Improve nixos-gui:

- Can navigate in the tree of option.
- Provide information on options.

svn path=/nixos/trunk/; revision=26945
This commit is contained in:
Nicolas Pierron 2011-04-24 04:19:15 +00:00
parent ba2d96cf85
commit 0265bff844
11 changed files with 587 additions and 321 deletions

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@ -32,4 +32,4 @@ MinVersion=1.9a5
; This field is optional. It specifies the maximum Gecko version that this
; application requires. It should be specified if your application uses
; unfrozen interfaces.
;MaxVersion=1.9.0.*
MaxVersion=2.*

1
gui/chrome.manifest Normal file
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@ -0,0 +1 @@
manifest chrome/chrome.manifest

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@ -1 +1 @@
content nixos-gui content/nixos-gui/
content nixos-gui content/

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@ -1,3 +1,66 @@
function inspect(obj, maxLevels, level)
{
var str = '', type, msg;
// Start Input Validations
// Don't touch, we start iterating at level zero
if(level == null) level = 0;
// At least you want to show the first level
if(maxLevels == null) maxLevels = 1;
if(maxLevels < 1)
return '<font color="red">Error: Levels number must be > 0</font>';
// We start with a non null object
if(obj == null)
return '<font color="red">Error: Object <b>NULL</b></font>';
// End Input Validations
// Each Iteration must be indented
str += '<ul>';
// Start iterations for all objects in obj
for(property in obj)
{
try
{
// Show "property" and "type property"
type = typeof(obj[property]);
str += '<li>(' + type + ') ' + property +
( (obj[property]==null)?(': <b>null</b>'):('')) + '</li>';
// We keep iterating if this property is an Object, non null
// and we are inside the required number of levels
if((type == 'object') && (obj[property] != null) && (level+1 < maxLevels))
str += inspect(obj[property], maxLevels, level+1);
}
catch(err)
{
// Is there some properties in obj we can't access? Print it red.
if(typeof(err) == 'string') msg = err;
else if(err.message) msg = err.message;
else if(err.description) msg = err.description;
else msg = 'Unknown';
str += '<li><font color="red">(Error) ' + property + ': ' + msg +'</font></li>';
}
}
// Close indent
str += '</ul>';
return str;
}
// Run xulrunner application.ini -jsconsole -console, to see messages.
function log(str)
{
Components.classes['@mozilla.org/consoleservice;1']
.getService(Components.interfaces.nsIConsoleService)
.logStringMessage(str);
}
function makeTempFile(prefix)
{
var file = Components.classes["@mozilla.org/file/directory_service;1"]
@ -29,7 +92,7 @@ function readFromFile(file)
var sstream = Components.classes["@mozilla.org/scriptableinputstream;1"]
.createInstance(Components.interfaces.nsIScriptableInputStream);
fstream.init(file, -1, 0, 0);
sstream.init(fstream);
sstream.init(fstream);
var str = sstream.read(4096);
while (str.length > 0) {

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@ -0,0 +1,40 @@
// global variables.
var gNixOS;
var gOptionView;
/*
var gProgressBar;
function setProgress(current, max)
{
if (gProgressBar) {
gProgressBar.value = 100 * current / max;
log("progress: " + gProgressBar.value + "%");
}
else
log("unknow progress bar");
}
*/
function updatePanel(options)
{
log("updatePanel: " + options.length);
var t = "";
for (var i = 0; i < options.length; i++)
{
log("Called with " + options[i].path);
t += options[i].description;
}
$("#option-desc").text(t);
}
function onload()
{
var optionTree = document.getElementById("option-tree");
// gProgressBar = document.getElementById("progress-bar");
// setProgress(0, 1);
gNixOS = new NixOS();
gOptionView = new OptionView(gNixOS.option, updatePanel);
optionTree.view = gOptionView;
}

