ButtonAPI

-- This is an API used for drawing buttons on a ComputerCraft monitor --

-- How to use the API --
--  ButtonAPI.initMonitor(side)
--  ButtonAPI.addButton("button1", 1, 1, 11, 10, "test")
--  ButtonAPI.addButton("button2", 11, 11, 5, 5, "test02")
--  ButtonAPI.draw()
--  ButtonAPI.initEventHandler(eventHandler)
--  function eventHandler()
--      while true do
--          local event, name, x, y = os.pullEvent("button")
--          print("Event: " .. event .. " Name: " .. name .. " X: " .. x .. " Y: " .. y)
--      end
--  end

-- FUNCTIONS --
-- addButton(mon, name, x, y, width, height, text, [func], [funcParam], [buttonColor], [textColor]) -> add a new button
-- removeButton(index) -> remove button
-- centerTextOnWindow(window, text) -> centers the text in a window
-- draw() -> draws all the buttons
-- toggleButton(button) -> toggles the colors: can be given as func to addButton
-- buttonClickEvent() -> check monitor and call checkButton when monitor is pressed
-- checkButton(x, y) -> check a if the coordinates are inside a button: returns on eventStack
-- printButtonInfo() -> printing all the information about all the buttons
-- initEventHandler(eventHandler) -> function that handles the events
-- initEventHandler(eventHandler, mainFunc) -> function that handles the events
-- startParallel(function1, function2) -> start two functions
-- startParallel(function1, function2, function3) -> start two functions
-- getMonitor()
-- setMonitor(monitor)
-- getScreenSize()
-- getButtonIndex()
-- getButton(index)
-- getFunc(index)
-- setFunc(index, func)
-- getFuncParam(index)
-- setFuncParam(index, funcParam)
-- getButtonColor(index)
-- setButtonColor(index, buttonColor)
-- getTextColor(index)
-- setTextColor(index, textColor)

local buttons={}

function addButton(mon, name, x, y, width, height, text, func, funcParam, buttonColor, textColor)
    print("Adding button...")
    print(name .. ": " .. text .. " (" .. x .. ", " .. y .. "),(" .. width .. ", " .. height .. ")")

    func = func or toggleButton
    params = {displayTime = 1, activeColor = colors.red}
    funcParam = funcParam or params
    buttonColor = buttonColor or colors.green
    textColor = textColor or colors.white

    local button = {}
    button["name"] = name
    button["buttonColor"] = buttonColor
    button["textColor"] = textColor
    button["text"] = text
    button["func"] = func
    button["funcParam"] = funcParam
    button["window"] = window.create(mon, x, y, width, height, false)
    button["window"].setTextColor(textColor)
    button["window"].setBackgroundColor(buttonColor)
    button["window"].clear()

    table.insert(buttons, button)
end
function removeButton(index)
    table.remove(index)
end
function centerTextOnWindow(window, text)
    local x, y = window.getPosition()
    local width, height = window.getSize()
    window.setCursorPos(math.ceil((width / 2) - (text:len() / 2) + 1), math.ceil(height / 2))
    window.write(text)
end
function draw()
    print("Starting drawing...")
    print("Length: ".. #buttons)
    for i = 1, #buttons do
        print("Drawing: " .. buttons[i]["name"])
        buttons[i]["window"].clear()
        centerTextOnWindow(buttons[i]["window"], buttons[i]["text"])
        buttons[i]["window"].setVisible(true)
    end
    print("Drawing done")
end
function toggleButton(button)
    button["window"].setBackgroundColor(button["funcParam"]["activeColor"])
    draw()
    sleep(button["funcParam"]["displayTime"])
    button["window"].setBackgroundColor(button["buttonColor"])
    draw()
end
function buttonClickEvent()
    while true do
        event, side, x, y = os.pullEvent("monitor_touch")
        checkButton(x, y)
    end
end
function checkButton(x, y)
    for i = 1, #buttons do
        local xButton, yButton = buttons[i]["window"].getPosition()
        local width, height = buttons[i]["window"].getSize()

        if x >= xButton and x <= xButton + width and y >= yButton and y <= yButton + height then
            os.queueEvent("button", buttons[i]["name"], x, y)

            buttons[i]["func"](buttons[i])
        end
    end
end
function printButtonInfo()
    for i = 1, #buttons do
        print("--Button: " .. buttons[i]["name"])
        print("X: " .. buttons[i]["x"] .. " Y: " .. buttons[i]["y"])
        print("Width: " .. buttons[i]["width"] .. " Height: " .. buttons[i]["height"])
        print("Text: " .. buttons[i]["text"])
    end
end
function initEventHandler(eventHandler)
    startParallel(ButtonAPI.buttonClickEvent, eventHandler)
end
function initEventHandler(eventHandler, mainFunc)
    startParallel(ButtonAPI.buttonClickEvent, eventHandler, mainFunc)
end
function startParallel(function1, function2)
    parallel.waitForAll(function1, function2)
end
function startParallel(function1, function2, function3)
    parallel.waitForAll(function1, function2, function3)
end
function getButtonIndex(buttonName)
    for i = 1, #buttons do
        if buttons[i]["name"] == buttonName then
            return i
        end
    end
end
function getButton(index)
    return buttons[index]
end
function getFunc(index)
    return getButton(index)["func"]
end
function setFunc(index, func)
    getButton(index)["func"] = func
end
function getFuncParam(index)
    return getButton(index)["funcParam"]
end
function setFuncParam(index, funcParam)
    getButton(index)["funcParam"] = funcParam
end
function getButtonColor(index)
    return getButton(index)["buttonColor"]
end
function setButtonColor(index, buttonColor)
    getButton(index)["buttonColor"] = buttonColor
    button["window"].setBackgroundColor(buttonColor)
end
function getTextColor(index)
    return getButton(index)["textColor"]
end
function setTextColor(index, textColor)
    getButton(index)["textColor"] = textColor
    button["window"].setBackgroundColor(buttonColor)
end