/*
* 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);
}