layouts.lua

package.loaded.utils = nil
local utils = require "utils"
local subclass = utils.subclass
local classInstantiate = utils.classInstantiate


local Layout = {
  elements = {},
  margin = 6,
}


function Layout:update()
  if self.game.updateAddresses then
    -- Update dynamic addresses (usually, pointers that can move)
    self.game:updateAddresses()
  end

  for _, element in pairs(self.elements) do
    -- Update elements which are not hidden and have an update function
    if element:getVisible() and element.update then element:update() end
  end

  if self.autoPositioningActive and not self.autoPositioningDone then
    -- Auto-positioning window elements should be done
    -- once we've added valid content to the labels for the first time,
    -- so that we get accurate label sizes.
    -- Thus this step is done at the end of the first update(),
    -- rather than in init().
    self:autoPositionElements()
    self.autoPositioningDone = true
  end
end


function Layout:activateAutoPositioningX(positioningType)
  -- Auto-position layout elements left to right.
  self.autoPositioningActive = true
  self.autoPositioningDone = false
  self.autoPositioningCoord = 'x'
  self.autoPositioningType = positioningType or 'fill'
end
function Layout:activateAutoPositioningY(positioningType)
  -- Auto-position layout elements top to bottom.
  self.autoPositioningActive = true
  self.autoPositioningDone = false
  self.autoPositioningCoord = 'y'
  self.autoPositioningType = positioningType or 'fill'
end


-- Figure out a working set of positions for the window elements.
--
-- Positions are calculated based on the window size and element sizes,
-- so that the elements get evenly spaced from end to end of the window.
function Layout:autoPositionElements()
  local function getElementLength(element_)
    if self.autoPositioningCoord == 'x' then return element_:getWidth()
    else return element_:getHeight() end
  end
  local function getWindowLength()
    if self.autoPositioningCoord == 'x' then return self.window:getWidth()
    else return self.window:getHeight() end
  end
  local function getElementOtherCoordPos(element_)
    if self.autoPositioningCoord == 'x' then return element_:getTop()
    else return element_:getLeft() end
  end
  local function applyAutoPosition(element_, pos_)
    -- Apply the auto-calculated position coordinate while maintaining the
    -- other coordinate.
    if self.autoPositioningCoord == 'x' then
      element_:setPosition(pos_, element_:getTop())
    else
      element_:setPosition(element_:getLeft(), pos_)
    end
  end

  -- Only deal with elements that aren't hidden from view.
  local elements = {}
  for _, element in pairs(self.elements) do
    if element:getVisible() then
      table.insert(elements, element)
    end
  end

  -- Figure out the total length of the elements if they were put
  -- side by side without any spacing.
  local lengthSum = 0
  for _, element in pairs(elements) do
    lengthSum = lengthSum + getElementLength(element)
  end

  local minPos = nil
  local elementSpacing = nil
  if self.autoPositioningType == 'fill' then
    -- Have a margin at each end of the window,
    -- and space out the elements uniformly.
    --
    -- It's possible for the spacing to be negative, meaning elements will
    -- overlap. The layout specification should fix this situation by making the
    -- window bigger.
    minPos = self.margin
    local maxPos = getWindowLength() - self.margin
    local numSpaces = #(elements) - 1
    elementSpacing = (maxPos - minPos - lengthSum) / (numSpaces)
  elseif self.autoPositioningType == 'compact' then
    -- Have a margin at the start of the window,
    -- and position the elements compactly one after the other from there.
    minPos = self.margin
    elementSpacing = self.margin
  end

  local currentPos = minPos
  for _, element in pairs(elements) do
    applyAutoPosition(element, currentPos)

    currentPos = currentPos + getElementLength(element) + elementSpacing
  end
end


function Layout:openToggleDisplayWindow()
  -- Create a window
  local window = createForm(true)

  -- Add checkboxes and associated labels
  local checkboxes = {}
  local toggleableElements = {}
  local currentY = self.margin
  for _, element in pairs(self.elements) do
    if element.checkboxLabel then
      local checkbox = createCheckBox(window)
      table.insert(checkboxes, checkbox)
      table.insert(toggleableElements, element)

