samples/dynatable/src/com/google/gwt/sample/dynatable/client/DynaTableWidget.java - gwt - Git at Google

 /*
  * Copyright 2007 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 com.google.gwt.sample.dynatable.client;

 import com.google.gwt.event.dom.client.ClickEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.sample.dynatable.client.DynaTableDataProvider.RowDataAcceptor;
 import com.google.gwt.user.client.rpc.InvocationException;
 import com.google.gwt.user.client.ui.Button;
 import com.google.gwt.user.client.ui.Composite;
 import com.google.gwt.user.client.ui.DialogBox;
 import com.google.gwt.user.client.ui.DockPanel;
 import com.google.gwt.user.client.ui.Grid;
 import com.google.gwt.user.client.ui.HTML;
 import com.google.gwt.user.client.ui.HasAlignment;
 import com.google.gwt.user.client.ui.HorizontalPanel;
 import com.google.gwt.user.client.ui.VerticalPanel;

 /**
  * A composite Widget that implements the main interface for the dynamic table,
  * including the data table, status indicators, and paging buttons.
  */
 public class DynaTableWidget extends Composite {

   /**
    * A dialog box for displaying an error.
    */
   private static class ErrorDialog extends DialogBox implements ClickHandler {
     private HTML body = new HTML("");

     public ErrorDialog() {
       setStylePrimaryName("DynaTable-ErrorDialog");
       Button closeButton = new Button("Close", this);
       VerticalPanel panel = new VerticalPanel();
       panel.setSpacing(4);
       panel.add(body);
       panel.add(closeButton);
       panel.setCellHorizontalAlignment(closeButton, VerticalPanel.ALIGN_RIGHT);
       setWidget(panel);
     }

     public String getBody() {
       return body.getHTML();
     }

     public void onClick(ClickEvent event) {
       hide();
     }

     public void setBody(String html) {
       body.setHTML(html);
     }
   }

   private class NavBar extends Composite implements ClickHandler {

     public final DockPanel bar = new DockPanel();
     public final Button gotoFirst = new Button("&lt;&lt;", this);
     public final Button gotoNext = new Button("&gt;", this);
     public final Button gotoPrev = new Button("&lt;", this);
     public final HTML status = new HTML();

     public NavBar() {
       initWidget(bar);
       bar.setStyleName("navbar");
       status.setStyleName("status");

       HorizontalPanel buttons = new HorizontalPanel();
       buttons.add(gotoFirst);
       buttons.add(gotoPrev);
       buttons.add(gotoNext);
       bar.add(buttons, DockPanel.EAST);
       bar.setCellHorizontalAlignment(buttons, DockPanel.ALIGN_RIGHT);
       bar.add(status, DockPanel.CENTER);
       bar.setVerticalAlignment(DockPanel.ALIGN_MIDDLE);
       bar.setCellHorizontalAlignment(status, HasAlignment.ALIGN_RIGHT);
       bar.setCellVerticalAlignment(status, HasAlignment.ALIGN_MIDDLE);
       bar.setCellWidth(status, "100%");

       // Initialize prev & first button to disabled.
       //
       gotoPrev.setEnabled(false);
       gotoFirst.setEnabled(false);
     }

     public void onClick(ClickEvent event) {
       Object source = event.getSource();
       if (source == gotoNext) {
         startRow += getDataRowCount();
         refresh();
       } else if (source == gotoPrev) {
         startRow -= getDataRowCount();
         if (startRow < 0) {
           startRow = 0;
         }
         refresh();
       } else if (source == gotoFirst) {
         startRow = 0;
         refresh();
       }
     }
   }

   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);
         }
       }

       // 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);