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@ -0,0 +1,42 @@
<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<!DOCTYPE window>
<!-- To edit this file I recommend you to use:
http://xulfr.org/outils/xulediteur.xul
-->
<window
id = "nixos-gui"
title = "NixOS gui"
width = "800"
height = "600"
xmlns = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<script src="jquery-1.3.2.js"/>
<script src="io.js"/>
<script src="nixos.js"/>
<script src="optionView.js"/>
<script src="main.js"/>
<columns height="580">
<column width = "300">
<tree flex="1" id="option-tree" persist="height" onselect="gOptionView.selectionChanged()">
<treecols>
<treecol persist="hidden width" flex="1" id="opt-name"
label="Option" primary="true"/>
<!-- Uncomment the following column to see the number of option
printed below each options. -->
<!--
<treecol persist="hidden width" flex="1" id="dbg-size"
label="Size"/>
-->
</treecols>
<treechildren id="first-child" flex="1"/>
</tree>
</column>
<column flex="1">
<description id="option-desc" hidden="false"></description>
</column>
</columns>
<!-- <progressmeter id="progress-bar" value="0%"/> -->
</window>

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@ -1,171 +0,0 @@
var COPYCOL = 2;
var gOptionListView = new treeView(["opt-success","opt-name","opt-desc"],
COPYCOL);
// Run xulrunner application.ini -jsconsole -console, to see messages.
function log(str)
{
Components.classes['@mozilla.org/consoleservice;1']
.getService(Components.interfaces.nsIConsoleService)
.logStringMessage(str);
}
// return the DOM of the value returned by nix-instantiate
function dumpOptions(path)
{
var nixInstantiate = "nix-instantiate"; // "@nix@/bin/nix-instantiate";
var nixos = "/etc/nixos/nixos/default.nix"; // "@nixos@/default.nix";
var o = makeTempFile("nixos-options");
path = "eval.options" + (path? "." + path : "");
log("retrieve options from: " + path);
runProgram(nixInstantiate+" "+nixos+" -A "+path+" --eval-only --strict --xml 2>/dev/null | tr -d '' >" + o.path);
var xml = readFromFile(o);
o.remove(false);
// jQuery does a stack overflow when converting the XML to a DOM.
var dom = DOMParser().parseFromString(xml, "text/xml");
log("return dom");
return dom;
}
// Pretty print Nix values.
function nixPP(value, level)
{
function indent(level) { ret = ""; while (level--) ret+= " "; return ret; }
if (!level) level = 0;
var ret = "<no match>";
if (value.is("attrs")) {
var content = "";
value.children().each(function (){
var name = $(this).attr("name");
var value = nixPP($(this).children(), level + 1);
content += indent(level + 1) + name + " = " + value + ";\n";
});
ret = "{\n" + content + indent(level) + "}";
}
else if (value.is("list")) {
var content = "";
value.children().each(function (){
content += indent(level + 1) + "(" + nixPP($(this), level + 1) + ")\n";
});
ret = "[\n" + content + indent(level) + "]";
}
else if (value.is("bool"))
ret = (value.attr("value") == "true");
else if (value.is("string"))
ret = '"' + value.attr("value") + '"';
else if (value.is("path"))
ret = value.attr("value");
else if (value.is("int"))
ret = parseInt(value.attr("value"));
else if (value.is("derivation"))
ret = value.attr("outPath");
else if (value.is("function"))
ret = "<function>";
else {
var content = "";
value.children().each(function (){
content += indent(level + 1) + "(" + nixPP($(this), level + 1) + ")\n";
});
ret = "<!--" + value.selector + "--><!--\n" + content + indent(level) + "-->";
}
return ret;
}
// Function used to reproduce the select operator on the XML DOM.
// It return the value contained in the targeted attribute.
function nixSelect(attrs, selector)
{
var names = selector.split(".");
var value = $(attrs);
for (var i = 0; i < names.length; i++) {
log(nixPP(value) + "." + names[i]);
if (value.is("attrs"))
value = value.children("attr[name='" + names[i] + "']").children();
else {
log("Cannot do an attribute selection.");
break
}
}
log("nixSelect return: " + nixPP(value));
var ret;
if (value.is("attrs") || value.is("list"))
ret = value;
else if (value.is("bool"))
ret = value.attr("value") == "true";
else if (value.is("string"))
ret = value.attr("value");
else if (value.is("int"))
ret = parseInt(value.attr("value"));
else if (value.is("derivation"))
ret = value.attr("outPath");
else if (value.is("function"))
ret = "<function>";
return ret;
}
var gProgressBar;
function setProgress(current, max)
{
if (gProgressBar) {
gProgressBar.value = 100 * current / max;
log("progress: " + gProgressBar.value + "%");
}
else
log("unknow progress bar");
}
// fill the list of options
function setOptionList(optionDOM)
{
var options = $("attrs", optionDOM).filter(function () {
return $(this)
.children("attr[name='_type']")
.children("string[value='option']")
.length != 0;
});
var max = options.length;
log("Number of options: " + max);
setProgress(0, max);
gOptionListView.clear();
options.each(function (index){
var success = nixSelect(this, "config.success");
var name = nixSelect(this, "name");
var desc = nixSelect(this, "description");
if (success && name && desc) {
log("Add option '" + name + "' in the list.");
gOptionListView.addRow([success, name, desc]);
}
else
log("A problem occur while scanning an option.");
setProgress(index + 1, max);
});
}
function onload()
{
var optionList = document.getElementById("option-list");
gProgressBar = document.getElementById("progress-bar");
setProgress(0, 1);
optionList.view = gOptionListView;
// try to avoid blocking the rendering, unfortunately this is not perfect.
setTimeout(function (){
setOptionList(dumpOptions("hardware"));}
, 100);
}