      -- Initialize the checkbox according to the element's visibility.
      -- Note that cbChecked is a Cheat Engine defined global value.
      if element:getVisible() then
        checkbox:setState(cbChecked)
      end

      checkbox:setPosition(self.margin, currentY)
      checkbox:setCaption(element.checkboxLabel)
      local font = checkbox:getFont()
      font:setSize(9)

      currentY = currentY + 20
    end
  end

  -- Add an OK button in the window, which would apply the checkbox values
  -- and close the window
  local okButton = createButton(window)
  okButton:setPosition(100, currentY)
  okButton:setCaption("OK")
  okButton:setSize(30, 25)

  local okAction = utils.curry(
    self.toggleDisplayOKAction, self, window, toggleableElements, checkboxes)
  okButton:setOnClick(okAction)

  -- Add a Cancel button in the window, which would just close the window
  local cancelButton = createButton(window)
  cancelButton:setPosition(140, currentY)
  cancelButton:setCaption("Cancel")
  cancelButton:setSize(50, 25)
  cancelButton:setOnClick(utils.curry(window.close, window))

  window:setSize(200, currentY + 30)
  window:centerScreen()
  window:setCaption("Elements to show")
end

function Layout:toggleDisplayOKAction(window, toggleableElements, checkboxes)
  -- Show/hide each toggle-able element based on checkbox values
  for n = 1, #toggleableElements do
    toggleableElements[n]:setVisible(checkboxes[n]:getState() == cbChecked)
  end

  -- Trigger another run of auto-positioning
  self.autoPositioningDone = false

  -- Close the checkboxes window
  window:close()
end


function Layout:setBreakpointUpdateMethod()
  self.updateMethod = 'breakpoint'
end
function Layout:setUpdatesPerSecond(timesPerSecond)
  self.updateMethod = 'timer'
  -- updateTimeInterval is measured in milliseconds
  self.updateTimeInterval = 1000/timesPerSecond
end
function Layout:setButtonUpdateMethod(updateButton)
  self.updateMethod = 'button'
  self.updateButton = updateButton
end



function Layout:addElement(creationCallable, passedOptions)
  local options = {}
  -- First apply default options
  if self.labelDefaults then
    utils.updateTable(options, self.labelDefaults)
  end
  -- Then apply passed-in options, replacing default options of the same keys
  if passedOptions then
    utils.updateTable(options, passedOptions)
  end

  local element = creationCallable(options)

  element:setPosition(options.x or self.margin, options.y or self.margin)
  element.checkboxLabel = options.checkboxLabel or nil

  table.insert(self.elements, element)
  return element
end



local SimpleElement = {
  uiObj = nil,
  update = nil,
}

function SimpleElement:getWidth() return self.uiObj:getWidth() end
function SimpleElement:getHeight() return self.uiObj:getHeight() end
function SimpleElement:getLeft() return self.uiObj:getLeft() end
function SimpleElement:getTop() return self.uiObj:getTop() end
function SimpleElement:setPosition(x, y) self.uiObj:setPosition(x, y) end
function SimpleElement:getVisible() return self.uiObj:getVisible() end
function SimpleElement:setVisible(b) self.uiObj:setVisible(b) end



local function applyFontOptions(uiObj, options)
  local font = uiObj:getFont()
  -- Font size seems to be mandatory in CE; the others aren't
  font:setSize(options.fontSize or 12)
  if options.fontName ~= nil then font:setName(options.fontName) end
  if options.fontColor ~= nil then font:setColor(options.fontColor) end
end



local LayoutLabel = subclass(SimpleElement)

function LayoutLabel:setCaption(c) self.uiObj:setCaption(c) end

function LayoutLabel:init(window, options)
  options = options or {}
  options.text = options.text or ""

  self.displayFuncs = {}

  -- Call the Cheat Engine function to create a label.
  self.uiObj = createLabel(window)
  self:setCaption(options.text)

  applyFontOptions(self.uiObj, options)
end

function LayoutLabel:update()
  local displayTexts = {}
  for _, displayFunc in pairs(self.displayFuncs) do
    table.insert(displayTexts, displayFunc())
  end
  local labelDisplay = table.concat(displayTexts, '\n')
  self:setCaption(labelDisplay)
end


function Layout:addLabel(options)
  local creationCallable = utils.curry(
    classInstantiate, LayoutLabel, self.window)
  local label = self:addElement(creationCallable, options)

