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/*
 * Copyright 2008 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.user.client.ui;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.FormElement;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeUri;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.impl.FormPanelImpl;
import com.google.gwt.user.client.ui.impl.FormPanelImplHost;

/**
 * A panel that wraps its contents in an HTML <FORM> element.
 *
 * 

* This panel can be used to achieve interoperability with servers that accept * traditional HTML form encoding. The following widgets (those that implement * {@link com.google.gwt.user.client.ui.HasName}) will be submitted to the * server if they are contained within this panel: *

    *
  • {@link com.google.gwt.user.client.ui.TextBox}
  • *
  • {@link com.google.gwt.user.client.ui.PasswordTextBox}
  • *
  • {@link com.google.gwt.user.client.ui.RadioButton}
  • *
  • {@link com.google.gwt.user.client.ui.SimpleRadioButton}
  • *
  • {@link com.google.gwt.user.client.ui.CheckBox}
  • *
  • {@link com.google.gwt.user.client.ui.SimpleCheckBox}
  • *
  • {@link com.google.gwt.user.client.ui.TextArea}
  • *
  • {@link com.google.gwt.user.client.ui.ListBox}
  • *
  • {@link com.google.gwt.user.client.ui.FileUpload}
  • *
  • {@link com.google.gwt.user.client.ui.Hidden}
  • *
* In particular, {@link com.google.gwt.user.client.ui.FileUpload} is * only useful when used within a FormPanel, because the browser will * only upload files using form submission. *

* *

*

Example

* {@example com.google.gwt.examples.FormPanelExample} *

*/ @SuppressWarnings("deprecation") public class FormPanel extends SimplePanel implements FiresFormEvents, FormPanelImplHost { /** * Fired when a form has been submitted successfully. */ public static class SubmitCompleteEvent extends GwtEvent { /** * The event type. */ private static Type TYPE; /** * Handler hook. * * @return the handler hook */ public static Type getType() { if (TYPE == null) { TYPE = new Type(); } return TYPE; } private String resultHtml; /** * Create a submit complete event. * * @param resultsHtml the results from submitting the form */ protected SubmitCompleteEvent(String resultsHtml) { this.resultHtml = resultsHtml; } @Override public final Type getAssociatedType() { return getType(); } /** * Gets the result text of the form submission. * * @return the result html, or null if there was an error * reading it * @tip The result html can be null as a result of submitting a * form to a different domain. */ public String getResults() { return resultHtml; } @Override protected void dispatch(SubmitCompleteHandler handler) { handler.onSubmitComplete(this); } } /** * Handler for {@link FormPanel.SubmitCompleteEvent} events. */ public interface SubmitCompleteHandler extends EventHandler { /** * Fired when a form has been submitted successfully. * * @param event the event */ void onSubmitComplete(FormPanel.SubmitCompleteEvent event); } /** * Fired when the form is submitted. */ public static class SubmitEvent extends GwtEvent { /** * The event type. */ private static Type TYPE; /** * Handler hook. * * @return the handler hook */ public static Type getType() { if (TYPE == null) { TYPE = new Type(); } return TYPE; } private boolean canceled = false; /** * Cancel the form submit. Firing this will prevent a subsequent * {@link FormPanel.SubmitCompleteEvent} from being fired. */ public void cancel() { this.canceled = true; } @Override public final Type getAssociatedType() { return getType(); } /** * Gets whether this form submit will be canceled. * * @return true if the form submit will be canceled */ public boolean isCanceled() { return canceled; } @Override protected void dispatch(FormPanel.SubmitHandler handler) { handler.onSubmit(this); } /** * This method is used for legacy support and should be removed when * {@link FormHandler} is removed. * * @deprecated Use {@link FormPanel.SubmitEvent#cancel()} instead */ @Deprecated void setCanceled(boolean canceled) { this.canceled = canceled; } } /** * Handler for {@link FormPanel.SubmitEvent} events. */ public interface SubmitHandler extends EventHandler { /** * Fired when the form is submitted. * *

* The FormPanel must not be detached (i.e. removed from its parent * or otherwise disconnected from a {@link RootPanel}) until the submission * is complete. Otherwise, notification of submission will fail. *

* * @param event the event */ void onSubmit(FormPanel.SubmitEvent event); } interface IFrameTemplate extends SafeHtmlTemplates { static final IFrameTemplate INSTANCE = GWT.create(IFrameTemplate.class); @Template("