var EA_keys = {8:"Retour arriere",9:"Tabulation",12:"Milieu (pave numerique)",13:"Entrer",16:"Shift",17:"Ctrl",18:"Alt",19:"Pause",20:"Verr Maj",27:"Esc",32:"Space",33:"Page up",34:"Page down",35:"End",36:"Begin",37:"Left",38:"Up",39:"Right",40:"Down",44:"Impr ecran",45:"Inser",46:"Suppr",91:"Menu Demarrer Windows / touche pomme Mac",92:"Menu Demarrer Windows",93:"Menu contextuel Windows",112:"F1",113:"F2",114:"F3",115:"F4",116:"F5",117:"F6",118:"F7",119:"F8",120:"F9",121:"F10",122:"F11",123:"F12",144:"Verr Num",145:"Arret defil"};



function keyDown(e){
	if(!e){	// if IE
		e=event;
	}
	
	// send the event to the plugins
	for(var i in editArea.plugins){
		if(typeof(editArea.plugins[i].onkeydown)=="function"){
			if(editArea.plugins[i].onkeydown(e)===false){ // stop propaging
				if(editArea.nav['isIE'])
					e.keyCode=0;
				return false;
			}
		}
	}

	var target_id=(e.target || e.srcElement).id;
	var use=false;
	if (EA_keys[e.keyCode])
		letter=EA_keys[e.keyCode];
	else
		letter=String.fromCharCode(e.keyCode);
	
	var low_letter= letter.toLowerCase();
			
	if(letter=="Page up" && !editArea.nav['isOpera']){
		editArea.execCommand("scroll_page", {"dir": "up", "shift": ShiftPressed(e)});
		use=true;
	}else if(letter=="Page down" && !editArea.nav['isOpera']){
		editArea.execCommand("scroll_page", {"dir": "down", "shift": ShiftPressed(e)});
		use=true;
	}else if(editArea.is_editable==false){
		// do nothing but also do nothing else (allow to navigate with page up and page down)
		return true;
	}else if(letter=="Tabulation" && target_id=="textarea" && !CtrlPressed(e) && !AltPressed(e)){	
		if(ShiftPressed(e))
			editArea.execCommand("invert_tab_selection");
		else
			editArea.execCommand("tab_selection");
		
		use=true;
		if(editArea.nav['isOpera'] || (editArea.nav['isFirefox'] && editArea.nav['isMacOS']) )	// opera && firefox mac can't cancel tabulation events...
			setTimeout("editArea.execCommand('focus');", 1);
	}else if(letter=="Entrer" && target_id=="textarea"){
		if(editArea.press_enter())
			use=true;
	}else if(letter=="Entrer" && target_id=="area_search"){
		editArea.execCommand("area_search");
		use=true;
	}else  if(letter=="Esc"){
		editArea.execCommand("close_all_inline_popup", e);
		use=true;
	}else if(CtrlPressed(e) && !AltPressed(e) && !ShiftPressed(e)){
		switch(low_letter){
			case "f":				
				editArea.execCommand("area_search");
				use=true;
				break;
			case "r":
				editArea.execCommand("area_replace");
				use=true;
				break;
			case "q":
				editArea.execCommand("close_all_inline_popup", e);
				use=true;
				break;
			case "h":
				editArea.execCommand("change_highlight");			
				use=true;
				break;
			case "g":
				setTimeout("editArea.execCommand('go_to_line');", 5);	// the prompt stop the return false otherwise
				use=true;
				break;
			case "e":
				editArea.execCommand("show_help");
				use=true;
				break;
			case "z":
				use=true;
				editArea.execCommand("undo");
				break;
			case "y":
				use=true;
				editArea.execCommand("redo");
				break;
			default:
				break;			
		}		
	}		
	
	// check to disable the redo possibility if the textarea content change
	if(editArea.next.length > 0){
		setTimeout("editArea.check_redo();", 10);
	}
	
	setTimeout("editArea.check_file_changes();", 10);
	
	
	if(use){
		// in case of a control that sould'nt be used by IE but that is used => THROW a javascript error that will stop key action
		if(editArea.nav['isIE'])
			e.keyCode=0;
		return false;
	}
	//alert("Test: "+ letter + " ("+e.keyCode+") ALT: "+ AltPressed(e) + " CTRL "+ CtrlPressed(e) + " SHIFT "+ ShiftPressed(e));
	
	return true;
	
};


// return true if Alt key is pressed
function AltPressed(e) {
	if (window.event) {
		return (window.event.altKey);
	} else {
		if(e.modifiers)
			return (e.altKey || (e.modifiers % 2));
		else
			return e.altKey;
	}
};

// return true if Ctrl key is pressed
function CtrlPressed(e) {
	if (window.event) {
		return (window.event.ctrlKey);
	} else {
		return (e.ctrlKey || (e.modifiers==2) || (e.modifiers==3) || (e.modifiers>5));
	}
};

// return true if Shift key is pressed
function ShiftPressed(e) {
	if (window.event) {
		return (window.event.shiftKey);
	} else {
		return (e.shiftKey || (e.modifiers>3));
	}
};