       // Update the status message.
       //
       setStatusText((startRow + 1) + " - " + (startRow + srcRowCount));
     }

     public void failed(Throwable caught) {
       setStatusText("Error");
       if (errorDialog == null) {
         errorDialog = new ErrorDialog();
       }
       if (caught instanceof InvocationException) {
         errorDialog.setText("An RPC server could not be reached");
         errorDialog.setBody(NO_CONNECTION_MESSAGE);
       } else {
         errorDialog.setText("Unexcepted Error processing remote call");
         errorDialog.setBody(caught.getMessage());
       }
       errorDialog.center();
     }
   }

   private static final String NO_CONNECTION_MESSAGE = "<p>The DynaTable example uses a <a "
       + "href=\"http://www.gwtproject.org/doc/latest/DevGuideServerCommunication.html"
       + "#DevGuideRemoteProcedureCalls\" target=\"_blank\">Remote Procedure Call</a> "
       + "(RPC) to request data from the server.  In order for the RPC to "
       + "successfully return data, the server component must be available.</p>"
       + "<p>If you are running this demo from compiled code, the server "
       + "component may not be available to respond to the RPC requests from "
       + "DynaTable.  Try running DynaTable in development mode to see the demo "
       + "in action.</p> "
       + "<p>Click on the Remote Procedure Call link above for more information "
       + "on GWT's RPC infrastructure.";

   private final RowDataAcceptor acceptor = new RowDataAcceptorImpl();

   private final Grid grid = new Grid();

   private final NavBar navbar = new NavBar();

   private ErrorDialog errorDialog = null;

   private final DockPanel outer = new DockPanel();

   private final DynaTableDataProvider provider;

   private int startRow = 0;

   public DynaTableWidget(DynaTableDataProvider provider, String[] columns,
       String[] columnStyles, int 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");
     outer.add(navbar, DockPanel.NORTH);
     outer.add(grid, DockPanel.CENTER);
     initTable(columns, columnStyles, rowCount);
     setStyleName("DynaTable-DynaTableWidget");
   }

   public void clearStatusText() {
     navbar.status.setHTML("&nbsp;");
   }

   public void refresh() {
     // Disable buttons temporarily to stop the user from running off the end.
     //
     navbar.gotoFirst.setEnabled(false);
     navbar.gotoPrev.setEnabled(false);
     navbar.gotoNext.setEnabled(false);

     setStatusText("Please wait...");
     provider.updateRowData(startRow, grid.getRowCount() - 1, acceptor);
   }

   public void setRowCount(int rows) {
     grid.resizeRows(rows);
   }

   public void setStatusText(String text) {
     navbar.status.setText(text);
   }

   private int getDataRowCount() {
     return grid.getRowCount() - 1;
   }

   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");
       }
     }
   }
 }
	/*
	* Copyright 2007 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 com.google.gwt.sample.dynatable.client;

	import com.google.gwt.event.dom.client.ClickEvent;
	import com.google.gwt.event.dom.client.ClickHandler;
	import com.google.gwt.sample.dynatable.client.DynaTableDataProvider.RowDataAcceptor;
	import com.google.gwt.user.client.rpc.InvocationException;
	import com.google.gwt.user.client.ui.Button;
	import com.google.gwt.user.client.ui.Composite;
	import com.google.gwt.user.client.ui.DialogBox;
	import com.google.gwt.user.client.ui.DockPanel;
	import com.google.gwt.user.client.ui.Grid;
	import com.google.gwt.user.client.ui.HTML;
	import com.google.gwt.user.client.ui.HasAlignment;
	import com.google.gwt.user.client.ui.HorizontalPanel;
	import com.google.gwt.user.client.ui.VerticalPanel;

	/**
	* A composite Widget that implements the main interface for the dynamic table,
	* including the data table, status indicators, and paging buttons.
	*/
	public class DynaTableWidget extends Composite {

	/**
	* A dialog box for displaying an error.
	*/
	private static class ErrorDialog extends DialogBox implements ClickHandler {
	private HTML body = new HTML("");

	public ErrorDialog() {
	setStylePrimaryName("DynaTable-ErrorDialog");
	Button closeButton = new Button("Close", this);
	VerticalPanel panel = new VerticalPanel();
	panel.setSpacing(4);
	panel.add(body);
	panel.add(closeButton);
	panel.setCellHorizontalAlignment(closeButton, VerticalPanel.ALIGN_RIGHT);
	setWidget(panel);
	}

	public String getBody() {
	return body.getHTML();
	}

	public void onClick(ClickEvent event) {
	hide();
	}

	public void setBody(String html) {
	body.setHTML(html);
	}
	}

	private class NavBar extends Composite implements ClickHandler {

	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 HTML status = new HTML();

	public NavBar() {
	initWidget(bar);
	bar.setStyleName("navbar");
	status.setStyleName("status");

