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« on: September 05, 2014, 03:19:46 pm »
To demonstrate the power of having lua on the lua side, I've upgraded the example of the previous post (demonstrating the building of a numeric keypad) to a working calculator.
--!usr/bin/lua
--[[
TEST WINDOW
--]]
-- start of calculator
local key_x = 20
local key_y = 80
local key_w = 60
local key_h = 60
-- holds the calculation
buffer_command = ""
-- holds the current display value
buffer = ""
buffer_clear = true
-- holds the command
command = ""
--[[
first create the node structure
--]]
Window = ufoui.create_window ("lua_test", nil)
-- create result field
display = ufoui.create_button (Window, "test", nil)
display:set_text("_")
display:set_tooltip("calculator display")
display:set_pos(20.0, 20.0)
display:set_size(200.0, 20.0)
display:set_color(1.0, 1.0, 0.0, 1.0)
display:set_selectcolor(1.0, 1.0, 1.0, 1.0)
display:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
display:set_borderthickness(1)
display:set_bordercolor(0.0, 0.5, 0.0, 1.0)
-- create numeric pad
local x=key_x
local y=key_y
for i = 1, 9 do
-- create a button named btn<digit>
local digit = ufoui.create_button (Window, "btn" .. tostring(i), nil)
-- set properties
digit:set_text(tostring(i))
digit:set_pos(x, y)
digit:set_size(key_w, key_h)
digit:set_color(0.0, 1.0, 0.0, 1.0)
digit:set_selectcolor(1.0, 1.0, 1.0, 1.0)
digit:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
digit:set_borderthickness(1)
digit:set_bordercolor(0.0, 0.5, 0.0, 1.0)
digit.on_click = function (sender)
ufo.print(string.format("processing [%d]\n", tostring(i)))
-- clear buffer on request
if (buffer_clear) then
buffer = ""
buffer_clear = false
end
-- add digit to buffer
buffer = buffer .. tostring(i)
display:set_text(buffer)
end
-- move to next position
x = x + (key_w + 2)
if (i == 3) or (i == 6) then
-- start new row
y = y + (key_h + 2)
x = key_x
end
end
-- add 0 button
zero = ufoui.create_button (Window, "btn0", nil)
zero:set_text("0")
zero:set_pos(key_x, y + key_h + 2)
zero:set_size(3 * key_w, key_h)
zero:set_color(0.0, 1.0, 0.0, 1.0)
zero:set_selectcolor(1.0, 1.0, 1.0, 1.0)
zero:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
zero:set_borderthickness(1)
zero:set_bordercolor(0.0, 0.5, 0.0, 1.0)
zero.on_click = function (sender)
ufo.print("processing [0]\n")
-- clear buffer on request
if (buffer_clear) then
buffer = ""
buffer_clear = false
end
-- add zero to buffer
buffer = buffer .. "0"
display:set_text(buffer)
end
-- add + button
plus = ufoui.create_button (Window, "btnAdd", nil)
plus:set_text("+")
plus:set_pos(x + 2, key_y)
plus:set_size (key_w, key_h)
plus:set_color(0.0, 1.0, 0.0, 1.0)
plus:set_selectcolor(1.0, 1.0, 1.0, 1.0)
plus:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
plus:set_borderthickness(1)
plus:set_bordercolor(0.0, 0.5, 0.0, 1.0)
plus.on_click = function (sender)
ufo.print("processing [+]\n")
-- add command to buffer_command
command = "+"
buffer_clear = true
buffer_command = buffer_command .. buffer .. command
ufo.print(string.format("command: %s\n", buffer_command))
end
-- add - button
minus = ufoui.create_button (Window, "btnSub", nil)
minus:set_text("-")
minus:set_pos(x + 2, key_y + (key_h + 2))
minus:set_size (key_w, key_h)
minus:set_color(0.0, 1.0, 0.0, 1.0)
minus:set_selectcolor(1.0, 1.0, 1.0, 1.0)
minus:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
minus:set_borderthickness(1)
minus:set_bordercolor(0.0, 0.5, 0.0, 1.0)
minus.on_click = function (sender)
ufo.print("processing [-]\n")
-- add command to buffer_command
command = "-"
buffer_clear = true
buffer_command = buffer_command .. buffer .. command
ufo.print(string.format("command: %s\n", buffer_command))
end
-- add return button
enter = ufoui.create_button (Window, "btnGo", nil)
enter:set_text("GO!")
enter:set_pos(x + 2, key_y + 2 * (key_h + 2))
enter:set_size (key_w, key_h)
enter:set_color(0.0, 1.0, 0.0, 1.0)
enter:set_selectcolor(1.0, 1.0, 1.0, 1.0)
enter:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
enter:set_borderthickness(1)
enter:set_bordercolor(0.0, 0.5, 0.0, 1.0)
enter.on_click = function (sender)
ufo.print("processing [GO!]\n")
buffer_command = buffer_command .. buffer
-- execute as lua command to perform the math
ufo.print(string.format("execute: %s\n", buffer_command))
local fn = loadstring("return ".. buffer_command)
buffer = tostring(fn())
display:set_text(buffer)
-- reset but keep result in buffer for next operation
buffer_command = ""
buffer_clear = true
end
-- add clear button
clear = ufoui.create_button (Window, "btnClear", nil)
clear:set_text("C")
clear:set_pos(x + 2, key_y + 3 * (key_h + 2))
clear:set_size (key_w, key_h)
clear:set_color(0.0, 1.0, 0.0, 1.0)
clear:set_selectcolor(1.0, 1.0, 1.0, 1.0)
clear:set_disabledcolor(1.0, 0.0, 0.0, 1.0)
clear:set_borderthickness(1)
clear:set_bordercolor(0.0, 0.5, 0.0, 1.0)
clear.on_click = function (sender)
ufo.print("processing [C]\n")
buffer_command = ""
buffer_clear = true
buffer = ""
display:set_text(buffer)
end
-- setup the window node
Window:set_background ("ui/main_bg")
Window.on_click = function (sender, x, y)
ufo.print("window on_click event handler\n")
ufo.print(string.format("sender = %s, position = (%s,%s)\n", tostring(sender.name), tostring(x), tostring(y)))
end
Window.on_rightclick = function (sender, x, y)
ufo.print("window on_rightclick event handler\n")
end
Window.on_middleclick = function (sender, x, y)
ufo.print("window on_middleclick event handler\n")
end
Window.on_keypressed = function (sender, key, unicode)
ufo.print("window on_keypressed event handler\n")
ufo.print(string.format("key = %s\n", tostring(key)))
end
Window.on_windowopened = function (sender)
ufo.print("window is being opened\n")
end
Window.on_windowclosed = function (sender)
ufo.print("window is being closed\n")
end
function load ()
ufo.print("inside test_lua.ufo: calling load\n")
ufo.print(string.format("created a ui node: name = %s\n", Window.name))
return Window
end
-- register callbacks
ufoui.register_onload (load)
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