search paging improvement

diylc/diylc-core/src/org/diylc/plugins/cloud/presenter/PagingProvider.java

@@ -0,0 +1,40 @@
+package org.diylc.plugins.cloud.presenter;
+
+import java.util.List;
+
+import org.diylc.plugins.cloud.model.ProjectEntity;
+
+public class PagingProvider {
+
+  private CloudPresenter cloudPresenter;
+
+  private String searchFor;
+  private String category;
+  private String sort;
+  private int itemsPerPage = 10;
+
+  private int currentPage;
+  private List<ProjectEntity> currentResults;
+
+  public PagingProvider(CloudPresenter cloudPresenter) {
+    this.cloudPresenter = cloudPresenter;
+  }
+
+  public List<ProjectEntity> startSession(String searchFor, String category, String sort) throws CloudException {
+    this.searchFor = searchFor;
+    this.category = category;
+    this.sort = sort;
+    this.currentPage = 1;
+
+    return currentResults = cloudPresenter.search(searchFor, category, sort, currentPage, itemsPerPage);
+  }
+
+  public boolean hasMoreData() {
+    return this.currentResults != null && this.currentResults.size() == itemsPerPage;
+  }
+
+  public List<ProjectEntity> requestMoreData() throws CloudException {
+    currentPage++;
+    return currentResults = cloudPresenter.search(searchFor, category, sort, currentPage, itemsPerPage);
+  }
+}

diylc/diylc-swing/src/org/diylc/images/IconLoader.java

@@ -33,7 +33,7 @@ public enum IconLoader {
       "arrow.png"), Cloud("cloud.png"), CloudUp("cloud_up.png"), CloudGear("cloud_gear.png"), IdCardEdit(
       "id_card_edit.png"), KeyEdit("key_edit.png"), Find("find.png"), Dashboard("dashboard.png"), DataFind(
       "data_find.png"), CloudDownload("cloud-download.png"), NavLeftBlue("nav_left_blue.png"), NavRightBlue(
-      "nav_right_blue.png"), MissingImage("missing_image.png"), CloudBg("cloud_bg.png");
+      "nav_right_blue.png"), MissingImage("missing_image.png"), CloudBg("cloud_bg.png"), CloudBig("cloud_big.png");
 
   protected String name;
 

diylc/diylc-swing/src/org/diylc/swing/plugins/cloud/view/browser/AnimatedCloudGlassPane.java

@@ -28,9 +28,9 @@ import org.diylc.images.IconLoader;
  * 
  * @author bancika
  */
-public class CloudGlassPane extends JPanel implements MouseListener, KeyListener {
+public class AnimatedCloudGlassPane extends JPanel implements MouseListener, KeyListener {
 
-  public static final CloudGlassPane GLASS_PANE = new CloudGlassPane();
+  public static final AnimatedCloudGlassPane GLASS_PANE = new AnimatedCloudGlassPane();
 
   private static final long serialVersionUID = -5344758920442881290L;
 
@@ -42,7 +42,7 @@ public class CloudGlassPane extends JPanel implements MouseListener, KeyListener
 
   private VolatileImage volatileImg;
 
-  public CloudGlassPane() {
+  public AnimatedCloudGlassPane() {
     addKeyListener(this);
     addMouseListener(this);
     setCursor(new Cursor(Cursor.WAIT_CURSOR));

diylc/diylc-swing/src/org/diylc/swing/plugins/cloud/view/browser/CloudBrowserFrame.java

@@ -27,6 +27,7 @@ import org.diylc.core.IView;
 import org.diylc.images.IconLoader;
 import org.diylc.plugins.cloud.model.ProjectEntity;
 import org.diylc.plugins.cloud.presenter.CloudPresenter;
+import org.diylc.plugins.cloud.presenter.PagingProvider;
 import org.diylc.swing.ISwingUI;
 
 public class CloudBrowserFrame extends JFrame {
@@ -45,15 +46,7 @@ public class CloudBrowserFrame extends JFrame {
 
   private IPlugInPort plugInPort;
   private CloudPresenter cloudPresenter;
-
+  private PagingProvider pagingProvider;
-  private List<ProjectEntity> currentResults;
-
-  // search criteria
-  private String searchFor;
-  private String category;
-  private String sort;
-  private int pageNumber;
-  private int itemsPerPage = 10;
 
   private ISwingUI swingUI;
 
