Synnefo » Pithos

/*

 * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.client;

import gr.ebs.gss.client.dnd.DnDFocusPanel;

import gr.ebs.gss.client.rest.GetCommand;

import gr.ebs.gss.client.rest.RestCommand;

import gr.ebs.gss.client.rest.RestException;

import gr.ebs.gss.client.rest.resource.FileResource;

import gr.ebs.gss.client.rest.resource.SearchResource;

import gr.ebs.gss.client.rest.resource.UserResource;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import com.google.gwt.core.client.GWT;

import com.google.gwt.http.client.URL;

import com.google.gwt.i18n.client.DateTimeFormat;

import com.google.gwt.user.client.DOM;

import com.google.gwt.user.client.DeferredCommand;

import com.google.gwt.user.client.Event;

import com.google.gwt.user.client.IncrementalCommand;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.user.client.ui.ClickListener;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.Grid;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;

import com.google.gwt.user.client.ui.HorizontalPanel;

import com.google.gwt.user.client.ui.SourcesTableEvents;

import com.google.gwt.user.client.ui.TableListener;

import com.google.gwt.user.client.ui.VerticalPanel;

import com.google.gwt.user.client.ui.Widget;

/**

 * A composite that displays a list of search results for a particular query on

 * files.

 */

public class SearchResults extends Composite implements TableListener, ClickListener {

        private HTML prevButton = new HTML("<a href='javascript:;'>&lt; Previous</a>", true);

        private HTML nextButton = new HTML("<a href='javascript:;'>Next &gt;</a>", true);

        private String showingStats = "";

        private int startIndex = 0;

        /**

         * A constant that denotes the completion of an IncrementalCommand.

         */

        public static final boolean DONE = false;

        private boolean clickControl = false;

        private boolean clickShift = false;

        private int firstShift = -1;

        private ArrayList<Integer> selectedRows = new ArrayList<Integer>();

        /**

         * The context menu for the selected file.

         */

        final DnDFocusPanel contextMenu;

        /**

         * Specifies that the images available for this composite will be the ones

         * available in FileContextMenu.

         */

        public interface Images extends FileContextMenu.Images, Folders.Images {

                @Resource("gr/ebs/gss/resources/blank.gif")

                AbstractImagePrototype blank();

                @Resource("gr/ebs/gss/resources/asc.png")

                AbstractImagePrototype asc();

                @Resource("gr/ebs/gss/resources/desc.png")

                AbstractImagePrototype desc();

        }

        /**

         * A label with the number of files in this folder.

         */

        private HTML countLabel = new HTML();

        /**

         * The table widget with the file list.

         */

        private Grid table;

        /**

         * The navigation bar for paginating the results.

         */

        private HorizontalPanel navBar = new HorizontalPanel();

        /**

         * The number of files in the search results

         */

        private int folderFileCount;

        /**

         * Total search results size

         */

        private long folderTotalSize;

        /**

         * A cache of the files in the list.

         */

        private List<FileResource> files;

        /**

         * The widget's image bundle.

         */

        private final Images images;

        private String sortingProperty = "name";

        private boolean sortingType = true;

        private HTML nameLabel;

        private HTML versionLabel;

        private HTML sizeLabel;

        private HTML dateLabel;

        private HTML ownerLabel;

        private HTML pathLabel;

        private HTML searchResults = new HTML("Results for search:");

        /**

         * Construct the file list widget. This entails setting up the widget

         * layout, fetching the number of files in the current folder from the

         * server and filling the local file cache of displayed files with data from

         * the server, as well.

         *

         * @param _images

         */

        public SearchResults(final Images _images) {

                images = _images;

                final GSS app = GSS.get();

                table = new Grid(GSS.VISIBLE_FILE_COUNT + 1, 8) {

                        @Override

                        public void onBrowserEvent(Event event) {

                                if (files == null || files.size() == 0)

                                        return;

                                if (DOM.eventGetType(event) == Event.ONCONTEXTMENU && selectedRows.size() != 0) {

                                        FileContextMenu fm = new FileContextMenu(images, false, false);

                                        fm.onClick(contextMenu);

                                }

                                else if (DOM.eventGetType(event) == Event.ONDBLCLICK)

