Metacat

/*

 * Copyright 2006 Google Inc.

 * 

 * Licensed under the Apache License, Version 2.0 (the "License"); you may not

 * use this file except in compliance with the License. You may obtain a copy of

 * the License at

 * 

 * http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

 * License for the specific language governing permissions and limitations under

 * the License.

 */

package org.kepler.web.client;

import org.kepler.web.client.DynaTableDataProvider.RowDataAcceptor;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

public class DynaTableWidget extends Composite implements TableListener{

  private class NavBar extends Composite implements ClickListener {

    public NavBar() {

      initWidget(bar);

      bar.setStyleName("navbar");

      status.setStyleName("status");

      HorizontalPanel searchPanel = new HorizontalPanel();

      searchField.setVisibleLength(12);

      searchButton.setStyleName("searchButton");

      searchPanel.add(searchField);

      searchPanel.add(searchButton);

      HorizontalPanel buttons = new HorizontalPanel();

      buttons.add(gotoFirst);

      buttons.add(gotoPrev);

      buttons.add(gotoNext);

      buttons.add(gotoLast);

      bar.add(buttons, DockPanel.EAST);

      bar.setCellHorizontalAlignment(buttons, DockPanel.ALIGN_RIGHT);

      HorizontalPanel statusPanel = new HorizontalPanel();

      statusPanel.add(statusImage);

      statusPanel.add(new HTML("  "));

      statusPanel.add(status);

      bar.add(statusPanel, DockPanel.CENTER);

      bar.setVerticalAlignment(DockPanel.ALIGN_MIDDLE);

      bar.setCellHorizontalAlignment(statusPanel, HasAlignment.ALIGN_RIGHT);

      bar.setCellVerticalAlignment(statusPanel, HasAlignment.ALIGN_MIDDLE);

      bar.setCellWidth(statusPanel, "100%");

      bar.add(searchPanel, DockPanel.WEST);

      // Initialize prev & first button to disabled.

      //

      gotoPrev.setEnabled(false);

      gotoFirst.setEnabled(false);

    }

    public void onClick(Widget sender) {

      if (sender == gotoNext) {

        startRow += getDataRowCount();

        selectRow(-1);

        refresh();

      } else if (sender == gotoPrev) {

        startRow -= getDataRowCount();

        if (startRow < 0) {

          startRow = 0;

        }

        selectRow(-1);

        refresh();

      } else if (sender == gotoFirst) {

        startRow = 0;

        selectRow(-1);

        refresh();

      } else if (sender == gotoLast) {

        startRow = getMaxRowCount() - (getMaxRowCount() % getRowInc());

        selectRow(-1);

        refresh();

      } else if(sender == searchButton) {

        searchString = searchField.getText();

        startRow = 0;

        selectRow(-1);

        search(searchField.getText());

      }

    }

    public final DockPanel bar = new DockPanel();

    public final Button gotoFirst = new Button("<<", this);

    public final Button gotoNext = new Button(">", this);

    public final Button gotoPrev = new Button("<", this);

    public final Button gotoLast = new Button(">>", this);

    public final Button searchButton = new Button("Search", this);

    public final TextBox searchField = new TextBox();

    public final HTML status = new HTML();

    public final Image statusImage = new Image("spinner-anim.gif");

  }

  private class RowDataAcceptorImpl implements RowDataAcceptor {

    public void accept(int startRow, String[][] data) {

      int destRowCount = getDataRowCount();

      int destColCount = grid.getCellCount(0);

      assert (data.length <= destRowCount) : "Too many rows";

      int srcRowIndex = 0;

      int srcRowCount = data.length;

      int destRowIndex = 1; // skip navbar row

      for (; srcRowIndex < srcRowCount; ++srcRowIndex, ++destRowIndex) {

        String[] srcRowData = data[srcRowIndex];

        assert (srcRowData.length == destColCount) : " Column count mismatch";

        for (int srcColIndex = 0; srcColIndex < destColCount; ++srcColIndex) {

          String cellHTML = srcRowData[srcColIndex];

          grid.setText(destRowIndex, srcColIndex, cellHTML);

          grid.getCellFormatter().setStyleName(destRowIndex, 0, "infoIcon");

        }

      }

      // Clear remaining table rows.

      //

      boolean isLastPage = false;

      for (; destRowIndex < destRowCount + 1; ++destRowIndex) {

        isLastPage = true;

        for (int destColIndex = 0; destColIndex < destColCount; ++destColIndex) {

          grid.clearCell(destRowIndex, destColIndex);

        }

      }

      // Synchronize the nav buttons.

      //

      navbar.gotoNext.setEnabled(!isLastPage);

      navbar.gotoFirst.setEnabled(startRow > 0);

      navbar.gotoPrev.setEnabled(startRow > 0);

      navbar.gotoLast.setEnabled(!isLastPage);

      // Update the status message.

