Java tutorial
/* * 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; }