                                        if(getSelectedFiles().size() == 1){

                                                FileResource file = getSelectedFiles().get(0);

                                                String dateString = RestCommand.getDate();

                                                String resource = file.getUri().substring(app.getApiPath().length()-1,file.getUri().length());

                                                String sig = app.getCurrentUserResource().getUsername()+" "+RestCommand.calculateSig("GET", dateString, resource, RestCommand.base64decode(GSS.get().getToken()));

                                                Window.open(file.getUri() + "?Authorization=" + URL.encodeComponent(sig) + "&Date="+URL.encodeComponent(dateString), "_blank", "");

                                        }

                                if (DOM.eventGetType(event) == Event.ONCLICK) {

                                        if (DOM.eventGetCtrlKey(event))

                                                clickControl = true;

                                        else

                                                clickControl = false;

                                        if (DOM.eventGetShiftKey(event)) {

                                                clickShift = true;

                                                if (selectedRows.size() == 1)

                                                        firstShift = selectedRows.get(0) - startIndex;

                                                //event.preventDefault();

                                        } else {

                                                clickShift = false;

                                                firstShift = -1;

                                                //event.preventDefault();

                                        }

                                }

                                super.onBrowserEvent(event);

                        }

                };

                prevButton.addClickListener(this);

                nextButton.addClickListener(this);

                contextMenu = new DnDFocusPanel(new HTML(images.fileContextMenu().getHTML()));

                contextMenu.addClickListener(new FileContextMenu(images, false, false));

                app.getDragController().makeDraggable(contextMenu);

                // Setup the table.

                table.setCellSpacing(0);

                table.setCellPadding(2);

                table.setWidth("100%");

                // Hook up events.

                table.addTableListener(this);

                // Create the 'navigation' bar at the upper-right.

                HorizontalPanel innerNavBar = new HorizontalPanel();

                innerNavBar.setStyleName("gss-ListNavBar");

                innerNavBar.setSpacing(8);

                innerNavBar.add(prevButton);

                innerNavBar.add(countLabel);

                innerNavBar.add(nextButton);

                navBar.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);

                navBar.add(innerNavBar);

                navBar.setWidth("100%");

                VerticalPanel vp = new VerticalPanel();

                vp.add(searchResults);

                searchResults.addStyleName("gss-searchlabel");

                vp.add(table);

                initWidget(vp);

                table.setStyleName("gss-List");

                initTable();

                DeferredCommand.addCommand(new IncrementalCommand() {

                        public boolean execute() {

                                return fetchRootFolder();

                        }

                });

                table.sinkEvents(Event.ONCONTEXTMENU);

                table.sinkEvents(Event.ONMOUSEUP);

                table.sinkEvents(Event.ONCLICK);

                table.sinkEvents(Event.ONKEYDOWN);

                table.sinkEvents(Event.ONDBLCLICK);

                preventIESelection();

        }

        public void onClick(Widget sender) {

                if (sender == nextButton) {

                        // Move forward a page.

                        clearSelectedRows();

                        startIndex += GSS.VISIBLE_FILE_COUNT;

                        if (startIndex >= folderFileCount)

                                startIndex -= GSS.VISIBLE_FILE_COUNT;

                        else

                                update(false);

                } else if (sender == prevButton) {

                        clearSelectedRows();

                        // Move back a page.

                        startIndex -= GSS.VISIBLE_FILE_COUNT;

                        if (startIndex < 0)

                                startIndex = 0;

                        else

                                update(false);

                }

        }

        /**

         * Retrieve the root folder for the current user.

         *

         * @return true if the retrieval was successful

         */

        protected boolean fetchRootFolder() {

                UserResource user = GSS.get().getCurrentUserResource();

                if (user == null)

                        return !DONE;

                updateFileCache("");

                return DONE;

        }

        public void onCellClicked(SourcesTableEvents sender, int row, int cell) {

                // Select the row that was clicked (-1 to account for header row).

                if (row > folderFileCount)

                        return;

                if (clickShift) {

                        GWT.log("ROW is:" + row + " fs:" + firstShift, null);

                        if (firstShift == -1)

                                firstShift = row;

                        else if (row > firstShift) {

                                clearSelectedRows();

