source: gs3-extensions/atlas-src/trunk/src/org/greenstone/client/Menu.java@ 22277

package org.greenstone.client;

import java.util.ArrayList;

import com.google.gwt.event.dom.client.MouseOutHandler;
import com.google.gwt.event.dom.client.MouseOverHandler;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;

public class Menu
{
    protected Element _parent = null;
    protected ArrayList<Menu> _childMenus = new ArrayList<Menu>();
    protected ArrayList<MenuItem> _menuItems = new ArrayList<MenuItem>();
    protected HTML _menuDiv = new HTML();
    protected MouseOverHandler _onMouseOver = null;
    protected MouseOutHandler _onMouseOut = null;
    
    public Menu(Element parent, MouseOverHandler onMouseOver, MouseOutHandler onMouseOut)
    {
        _parent = parent;
        parent.appendChild(_menuDiv.getElement());
        _menuDiv.getElement().getStyle().setProperty("background", "#FFFFFF");
        _menuDiv.getElement().getStyle().setProperty("padding", "2px");
        _menuDiv.getElement().getStyle().setProperty("position", "absolute");
        
        _onMouseOver = onMouseOver;
        _onMouseOut = onMouseOut;
    }
    
    public void addMenuItems(ArrayList<MenuItem> menuItems)
    {
        _menuItems = menuItems;
        int maxWidth = -1;
        for(int i = 0; i < menuItems.size(); i++)
        {
            if(!menuItems.get(i).condition())
            {
                continue;
            }
            Element item = menuItems.get(i).getMenuElement();
            item.getStyle().setProperty("background", "#FFFFFF");
            item.getStyle().setProperty("color", "#000000");
            item.getStyle().setProperty("border", "1px solid");
            item.getStyle().setProperty("padding", "2px");
            
            Label newLabel = Label.wrap(item);  
            newLabel.addMouseOverHandler(_onMouseOver);
            newLabel.addMouseOutHandler(_onMouseOut);
            newLabel.addClickHandler(menuItems.get(i).getClickHandler());
            
            _menuDiv.getElement().appendChild(item);
            
            if(item.getOffsetWidth() > maxWidth)
            {
                maxWidth = item.getOffsetWidth();
            }
        }
        
        for(int i = 0; i < menuItems.size(); i++)
        {
            menuItems.get(i).getMenuElement().getStyle().setProperty("width", maxWidth + "px");
        }
    }
    
    public void moveMenu(final int x, final int y)
    {
        _menuDiv.setVisible(false);
        _menuDiv.getElement().getStyle().setProperty("left", x + "px");
        _menuDiv.getElement().getStyle().setProperty("top", y + "px");
        
        Timer pause = new Timer()
        {
            public void run() 
            {               
                if (_menuDiv.getOffsetHeight() > GS3MapLibrary.getElementById("GSContent").getOffsetHeight())
                {
                    _menuDiv.getElement().getStyle().setProperty("top", GS3MapLibrary.getElementById("GSContent").getAbsoluteTop() + "px");
                    _menuDiv.getElement().getStyle().setProperty("overflow", "auto");
                    _menuDiv.getElement().getStyle().setProperty("height", GS3MapLibrary.getElementById("GSContent").getOffsetHeight() + "px");
                }
                else if(y + _menuDiv.getOffsetHeight() > GS3MapLibrary.getElementById("GSFooter").getAbsoluteTop())
                {
                    _menuDiv.getElement().getStyle().setProperty("top", (y - ( y + _menuDiv.getOffsetHeight() - GS3MapLibrary.getElementById("GSFooter").getAbsoluteTop()) + "px"));
                }
                _menuDiv.setVisible(true);
            }
        };
        pause.schedule(100);
    }
    
    public void addChildMenu(Menu menu)
    {
        _childMenus.add(menu);
    }
    
    public void hideMenu()
    {
        _menuDiv.setVisible(false);
        
        for(Menu m : _childMenus)
        {
            if(m != null)
            {
                m.hideMenu();
            }
        }
    }
    
    public void refreshMenu()
    {
        _parent.removeChild(_menuDiv.getElement());
        _menuDiv = new HTML();
        _parent.appendChild(_menuDiv.getElement());
        _menuDiv.getElement().getStyle().setProperty("background", "#FFFFFF");
        _menuDiv.getElement().getStyle().setProperty("padding", "2px");
        _menuDiv.getElement().getStyle().setProperty("position", "absolute");
        addMenuItems(_menuItems);
    }
    
    public void showMenu()
    {
        _menuDiv.setVisible(true);
    }
    
    public HTML getMenuDiv()
    {
        return _menuDiv;
    }
}