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local Calculator = {}
Calculator.__index = Calculator
Calculator.OPERATIONS = {
ADD = 0,
SUB = 1,
DIV = 2,
MUL = 3,
EQUAL = 4,
CLEAR = 5,
}
function Calculator:new( pos )
local object = setmetatable( {}, Calculator )
object.window = Gui:WindowBox(
Rect:new( pos.x, pos.y, 188, 216 ),
"Calculator",
{ -- Callbacks.
close = function() object:setVisible( false ) end,
grab = function() object:setToTop() end,
drag = function( this ) object:setPosition( Vec2:new( this.bounds.x, this.bounds.y ) ) end
}
)
object.display = Gui:Label(
Rect:new( 0, 0, 180, 20 ),
""
)
object.display.position = Vec2:new( 10, 32 )
object.buttons = {}
local buttons = {
{ "7", { pressed = function() object:addNumber( 7 ) end } },
{ "8", { pressed = function() object:addNumber( 8 ) end } },
{ "9", { pressed = function() object:addNumber( 9 ) end } },
{ "/", { pressed = function() object:addOperation( self.OPERATIONS.DIV ) end } },
{ "4", { pressed = function() object:addNumber( 4 ) end } },
{ "5", { pressed = function() object:addNumber( 5 ) end } },
{ "6", { pressed = function() object:addNumber( 6 ) end } },
{ "*", { pressed = function() object:addOperation( self.OPERATIONS.MUL ) end } },
{ "1", { pressed = function() object:addNumber( 1 ) end } },
{ "2", { pressed = function() object:addNumber( 2 ) end } },
{ "3", { pressed = function() object:addNumber( 3 ) end } },
{ "-", { pressed = function() object:addOperation( self.OPERATIONS.SUB ) end } },
{ "0", { pressed = function() object:addNumber( 0 ) end } },
{ "C", { pressed = function() object:addOperation( self.OPERATIONS.CLEAR ) end } },
{ "=", { pressed = function() object:addOperation( self.OPERATIONS.EQUAL ) end } },
{ "+", { pressed = function() object:addOperation( self.OPERATIONS.ADD ) end } },
}
local rowCount = 4
local buttonRect = Rect:new( 5, 64, 40, 32 )
local startPos = Vec2:new( buttonRect.x, buttonRect.y )
local buttonSpacing = 6
for i, button in ipairs( buttons ) do
table.insert( object.buttons, Gui:Button(
buttonRect:clone(),
button[1],
button[2]
) )
-- Set position in window.
object.buttons[i].position = Vec2:new( buttonRect.x, buttonRect.y )
if i % rowCount == 0 then
buttonRect.x = startPos.x
buttonRect.y = buttonRect.y + buttonRect.height + buttonSpacing
else
buttonRect.x = buttonRect.x + buttonRect.width + buttonSpacing
end
end
object.visible = true
object.numbers = { "", "" }
object.op = nil
object:setPosition( pos )
return object
end
function Calculator:addNumber( num )
if self.op == nil then
self.numbers[1] = self.numbers[1]..tostring( num )
else
self.numbers[2] = self.numbers[2]..tostring( num )
end
self:updateDisplay()
end
function Calculator:addOperation( op )
if op == self.OPERATIONS.EQUAL then
if self.op == self.OPERATIONS.ADD then
self.numbers[1] = tonumber( self.numbers[1] ) + tonumber( self.numbers[2] )
elseif self.op == self.OPERATIONS.SUB then
self.numbers[1] = tonumber( self.numbers[1] ) - tonumber( self.numbers[2] )
elseif self.op == self.OPERATIONS.MUL then
self.numbers[1] = tonumber( self.numbers[1] ) * tonumber( self.numbers[2] )
elseif self.op == self.OPERATIONS.DIV then
self.numbers[1] = tonumber( self.numbers[1] ) / tonumber( self.numbers[2] )
end
self.numbers[2] = ""
self.op = nil
elseif op == self.OPERATIONS.CLEAR then
self.numbers[1] = ""
self.numbers[2] = ""
self.op = nil
else
self.op = op
end
self:updateDisplay()
end
function Calculator:updateDisplay()
self.display.text = self.numbers[1]
if self.op == self.OPERATIONS.ADD then
self.display.text = self.display.text.."+"
elseif self.op == self.OPERATIONS.SUB then
self.display.text = self.display.text.."-"
elseif self.op == self.OPERATIONS.MUL then
self.display.text = self.display.text.."*"
elseif self.op == self.OPERATIONS.DIV then
self.display.text = self.display.text.."/"
end
self.display.text = self.display.text..self.numbers[2]
end
function Calculator:setPosition( pos )
self.display:setPosition( pos + self.display.position )
for _, button in ipairs( self.buttons ) do
button:setPosition( pos + button.position )
end
end
function Calculator:setToTop()
Gui:setToTop( self.window )
Gui:setToTop( self.display )
for _, button in ipairs( self.buttons ) do
Gui:setToTop( button )
end
end
function Calculator:setVisible( visible )
self.visible = visible
self.window.visible = visible
self.display.visible = visible
for _, button in ipairs( self.buttons ) do
button.visible = visible
end
end
return Calculator
|
