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package com.itmill.toolkit.demo.sampler;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Map;
import com.itmill.toolkit.terminal.PaintException;
import com.itmill.toolkit.terminal.PaintTarget;
import com.itmill.toolkit.terminal.Resource;
import com.itmill.toolkit.ui.Component;
import com.itmill.toolkit.ui.Link;
import com.itmill.toolkit.ui.Button.ClickEvent;
import com.itmill.toolkit.ui.Button.ClickListener;
@SuppressWarnings("serial")
public class ActiveLink extends Link {
private static final String TAG = "activelink";
private static final Method LINK_FOLLOWED_METHOD;
private HashSet listeners = new HashSet();
public ActiveLink() {
super();
}
public ActiveLink(String caption, Resource resource, String targetName,
int width, int height, int border) {
super(caption, resource, targetName, width, height, border);
}
public ActiveLink(String caption, Resource resource) {
super(caption, resource);
}
@Override
public String getTag() {
return TAG;
}
static {
try {
LINK_FOLLOWED_METHOD = LinkActivatedListener.class
.getDeclaredMethod("linkActivated",
new Class[] { LinkActivatedEvent.class });
} catch (final java.lang.NoSuchMethodException e) {
// This should never happen
throw new java.lang.RuntimeException(
"Internal error finding methods in ActiveLink");
}
}
/**
* Adds the link activated listener.
*
* @param listener
* the Listener to be added.
*/
public void addListener(LinkActivatedListener listener) {
listeners.add(listener);
addListener(LinkActivatedEvent.class, listener, LINK_FOLLOWED_METHOD);
if (listeners.size() == 1) {
requestRepaint();
}
}
/**
* Removes the link activated listener.
*
* @param listener
* the Listener to be removed.
*/
public void removeListener(ClickListener listener) {
listeners.remove(listener);
removeListener(ClickEvent.class, listener, LINK_FOLLOWED_METHOD);
if (listeners.size() == 0) {
requestRepaint();
}
}
/**
* Emits the options change event.
*/
protected void fireClick(boolean linkOpened) {
fireEvent(new LinkActivatedEvent(this, linkOpened));
}
@Override
public void paintContent(PaintTarget target) throws PaintException {
super.paintContent(target);
if (listeners.size() > 0) {
target.addVariable(this, "activated", false);
target.addVariable(this, "opened", false);
}
}
@Override
public void changeVariables(Object source, Map variables) {
super.changeVariables(source, variables);
if (!isReadOnly() && variables.containsKey("activated")) {
final Boolean activated = (Boolean) variables.get("activated");
final Boolean opened = (Boolean) variables.get("opened");
if (activated != null && activated.booleanValue() && !isReadOnly()) {
fireClick((opened != null && opened.booleanValue() ? true
: false));
}
}
}
public class LinkActivatedEvent extends Component.Event {
private boolean linkOpened;
/**
* New instance of text change event.
*
* @param source
* the Source of the event.
*/
public LinkActivatedEvent(Component source, boolean linkOpened) {
super(source);
this.linkOpened = linkOpened;
}
/**
* Gets the ActiveLink where the event occurred.
*
* @return the Source of the event.
*/
public ActiveLink getActiveLink() {
return (ActiveLink) getSource();
}
/**
* Indicates whether or not the link was opened on the client, i.e in a
* new window/tab. If the link was not opened, the listener should react
* to the event and "do something", otherwise the link does nothing.
*
* @return true if the link was opened on the client
*/
public boolean isLinkOpened() {
return linkOpened;
}
}
/**
* ActiveLink click listener
*/
public interface LinkActivatedListener extends Serializable {
/**
* ActiveLink has been activated.
*
* @param event
* ActiveLink click event.
*/
public void linkActivated(LinkActivatedEvent event);
}
}
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