                                for (int i = firstShift; i < row; i++) {

                                        selectedRows.add(startIndex + i);

                                        styleRow(i, true);

                                }

                                GSS.get().setCurrentSelection(getSelectedFiles());

                                //contextMenu.setFiles(getSelectedFiles());

                                table.setWidget(row, 0, contextMenu);

                        } else if (row != -1 && row == firstShift) {

                                selectedRows.add(row);

                                selectedRows.add(row - 1);

                                styleRow(row, true);

                                styleRow(row - 1, true);

                        } else if (row < firstShift) {

                                GWT.log("ROW is:" + row + " fs:" + firstShift, null);

                                clearSelectedRows();

                                for (int i = firstShift; i >= row - 1; i--) {

                                        selectedRows.add(startIndex + i);

                                        styleRow(i, true);

                                }

                                GSS.get().setCurrentSelection(getSelectedFiles());

                                table.setWidget(row, 0, contextMenu);

                                //contextMenu.setFiles(getSelectedFiles());

                        }

                } else if (row > 0)

                        selectRow(row - 1);

        }

        /**

         * Initializes the table so that it contains enough rows for a full page of

         * files.

         */

        private void initTable() {

                nameLabel = new HTML("Name");

                nameLabel.addClickListener(new ClickListener() {

                        public void onClick(Widget sender) {

                                sortFiles("name");

                        }

                });

                versionLabel = new HTML("Version");

                versionLabel.addClickListener(new ClickListener() {

                        public void onClick(Widget sender) {

                                sortFiles("version");

                        }

                });

                sizeLabel = new HTML("Size");

                sizeLabel.addClickListener(new ClickListener() {

                        public void onClick(Widget sender) {

                                sortFiles("size");

                        }

                });

                dateLabel = new HTML("Last modified");

                dateLabel.addClickListener(new ClickListener() {

                        public void onClick(Widget sender) {

                                sortFiles("date");

                        }

                });

                ownerLabel = new HTML("Owner");

                ownerLabel.addClickListener(new ClickListener() {

                        public void onClick(Widget sender) {

                                sortFiles("owner");

                        }

                });

                pathLabel = new HTML("Path");

                pathLabel.addClickListener(new ClickListener() {

                        public void onClick(Widget sender) {

                                sortFiles("path");

                        }

                });

                // Create the header row.

                table.setText(0, 0, "");

                // table.setText(0, 1, "Name");

                table.setWidget(0, 1, nameLabel);

                table.setWidget(0, 2, ownerLabel);

                // table.setText(0, 3, "Version");

                table.setWidget(0, 3, pathLabel);

                table.setWidget(0, 4, versionLabel);

                // table.setText(0, 4, "Size");

                table.setWidget(0, 5, sizeLabel);

                // table.setText(0, 5, "Last modified");

                table.setWidget(0, 6, dateLabel);

                table.setWidget(0, 7, navBar);

                table.getRowFormatter().setStyleName(0, "gss-ListHeader");

                // Initialize the rest of the rows.

                for (int i = 1; i < GSS.VISIBLE_FILE_COUNT + 1; ++i) {

                        table.setText(i, 0, "");

                        table.setText(i, 1, "");

                        table.setText(i, 2, "");

                        table.setText(i, 3, "");

                        table.setText(i, 4, "");

                        table.setText(i, 5, "");

                        table.setText(i, 6, "");

                        table.getCellFormatter().setWordWrap(i, 0, false);

                        table.getCellFormatter().setWordWrap(i, 1, false);

                        table.getCellFormatter().setWordWrap(i, 2, false);

                        table.getCellFormatter().setWordWrap(i, 3, false);

                        table.getCellFormatter().setWordWrap(i, 4, false);

                        table.getCellFormatter().setWordWrap(i, 5, false);

                        table.getCellFormatter().setWordWrap(i, 6, false);

                        table.getCellFormatter().setHorizontalAlignment(i, 4, HasHorizontalAlignment.ALIGN_CENTER);

                }

                prevButton.setVisible(false);

                nextButton.setVisible(false);

        }

        /**

         * Selects the given row (relative to the current page).

