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** This file is part of the examples of the Qt Toolkit.
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local QtCore = require 'qtcore'
local QtGui = require 'qtgui'

local Class = QtCore.Class('MyModel', QtCore.QAbstractTableModel) {}

function Class:parent()
	return QtCore.QModelIndex()
end

function Class:rowCount(parent)
	return 2
end

function Class:columnCount(parent)
	return 3
end

function Class:data(index, role)
	local row = index:row()
	local col = index:column()

    -- generate a log message when this method gets called
    print(string.format('row %d, col%d, role %d', row, col, role))

	local function data()
	    if role == QtCore.DisplayRole then
	    	if row == 0 and col == 1 then
	    		return '<--left'
	    	elseif row == 1 and col == 1 then
	    		return 'right-->'
	    	end
		    return string.format('Row%d, Column%d', index:row() + 1, index:column() + 1)
	    elseif role == QtCore.FontRole then
	    	-- change font only for cell(0,0)
	    	if row == 0 and col == 0 then
	    		local boldFont = QtGui.QFont()
	    		boldFont:setBold(true)
	    		return boldFont
	    	end
	    elseif role == QtCore.BackgroundRole then
	    	-- change background only for cell(1,2)
	    	if row == 1 and col == 2 then
	    		local redBackground = QtGui.QBrush('red', 'SolidPattern')
	    		return redBackground
	    	end
	    elseif role == QtCore.TextAlignmentRole then
	    	-- change text alignment only for cell(1,1)
	    	if row == 1 and col == 1 then
	    		return QtCore.AlignRight
	    	end
	    elseif role == QtCore.CheckStateRole then
	    	-- add a checkbox to cell(1,0)
	    	if row == 1 and col == 0 then
	    		return QtCore.Checked
	    	end
	    end
	end

    local val = QtCore.QVariant()
    val:setValue(data())
    return val
end

return Class