  self.lastAddedLabel = label
  return label
end


-- Add a text-displayable item to the current label.
function Layout:addItem(item, passedDisplayOptions)
  if not self.lastAddedLabel then
    error("Must add a label before adding an item.")
  end

  local displayOptions = {}
  -- First apply default options
  if self.itemDisplayDefaults then
    for k, v in pairs(self.itemDisplayDefaults) do displayOptions[k] = v end
  end
  -- Then apply passed-in options, replacing default options of the same keys
  if passedDisplayOptions then
    for k, v in pairs(passedDisplayOptions) do displayOptions[k] = v end
  end

  if tostring(type(item)) == 'string' then
    -- Assume the item is just a constant string to display directly.
    table.insert(
      self.lastAddedLabel.displayFuncs,
      utils.curry(function(s) return s end, item)
    )
  elseif tostring(type(item)) == 'function' then
    -- Assume the item is a function which returns the desired
    -- value as a string, and takes display options.
    table.insert(
      self.lastAddedLabel.displayFuncs,
      utils.curry(item, displayOptions)
    )
  else
    -- Assume the item is a table where item:display(displayOptions)
    -- would get the desired value as a string, while applying the options.
    table.insert(
      self.lastAddedLabel.displayFuncs,
      utils.curry(item.display, item, displayOptions)
    )
  end
end



-- This class is mostly redundant with Cheat Engine's defined Button class,
-- but we define our own LayoutButton (wrapping around CE's Button) for:
-- (1) consistency with other layout element classes
-- (2) not confusing CE's Button update() function with the update() function
-- our Layout class looks for in elements
local LayoutButton = subclass(SimpleElement)

function LayoutButton:setOnClick(f) self.uiObj:setOnClick(f) end
function LayoutButton:setCaption(c) self.uiObj:setCaption(c) end

function LayoutButton:init(window, text, options)
  options = options or {}

  self.uiObj = createButton(window)
  self:setCaption(text)

  applyFontOptions(self.uiObj, options)

  local buttonFontSize = self.uiObj:getFont():getSize()
  local buttonWidth = buttonFontSize * #text  -- Based on char count
  local buttonHeight = buttonFontSize * 1.8 + 6
  self.uiObj:setSize(buttonWidth, buttonHeight)
end

function Layout:addButton(text, options)
  local creationCallable = utils.curry(
    classInstantiate, LayoutButton, self.window, text)
  return self:addElement(creationCallable, options)
end



local StickInputImage = subclass(SimpleElement)

function StickInputImage:init(window, stickX, stickY, options)
  options = options or {}
  -- Line color; default = black
  local foregroundColor = options.foregroundColor or 0x000000
  local backgroundColor = options.backgroundColor or 0xF0F0F0
  -- Size of the image
  self.sizex = options.sizex or options.size or 100
  self.sizey = options.sizey or options.size or 100
  -- Thickness of lines drawn
  self.lineThickness = options.lineThickness or 2
  -- Min and max of the stickX and stickY value ranges
  self.max = options.max or 1
  self.min = options.min or -self.max
  -- Should diagonals be confined to a square or circle?
  -- Controller sticks are generally confined to a circle, but note
  -- that TAS input gets a full square range to use.
  -- However, most games should treat out-of-circle inputs as if they were
  -- clamped to a circle anyway.
  self.square = options.square or false

  self.uiObj = createImage(window)
  self.uiObj:setSize(self.sizex, self.sizey)

  self.canvas = self.uiObj:getCanvas()
  -- Brush: ellipse/rect fill
  self.canvas:getBrush():setColor(backgroundColor)
  -- Pen: ellipse/rect outline, line()
  self.canvas:getPen():setColor(foregroundColor)
  self.canvas:getPen():setWidth(self.lineThickness)
  -- Initialize the whole image with the brush color
  self.canvas:fillRect(0,0, self.sizex,self.sizey)

  self.stickX = stickX
  self.stickY = stickY
end

function StickInputImage:update()
  if not self.stickX:isValid() then return end

  local sizex = self.sizex
  local sizey = self.sizey

  -- Clear the image and redraw the outline.
  self.canvas:clear()
  if self.square then
    self.canvas:rect(1,1, sizex,sizey)
  else
    self.canvas:ellipse(0,0, sizex,sizey)
  end

  -- Draw a line indicating where the stick is currently positioned.