@@ -64,11 +57,12 @@ public class CloudBrowserFrame extends JFrame {
     this.setPreferredSize(new Dimension(700, 640));
     this.plugInPort = plugInPort;
     this.cloudPresenter = cloudPresenter;
+    this.pagingProvider = new PagingProvider(cloudPresenter);
 
     setContentPane(getSearchPanel());
     this.pack();
     this.setLocationRelativeTo(swingUI.getOwnerFrame());
-    this.setGlassPane(new CloudGlassPane());
+    this.setGlassPane(SimpleCloudGlassPane.GLASS_PANE);
 
     JRootPane rootPane = SwingUtilities.getRootPane(getSearchHeaderPanel().getGoButton());
     rootPane.setDefaultButton(getSearchHeaderPanel().getGoButton());
@@ -144,11 +138,6 @@ public class CloudBrowserFrame extends JFrame {
 
         @Override
         public void actionPerformed(ActionEvent e) {
-          CloudBrowserFrame.this.pageNumber = 1;
-          CloudBrowserFrame.this.searchFor = getSearchHeaderPanel().getSearchText();
-          CloudBrowserFrame.this.category = getSearchHeaderPanel().getCategory();
-          CloudBrowserFrame.this.sort = getSearchHeaderPanel().getSorting();
-          getResultsScrollPane().startOver();
           search();
         }
       });
@@ -158,29 +147,19 @@ public class CloudBrowserFrame extends JFrame {
 
   private ResultsScrollPanel getResultsScrollPane() {
     if (resultsScrollPane == null) {
-      resultsScrollPane = new ResultsScrollPanel(swingUI, this, plugInPort, new ILazyProvider<ProjectEntity>() {
+      resultsScrollPane = new ResultsScrollPanel(swingUI, this, plugInPort, pagingProvider);
-
-        @Override
-        public void requestMoreData() {
-          CloudBrowserFrame.this.pageNumber++;
-          CloudBrowserFrame.this.search();
-        }
-
-        @Override
-        public boolean hasMoreData() {
-          return currentResults.size() == itemsPerPage;
-        }
-      });
     }
     return resultsScrollPane;
   }
 
   private void search() {
+    getResultsScrollPane().clearPrevious();
     executeBackgroundTask(new ITask<List<ProjectEntity>>() {
 
       @Override
       public List<ProjectEntity> doInBackground() throws Exception {
-        return cloudPresenter.search(searchFor, category, sort, pageNumber, itemsPerPage);
+        return pagingProvider.startSession(getSearchHeaderPanel().getSearchText(),
+            getSearchHeaderPanel().getCategory(), getSearchHeaderPanel().getSorting());
       }
 
       @Override
@@ -191,8 +170,7 @@ public class CloudBrowserFrame extends JFrame {
 
       @Override
       public void complete(List<ProjectEntity> result) {
-        CloudBrowserFrame.this.currentResults = result;
+        getResultsScrollPane().startSearch(result);
-        getResultsScrollPane().addData(result);
       }
     });
   }

diylc/diylc-swing/src/org/diylc/swing/plugins/cloud/view/browser/ILazyProvider.java

@@ -1,21 +0,0 @@
-package org.diylc.swing.plugins.cloud.view.browser;
-
-/***
- * Generic interface for dynamic data provider.
- * 
- * @author Branislav Stojkovic
- *
- * @param <T>
- */
-public interface ILazyProvider<T> {
-
-  /**
-   * @return true if there's potentially more data at the source
-   */
-  boolean hasMoreData();
-
-  /**
-   * call to request more data. New data batch should be sent asynchronously to this function call.
-   */
-  void requestMoreData();
-}

diylc/diylc-swing/src/org/diylc/swing/plugins/cloud/view/browser/ResultsScrollPanel.java

