org.rstudio.studio.client.workbench.views.plots.Locator.java Source code

Introduction

Here is the source code for org.rstudio.studio.client.workbench.views.plots.Locator.java

Source

/*
 * Locator.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */
package org.rstudio.studio.client.workbench.views.plots;

import com.google.gwt.event.logical.shared.HasSelectionHandlers;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import org.rstudio.core.client.Point;
import org.rstudio.core.client.Size;

public class Locator implements HasSelectionHandlers<Point> {
    public interface Display extends HasSelectionHandlers<Point> {
        void showLocator(Plots.Parent parent);

        void hideLocator();

        boolean isVisible();
    }

    public Locator(Plots.Parent parent) {
        parent_ = parent;
    }

    public HandlerRegistration addSelectionHandler(SelectionHandler<Point> handler) {
        return handlers_.addHandler(SelectionEvent.getType(), handler);
    }

    public void fireEvent(GwtEvent<?> event) {
        handlers_.fireEvent(event);
    }

    public boolean isActive() {
        return display_ != null;
    }

    public void locate(String url, Size size) {
        if (currentUrl_ == null || !currentUrl_.equals(url) || currentSize_ == null || !currentSize_.equals(size)
                || display_ == null || !display_.isVisible()) {
            clearDisplay();

            display_ = new LocatorPanel();
            hreg_ = display_.addSelectionHandler(new SelectionHandler<Point>() {
                public void onSelection(SelectionEvent<Point> event) {
                    SelectionEvent.fire(Locator.this, event.getSelectedItem());
                }
            });
            currentUrl_ = url;
            currentSize_ = size;
            display_.showLocator(parent_);
        }
    }

    public void clearDisplay() {
        currentUrl_ = null;
        currentSize_ = null;

        if (display_ != null) {
            display_.hideLocator();
            display_ = null;
        }

        if (hreg_ != null) {
            hreg_.removeHandler();
            hreg_ = null;
        }
    }

    private HandlerRegistration hreg_;
    private Display display_;
    private Plots.Parent parent_;
    private String currentUrl_;
    private Size currentSize_;
    private final HandlerManager handlers_ = new HandlerManager(null);
}