         *

         * @param row the row to be selected

         */

        private void selectRow(final int row) {

                if (row < folderFileCount) {

                        if (clickControl)

                                if (selectedRows.contains(row)) {

                                        int i = selectedRows.indexOf(startIndex + row);

                                        selectedRows.remove(i);

                                        styleRow(row, false);

                                } else {

                                        for (int r : selectedRows) {

                                                int prow = r - startIndex;

                                                table.setWidget(prow + 1, 0, images.document().createImage());

                                        }

                                        selectedRows.add(startIndex + row);

                                        styleRow(row, true);

                                }

                        else {

                                clearSelectedRows();

                                selectedRows.add(startIndex + row);

                                styleRow(row, true);

                        }

                        if (selectedRows.size() == 1)

                                GSS.get().setCurrentSelection(files.get(selectedRows.get(0)));

                        else

                                GSS.get().setCurrentSelection(getSelectedFiles());

                        //contextMenu.setFiles(getSelectedFiles());

                        table.setWidget(row + 1, 0, contextMenu);

                }

        }

        public List<FileResource> getSelectedFiles() {

                List<FileResource> result = new ArrayList();

                for (int i : selectedRows)

                        result.add(files.get(i));

                return result;

        }

        /**

         * Make the specified row look like selected or not, according to the

         * <code>selected</code> flag.

         *

         * @param row

         * @param selected

         */

        void styleRow(final int row, final boolean selected) {

                if (row != -1 && row >= 0)

                        if (selected)

                                table.getRowFormatter().addStyleName(row + 1, "gss-SelectedRow");

                        else

                                table.getRowFormatter().removeStyleName(row + 1, "gss-SelectedRow");

        }

        /**

         * Update the display of the file list.

         */

        void update(boolean sort) {

                int count = folderFileCount;

                int max = startIndex + GSS.VISIBLE_FILE_COUNT;

                if (max > count)

                        max = count;

                folderTotalSize = 0;

                if (sort && files != null && files.size() != 0) {

                        clearLabels();

                        clearSelectedRows();

                        Collections.sort(files, new Comparator<FileResource>() {

                                public int compare(FileResource arg0, FileResource arg1) {

                                        if (sortingType)

                                                if (sortingProperty.equals("version")) {

                                                        versionLabel.setHTML("Version " + images.desc().getHTML());

                                                        return arg0.getVersion().compareTo(arg1.getVersion());

                                                } else if (sortingProperty.equals("owner")) {

                                                        ownerLabel.setHTML("Owner " + images.desc().getHTML());

                                                        return arg0.getOwner().compareTo(arg1.getOwner());

                                                } else if (sortingProperty.equals("date")) {

                                                        dateLabel.setHTML("Last modified " + images.desc().getHTML());

                                                        return arg0.getModificationDate().compareTo(arg1.getModificationDate());

                                                } else if (sortingProperty.equals("size")) {

                                                        sizeLabel.setHTML("Size " + images.desc().getHTML());

                                                        return arg0.getContentLength().compareTo(arg1.getContentLength());

                                                } else if (sortingProperty.equals("name")) {

                                                        nameLabel.setHTML("Name " + images.desc().getHTML());

                                                        return arg0.getName().compareTo(arg1.getName());

                                                } else if (sortingProperty.equals("path")) {

                                                        pathLabel.setHTML("Path " + images.desc().getHTML());

                                                        return arg0.getUri().compareTo(arg1.getUri());

                                                } else {

                                                        nameLabel.setHTML("Name " + images.desc().getHTML());

                                                        return arg0.getName().compareTo(arg1.getName());

                                                }

                                        else if (sortingProperty.equals("version")) {

                                                versionLabel.setHTML("Version " + images.asc().getHTML());

                                                return arg1.getVersion().compareTo(arg0.getVersion());

                                        } else if (sortingProperty.equals("owner")) {

                                                ownerLabel.setHTML("Owner " + images.asc().getHTML());

                                                return arg1.getOwner().compareTo(arg0.getOwner());

                                        } else if (sortingProperty.equals("date")) {

                                                dateLabel.setHTML("Last modified " + images.asc().getHTML());

                                                return arg1.getModificationDate().compareTo(arg0.getModificationDate());

                                        } else if (sortingProperty.equals("size")) {

                                                sizeLabel.setHTML("Size " + images.asc().getHTML());

