bwbv.rlt.client.ui.HeaderPane.java Source code

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Here is the source code for bwbv.rlt.client.ui.HeaderPane.java

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/*
 * Copyright 2002-2008 the original author or authors.
 *
 * 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 bwbv.rlt.client.ui;

import bwbv.rlt.client.ClientController;
import bwbv.rlt.client.ClientState;

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.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.PasswordTextBox;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * A {@link Pane} that shows the header of the main page. This header consists
 * of a title and a logout button/link.
 * 
 * Borrowed from Beginning Google Web Toolkit Book
 */
public class HeaderPane extends Composite implements ClientState.ChangeListener {

    private ClientState clientState;
    private ClientController clientController;
    private PopupPanel confirmPopup;
    private DockPanel main;

    /**
     * Constructs a new HeaderPane that displays the given text.
     * 
     * @param titleText
     *            The text this header should show as a title.
     */
    public HeaderPane(ClientState clientState, ClientController clientController) {
        this.clientState = clientState;
        this.clientController = clientController;
        clientState.addChangeListener(ClientState.ChangeListener.USERCHANGED_EVENT, this);

        main = new DockPanel();
        main.add(new Label("BWBV RLT Online"), DockPanel.CENTER);
        reset();
        initWidget(main);
        setStyleName("HeaderPane");
    }

    public void reset() {
        //TODO: call isLoggedIn() ?
        boolean isLoggedIn = clientState.getUserName() != null;
        HorizontalPanel panel = buildHeaderPanel(isLoggedIn);
        main.remove(0);
        main.add(panel, DockPanel.EAST);
    }

    /**
     * Build this conditionally based on isLoggedIn
     * @param isLoggedIn
     * @return
     */
    private HorizontalPanel buildHeaderPanel(boolean isLoggedIn) {
        HorizontalPanel panel = new HorizontalPanel();
        panel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);
        if (isLoggedIn) {
            panel.setSpacing(10);
            panel.add(new Label("Welcome " + clientState.getUserName()));

            Button logoutButton = new Button("Logout");
            logoutButton.setStyleName("LogoutButton");
            logoutButton.addClickListener(new ClickListener() {
                public void onClick(Widget sender) {
                    logout();
                }
            });
            panel.add(logoutButton);
        } else {
            Button loginButon = new Button("Login");
            loginButon.setStyleName("LoginButton");
            loginButon.addClickListener(new ClickListener() {
                public void onClick(Widget sender) {
                    showNewUserNameRequestPopupPanel();
                }
            });
            panel.add(loginButon);
        }
        return panel;
    }

    private void showNewUserNameRequestPopupPanel() {
        confirmPopup = new PopupPanel(false, true);
        VerticalPanel panel = new VerticalPanel();
        //      panel.add(new Label("What is your login Name?"));
        //      panel.add(textBox);
        Grid grid = new Grid(2, 2);
        grid.setText(0, 0, "Benutzer:");
        final TextBox textBox = new TextBox();
        grid.setWidget(0, 1, textBox);
        grid.setText(1, 0, "Passwort:");
        final PasswordTextBox pwdBox = new PasswordTextBox();
        grid.setWidget(1, 1, pwdBox);
        panel.add(grid);
        Button ok = new Button("OK");
        ok.addClickListener(new ClickListener() {
            public void onClick(Widget w) {
                confirmPopup.hide();
                login(textBox.getText(), pwdBox.getText());
            }
        });

        panel.add(ok);
        confirmPopup.add(panel);
        confirmPopup.center();
        textBox.setFocus(true);
        confirmPopup.show();
    }

    private void logout() {
        clientController.getRltService().logout(clientState);
    }

    private void login(String userName, String pwd) {
        clientController.getRltService().login(clientState, userName, pwd);
    }

    @Override
    public void onChange(String eventName, ClientState clientState) {
        reset();
    }
}