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GWT Bibliothek fuer Mobile Plattformen der SWM
/*
* Copyright 2011 SWM Services GmbH.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package de.swm.commons.mobile.client.widgets.progressbar;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException;
import com.google.gwt.user.client.rpc.InvocationException;
import de.swm.commons.mobile.client.widgets.LoadingIndicatorPopup;
import de.swm.gwt.client.progressbar.IProgressBarNoCancelWaitDialog;
import java.util.ArrayList;
import java.util.List;
/**
* Progress bar for mobile applications.
*
*/
public class MobileProgressBar implements IProgressBarNoCancelWaitDialog {
private final List callbacksToCancel = new ArrayList();
private final List runAsyncCallbacks = new ArrayList();
private final List> asyncCallbacks = new ArrayList>();
private boolean isStopped;
private final LoadingIndicatorPopup loadingPanel;
/**
* Default constructor.
*/
public MobileProgressBar() {
isStopped = true;
this.loadingPanel = new LoadingIndicatorPopup();
}
/**
* Constructor with possibility to enable info text.
*
* @param showInfoText whether an info text should be shown inside the loading indicator popup
*/
public MobileProgressBar(boolean showInfoText) {
isStopped = true;
this.loadingPanel = new LoadingIndicatorPopup(showInfoText);
}
/**
* Sets the information text that is shown inside the loading indicator popup.
*
* @param loadingText
*/
public void setLoadingText(String loadingText) {
this.loadingPanel.setLoadingText(loadingText);
}
/**
* Sets the subtitle that is shown inside the loading indicator popup.
*
* @param loadingText
*/
public void setLoadingSubtitleText(String loadingSubtitleText) {
this.loadingPanel.setLoadingSubtitleText(loadingSubtitleText);
}
/**
* Zeigt den Wartebalken an.
*
*
*/
public void showDialog() {
loadingPanel.showCentered(true);
}
/**
* {@inheritDoc}
*
* @see de.swm.issng.gkpk.client.utils.progressbar.IProgressBarWaitDialog#start()
*/
@Override
public AsyncCallback start(final AsyncCallback callbackToExecute) {
if (isStopped || !this.loadingPanel.isVisible()) {
showDialog();
}
isStopped = false;
final CancelMonitor monitor = new CancelMonitor();
AsyncCallback wrappedCallback = new AsyncCallback() {
@Override
public void onFailure(Throwable error) {
if (!monitor.isCanceled()) {
callbackToExecute.onFailure(error);
}
removeFromQueue(this);
// Falls es sich um eine Unchecked Exception auf dem Server handelt
// oder falls ein anderer unerwarteter Fehler auftritt (Netzwerk etc)
// oder falls der RemoteService nicht kompatibel ist
// werden alle Callbacks abgebrochen und der Dialog geschlossen.
if (error instanceof InvocationException || error instanceof IncompatibleRemoteServiceException) {
cancelCallbacksAndForceStop();
}
}
@Override
public void onSuccess(T success) {
if (!monitor.isCanceled()) {
callbackToExecute.onSuccess(success);
}
removeFromQueue(this);
}
};
callbacksToCancel.add(monitor);
asyncCallbacks.add(wrappedCallback);
return wrappedCallback;
}
/**
* {@inheritDoc}
*
* @see de.swm.issng.gkpk.client.utils.progressbar.IProgressBarWaitDialog#start()
*/
@Override
public void start(final RunAsyncCallback callbackToExecute) {
if (isStopped || !this.loadingPanel.isVisible()) {
showDialog();
}
isStopped = false;
final CancelMonitor monitor = new CancelMonitor();
RunAsyncCallback wrappedCallback = new RunAsyncCallback() {
@Override
public void onFailure(Throwable error) {
if (!monitor.isCanceled()) {
callbackToExecute.onFailure(error);
}
cancelCallbacksAndForceStop();
}
@Override
public void onSuccess() {
if (!monitor.isCanceled()) {
callbackToExecute.onSuccess();
}
removeFromQueue(this);
}
};
callbacksToCancel.add(monitor);
runAsyncCallbacks.add(wrappedCallback);
GWT.runAsync(wrappedCallback);
}
/**
* Canceled alles und entfernt alle wartenden callbacks.
*/
private void cancelCallbacksAndForceStop() {
this.runAsyncCallbacks.clear();
this.asyncCallbacks.clear();
for (CancelMonitor toCancel : callbacksToCancel) {
toCancel.setCanceled(true);
}
this.callbacksToCancel.clear();
isStopped = true;
this.loadingPanel.setVisible(false);
}
/**
* Entfernt den callback und canceled den Dialog, wenn es die letzte Aktion ist.
*
* @param toRemove
* der callbck der zu entfernen ist.
*/
private void removeFromQueue(RunAsyncCallback toRemove) {
this.runAsyncCallbacks.remove(toRemove);
if (asyncCallbacks.isEmpty() && runAsyncCallbacks.isEmpty()) {
cancelCallbacksAndForceStop();
}
}
/**
* Entfernt den callback und canceled den Dialog, wenn es die letzte Aktion ist.
*
* @param toRemove
* der callbck der zu entfernen ist.
*/
private void removeFromQueue(AsyncCallback toRemove) {
this.asyncCallbacks.remove(toRemove);
if (asyncCallbacks.isEmpty() && runAsyncCallbacks.isEmpty()) {
cancelCallbacksAndForceStop();
}
}
/**
* Hilfsklasse um einen laufenden callback zu canceln.
*
* @author Wiese.Daniel
* copyright (C) 2010-2011, SWM Services GmbH
*
*/
public static class CancelMonitor {
private boolean canceled = false;
public boolean isCanceled() {
return canceled;
}
public void setCanceled(boolean canceled) {
this.canceled = canceled;
}
}
}