();
    TreeItem[] oldSelection = tree.getSelection();


    /* Nothing to do, since no selection */
    if (oldSelection.length == 0) {
      runnable.run();
      return;
    }


    /* Remember the actual selected Objects to determine if a selection needs to be restored */
    List<Object> oldSelectionObjects = new ArrayList<Object>(oldSelection.length);
    for (TreeItem item : oldSelection) {
      oldSelectionObjects.add(item.getData());
    }


    /* Check if Last Selected Item is an Entity Group */
    TreeItem lastSelectedItem = oldSelection[oldSelection.length - 1];
    if (lastSelectedItem.getData() instanceof EntityGroup) {


      /* Given this group gets deleted, use the next or previous entity group as input for the WidgetTreeNode below */
      int indexOfEntityGroup = tree.indexOf(lastSelectedItem);
      if (tree.getItemCount() > indexOfEntityGroup + 1) //Try Next
        lastSelectedItem = tree.getItem(indexOfEntityGroup + 1);
      else if (indexOfEntityGroup > 0) //Try Previous
        lastSelectedItem = tree.getItem(indexOfEntityGroup - 1);
    }


    /* Navigate to next News if possible */
    ITreeNode startingNode = new WidgetTreeNode(lastSelectedItem, this);
    ISelection newSelection = navigate(startingNode, true);

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  /**
   * Adjusts the scroll position to reflect the sorting.
   */
  public void adjustScrollPosition() {
    Tree tree = fViewer.getTree();
    int itemCount = tree.getItemCount();
    if (itemCount > 0) {
      if ((fNewsSorter.getSortBy() == NewsColumn.DATE || fNewsSorter.getSortBy() == NewsColumn.PUBLISHED || fNewsSorter.getSortBy() == NewsColumn.MODIFIED || fNewsSorter.getSortBy() == NewsColumn.RECEIVED) && fNewsSorter.isAscending()) {
        TreeItem item = tree.getItem(itemCount - 1);
        int childCount = item.getItemCount();
        if (childCount != 0)
          item = item.getItem(childCount - 1);
        tree.showItem(item);
      } else
        tree.setTopItem(tree.getItem(0));
    }
  }

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    else
      runnable.run();
  }


  private int indexOf(NewsColumn column) {
    Tree tree = fCustomTree.getControl();
    if (tree.isDisposed())
      return -1;


    TreeColumn[] columns = tree.getColumns();
    for (int i = 0; i < columns.length; i++) {
      if (column == columns[i].getData(NewsColumnViewModel.COL_ID))
        return i;
    }

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