Canvas.java

package com.google.gwt.nextgen.canvas.client;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasAllMouseHandlers;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseMoveHandler;
import com.google.gwt.event.dom.client.MouseOutEvent;
import com.google.gwt.event.dom.client.MouseOutHandler;
import com.google.gwt.event.dom.client.MouseOverEvent;
import com.google.gwt.event.dom.client.MouseOverHandler;
import com.google.gwt.event.dom.client.MouseUpEvent;
import com.google.gwt.event.dom.client.MouseUpHandler;
import com.google.gwt.event.dom.client.MouseWheelEvent;
import com.google.gwt.event.dom.client.MouseWheelHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.Widget;

public class Canvas extends Widget implements HasAllMouseHandlers,
    HasClickHandlers {

  public Canvas() {
    setElement(CanvasElement.create());
  }

  public Canvas(int width, int height) {
    setElement(CanvasElement.create());
    setWidth(getElement(), width);
    setHeight(getElement(), height);
  }

  public void setWidth(int width) {
    setWidth(getElement(), width);
  }
  
  public void setHeight(int height) {
    setHeight(getElement(), height);
  }
  
  private native void setWidth(Element e, int width) /*-{
    e.width = width;
  }-*/;

  private native void setHeight(Element e, int height) /*-{
    e.height = height;
  }-*/;

  public CanvasElement getElement() {
    return super.getElement().<CanvasElement> cast();
  }

  public Canvas2D get2DContext() {
    return getElement().get2DContext();
  }

  public int getWidth() {
    return getElement().getOffsetWidth();
  }

  public int getHeight() {
    return getElement().getOffsetWidth();
  }

  @Override
  public HandlerRegistration addMouseDownHandler(MouseDownHandler handler) {
    return addDomHandler(handler, MouseDownEvent.getType());
  }

  @Override
  public HandlerRegistration addMouseUpHandler(MouseUpHandler handler) {
    return addDomHandler(handler, MouseUpEvent.getType());
  }

  @Override
  public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) {
    return addDomHandler(handler, MouseOutEvent.getType());
  }

  @Override
  public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) {
    return addDomHandler(handler, MouseOverEvent.getType());
  }

  @Override
  public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler) {
    return addDomHandler(handler, MouseMoveEvent.getType());
  }

  @Override
  public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler) {
    return addDomHandler(handler, MouseWheelEvent.getType());
  }

  @Override
  public HandlerRegistration addClickHandler(ClickHandler handler) {
    return addDomHandler(handler, ClickEvent.getType());
  }
}