com.google.gwt.gwtpages.demo.client.pages.layout.MenuItemsPanel.java Source code

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Here is the source code for com.google.gwt.gwtpages.demo.client.pages.layout.MenuItemsPanel.java

Source

package com.google.gwt.gwtpages.demo.client.pages.layout;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.event.dom.client.MouseOutEvent;
import com.google.gwt.event.dom.client.MouseOutHandler;
import com.google.gwt.event.dom.client.MouseOverEvent;
import com.google.gwt.event.dom.client.MouseOverHandler;
import com.google.gwt.gwtpages.client.GotoPageCommand;
import com.google.gwt.gwtpages.client.Pages;
import com.google.gwt.gwtpages.client.event.PageShownEvent;
import com.google.gwt.gwtpages.client.event.PageShownEvent.PageShownHandler;
import com.google.gwt.gwtpages.client.page.LoadedPageContainer;
import com.google.gwt.gwtpages.client.page.loader.PageLoader;
import com.google.gwt.gwtpages.client.page.parameters.PageParameters;
import com.google.gwt.gwtpages.demo.client.pages.PageConstants;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Hyperlink;
import com.google.gwt.user.client.ui.SimplePanel;

public class MenuItemsPanel extends FlowPanel implements PageShownHandler {

    private List<MenuItemLink> links;
    private boolean leftSide;
    private boolean initialized = false;

    public MenuItemsPanel(boolean isLeftSide) {
        this.leftSide = isLeftSide;

        links = new ArrayList<MenuItemsPanel.MenuItemLink>();
        links.add(new MenuItemLink(PageLoader.PAGE_DEFAULT, "Home"));
        links.add(new MenuItemLink(PageConstants.PAGE_NAVIGATION, "Navigation"));
        links.add(new MenuItemLink(PageConstants.PAGE_MESSAGES, "Messages"));
        links.add(new MenuItemLink(PageConstants.PAGE_LAYOUTS, "Layouts"));
        links.add(new MenuItemLink(PageConstants.PAGE_LOADERS, "Page Loaders"));
        links.add(new MenuItemLink(PageConstants.PAGE_EVENTS, "Page Events"));
        links.add(new MenuItemLink(PageConstants.PAGE_SECURITY, "Security"));
        links.add(new MenuItemLink(PageConstants.PAGE_MVP, "MVP"));

        for (MenuItemLink link : links)
            add(link);
    }

    @Override
    protected void onAttach() {
        super.onAttach();
        if (!initialized) {
            Pages.get().getEventBus().addHandler(PageShownEvent.TYPE, this);
            initialized = true;
        }
    }

    @Override
    public void onPageShown(LoadedPageContainer currentPageData, PageParameters parameters, GotoPageCommand command,
            LoadedPageContainer previousPageData) {
        boolean matchFound = false;
        for (MenuItemLink link : links) {
            if (link.pageToken.equals(currentPageData.getPageToken())) {
                matchFound = true;
                break;
            }
        }
        if (matchFound) {
            for (MenuItemLink link : links) {
                if (link.pageToken.equals(currentPageData.getPageToken())) {
                    link.select();
                } else {
                    link.reset();
                }
            }
        }
    }

    private class MenuItemLink extends SimplePanel implements MouseOverHandler, MouseOutHandler {
        private String pageToken;
        private Hyperlink link;

        public MenuItemLink(String pageToken, String label) {
            this.pageToken = pageToken;
            link = new Hyperlink(label, pageToken);
            addDomHandler(this, MouseOverEvent.getType());
            addDomHandler(this, MouseOutEvent.getType());
            if (leftSide) {
                addStyleName("menu-item left-side-menu-item");
            } else {
                addStyleName("menu-item right-side-menu-item");
            }
            add(link);
        }

        public void select() {
            if (leftSide) {
                addStyleName("menu-item-selected left-side-menu-item-selected");
            } else {
                addStyleName("menu-item-selected right-side-menu-item-selected");
            }
        }

        public void reset() {
            removeStyleName("menu-item-selected");
            if (leftSide) {
                removeStyleName("left-side-menu-item-selected");
                removeStyleName("left-side-menu-item-hover");
            } else {
                removeStyleName("right-side-menu-item-selected");
                removeStyleName("right-side-menu-item-hover");
            }
        }

        @Override
        public void onMouseOver(MouseOverEvent event) {
            if (leftSide) {
                addStyleName("menu-item-hover left-side-menu-item-hover");
            } else {
                addStyleName("menu-item-hover right-side-menu-item-hover");
            }
        }

        @Override
        public void onMouseOut(MouseOutEvent event) {
            removeStyleName("menu-item-hover");
            if (leftSide) {
                removeStyleName("left-side-menu-item-hover");
            } else {
                addStyleName("right-side-menu-item-hover");
            }
        }
    }
}