	HorizontalPanel buttons = new HorizontalPanel();
	buttons.add(gotoFirst);
	buttons.add(gotoPrev);
	buttons.add(gotoNext);
	bar.add(buttons, DockPanel.EAST);
	bar.setCellHorizontalAlignment(buttons, DockPanel.ALIGN_RIGHT);
	bar.add(status, DockPanel.CENTER);
	bar.setVerticalAlignment(DockPanel.ALIGN_MIDDLE);
	bar.setCellHorizontalAlignment(status, HasAlignment.ALIGN_RIGHT);
	bar.setCellVerticalAlignment(status, HasAlignment.ALIGN_MIDDLE);
	bar.setCellWidth(status, "100%");

	// Initialize prev & first button to disabled.
	//
	gotoPrev.setEnabled(false);
	gotoFirst.setEnabled(false);
	}

	public void onClick(ClickEvent event) {
	Object source = event.getSource();
	if (source == gotoNext) {
	startRow += getDataRowCount();
	refresh();
	} else if (source == gotoPrev) {
	startRow -= getDataRowCount();
	if (startRow < 0) {
	startRow = 0;
	}
	refresh();
	} else if (source == gotoFirst) {
	startRow = 0;
	refresh();
	}
	}
	}

	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);
	}
	}

	// 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);

	// Update the status message.
	//
	setStatusText((startRow + 1) + " - " + (startRow + srcRowCount));
	}

	public void failed(Throwable caught) {
	setStatusText("Error");
	if (errorDialog == null) {
	errorDialog = new ErrorDialog();
	}
	if (caught instanceof InvocationException) {
	errorDialog.setText("An RPC server could not be reached");
	errorDialog.setBody(NO_CONNECTION_MESSAGE);
	} else {
	errorDialog.setText("Unexcepted Error processing remote call");
	errorDialog.setBody(caught.getMessage());
	}
	errorDialog.center();
	}
	}

	private static final String NO_CONNECTION_MESSAGE = "<p>The DynaTable example uses a <a "
	+ "href=\"http://www.gwtproject.org/doc/latest/DevGuideServerCommunication.html"
	+ "#DevGuideRemoteProcedureCalls\" target=\"_blank\">Remote Procedure Call</a> "
	+ "(RPC) to request data from the server. In order for the RPC to "
	+ "successfully return data, the server component must be available.</p>"
	+ "<p>If you are running this demo from compiled code, the server "
	+ "component may not be available to respond to the RPC requests from "
	+ "DynaTable. Try running DynaTable in development mode to see the demo "
	+ "in action.</p> "
	+ "<p>Click on the Remote Procedure Call link above for more information "
	+ "on GWT's RPC infrastructure.";

	private final RowDataAcceptor acceptor = new RowDataAcceptorImpl();

	private final Grid grid = new Grid();

	private final NavBar navbar = new NavBar();

	private ErrorDialog errorDialog = null;

	private final DockPanel outer = new DockPanel();

	private final DynaTableDataProvider provider;

	private int startRow = 0;

	public DynaTableWidget(DynaTableDataProvider provider, String[] columns,
	String[] columnStyles, int 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");
	outer.add(navbar, DockPanel.NORTH);
	outer.add(grid, DockPanel.CENTER);
	initTable(columns, columnStyles, rowCount);
	setStyleName("DynaTable-DynaTableWidget");
	}

	public void clearStatusText() {
	navbar.status.setHTML(" ");
	}

	public void refresh() {
	// Disable buttons temporarily to stop the user from running off the end.
	//
	navbar.gotoFirst.setEnabled(false);
	navbar.gotoPrev.setEnabled(false);
	navbar.gotoNext.setEnabled(false);

	setStatusText("Please wait...");
	provider.updateRowData(startRow, grid.getRowCount() - 1, acceptor);
	}

	public void setRowCount(int rows) {
	grid.resizeRows(rows);
	}

	public void setStatusText(String text) {
	navbar.status.setText(text);
	}

	private int getDataRowCount() {
	return grid.getRowCount() - 1;
	}

	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");
	}
	}
	}
	}