                                                return arg1.getContentLength().compareTo(arg0.getContentLength());

                                        } else if (sortingProperty.equals("name")) {

                                                nameLabel.setHTML("Name " + images.asc().getHTML());

                                                return arg1.getName().compareTo(arg0.getName());

                                        } else if (sortingProperty.equals("path")) {

                                                pathLabel.setHTML("Path " + images.asc().getHTML());

                                                return arg1.getUri().compareTo(arg0.getUri());

                                        } else {

                                                nameLabel.setHTML("Name " + images.asc().getHTML());

                                                return arg1.getName().compareTo(arg0.getName());

                                        }

                                }

                        });

                }

                // Show the selected files.

                int i = 1;

                for (; i < GSS.VISIBLE_FILE_COUNT + 1; ++i) {

                        // Don't read past the end.

                        // if (i > folderFileCount)

                        // break;

                        if (startIndex + i > folderFileCount)

                                break;

                        // Add a new row to the table, then set each of its columns to the

                        // proper values.

                        table.setWidget(i, 0, images.document().createImage());

                        FileResource fileHeader = files.get(startIndex + i - 1);

                        table.getRowFormatter().addStyleName(i, "gss-fileRow");

                        table.setHTML(i, 1, fileHeader.getName());

                        table.setText(i, 2, fileHeader.getOwner());

                        table.setText(i, 3, fileHeader.getPath());

                        table.setText(i, 4, String.valueOf(fileHeader.getVersion()));

                        table.setText(i, 5, String.valueOf(fileHeader.getFileSizeAsString()));

                        final DateTimeFormat formatter = DateTimeFormat.getFormat("d/M/yyyy h:mm a");

                        table.setText(i, 6, formatter.format(fileHeader.getModificationDate()));

                        folderTotalSize += fileHeader.getContentLength();

                }

                // Clear any remaining slots.

                for (; i < GSS.VISIBLE_FILE_COUNT + 1; ++i) {

                        table.setHTML(i, 0, " ");

                        table.setHTML(i, 1, " ");

                        table.setHTML(i, 2, " ");

                        table.setHTML(i, 3, " ");

                        table.setHTML(i, 4, " ");

                        table.setHTML(i, 5, " ");

                        table.setHTML(i, 6, " ");

                        table.setHTML(i, 7, " ");

                }

                if (folderFileCount == 0) {

                        showingStats = "no files";

                        prevButton.setVisible(false);

                        nextButton.setVisible(false);

                } else if (folderFileCount < GSS.VISIBLE_FILE_COUNT) {

                        if (folderFileCount == 1)

                                showingStats = "1 file";

                        else

                                showingStats = folderFileCount + " files";

                        showingStats += " (" + FileResource.getFileSizeAsString(folderTotalSize) + ")";

                        prevButton.setVisible(false);

                        nextButton.setVisible(false);

                } else {

                        showingStats = "" + (startIndex + 1) + " - " + max + " of " + count + " files" + " (" + FileResource.getFileSizeAsString(folderTotalSize) + ")";

                        prevButton.setVisible(startIndex != 0);

                        nextButton.setVisible(startIndex + GSS.VISIBLE_FILE_COUNT < count);

                }

                updateCurrentlyShowingStats();

        }

        /**

         *  update status panel with currently showing file stats

         */

        public void updateCurrentlyShowingStats() {

                GSS.get().getStatusPanel().updateCurrentlyShowing(showingStats);

        }

        /**

         * Adjust the height of the table by adding and removing rows as necessary.

         *

         * @param newHeight the new height to reach

         */

        void resizeTableHeight(final int newHeight) {

                GWT.log("Panel: " + newHeight + ", parent: " + table.getParent().getOffsetHeight(), null);

                // Fill the rest with empty slots.

                if (newHeight > table.getOffsetHeight())

                        while (newHeight > table.getOffsetHeight()) {

                                // table.setHTML(table.getRowCount(), 5, " ");

                                table.resizeRows(table.getRowCount() + 1);

                                GWT.log("Table: " + table.getOffsetHeight() + ", rows: " + table.getRowCount(), null);

                        }

                else

                        while (newHeight < table.getOffsetHeight()) {

                                // table.setHTML(table.getRowCount(), 5, " ");

                                table.resizeRows(table.getRowCount() - 1);

                                GWT.log("Table: " + table.getOffsetHeight() + ", rows: " + table.getRowCount(), null);

                        }

        }

        /**

         * Update the file cache with data from the server.

