Example usage for com.google.gwt.user.cellview.client TreeNode isDestroyed

Introduction

In this page you can find the example usage for com.google.gwt.user.cellview.client TreeNode isDestroyed.

Prototype

boolean isDestroyed();

Source Link

Document

Check whether or not the current node is destroyed.

Usage

From source file:org.rstudio.studio.client.workbench.views.connections.ui.ObjectBrowser.java

License:Open Source License

public void update(Connection connection, String hint) {
    final Set<DatabaseObject> expandedNodes = new HashSet<DatabaseObject>();

    // if this update is for the currently visible connection in the model,
    // cache the set of expanded nodes for replay
    if (objects_ != null && connection == connection_) {
        TreeNode rootNode = objects_.getRootTreeNode();
        if (!objects_.getRootTreeNode().isDestroyed()) {
            for (int i = 0; i < rootNode.getChildCount(); i++) {
                if (rootNode.isChildOpen(i)) {
                    DatabaseObject node = (DatabaseObject) rootNode.getChildValue(i);
                    expandedNodes.add(node);
                }/*w w  w  .ja  va 2s  .c  om*/
            }
        }
    }

    // create tables model and widget
    objectsModel_ = new ObjectBrowserModel();

    // capture scroll position
    final int scrollPosition = scrollPanel_.getVerticalScrollPosition();

    // update the table then restore expanded nodes
    objectsModel_.update(connection, // connection 
            expandedNodes, new Command() { // table update completed, expand nodes
                @Override
                public void execute() {
                    TreeNode rootNode = objects_.getRootTreeNode();
                    if (!rootNode.isDestroyed()) {
                        for (int i = 0; i < rootNode.getChildCount(); i++) {
                            final DatabaseObject nodeVal = (DatabaseObject) (rootNode.getChildValue(i));
                            for (DatabaseObject expanded : expandedNodes) {
                                if (expanded.isEqualTo(nodeVal))
                                    rootNode.setChildOpen(i, true, false);
                            }
                        }
                    }
                }
            }, new Command() { // node expansion completed, restore scroll position
                @Override
                public void execute() {
                    // delay 100ms to allow expand animation to complete
                    new Timer() {

                        @Override
                        public void run() {
                            scrollPanel_.setVerticalScrollPosition(scrollPosition);
                        }

                    }.schedule(100);

                }
            });

    // create new widget
    objects_ = new CellTree(objectsModel_, null, RES, MESSAGES);

    // create the top level list of objects
    objects_.setDefaultNodeSize(Integer.MAX_VALUE);
    objects_.getElement().getStyle().setBorderStyle(BorderStyle.NONE);
    objects_.setWidth("100%");

    // wrap in vertical panel to get correct scrollbar behavior
    VerticalPanel verticalWrapper = new VerticalPanel();
    verticalWrapper.setWidth("100%");
    verticalWrapper.add(objects_);

    scrollPanel_.setWidget(verticalWrapper);

    // cache connection
    connection_ = connection;
}

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