gCubeSystem
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image-previewer-widget
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added chached image, to avoid multiple download of the same image 

git-svn-id: http://svn.research-infrastructures.eu/public/d4science/gcube/trunk/portlets/widgets/image-previewer-widget@134913 82a268e6-3cf1-43bd-a215-b396298e98cf
This commit is contained in:
Costantino Perciante 2016-11-26 15:10:04 +00:00
parent 8497c44374
commit d0dfa453a4
2 changed files with 57 additions and 28 deletions
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15
src/main/java/org/gcube/portlets/widgets/imagepreviewerwidget/client/EnhancedImage.java
View File

@ -2,6 +2,8 @@ package org.gcube.portlets.widgets.imagepreviewerwidget.client;
import org.gcube.portlets.widgets.imagepreviewerwidget.shared.Orientation;
import com.github.gwtbootstrap.client.ui.Image;
/**
* This class allows to build the image to show within the carousel. It contains:
* <ul>
@ -34,6 +36,11 @@ public class EnhancedImage {
*/
private Orientation orientation = Orientation.UNDEFINED;
/**
* The cached image (once downloaded)
*/
private Image cachedImage;
/**
* Build an enhanced image from a url.
* @param imageUrl the url of the image.
@ -129,6 +136,14 @@ public class EnhancedImage {
this.orientation = orientation;
}
public Image getCachedImage() {
return cachedImage;
}
public void setCachedImage(Image cachedImage) {
this.cachedImage = cachedImage;
}
@Override
public String toString() {
return "EnhancedImage [titleToShow=" + titleToShow + ", toolTipToShow="

64
src/main/java/org/gcube/portlets/widgets/imagepreviewerwidget/client/ui/Carousel.java
View File

@ -332,40 +332,54 @@ public class Carousel extends Composite{
showLoader();
final EnhancedImage imageToShow = listOfAttachmentsToShow.get(index);
final String url = imageToShow.getImageUrl();
// when image is downloaded ...
shownImage.addLoadHandler(new LoadHandler() {
// check if it was already shown before and cached...
if(imageToShow.getCachedImage() != null){
@Override
public void onLoad(LoadEvent event) {
shownImage = imageToShow.getCachedImage();
setOrientation(imageToShow, imageToShow.getOrientation());
// call only if undefined
if(imageToShow.getOrientation().equals(Orientation.UNDEFINED)){
}else{
imageServices.getImageOrientation(url, new AsyncCallback<Orientation>() {
final String url = imageToShow.getImageUrl();
@Override
public void onSuccess(Orientation result) {
imageToShow.setOrientation(result);
setOrientation(imageToShow, result);
}
// when image is downloaded ...
shownImage.addLoadHandler(new LoadHandler() {
@Override
public void onFailure(Throwable caught) {
imageToShow.setOrientation(Orientation.DO_NOT_ROTATE);
setOrientation(imageToShow, Orientation.DO_NOT_ROTATE);
}
});
@Override
public void onLoad(LoadEvent event) {
}else{
setOrientation(imageToShow, imageToShow.getOrientation());
// call only if undefined
if(imageToShow.getOrientation().equals(Orientation.UNDEFINED)){
imageServices.getImageOrientation(url, new AsyncCallback<Orientation>() {
@Override
public void onSuccess(Orientation result) {
imageToShow.setOrientation(result);
setOrientation(imageToShow, result);
}
@Override
public void onFailure(Throwable caught) {
imageToShow.setOrientation(Orientation.DO_NOT_ROTATE);
setOrientation(imageToShow, Orientation.DO_NOT_ROTATE);
}
});
}else{
setOrientation(imageToShow, imageToShow.getOrientation());
}
// cache it
imageToShow.setCachedImage(shownImage);
}
}
});
});
// fetch the image from the url
shownImage.setUrl(url);
// fetch the image from the url
shownImage.setUrl(url);
}
// change image tooltip
shownImage.setTitle(imageToShow.getToolTipToShow());