         */

        public void updateFileCache(String query) {

                final GSS app = GSS.get();

                clearSelectedRows();

                clearLabels();

                startIndex = 0;

                app.showLoadingIndicator();

                if (query == null || query.trim().equals("")) {

                        searchResults.setHTML("You must specify a query");

                        setFiles(new ArrayList());

                        update(true);

                        app.hideLoadingIndicator();

                } else{

                        searchResults.setHTML("Search results for " + query);

                        GetCommand<SearchResource> eg = new GetCommand<SearchResource>(SearchResource.class,

                                                app.getApiPath() + "search/" + URL.encodeComponent(query)) {

                                @Override

                                public void onComplete() {

                                        SearchResource s = getResult();

                                        setFiles(s.getFiles());

                                        update(true);

                                }

                                @Override

                                public void onError(Throwable t) {

                                        if(t instanceof RestException)

                                                app.displayError("Unable to perform search:"+((RestException)t).getHttpStatusText());

                                        else

                                                app.displayError("System error performing search:"+t.getMessage());

                                        updateFileCache("");

                                }

                        };

                        DeferredCommand.addCommand(eg);

                }

        }

        /**

         * Fill the file cache with data.

         *

         * @param _files

         * @param filePaths the files to set

         */

        private void setFiles(List<FileResource> _files) {

                files = _files;

                Collections.sort(files, new Comparator<FileResource>() {

                        public int compare(FileResource arg0, FileResource arg1) {

                                return arg0.getName().compareTo(arg1.getName());

                        }

                });

                folderFileCount = files.size();

                GWT.log("File count:" + folderFileCount, null);

        }

        private void sortFiles(final String sortProperty) {

                if (sortProperty.equals(sortingProperty))

                        sortingType = !sortingType;

                else {

                        sortingProperty = sortProperty;

                        sortingType = true;

                }

                update(true);

        }

        private void clearLabels() {

                nameLabel.setText("Name");

                versionLabel.setText("Version");

                sizeLabel.setText("Size");

                dateLabel.setText("Last modified");

                ownerLabel.setText("Owner");

                pathLabel.setText("Path");

        }

        /**

         * Retrieve the table.

         *

         * @return the table

         */

        Grid getTable() {

                return table;

        }

        /**

         * Does the list contains the requested filename

         *

         * @param fileName

         * @return true/false

         */

        public boolean contains(String fileName) {

                for (int i = 0; i < files.size(); i++)

                        if (files.get(i).getName().equals(fileName))

                                return true;

                return false;

        }

        public void clearSelectedRows() {

                for (int r : selectedRows) {

                        int row = r - startIndex;

                        styleRow(row, false);

                        table.setWidget(row + 1, 0, images.document().createImage());

                }

                selectedRows.clear();

                Object sel = GSS.get().getCurrentSelection();

                if (sel instanceof FileResource || sel instanceof List)

                        GSS.get().setCurrentSelection(null);

        }

        public static native void preventIESelection() /*-{

             $doc.body.onselectstart = function () { return false; };

         }-*/;

        public static native void enableIESelection() /*-{

         if ($doc.body.onselectstart != null)

             $doc.body.onselectstart = null;

         }-*/;

        public void selectAllRows() {

                clearSelectedRows();

                int count = folderFileCount;

                if (count == 0)

                        return;

                int max = startIndex + GSS.VISIBLE_FILE_COUNT;

                if (max > count)

                        max = count;

                int i = 1;

                for (; i < GSS.VISIBLE_FILE_COUNT + 1; ++i) {

                        // Don't read past the end.

                        // if (i > folderFileCount)

                        // break;

                        if (startIndex + i > folderFileCount)

                                break;

                        selectedRows.add(startIndex + i - 1);

                        styleRow(i - 1, true);

                }

                GSS.get().setCurrentSelection(getSelectedFiles());

                //contextMenu.setFiles(getSelectedFiles());

                table.setWidget(i - 1, 0, contextMenu);

        }

}