@@ -6,7 +6,6 @@ import java.awt.Graphics;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.Insets;
-import java.awt.Point;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.image.BufferedImage;
@@ -29,6 +28,7 @@ import javax.swing.JScrollPane;
 import javax.swing.JSeparator;
 import javax.swing.JTextArea;
 import javax.swing.SwingConstants;
+import javax.swing.SwingWorker;
 
 import org.apache.log4j.Logger;
 import org.diylc.common.IPlugInPort;
@@ -36,6 +36,7 @@ import org.diylc.common.ITask;
 import org.diylc.core.IView;
 import org.diylc.images.IconLoader;
 import org.diylc.plugins.cloud.model.ProjectEntity;
+import org.diylc.plugins.cloud.presenter.PagingProvider;
 import org.diylc.swing.ISwingUI;
 import org.diylc.swing.gui.DialogFactory;
 import org.diylc.swing.plugins.file.FileFilterEnum;
@@ -63,10 +64,9 @@ public class ResultsScrollPanel extends JScrollPane {
    * This flag tells us whether the loadMoreLabel should invoke a new data pull or not.
    */
   private boolean armed;
-  private ILazyProvider<ProjectEntity> provider;
+  private PagingProvider provider;
 
-  public ResultsScrollPanel(ISwingUI mainUI, CloudBrowserFrame cloudUI, IPlugInPort plugInPort,
+  public ResultsScrollPanel(ISwingUI mainUI, CloudBrowserFrame cloudUI, IPlugInPort plugInPort, PagingProvider provider) {
-      ILazyProvider<ProjectEntity> provider) {
     super();
     this.mainUI = mainUI;
     this.cloudUI = cloudUI;
@@ -78,18 +78,24 @@ public class ResultsScrollPanel extends JScrollPane {
     setViewportView(getResultsPanel());
   }
 
-  public void startOver() {
+  public void clearPrevious() {
     currentLocation = 0;
     getResultsPanel().removeAll();
     armed = false;
+  }
+
+  public void startSearch(List<ProjectEntity> projects) {
     GridBagConstraints gbc = new GridBagConstraints();
     gbc.anchor = GridBagConstraints.NORTHWEST;
     gbc.gridx = 0;
     gbc.gridy = 10000;
     gbc.fill = GridBagConstraints.BOTH;
-    gbc.weightx = 0;
+    gbc.weightx = 1;
     gbc.weighty = 100;
+    gbc.gridwidth = 3;
     resultsPanel.add(getLoadMoreLabel(), gbc);
+
+    addData(projects);
   }
 
   public void showNoMatches() {
@@ -109,12 +115,15 @@ public class ResultsScrollPanel extends JScrollPane {
     if (projects == null || projects.isEmpty() && currentLocation == 0) {
       showNoMatches();
     } else {
+      LOG.info("Adding " + projects.size() + " projects to display.");
       for (int i = 0; i < projects.size(); i++) {
         addProjectToDisplay(projects.get(i));
         this.currentLocation++;
       }
       armed = true;
-    }    
+    }
+
+    getLoadMoreLabel().setText(provider.hasMoreData() ? "Loading more data..." : "");
   }
 
   private JComponent addProjectToDisplay(final ProjectEntity project) {
@@ -253,24 +262,50 @@ public class ResultsScrollPanel extends JScrollPane {
     gbc.insets = new Insets(2, 2, 2, 2);
     getResultsPanel().add(new JSeparator(), gbc);
 
+    getResultsPanel().invalidate();
+
     return thumbnailLabel;
   }
 
   private JLabel getLoadMoreLabel() {
     if (loadMoreLabel == null) {
-      loadMoreLabel = new JLabel("Load more...") {
+      loadMoreLabel = new JLabel("Loading more data...") {
 
         private static final long serialVersionUID = 1L;
 
