// Keyboard shortcuts support
function C1KeyboardShortcutsClass()
{
    this.shortcuts = [];
    document.onkeydown = this.keydown;
}
C1KeyboardShortcutsClass.prototype.keydown = function(event)
{
    if (typeof(event) == 'undefined')
        event = window.event;
    if (window.C1KeyboardShortcuts.processKeyEvent(event.keyCode, event.ctrlKey, event.altKey, event.shiftKey))
            c1c_stopEvent(event);
}
C1KeyboardShortcutsClass.prototype.addShortcut = function(linkItem, shortcutText)
{
    var shortcutObj = this.parse(shortcutText);
    if (shortcutObj)
        this.add(linkItem, shortcutObj);
}
C1KeyboardShortcutsClass.prototype.add = function(linkItem, shortcutObj)
{
    this.shortcuts[this.shortcuts.length] = {item:linkItem, shortcut:shortcutObj};
}
C1KeyboardShortcutsClass.prototype.processKeyEvent = function(keyCode, ctrlKey, altKey, shiftKey)
{
    for(var i=0;i<this.shortcuts.length;i++)
    {
        if (this.equal(this.shortcuts[i].shortcut, keyCode, ctrlKey, altKey, shiftKey))
        {
            if (this.checkItemExists(this.shortcuts[i].item))
            {
                c1c_item_onclick(this.shortcuts[i].item, null, true);
                return true;
            }
        }
    }
    return false;
}
C1KeyboardShortcutsClass.prototype.checkItemExists = function(item)
{
    return document.getElementById(item.id) == item.Item;
}
C1KeyboardShortcutsClass.prototype.parse = function(shortcutText)
{
    var res = {keyCode:0, keyCodeAlt:0, ctrlKey:false, altKey:false, shiftKey: false};
    var parts = shortcutText.split('+');
    for(var i=0;i<parts.length;i++)
    {
        var literal = parts[i].toLowerCase();
        if (literal == 'ctrl')
        {
            res.ctrlKey = true;
        }
        else if (literal == 'alt')
        {
            res.altKey = true;
        }
        else if (literal == 'shift')
        {
            res.shiftKey = true;
        }
        else 
        {
            if (literal.length == 1 && ((literal >= 'a' && literal <= 'z') || (literal >= '0' && literal <= '9')))
            {
                res.keyCode = literal.charCodeAt(0);
                res.keyCodeAlt = literal.toUpperCase().charCodeAt(0);
            }
            else if ((literal.length == 2 || literal.length == 3) && literal.charAt(0) == 'f')
            {
                var num = literal.substring(1);
                num = parseInt(num);
                if (!isNaN(num) && num >= 1 && num <= 12)
                    res.keyCode = 111+num;
            }
            else if (literal.length == 4 && literal.indexOf('num') == 0)
            {
                var num = literal.charCodeAt(3) + 48;
                if (!num >= 96 && num <= 105)
                    res.keyCode = num;
            }
            else if (literal == 'enter')
                    res.keyCode = 13;
            else if (literal == 'backspace')
                    res.keyCode = 8;
            else if (literal == 'ins')
                    res.keyCode = 45;
            else if (literal == 'del')
                    res.keyCode = 46;
            else if (literal == 'home')
                    res.keyCode = 36;
            else if (literal == 'end')
                    res.keyCode = 35;
            else if (literal == 'pgup')
                    res.keyCode = 33;
            else if (literal == 'pgdn')
                    res.keyCode = 34;
            else if (literal == 'space')
                    res.keyCode = 32;
        }
    }
    if (res.keyCode)
        return res;
    return null;
}
C1KeyboardShortcutsClass.prototype.equal = function(src, keyCode, ctrlKey, altKey, shiftKey)
{
    return (keyCode != 0 && (src.keyCode == keyCode || src.keyCodeAlt == keyCode) && src.ctrlKey == ctrlKey && src.altKey == altKey && src.shiftKey == shiftKey); 
}
window.C1KeyboardShortcuts = new C1KeyboardShortcutsClass();