# LoginView.java

    /*
    ** Module   : LoginView.java
    ** Abstract : LoginView represents a login form view.
    **
    ** Copyright (c) 2017, Golden Code Development Corporation.
    **
    ** -#- -I- --Date-- ----------------Description----------------------
    ** 001 HC  20170228 Created initial version.
    ** 002 SBI 20170531 Changed text controls to use gwtbootstrap3, fixed "Enter pressed" handlers.
    ** 003 EVL 20170926 Javadoc fix.
    */
    /*
    ** This program is free software: you can redistribute it and/or modify
    ** it under the terms of the GNU Affero General Public License as
    ** published by the Free Software Foundation, either version 3 of the
    ** License, or (at your option) any later version.
    **
    ** This program 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 Affero General Public License for more details.
    **
    ** You may find a copy of the GNU Affero GPL version 3 at the following
    ** location: https://www.gnu.org/licenses/agpl-3.0.en.html
    **
    ** Additional terms under GNU Affero GPL version 3 section 7:
    **
    **   Under Section 7 of the GNU Affero GPL version 3, the following additional
    **   terms apply to the works covered under the License.  These additional terms
    **   are non-permissive additional terms allowed under Section 7 of the GNU
    **   Affero GPL version 3 and may not be removed by you.
    **
    **   0. Attribution Requirement.
    **
    **     You must preserve all legal notices or author attributions in the covered
    **     work or Appropriate Legal Notices displayed by works containing the covered
    **     work.  You may not remove from the covered work any author or developer
    **     credit already included within the covered work.
    **
    **   1. No License To Use Trademarks.
    **
    **     This license does not grant any license or rights to use the trademarks
    **     Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
    **     of Golden Code Development Corporation. You are not authorized to use the
    **     name Golden Code, FWD, or the names of any author or contributor, for
    **     publicity purposes without written authorization.
    **
    **   2. No Misrepresentation of Affiliation.
    **
    **     You may not represent yourself as Golden Code Development Corporation or FWD.
    **
    **     You may not represent yourself for publicity purposes as associated with
    **     Golden Code Development Corporation, FWD, or any author or contributor to
    **     the covered work, without written authorization.
    **
    **   3. No Misrepresentation of Source or Origin.
    **
    **     You may not represent the covered work as solely your work.  All modified
    **     versions of the covered work must be marked in a reasonable way to make it
    **     clear that the modified work is not originating from Golden Code Development
    **     Corporation or FWD.  All modified versions must contain the notices of
    **     attribution required in this license.
    */

    package com.goldencode.p2j.admin.client.application.login;

    import org.gwtbootstrap3.client.ui.Button;
    import org.gwtbootstrap3.client.ui.TextBox;

    import com.goldencode.p2j.security.*;
    import com.google.gwt.dom.client.Document;
    import com.google.gwt.event.dom.client.ClickEvent;
    import com.google.gwt.event.dom.client.KeyCodes;
    import com.google.gwt.event.dom.client.KeyPressEvent;
    import com.google.gwt.uibinder.client.UiBinder;
    import com.google.gwt.uibinder.client.UiField;
    import com.google.gwt.uibinder.client.UiHandler;
    import com.gwtplatform.mvp.client.ViewWithUiHandlers;
    import com.google.gwt.user.client.Window;
    import com.google.gwt.user.client.ui.Widget;
    import com.google.inject.Inject;

    /**
     * Login view.
     */
    public class LoginView
    extends ViewWithUiHandlers<LoginUiHandlers>
    implements LoginPresenter.MyView
    {
       /**
        * GWT binder.
        */
       interface Binder
       extends UiBinder<Widget, LoginView>
       {}

       /** Widget */
       @UiField
       TextBox userid;

       /** Widget */
       @UiField(provided = true)
       TextBox pwd = new TextBox(Document.get().createPasswordInputElement());

       /** Widget */
       @UiField
       Button submit;

       /**
        * Ctor.
        *
        * @param   binder
        *          GWT binder.
        */
       @Inject
       public LoginView(Binder binder)
       {
          initWidget(binder.createAndBindUi(this));
       }

       /**
        * Displays login error to the user.
        *
        * @param   code
        *          The error code.
        */
       @Override
       public void reportLoginError(int code)
       {
          StringBuilder sb = new StringBuilder();
          sb.append("Login failed.");

          switch (code)
          {
             case SecurityConstants.AUTH_RESULT_INVALID_USERID:
             case SecurityConstants.AUTH_RESULT_INVALID_PASSWORD:
                sb.append(" Invalid user name or password.");
                break;
             case SecurityConstants.AUTH_RESULT_INSUFFICIENT_RIGHTS:
                sb.append(" Insufficient account rights.");
                break;
          }

          Window.alert(sb.toString());
       }

       /**
        * Report unspecified login failure to the user.
        */
       @Override
       public void reportFailure()
       {
          Window.alert("Unspecified login failure, please try again later!");
       }

       /**
        * Clears the password input box.
        */
       @Override
       public void clearPassword()
       {
          pwd.setValue("");
       }

       /**
        * Click event handler.
        *
        * @param   e
        *          Click event.
        */
       @UiHandler("submit")
       public void onClick(ClickEvent e)
       {
          login();
       }

       /**
        * Key press event handler.
        *
        * @param   event
        *          Key press event.
        */
       @UiHandler("userid")
       public void useridKeyPress(KeyPressEvent event)
       {
          if(event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ENTER)
          {
             pwd.setFocus(true);
          }
       }

       /**
        * Key press event handler.
        *
        * @param   event
        *          Key press event.
        */
       @UiHandler("pwd")
       public void pwdKeyPress(KeyPressEvent event)
       {
          if(event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ENTER)
          {
             login();
          }
       }

       /**
        * Method called after the view is attached to the DOM.
        * <p>
        * You should override this method to perform any ui related initialization that needs to be
        * done after that the
        * view is attached <b>and that the presenter doesn't have to be aware of</b> (attach event
        * handlers for instance)
        */
       @Override
       protected void onAttach()
       {
          super.onAttach();
          userid.setFocus(true);
       }

       /**
        * Proceeds with login.
        */
       private void login()
       {
          getUiHandlers().onSubmitLoginInfo(userid.getValue(), pwd.getValue());
       }
    }