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@ -1,30 +0,0 @@
<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<!DOCTYPE window>
<!-- To edit this file I recommend you to use:
http://xulfr.org/outils/xulediteur.xul
-->
<window
id = "nixos-gui"
title = "NixOS gui"
xmlns = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<script src="jquery-1.3.2.js"/>
<script src="treeView.js"/>
<script src="main.js"/>
<script src="io.js"/>
<tree flex="1" id="option-list" persist="height">
<treecols>
<treecol persist="hidden width" flex="1" id="opt-success" label="Success"/>
<splitter class="tree-splitter"/>
<treecol persist="hidden width" flex="30" id="opt-name" label="Option"/>
<splitter class="tree-splitter"/>
<treecol persist="hidden width" flex="50" id="opt-desc" label="Description"
primary="true"/>
</treecols>
<treechildren id="first-child" flex="1"/>
</tree>
<progressmeter id="progress-bar" value="0%"/>
</window>

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@ -1,117 +0,0 @@
// Taken from pageInfo.js
//******** define a js object to implement nsITreeView
function treeView(columnids, copycol)
{
// columnids is an array of strings indicating the names of the columns, in order
this.columnids = columnids;
this.colcount = columnids.length;
// copycol is the index number for the column that we want to add to
// the copy-n-paste buffer when the user hits accel-c
this.copycol = copycol;
this.rows = 0;
this.tree = null;
this.data = [ ];
this.selection = null;
this.sortcol = null;
this.sortdir = 0;
}
treeView.prototype = {
set rowCount(c) { throw "rowCount is a readonly property"; },
get rowCount() { return this.rows; },
setTree: function(tree)
{
this.tree = tree;
},
getCellText: function(row, column)
{
// row can be null, but js arrays are 0-indexed.
// colidx cannot be null, but can be larger than the number
// of columns in the array (when column is a string not in
// this.columnids.) In this case it's the fault of
// whoever typoed while calling this function.
return this.data[row][column.index] || "";
},
setCellValue: function(row, column, value)
{
},
setCellText: function(row, column, value)
{
this.data[row][column.index] = value;
},
addRow: function(row)
{
this.rows = this.data.push(row);
this.rowCountChanged(this.rows - 1, 1);
},
addRows: function(rows)
{
var length = rows.length;
for(var i = 0; i < length; i++)
this.rows = this.data.push(rows[i]);
this.rowCountChanged(this.rows - length, length);
},
rowCountChanged: function(index, count)
{
this.tree.rowCountChanged(index, count);
},
invalidate: function()
{
this.tree.invalidate();
},
clear: function()
{
if (this.tree)
this.tree.rowCountChanged(0, -this.rows);
this.rows = 0;
this.data = [ ];
},
handleCopy: function(row)
{
return (row < 0 || this.copycol < 0) ? "" : (this.data[row][this.copycol] || "");
},
performActionOnRow: function(action, row)
{
if (action == "copy") {
var data = this.handleCopy(row)
this.tree.treeBody.parentNode.setAttribute("copybuffer", data);
}
},
getRowProperties: function(row, prop) { },
getCellProperties: function(row, column, prop) { },
getColumnProperties: function(column, prop) { },
isContainer: function(index) { return false; },
isContainerOpen: function(index) { return false; },
isSeparator: function(index) { return false; },
isSorted: function() { },
canDrop: function(index, orientation) { return false; },
drop: function(row, orientation) { return false; },
getParentIndex: function(index) { return 0; },
hasNextSibling: function(index, after) { return false; },
getLevel: function(index) { return 0; },
getImageSrc: function(row, column) { },
getProgressMode: function(row, column) { },
getCellValue: function(row, column) { },
toggleOpenState: function(index) { },
cycleHeader: function(col) { },
selectionChanged: function() { },
cycleCell: function(row, column) { },
isEditable: function(row, column) { return false; },
isSelectable: function(row, column) { return false; },
performAction: function(action) { },
performActionOnCell: function(action, row, column) { }
};