         @Override
         public void paint(Graphics g) {
+          super.paint(g);
           if (armed && provider.hasMoreData()) {
             // disarm immediately so we don't trigger successive requests to the provider
             armed = false;
-            provider.requestMoreData();
+            SwingWorker<List<ProjectEntity>, Void> worker = new SwingWorker<List<ProjectEntity>, Void>() {
+
+              @Override
+              protected List<ProjectEntity> doInBackground() throws Exception {
+                return provider.requestMoreData();
+              }
+
+              @Override
+              protected void done() {
+                try {
+                  List<ProjectEntity> newResults = get();
+                  if (newResults != null && !newResults.isEmpty())
+                    addData(newResults);
+                  else
+                    getLoadMoreLabel().setText("");
+                } catch (Exception e) {
+                  cloudUI.showMessage("Search failed! Detailed message is in the logs. Please report to the author.",
+                      "Search Failed", IView.ERROR_MESSAGE);
+                }
+              }
+            };
+            worker.execute();
           }
         }
       };
+      loadMoreLabel.setHorizontalAlignment(SwingConstants.CENTER);
+      loadMoreLabel.setFont(loadMoreLabel.getFont().deriveFont(10f));
     }
     return loadMoreLabel;
   }

diylc/diylc-swing/src/org/diylc/swing/plugins/cloud/view/browser/SimpleCloudGlassPane.java

@@ -0,0 +1,79 @@
+package org.diylc.swing.plugins.cloud.view.browser;
+
+import java.awt.Cursor;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.SwingConstants;
+
+import org.diylc.images.IconLoader;
+
+/**
+ * JPanel that shows cloud animation while visible.
+ * 
+ * @author bancika
+ */
+public class SimpleCloudGlassPane extends JPanel implements MouseListener, KeyListener {
+
+  public static final SimpleCloudGlassPane GLASS_PANE = new SimpleCloudGlassPane();
+
+  private static final long serialVersionUID = -5344758920442881290L;
+
+
+  public SimpleCloudGlassPane() {
+    addKeyListener(this);
+    addMouseListener(this);
+    setCursor(new Cursor(Cursor.WAIT_CURSOR));
+    setOpaque(false);
+
+    setLayout(new GridBagLayout());
+
+    GridBagConstraints gbc = new GridBagConstraints();
+    gbc.gridx = 0;
+    gbc.gridy = 0;
+    gbc.anchor = GridBagConstraints.LAST_LINE_START;
+    gbc.fill = GridBagConstraints.HORIZONTAL;
+    gbc.weightx = 1;
+    gbc.weighty = 1;
+    JLabel cloudLabel = new JLabel(IconLoader.CloudBig.getIcon());
+    cloudLabel.setHorizontalAlignment(SwingConstants.CENTER);
+    add(cloudLabel, gbc);
+
+    gbc.gridy = 1;
+    gbc.weighty = 1.5;
+    gbc.anchor = GridBagConstraints.FIRST_LINE_START;
+    JLabel label = new JLabel("<html><font size='5' color='#999999'>Querying the cloud...</font></html>");
+    label.setHorizontalAlignment(SwingConstants.CENTER);
+    add(label, gbc);
+  }
+
+  @Override
+  public void mouseClicked(final MouseEvent pArg0) {}
+
+  @Override
+  public void mouseEntered(final MouseEvent pArg0) {}
+
+  @Override
+  public void mouseExited(final MouseEvent pArg0) {}
+
+  @Override
+  public void mousePressed(final MouseEvent pArg0) {}
+
+  @Override
+  public void mouseReleased(final MouseEvent pArg0) {}
+
+  @Override
+  public void keyPressed(KeyEvent e) {}
+
+  @Override
+  public void keyReleased(KeyEvent e) {}
+
+  @Override
+  public void keyTyped(KeyEvent e) {}
+}