changed the business logic to show the preview on files

src/main/java/org/gcube/portlets/user/workspace/client/view/windows/DialogGetInfoBootstrap.java

@@ -62,7 +62,7 @@ import com.google.gwt.user.server.Base64Utils;
  */
 public class DialogGetInfoBootstrap extends Composite {
 
-	private static final int PREVIEW_WAITING_TIME = 10000;
+	private static final int PREVIEW_WAITING_TIME = 9000; //9 sec
 
 	private static DialogGetInfoBootstrapUiBinder uiBinder = GWT.create(DialogGetInfoBootstrapUiBinder.class);
 
@@ -197,6 +197,10 @@ public class DialogGetInfoBootstrap extends Composite {
 	
 	private Image noPreviewAvailable = new Image(Resources.getPreviewNotAvailable());
 	
+	private Frame iFrameGDV = null;
+	
+	private Timer timerGDV = null;
+
 	/**
 	 * Instantiates a new dialog get info bootstrap.
 	 *
@@ -335,36 +339,46 @@ public class DialogGetInfoBootstrap extends Composite {
 			loadACLsDescriptionForSharedFolder(fileModel.getIdentifier());
 		}
 		
+		boolean previewManaged = false;
+		
 		if (typeEnum != null) {
 		
 			// is it an image?
 			if (typeEnum.equals(GXTFolderItemTypeEnum.IMAGE_DOCUMENT)
 					|| typeEnum.equals(GXTFolderItemTypeEnum.EXTERNAL_IMAGE)) {
+				previewManaged = true;	
 				loadThumbnailsForImage();
 			}
-
 			// is it a GCUBE-Item?
 			if (typeEnum.equals(GXTFolderItemTypeEnum.GCUBE_ITEM)) {
+				previewManaged = true;	//preview not avaible for the type GCUBE_ITEM
 				loadGcubeItemProperties();
 			}
+		}
 		
+		//If the preview is not managed
+		//through the previous code
+		//managing it by checking the mime-type
+		if(!previewManaged) {
 			
+			if (!fileModel.isDirectory() && mapAllowedMimeTypesForPreview.containsKey(fileModel.getType())) {
 				// SOLUTION BASED ON GOOGLE DOC VIEWER
-			if (typeEnum.equals(GXTFolderItemTypeEnum.EXTERNAL_PDF_FILE)
-					|| typeEnum.equals(GXTFolderItemTypeEnum.PDF_DOCUMENT)
-					|| typeEnum.equals(GXTFolderItemTypeEnum.EXTERNAL_FILE)
-					|| typeEnum.equals(GXTFolderItemTypeEnum.GCUBE_ITEM)
-					|| typeEnum.equals(GXTFolderItemTypeEnum.URL_DOCUMENT)
-					|| typeEnum.equals(GXTFolderItemTypeEnum.METADATA)){
-				
-				if(mapAllowedMimeTypesForPreview.containsKey(fileModel.getType())){
 				GWT.log("Mime type " + fileModel.getType() + " allowed for preview, try to display it");
 			
+				final HTML loadingPreviewHTML = new HTML();
+				setPlaceholder(loadingPreviewHTML, true, "loading preview...");
+				htmlPanelFilePreview.add(loadingPreviewHTML);
+				htmlPanelFilePreview.setVisible(true);
+				
 				AppControllerExplorer.rpcWorkspaceService.getPublicLinkForFileItemId(fileModel.getIdentifier(), false,
 						new AsyncCallback<PublicLink>() {
 			
 							@Override
 							public void onFailure(Throwable caught) {
+								removePlaceHolder(loadingPreviewHTML);
+								GWT.log("Error on loading the Public link for: "+fileModel.getIdentifier());
+								htmlPanelFilePreview.add(noPreviewAvailable);
+								htmlPanelFilePreview.setVisible(true);
 							}
 			
 							@Override
@@ -383,20 +397,13 @@ public class DialogGetInfoBootstrap extends Composite {
 										return;
 									}
 			
-	//									String pdfPreview = "<iframe frameBorder=\"0\" class=\"my-preview-doc\" "
-	//											+ "src=\"https://docs.google.com/viewer?url="
-	//											+ URL.encode(result.getCompleteURL()) + "&embedded=true\">" + "</iframe>";
-										
 									String googleDocViewerURL = "https://docs.google.com/viewer?url="
 											+ URL.encode(result.getCompleteURL()) + "&embedded=true";
 			
-										final HTML loadingPreviewHTML = new HTML();
+									iFrameGDV = instanceFrame(googleDocViewerURL, loadingPreviewHTML);
-										setPlaceholder(loadingPreviewHTML, true, "loading preview...");
-										
-										final Frame frame = instanceFrame(googleDocViewerURL, loadingPreviewHTML);
 			
 									final long startTime = new Date().getTime();
-										Timer timer = new Timer() {
+									timerGDV = new Timer() {
 			
 										@Override
 										public void run() {
@@ -411,23 +418,21 @@ public class DialogGetInfoBootstrap extends Composite {
 											long diff = checkTime - startTime;
 											if (diff > PREVIEW_WAITING_TIME) {// is greater than 10 sec
 												try {
-														GWT.log("iFrameGoogleDocViewer not loaded within 5 sec, cancelling timer, removing iframe");
+													GWT.log("iFrameGoogleDocViewer not loaded within "+PREVIEW_WAITING_TIME+" sec, cancelling timer, removing iframe");
 													cancel();
 													removePlaceHolder(loadingPreviewHTML);
 													htmlPanelFilePreview.add(noPreviewAvailable);
-														frame.setVisible(false);
+													iFrameGDV.setVisible(false);
-														htmlPanelFilePreview.remove(frame);
+													htmlPanelFilePreview.remove(iFrameGDV);
 												} catch (Exception e) {
 													// Silent
 												}
 											}
 										}
 									};
-										timer.scheduleRepeating(200);
+									timerGDV.scheduleRepeating(PREVIEW_WAITING_TIME/3);
+									htmlPanelFilePreview.add(iFrameGDV);
 
-										htmlPanelFilePreview.add(loadingPreviewHTML);
-										htmlPanelFilePreview.add(frame);
-										htmlPanelFilePreview.setVisible(true);
 								}
 							}
 						});
@@ -437,11 +442,24 @@ public class DialogGetInfoBootstrap extends Composite {
 				htmlPanelFilePreview.setVisible(true);
 			}
 		}
-		}
 
 		addHandlers();
 	}
 	
+	@Override
+	protected void onDetach() {
+		super.onDetach();
+		GWT.log("Detached...");
+		htmlPanelFilePreview.clear();
+		if(timerGDV!=null) {
+			try {
+				timerGDV.cancel();
+			}catch (Exception e) {
+				// TODO: handle exception
+			}
+		}
+	}
+	
 	public Frame instanceFrame(String fileURL, final HTML thePreviewPlaceholder) {
 		//addLoading();
 		String urlEncoded = URL.encode(fileURL);