205
gui/chrome/content/nixos.js Normal file
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@ -0,0 +1,205 @@
function NixOS () {
var env = Components.classes["@mozilla.org/process/environment;1"].
getService(Components.interfaces.nsIEnvironment);
if (env.exists("NIXOS"))
this.nixos = env.get("NIXOS");
if (env.exists("NIXOS_CONFIG"))
this.config = env.get("NIXOS_CONFIG");
if (env.exists("NIXPKGS"))
this.nixpkgs = env.get("NIXPKGS");
if (env.exists("mountPoint"))
this.root = env.get("mountPoint");
if (env.exists("NIXOS_OPTION"))
this.optionBin = env.get("NIXOS_OPTION");
this.option = new Option("options", this, null);
};
NixOS.prototype = {
root: "",
nixos: "/etc/nixos/nixos",
nixpkgs: "/etc/nixos/nixpkgs",
config: "/etc/nixos/configuration.nix",
instantiateBin: "/var/run/current-system/sw/bin/nix-instantiate",
optionBin: "/var/run/current-system/sw/bin/nixos-option",
tmpFile: "nixos-gui",
option: null
};
function Option (name, context, parent) {
this.name = name;
this.context_ = context;
if (parent == null)
this.path = "";
else if (parent.path == "")
this.path = name;
else
this.path = parent.path + "." + name;
};
Option.prototype = {
load: function () {
var env = "";
env += "'NIXOS=" + this.context_.root + this.context_.nixos + "' ";
env += "'NIXOS_PKGS=" + this.context_.root + this.context_.nixpkgs + "' ";
env += "'NIXOS_CONFIG=" + this.context_.config + "' ";
var out = makeTempFile(this.context_.tmpFile);
var prog = this.context_.instantiateBin + " 2>&1 >" + out.path + " ";
var args = "";
args += " -A eval.options" + (this.path != "" ? "." : "") + this.path;
args += " --eval-only --xml --no-location";
args += " '" + this.context_.root + this.context_.nixos + "'";
runProgram(/*env +*/ prog + args);
var xml = readFromFile(out);
out.remove(false);
// jQuery does a stack overflow when converting a huge XML to a DOM.
var dom = DOMParser().parseFromString(xml, "text/xml");
var xmlAttrs = $("attr", dom);
this.isOption = xmlAttrs
.filter (
function (idx) {
return $(this).attr("name") == "_type";
// !!! We could not rely on the value of the attribute because it
// !!! may be unevaluated.
// $(this).children("string[value='option']").length != 0;
})
.length != 0;
if (!this.isOption)
{
var cur = this;
var attrs = new Array();
xmlAttrs.each(
function (index) {
var name = $(this).attr("name");
var attr = new Option(name, cur.context_, cur);
attrs.push(attr);
}
);
this.subOptions = attrs;
}
else
{
this.loadDesc();
// TODO: handle sub-options here.
}
this.isLoaded = true;
},
loadDesc: function () {
var env = "";
env += "'NIXOS=" + this.context_.root + this.context_.nixos + "' ";
env += "'NIXOS_PKGS=" + this.context_.root + this.context_.nixpkgs + "' ";
env += "'NIXOS_CONFIG=" + this.context_.config + "' ";
var out = makeTempFile(this.context_.tmpFile);
var prog = this.context_.optionBin + " 2>&1 >" + out.path + " ";
var args = " -vdl " + this.path;
runProgram(/*env + */ prog + args);
this.description = readFromFile(out);
out.remove(false);
},
// keep the context under which this option has been used.
context_: null,
// name of the option.
name: "",
// result of nixos-option.
description: "",
// path to reach this option
path: "",
// list of options accessible from here.
isLoaded: false,
isOption: false,
subOptions: []
};
/*
// Pretty print Nix values.
function nixPP(value, level)
{
function indent(level) { ret = ""; while (level--) ret+= " "; return ret; }
if (!level) level = 0;
var ret = "<no match>";
if (value.is("attrs")) {
var content = "";
value.children().each(function (){
var name = $(this).attr("name");
var value = nixPP($(this).children(), level + 1);
content += indent(level + 1) + name + " = " + value + ";\n";
});
ret = "{\n" + content + indent(level) + "}";
}
else if (value.is("list")) {
var content = "";
value.children().each(function (){
content += indent(level + 1) + "(" + nixPP($(this), level + 1) + ")\n";
});
ret = "[\n" + content + indent(level) + "]";
}
else if (value.is("bool"))
ret = (value.attr("value") == "true");
else if (value.is("string"))
ret = '"' + value.attr("value") + '"';
else if (value.is("path"))
ret = value.attr("value");
else if (value.is("int"))
ret = parseInt(value.attr("value"));
else if (value.is("derivation"))
ret = value.attr("outPath");
else if (value.is("function"))
ret = "<function>";
else {
var content = "";
value.children().each(function (){
content += indent(level + 1) + "(" + nixPP($(this), level + 1) + ")\n";
});
ret = "<!--" + value.selector + "--><!--\n" + content + indent(level) + "-->";
}
return ret;
}
// Function used to reproduce the select operator on the XML DOM.
// It return the value contained in the targeted attribute.
function nixSelect(attrs, selector)
{
var names = selector.split(".");
var value = $(attrs);
for (var i = 0; i < names.length; i++) {
log(nixPP(value) + "." + names[i]);
if (value.is("attrs"))
value = value.children("attr[name='" + names[i] + "']").children();
else {
log("Cannot do an attribute selection.");
break;
}
}
log("nixSelect return: " + nixPP(value));
var ret;
if (value.is("attrs") || value.is("list"))
ret = value;
else if (value.is("bool"))
ret = value.attr("value") == "true";
else if (value.is("string"))
ret = value.attr("value");
else if (value.is("int"))
ret = parseInt(value.attr("value"));
else if (value.is("derivation"))
ret = value.attr("outPath");
else if (value.is("function"))
ret = "<function>";
return ret;
}
*/

