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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.client.ui;
import java.util.HashMap;
import java.util.Map;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.ContextMenuEvent;
import com.google.gwt.event.dom.client.ContextMenuHandler;
import com.google.gwt.event.dom.client.DomEvent;
import com.google.gwt.event.dom.client.DoubleClickEvent;
import com.google.gwt.event.dom.client.DoubleClickHandler;
import com.google.gwt.event.dom.client.MouseUpEvent;
import com.google.gwt.event.dom.client.MouseUpHandler;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Element;
import com.vaadin.terminal.gwt.client.ApplicationConnection;
import com.vaadin.terminal.gwt.client.ComponentConnector;
import com.vaadin.terminal.gwt.client.MouseEventDetails;
import com.vaadin.terminal.gwt.client.MouseEventDetailsBuilder;
public abstract class ClickEventHandler implements DoubleClickHandler,
ContextMenuHandler, MouseUpHandler {
private HandlerRegistration doubleClickHandlerRegistration;
private HandlerRegistration mouseUpHandlerRegistration;
private HandlerRegistration contextMenuHandlerRegistration;
protected String clickEventIdentifier;
protected ComponentConnector connector;
public ClickEventHandler(ComponentConnector connector,
String clickEventIdentifier) {
this.connector = connector;
this.clickEventIdentifier = clickEventIdentifier;
}
public void handleEventHandlerRegistration() {
// Handle registering/unregistering of click handler depending on if
// server side listeners have been added or removed.
if (hasEventListener()) {
if (mouseUpHandlerRegistration == null) {
mouseUpHandlerRegistration = registerHandler(this,
MouseUpEvent.getType());
contextMenuHandlerRegistration = registerHandler(this,
ContextMenuEvent.getType());
doubleClickHandlerRegistration = registerHandler(this,
DoubleClickEvent.getType());
}
} else {
if (mouseUpHandlerRegistration != null) {
// Remove existing handlers
doubleClickHandlerRegistration.removeHandler();
mouseUpHandlerRegistration.removeHandler();
contextMenuHandlerRegistration.removeHandler();
contextMenuHandlerRegistration = null;
mouseUpHandlerRegistration = null;
doubleClickHandlerRegistration = null;
}
}
}
protected abstract <H extends EventHandler> HandlerRegistration registerHandler(
final H handler, DomEvent.Type<H> type);
protected ApplicationConnection getApplicationConnection() {
return connector.getConnection();
}
public boolean hasEventListener() {
return connector.hasEventListener(clickEventIdentifier);
}
protected void fireClick(NativeEvent event) {
String pid = connector.getConnectorId();
MouseEventDetails mouseDetails = MouseEventDetailsBuilder
.buildMouseEventDetails(event, getRelativeToElement());
Map<String, Object> parameters = new HashMap<String, Object>();
parameters.put("mouseDetails", mouseDetails.serialize());
connector.getConnection().updateVariable(pid, clickEventIdentifier,
parameters, true);
}
public void onContextMenu(ContextMenuEvent event) {
if (hasEventListener()) {
// Prevent showing the browser's context menu when there is a right
// click listener.
event.preventDefault();
}
}
public void onMouseUp(MouseUpEvent event) {
// TODO For perfect accuracy we should check that a mousedown has
// occured on this element before this mouseup and that no mouseup
// has occured anywhere after that.
if (hasEventListener()) {
// "Click" with left, right or middle button
fireClick(event.getNativeEvent());
}
}
public void onDoubleClick(DoubleClickEvent event) {
if (hasEventListener()) {
fireClick(event.getNativeEvent());
}
}
/**
* Click event calculates and returns coordinates relative to the element
* returned by this method. Default implementation uses the root element of
* the widget. Override to provide a different relative element.
*
* @return The Element used for calculating relative coordinates for a click
* or null if no relative coordinates can be calculated.
*/
protected Element getRelativeToElement() {
return connector.getWidget().getElement();
}
}
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