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用過gwt的都知道，對一個按鈕button做點擊事件很簡單，但要做鼠標事件，比如over，up，leave就沒辦法了，但extends Button就能做到，以下就是這個例子：我自己寫的
package?mypack.client;
import?com.google.gwt.core.client.EntryPoint;
import?com.google.gwt.user.client.DOM;
import?com.google.gwt.user.client.Event;
import?com.google.gwt.user.client.ui.Button;
import?com.google.gwt.user.client.ui.ClickListener;
import?com.google.gwt.user.client.ui.ClickListenerCollection;
import?com.google.gwt.user.client.ui.Label;
import?com.google.gwt.user.client.ui.LoadListener;
import?com.google.gwt.user.client.ui.LoadListenerCollection;
import?com.google.gwt.user.client.ui.MouseListener;
import?com.google.gwt.user.client.ui.MouseListenerCollection;
import?com.google.gwt.user.client.ui.RootPanel;
import?com.google.gwt.user.client.ui.SourcesClickEvents;
import?com.google.gwt.user.client.ui.SourcesLoadEvents;
import?com.google.gwt.user.client.ui.SourcesMouseEvents;
import?com.google.gwt.user.client.ui.Widget;
/**?*//**
?*?Entry?point?classes?define?<code>onModuleLoad()</code>.
?*/
public?class?MouseTest implements?EntryPoint?
{
????/**?*//**
?????*?This?is?the?entry?point?method.
?????*/
????public?void?onModuleLoad()?{
????????final?MyButton?button?=?new?MyButton("Super?Button");
????????final?Label?label?=?new?Label();
????????button.addMouseListener(new?MouseListener()?{
????????????public?void?onMouseDown(Widget?sender,?int?x,?int?y)?{
????????????????//?TODO?Auto-generated?method?stub
????????????}
????????????public?void?onMouseEnter(Widget?sender)?{
????????????????//?TODO?Auto-generated?method?stub
????????????}
????????????public?void?onMouseLeave(Widget?sender)?{
????????????????//?TODO?Auto-generated?method?stub
????????????}
????????????public?void?onMouseMove(Widget?sender,?int?x,?int?y)?{
????????????????label.setText("Hello?World!");
????????????}
????????????public?void?onMouseUp(Widget?sender,?int?x,?int?y)?{
????????????}
????????});
????????//?Assume?that?the?host?HTML?has?elements?defined?whose
????????//?IDs?are?"slot1",?"slot2".?In?a?real?app,?you?probably?would?not?want
????????//?to?hard-code?IDs.?Instead,?you?could,?for?example,?search?for?all
????????//?elements?with?a?particular?CSS?class?and?replace?them?with?widgets.
????????//
????????RootPanel.get("slot1").add(button);
????????RootPanel.get("slot2").add(label);
????}
}
class?MyButton?extends?Button?implements?SourcesClickEvents,
????????SourcesMouseEvents,?SourcesLoadEvents?{
????public?MyButton(String?text){
????????super(text);
????????sinkEvents(Event.ONCLICK?|?Event.MOUSEEVENTS?|?Event.ONLOAD?|?Event.ONERROR);
????}
????
????private?ClickListenerCollection?clickListeners;
????private?LoadListenerCollection?loadListeners;
????private?MouseListenerCollection?mouseListeners;
????public?void?addClickListener(ClickListener?listener)?{
????????if?(clickListeners?==?null)
????????????clickListeners?=?new?ClickListenerCollection();
????????clickListeners.add(listener);
????}
????public?void?addLoadListener(LoadListener?listener)?{
????????if?(loadListeners?==?null)
????????????loadListeners?=?new?LoadListenerCollection();
????????loadListeners.add(listener);
????}
????public?void?addMouseListener(MouseListener?listener)?{
????????if?(mouseListeners?==?null)
????????????mouseListeners?=?new?MouseListenerCollection();
????????mouseListeners.add(listener);
????}
????public?void?onBrowserEvent(Event?event)?{
????????switch?(DOM.eventGetType(event))?{
????????case?Event.ONCLICK:?{
????????????if?(clickListeners?!=?null)
????????????????clickListeners.fireClick(this);
????????????break;
????????}
????????case?Event.ONMOUSEDOWN:
????????case?Event.ONMOUSEUP:
????????case?Event.ONMOUSEMOVE:
????????case?Event.ONMOUSEOVER:
????????case?Event.ONMOUSEOUT:?{
????????????if?(mouseListeners?!=?null)
????????????????mouseListeners.fireMouseEvent(this,?event);
????????????break;
????????}
????????case?Event.ONLOAD:?{
????????????if?(loadListeners?!=?null)
????????????????loadListeners.fireLoad(this);
????????????break;
????????}
????????case?Event.ONERROR:?{
????????????if?(loadListeners?!=?null)
????????????????loadListeners.fireError(this);
????????????break;
????????}
????????}
????}
????public?void?removeClickListener(ClickListener?listener)?{
????????if?(clickListeners?!=?null)
????????????clickListeners.remove(listener);
????}
????public?void?removeLoadListener(LoadListener?listener)?{
????????if?(loadListeners?!=?null)
????????????loadListeners.remove(listener);
????}
????public?void?removeMouseListener(MouseListener?listener)?{
????????if?(mouseListeners?!=?null)
????????????mouseListeners.remove(listener);
????}
}