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@ -0,0 +1,233 @@
// extend NixOS options to handle the Tree View. Should be better to keep a
// separation of concern here.
Option.prototype.tv_opened = false;
Option.prototype.tv_size = 1;
Option.prototype.tv_open = function () {
this.tv_opened = true;
this.tv_size = 1;
// load an option if it is not loaded yet, and initialize them to be
// read by the Option view.
if (!this.isLoaded)
this.load();
// If this is not an option, then add it's lits of sub-options size.
if (!this.isOption)
{
for (var i = 0; i < this.subOptions.length; i++)
this.tv_size += this.subOptions[i].tv_size;
}
};
Option.prototype.tv_close = function () {
this.tv_opened = false;
this.tv_size = 1;
};
function OptionView (root, selCallback) {
root.tv_open();
this.rootOption = root;
this.selCallback = selCallback;
}
OptionView.prototype = {
rootOption: null,
selCallback: null,
// This function returns the path to option which is at the specified row.
reach_cache: null,
reachRow: function (row) {
var o = this.rootOption; // Current option.
var r = 0; // Number of rows traversed.
var c = 0; // Child index.
var path = [{ row: r, opt: o }]; // new Array();
// hypothesis: this.rootOption.tv_size is always open and bigger than
// Use the previous returned value to avoid making to many checks and to
// optimize for frequent access of near rows.
if (this.reach_cache != null)
{
for (var i = this.reach_cache.length - 2; i >= 0; i--) {
var p = this.reach_cache[i];
// If we will have to go the same path.
if (row >= p.row && row < p.row + p.opt.tv_size)
{
path.unshift(p);
r = path[0].row;
o = path[0].opt;
}
else
break;
};
}
while (r != row)
{
// Go deeper in the child which contains the requested row. The
// tv_size contains the size of the tree starting from each option.
c = 0;
while (c < o.subOptions.length && r + o.subOptions[c].tv_size < row)
{
r += o.subOptions[c].tv_size;
c += 1;
}
if (c < o.subOptions.length && r + o.subOptions[c].tv_size >= row)
{
// Count the current option as a row.
o = o.subOptions[c];
r += 1;
}
else
alert("WTF: " + o.name + " ask: " + row + " children: " + o.subOptions + " c: " + c);
path.unshift({ row: r, opt: o });
}
this.reach_cache = path;
return path;
},
// needs to return true if there is a /row/ at the same level /after/ a
// given row.
hasNextSibling: function(row, after) {
log("sibling " + row + " after " + after);
var path = reachRow(row);
if (path.length > 1)
{
var last = path[1].row + path[1].opt.tv_size;
// Has a next sibling if the row is not over the size of the
// parent and if the current one is not the last child.
return after + 1 < last && path[0].row + path[0].opt.tv_size < last;
}
else
// The top-level option has no sibling.
return false;
},
// Does the current row contain any sub-options?
isContainer: function(row) {
return !this.reachRow(row)[0].opt.isOption;
},
isContainerEmpty: function(row) {
return this.reachRow(row)[0].opt.subOptions.length == 0;
},
