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news-feed
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automatic load of previous feeds on scrolling done 

git-svn-id: http://svn.research-infrastructures.eu/public/d4science/gcube/trunk/portlets/user/news-feed@94027 82a268e6-3cf1-43bd-a215-b396298e98cf
This commit is contained in:
Massimiliano Assante 2014-04-01 23:01:27 +00:00
parent 2683e7284f
commit 3cacb91ead
3 changed files with 42 additions and 9 deletions
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3
.settings/org.eclipse.wst.common.component
View File

@ -4,9 +4,6 @@
<wb-resource deploy-path="/" source-path="/src/main/webapp" tag="defaultRootSource"/>
<wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/java"/>
<wb-resource deploy-path="/WEB-INF/classes" source-path="/target/generated-sources/gwt"/>
<dependent-module archiveName="user-selection-dialog-1.1.0-SNAPSHOT.jar" deploy-path="/WEB-INF/lib" handle="module:/resource/user-selection-dialog/user-selection-dialog">
<dependency-type>uses</dependency-type>
</dependent-module>
<property name="java-output-path" value="/${module}/target/www/WEB-INF/classes"/>
<property name="context-root" value="news-feed"/>
</wb-module>

45
src/main/java/org/gcube/portlets/user/newsfeed/client/panels/NewsFeedPanel.java
View File

@ -52,10 +52,13 @@ import org.gcube.portlets.widgets.userselection.shared.ItemSelectableBean;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.Location;
import com.google.gwt.user.client.Window.ScrollEvent;
import com.google.gwt.user.client.Window.ScrollHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTML;
@ -65,6 +68,7 @@ import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
/**
*
* @author Massimiliano Assante, ISTI-CNR
@ -115,6 +119,7 @@ public class NewsFeedPanel extends Composite {
private UserInfo myUserInfo;
private FilterType currentFilter;
private Timer feedsTimer;
private ShowMoreFeeds showMoreWidget;
//needed to know the next range start
private Integer fromStartingPoint;
@ -231,7 +236,7 @@ public class NewsFeedPanel extends Composite {
newsPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_TOP);
loadingImage = new Image(loading);
newsPanel.add(loadingImage);
newsService.getUserSettings(new AsyncCallback<UserSettings>() {
@Override
public void onFailure(Throwable caught) {
@ -276,10 +281,19 @@ public class NewsFeedPanel extends Composite {
}
};
feedsTimer.scheduleRepeating(delayMillis);
//this is for the automatic scroll of feeds
Window.addWindowScrollHandler(new ScrollHandler() {
@Override
public void onWindowScroll(ScrollEvent event) {
boolean isInView = isScrolledIntoView(showMoreWidget);
if (isInView) {
eventBus.fireEvent(new ShowMoreUpdatesEvent());
}
}
});
}
/**
* stop the feeds timer (when session expires)
*/
@ -300,6 +314,8 @@ public class NewsFeedPanel extends Composite {
case MINE:
showOnlyMyFeeds();
break;
default:
break;
}
}
/**
@ -505,7 +521,8 @@ public class NewsFeedPanel extends Composite {
if (feeds.size() >= feedsNoPerCategory*3-1 && (!isInfrastructure)) {
GWT.log("Show MORE " + feedsNoPerCategory);
showMoreUpdatesPanel.setHorizontalAlignment(HasAlignment.ALIGN_CENTER);
showMoreUpdatesPanel.add(new ShowMoreFeeds(eventBus));
showMoreWidget = new ShowMoreFeeds(eventBus);
showMoreUpdatesPanel.add(showMoreWidget);
newsPanel.add(showMoreUpdatesPanel);
}
isFirstTweet = false;
@ -530,6 +547,7 @@ public class NewsFeedPanel extends Composite {
*/
protected void doShowMoreUpdates() {
showMoreUpdatesPanel.remove(0);
loadingImage.getElement().getStyle().setMargin(10, Unit.PX);
showMoreUpdatesPanel.add(loadingImage);
int from = (fromStartingPoint == null) ? allUpdates.size()+1 : fromStartingPoint;
@ -552,7 +570,8 @@ public class NewsFeedPanel extends Composite {
if (c >= quantity) { //there could be more feeds
GWT.log("there could be more feeds");
showMoreUpdatesPanel.clear();
showMoreUpdatesPanel.add(new ShowMoreFeeds(eventBus));
showMoreWidget = new ShowMoreFeeds(eventBus);
showMoreUpdatesPanel.add(showMoreWidget);
newsPanel.add(showMoreUpdatesPanel);
}
}
@ -566,6 +585,20 @@ public class NewsFeedPanel extends Composite {
}
});
}
/**
* @param widget the widget to check
* @returnn true if the widget is in the visible part of the page
*/
private boolean isScrolledIntoView(Widget widget) {
if (widget != null) {
int docViewTop = Window.getScrollTop();
int docViewBottom = docViewTop + Window.getClientHeight();
int elemTop = widget.getAbsoluteTop();
int elemBottom = elemTop + widget.getOffsetHeight();
return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
return false;
}
private boolean isFeedPresent(EnhancedFeed toCheck) {
for (EnhancedFeed feed : allUpdates) {

3
src/main/java/org/gcube/portlets/user/newsfeed/client/templates/ShowMoreFeeds.java
View File

@ -4,6 +4,7 @@ import org.gcube.portlets.user.newsfeed.client.event.ShowMoreUpdatesEvent;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.dom.client.Style.Visibility;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.uibinder.client.UiBinder;
@ -38,6 +39,8 @@ public class ShowMoreFeeds extends Composite {
caption.getElement().getStyle().setBackgroundColor("transparent");
caption.getElement().getStyle().setFontSize(14, Unit.PX);
caption.setHTML("Show more feeds");
//done after
panel.getElement().getStyle().setVisibility(Visibility.HIDDEN);
}
@UiHandler("caption")