/**
* Sencha GXT 3.1.0-beta - Sencha for GWT
* Copyright(c) 2007-2014, Sencha, Inc.
* licensing@sencha.com
*
* http://www.sencha.com/products/gxt/license/
*/
package com.sencha.gxt.dnd.core.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.sencha.gxt.core.client.dom.XDOM;
import com.sencha.gxt.widget.core.client.Component;
/**
* A custom widget used to display the status of the drag operation and
* information about the data being dragged. The widget is displayed next to the
* cursor as the user drags data.
*/
public class StatusProxy extends Component {
public interface StatusProxyAppearance {
void render(SafeHtmlBuilder builder);
void setStatus(Element parent, boolean allowed);
void setStatus(Element parent, ImageResource icon);
void update(Element parent, String html);
}
private static final StatusProxy instance = GWT.create(StatusProxy.class);
/**
* Returns the singleton instance.
*
* @return the status proxy
*/
public static StatusProxy get() {
return instance;
}
private boolean status;
private final StatusProxyAppearance appearance;
protected StatusProxy() {
this(GWT.<StatusProxyAppearance> create(StatusProxyAppearance.class));
}
protected StatusProxy(StatusProxyAppearance appearance) {
this.appearance = appearance;
SafeHtmlBuilder builder = new SafeHtmlBuilder();
appearance.render(builder);
setElement((Element) XDOM.create(builder.toSafeHtml()));
setStatus(false);
setShadow(true);
}
public StatusProxyAppearance getAppearance() {
return appearance;
}
/**
* Returns true if the drop is allowed.
*
* @return the status
*/
public boolean getStatus() {
return status;
}
/**
* Updates the proxy's visual element to indicate the status of whether or not
* drop is allowed over the current target element.
*
* @param allowed true for the standard ok icon, false for standard no icon
*/
public void setStatus(boolean allowed) {
appearance.setStatus(getElement(), allowed);
this.status = allowed;
}
/**
* Updates the proxy's visual element to indicate the status of whether or not
* drop is allowed over the current target element.
*
* @param allowed drop is allowed
* @param icon icon to display
*/
public void setStatus(boolean allowed, ImageResource icon) {
appearance.setStatus(getElement(), icon);
this.status = allowed;
}
/**
* Updates the contents of the ghost element.
*
* @param html the html that will replace the current contents of the ghost
* element
*/
public void update(SafeHtml html) {
update(html.asString());
}
/**
* Updates the contents of the ghost element.
*
* @param html the html that will replace the current contents of the ghost
* element
*/
public void update(String html) {
appearance.update(getElement(), html);
}
}