isContainerOpen: function(row) {
return this.reachRow(row)[0].opt.tv_opened;
},
// Open or close an option.
toggleOpenState: function (row) {
var path = this.reachRow(row);
var delta = -path[0].opt.tv_size;
if (path[0].opt.tv_opened)
path[0].opt.tv_close();
else
path[0].opt.tv_open();
delta += path[0].opt.tv_size;
// Parents are alreay opened, but we need to update the tv_size
// counters. Thus we have to invalidate the reach cache.
this.reach_cache = null;
for (var i = 1; i < path.length; i++)
path[i].opt.tv_open();
this.tree.rowCountChanged(row + 1, delta);
},
// Return the identation level of the option at the line /row/. The
// top-level level is 0.
getLevel: function(row) {
return this.reachRow(row).length - 1;
},
// Obtain the index of a parent row. If there is no parent row,
// returns -1.
getParentIndex: function(row) {
var path = this.reachRow(row);
if (path.length > 1)
return path[1].row;
else
return -1;
},
// Return the content of each row base on the column name.
getCellText: function(row, column) {
if (column.id == "opt-name")
return this.reachRow(row)[0].opt.name;
if (column.id == "dbg-size")
return this.reachRow(row)[0].opt.tv_size;
return "";
},
// We have no column with images.
getCellValue: function(row, column) { },
isSelectable: function(row, column) { return true; },
// Get the selection out of the tree and give options to the call back
// function.
selectionChanged: function() {
if (this.selCallback == null)
return;
var opts = [];
var start = new Object();
var end = new Object();
var numRanges = this.tree.view.selection.getRangeCount();
for (var t = 0; t < numRanges; t++) {
this.tree.view.selection.getRangeAt(t,start,end);
for (var v = start.value; v <= end.value; v++) {
var opt = this.reachRow(v)[0].opt;
if (!opt.isLoaded)
opt.load();
if (opt.isOption)
opts.push(opt);
}
}
if (opts.lenght != 0)
this.selCallback(opts);
},
set rowCount(c) { throw "rowCount is a readonly property"; },
get rowCount() { return this.rootOption.tv_size; },
// refuse drag-n-drop of options.
canDrop: function (index, orientation, dataTransfer) { return false; },
drop: function (index, orientation, dataTransfer) { },
// ?
getCellProperties: function(row, column, prop) { },
getColumnProperties: function(column, prop) { },
getRowProperties: function(row, prop) { },
getImageSrc: function(row, column) { },
// No progress columns are used.
getProgressMode: function(row, column) { },
// Do not add options yet.
isEditable: function(row, column) { return false; },
setCellValue: function(row, column, value) { },
setCellText: function(row, column, value) { },
// ...
isSeparator: function(index) { return false; },
isSorted: function() { return false; },
performAction: function(action) { },
performActionOnCell: function(action, row, column) { },
performActionOnRow: function(action, row) { }, // ??
// ??
cycleCell: function (row, col) { },
cycleHeader: function(col) { },
selection: null,
tree: null,
setTree: function(tree) { this.tree = tree; }
};