GWT的loading indicator（装载指示器）

GWT的loading indicator（装载指示器）

本文参考：http://groups.google.com/group/Google-Web-Toolkit/browse_thread /thread/7ed0d179b89fa062/aaeb5391a760adef?lnk=gst&q=indicator+AsyncCallback&rnum=1#aaeb5391a760adef

大部分代码也是参考文中的。

Java代码

1. package com.javaeye.dengyin2000.truck.client.server;  
2.   
3. import com.google.gwt.user.client.Window;  
4. import com.google.gwt.user.client.rpc.AsyncCallback;  
5.   
6. public abstract class AsyncCallbackWithStatus implements AsyncCallback {  
7.     private static LoadingIndicator loadingIndicator;  
8.   
9.     public static final void setLoadingIndicator(LoadingIndicator indicator) {  
10.         loadingIndicator = indicator;  
11.     }  
12.   
13.     public AsyncCallbackWithStatus() {  
14.         setLoading(true);  
15.     }  
16.   
17.     public final void onSuccess(Object object) {  
18.         setLoading(false);  
19.         onSuccessInternal(object);  
20.     }  
21.   
22.     public final void onFailure(Throwable throwable) {  
23.         setLoading(false);  
24.         onFailureInternal(throwable);  
25.     }  
26.   
27.     protected abstract void onSuccessInternal(Object object);  
28.   
29.     protected void onFailureInternal(Throwable throwable){  
30.         Window.alert("服务器没有响应,请稍后再试!");  
31.     }  
32.   
33.     private void setLoading(boolean isLoading) {  
34.         if (null != loadingIndicator) {  
35.             if (isLoading) {  
36.                 loadingIndicator.show();  
37.             } else {  
38.                 loadingIndicator.hide();  
39.             }  
40.         }  
41.     }  
42.   
43.     interface LoadingIndicator {  
44.         void show();  
45.   
46.         void hide();  
47.     }  
48.   
49. }  

package com.javaeye.dengyin2000.truck.client.server;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
public abstract class AsyncCallbackWithStatus implements AsyncCallback {
private static LoadingIndicator loadingIndicator;
public static final void setLoadingIndicator(LoadingIndicator indicator) {
loadingIndicator = indicator;
}
public AsyncCallbackWithStatus() {
setLoading(true);
}
public final void onSuccess(Object object) {
setLoading(false);
onSuccessInternal(object);
}
public final void onFailure(Throwable throwable) {
setLoading(false);
onFailureInternal(throwable);
}
protected abstract void onSuccessInternal(Object object);
protected void onFailureInternal(Throwable throwable){
Window.alert("服务器没有响应,请稍后再试!");
}
private void setLoading(boolean isLoading) {
if (null != loadingIndicator) {
if (isLoading) {
loadingIndicator.show();
} else {
loadingIndicator.hide();
}
}
}
interface LoadingIndicator {
void show();
void hide();
}
}

Java代码

1. package com.javaeye.dengyin2000.truck.client.server;  
2.   
3. import com.google.gwt.user.client.Window;  
4. import com.google.gwt.user.client.WindowResizeListener;  
5. import com.google.gwt.user.client.ui.HTML;  
6. import com.google.gwt.user.client.ui.PopupPanel;  
7. import com.javaeye.dengyin2000.truck.client.server.AsyncCallbackWithStatus.LoadingIndicator;  
8.   
9. public class LoadingStatus implements LoadingIndicator, WindowResizeListener {  
10.     private PopupPanel popup;  
11.   
12.     public LoadingStatus() {  
13.         popup = new PopupPanel();  
14.         popup.add(new HTML("<div style='background-color: red;'> Loading, please wait...</div>"));  
15.         placeIndicator();  
16.         Window.addWindowResizeListener(this);  
17.         // set the style name for greater control over the  
18.     }  
19.   
20.     public void show() {  
21.         popup.show();   
22.     }  
23.   
24.     public void hide() {  
25.         popup.hide();  
26.     }  
27.   
28.     private void placeIndicator(){  
29.         popup.setPopupPosition(Window.getClientWidth() - 120, 10);  
30.     }  
31.       
32.     public void onWindowResized(int width, int height) {  
33.          placeIndicator();  
34.     }   
35.   
36. }  

package com.javaeye.dengyin2000.truck.client.server;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.WindowResizeListener;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.PopupPanel;
import com.javaeye.dengyin2000.truck.client.server.AsyncCallbackWithStatus.LoadingIndicator;
public class LoadingStatus implements LoadingIndicator, WindowResizeListener {
private PopupPanel popup;
public LoadingStatus() {
popup = new PopupPanel();
popup.add(new HTML("<div style='background-color: red;'> Loading, please wait...</div>"));
placeIndicator();
Window.addWindowResizeListener(this);
// set the style name for greater control over the
}
public void show() {
popup.show();
}
public void hide() {
popup.hide();
}
private void placeIndicator(){
popup.setPopupPosition(Window.getClientWidth() - 120, 10);
}
public void onWindowResized(int width, int height) {
placeIndicator();
}
}

在你的EntryPoint中装配好你的indicator

Java代码

1. private void prepareLoadingIndicator(){  
2.     LoadingStatus status = new LoadingStatus();  
3.     AsyncCallbackWithStatus.setLoadingIndicator(status);  
4. }  

	private void prepareLoadingIndicator(){
LoadingStatus status = new LoadingStatus();
AsyncCallbackWithStatus.setLoadingIndicator(status);
}

这样调用。

Java代码

1. private void populateAndReadEnterprisesInfo(){  
2.     GWTRPCServiceLocator.getUserService().getEnterprisesInfo(new AsyncCallbackWithStatus(){  
3.   
4.         protected void onSuccessInternal(Object object) {  
5.             EnterprisesInfoGTO gto = (EnterprisesInfoGTO) object;  
6.             enterpriseName.setText(gto.getEnterprisesName());  
7.             contactName.setText(gto.getContactName());  
8.             contactTel.setText(gto.getContactTel());  
9.             contactFax.setText(gto.getContactFax());  
10.             contactAddress.setText(gto.getContactAddress());  
11.             zipCode.setText(gto.getZipCode());  
12.             email.setText(gto.getEmail());  
13.             siteAddress.setText(gto.getSiteAddress());  
14.         }  
15.           
16.     });  
17. }