      //

      setStatusText((startRow + 1) + " - " + (startRow + srcRowCount) + " of " + 

        getMaxRowCount());

      setStatusImage(false);

      currentEndRecordNum = startRow + srcRowCount;

      currentBeginRecordNum = startRow + 1;

    }

    public void failed(Throwable caught) {

      String msg = "Failed to access data";

      if (caught != null) {

        msg += ": " + caught.getMessage();

      }

      setStatusText(msg);

    }

  }

  private static class InfoDialog extends DialogBox implements ClickListener {

    public InfoDialog(String title, String docid) {

      setText(title);

      Frame iframe = new Frame("http://library.kepler-project.org/kepler/metacat?action=read&docid=" + docid + "&qformat=kepler");

      Button closeButton = new Button("Close", this);

      /*HTML msg = new HTML(

        "<center>This is an example of a standard dialog box component.<br>  "

          + "You can put pretty much anything you like into it,<br>such as the "

          + "following IFRAME:</center>", true);*/

      DockPanel dock = new DockPanel();

      dock.setSpacing(4);

      dock.add(closeButton, DockPanel.SOUTH);

      //dock.add(msg, DockPanel.NORTH);

      dock.add(iframe, DockPanel.CENTER);

      dock.setCellHorizontalAlignment(closeButton, DockPanel.ALIGN_RIGHT);

      dock.setCellWidth(iframe, "100%");

      dock.setWidth("100%");

      iframe.setWidth("80em");

      iframe.setHeight("50em");

      setWidget(dock);

    }

    public void onClick(Widget sender) {

      hide();

    }

  }

  public DynaTableWidget(DynaTableDataProvider provider, String[] columns,

      String[] columnStyles, int rowCount) {

    rowInc = rowCount;

    if (columns.length == 0) {

      throw new IllegalArgumentException(

        "expecting a positive number of columns");

    }

    if (columnStyles != null && columns.length != columnStyles.length) {

      throw new IllegalArgumentException("expecting as many styles as columns");

    }

    this.provider = provider;

    initWidget(outer);

    grid.setStyleName("table");

    grid.addTableListener(this);

    outer.add(navbar, DockPanel.NORTH);

    outer.add(grid, DockPanel.CENTER);

    initTable(columns, columnStyles, rowCount);

    setStyleName("DynaTable-DynaTableWidget");

  }

  private void initTable(String[] columns, String[] columnStyles, int rowCount) {

    // Set up the header row.  It's one greater than the number of visible rows.

    //

    grid.resize(rowCount+1, columns.length);

    for (int i = 0, n = columns.length; i < n; i++) {

      grid.setText(0, i, columns[i]);

      if (columnStyles != null) {

        grid.getCellFormatter().setStyleName(0, i, columnStyles[i] + " header");

      }

    }

  }

  public void setStatusText(String text) {

    navbar.status.setText(text);

  }

  public void clearStatusText() {

    navbar.status.setHTML(" ");

  }

  public void setStatusImage(boolean on)

  {

    //if on turn the image on

    navbar.statusImage.setVisible(on);

  }

  public void refresh() {

    // Disable buttons temporarily to stop the user from running off the end.

    //

    search(searchString);

  }

  public void search(String searchTerm) {

    navbar.gotoFirst.setEnabled(false);

    navbar.gotoPrev.setEnabled(false);

    navbar.gotoNext.setEnabled(false);

    navbar.gotoLast.setEnabled(false);

    setStatusText("Searching...");

    setStatusImage(true);

    provider.updateRowData(startRow, grid.getRowCount() - 1, acceptor, searchTerm);

    for(int i=0; i<grid.getRowCount(); i++)

    {

      if(grid.getText(i, 1) == null || 

         grid.getText(i, 1).trim().equals("") || 

         grid.getHTML(i,1).equals(" "))

      { //remove the info icon style if there is nothing in the row

        grid.getCellFormatter().removeStyleName(i, 0, "infoIcon");

      }

    }

  }

  public void setRowCount(int rows) {

    grid.resizeRows(rows);

  }

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

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

    if(((row + currentBeginRecordNum) - 2) < currentEndRecordNum)

    {

      if (row > 0)

      {

        selectRow(row - 1);

      }

      if(cell == 0)

      {

        //create the dialog and send the name and docid to the dialog

        DialogBox dlg = new InfoDialog(grid.getText(row,1), grid.getText(row,2));

        int left = 50;

        int top = 50;

        dlg.setPopupPosition(left, top);

        dlg.show();

      }

    }

  }

  /**

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

   * 

   * @param row the row to be selected

   */

  private void selectRow(int row) {

    styleRow(selectedRow, false);

    styleRow(row, true);

    selectedRow = row;

  }

  private void styleRow(int row, boolean selected) {

    if (row != -1) {

      if (selected)

      {

        //grid.getRowFormatter().addStyleName(row + 1, "SelectedRow");

        //don't select the info icon

        grid.getCellFormatter().setStyleName(row + 1, 1, "SelectedRow");

        grid.getCellFormatter().setStyleName(row + 1, 2, "SelectedRow");

      }

      else

      {

        //grid.getRowFormatter().removeStyleName(row + 1, "SelectedRow");

        grid.getCellFormatter().removeStyleName(row + 1, 1, "SelectedRow");

        grid.getCellFormatter().removeStyleName(row + 1, 2, "SelectedRow");

      }

    }

  }

  private int getDataRowCount() {

    return grid.getRowCount() - 1;

  }

  public int getMaxRowCount() {

    return maxRowCount;

  }

  public void setMaxRowCount(int max) {

    maxRowCount = max;

  }

  private int getRowInc() {

    return rowInc;

  }

  private final RowDataAcceptor acceptor = new RowDataAcceptorImpl();

  private final NavBar navbar = new NavBar();

  private final DockPanel outer = new DockPanel();

  private final DynaTableDataProvider provider;

  private int startRow = 0;

  private Grid grid = new Grid();

  private int maxRowCount = 0;

  private int rowInc;

  private int currentEndRecordNum = -1;

  private int currentBeginRecordNum = -1;

  private String searchString = null;

  private int startIndex, selectedRow = -1;

}