  local xCenter = sizex/2
  local yCenter = sizey/2
  local radius = sizex/2
  local xRaw = self.stickX:get()
  local yRaw = self.stickY:get()
  -- stickX and stickY range from min to max. Transform that to a range from
  -- 0 to width.
  -- stickY goes bottom to top while image coordinates go
  -- top to bottom, so we need to invert the Y pixel number.
  local xInZeroToOneRange = (xRaw - self.min) / (self.max - self.min)
  local yInZeroToOneRange = (yRaw - self.min) / (self.max - self.min)
  local xPixel = xInZeroToOneRange * sizex
  local yPixel = sizey - (yInZeroToOneRange * sizey)

  if not self.square then
    -- Confine the stick position to the circular range.
    local distanceFromCenter = math.sqrt(
      (xPixel - xCenter) * (xPixel - xCenter)
      + (yPixel - yCenter) * (yPixel - yCenter))
    if distanceFromCenter > radius then
      -- Position is outside the circle. Snap the position to the edge of
      -- the circle, preserving direction from center. (We assume this is
      -- how most circular-ranged games treat such inputs).
      xPixel = (xPixel - xCenter)*(radius / distanceFromCenter) + xCenter
      yPixel = (yPixel - yCenter)*(radius / distanceFromCenter) + yCenter
    end
  end

  -- Draw a line from the center to the stick position.
  self.canvas:line(xCenter,yCenter, xPixel,yPixel)
end


local AnalogTriggerInputImage = subclass(SimpleElement)

function AnalogTriggerInputImage:init(window, triggerL, triggerR, options)
  options = options or {}
  -- Line and meter-fill color; default = black
  self.foregroundColor = options.foregroundColor or 0x000000
  -- Background; should match the window color
  self.backgroundColor = 0xF0F0F0
  -- Size of the image
  self.width = options.width or 100
  self.height = options.height or 15
  -- Thickness of lines drawn
  self.lineThickness = options.lineThickness or 2
  -- Max value of the trigger range
  self.max = options.max or 1

  self.uiObj = createImage(window)
  self.uiObj:setSize(self.width, self.height)

  self.canvas = self.uiObj:getCanvas()
  -- Brush: ellipse/rect fill
  self.canvas:getBrush():setColor(self.backgroundColor)
  -- Pen: ellipse/rect outline, line()
  self.canvas:getPen():setColor(self.foregroundColor)
  self.canvas:getPen():setWidth(self.lineThickness)

  -- Fill the canvas with the background color
  self.canvas:fillRect(0,0, self.width,self.height)

  local gapBetweenMeters = math.floor(self.width / 20)
  -- Depending on whether the width and meter gap are odd/even, the gap will
  -- either be honored exactly or will be 1 greater than specified.
  self.meterOuterWidth = math.floor((self.width - gapBetweenMeters)/2)
  self.meterInnerWidth = self.meterOuterWidth - self.lineThickness
  self:redrawMeterOutlines()

  self.triggerL = triggerL
  self.triggerR = triggerR
end

function AnalogTriggerInputImage:redrawMeterOutlines()
  self.canvas:getBrush():setColor(self.backgroundColor)
  self.canvas:rect(1,1, self.meterOuterWidth,self.height)
  self.canvas:rect(self.width-self.meterOuterWidth,1, self.width,self.height)
end

function AnalogTriggerInputImage:update()
  if not self.triggerL:isValid() then return end

  self:redrawMeterOutlines()

  self.canvas:getBrush():setColor(self.foregroundColor)
  -- Left meter fill
  local fractionL = self.triggerL:get() / self.max
  self.canvas:fillRect(
    self.lineThickness/2 + self.meterInnerWidth*(1-fractionL), 1,
    self.lineThickness/2 + self.meterInnerWidth, self.height)
  -- Right meter fill
  local fractionR = self.triggerR:get() / self.max
  self.canvas:fillRect(
    self.width - (self.lineThickness/2 + self.meterInnerWidth),
    1,
    self.width - (self.lineThickness/2 + self.meterInnerWidth*(1-fractionR)),
    self.height)
end


local AnalogTwoSidedInputImage = subclass(SimpleElement)

function AnalogTwoSidedInputImage:init(window, analogInput, options)
  options = options or {}
  -- Line and meter-fill color; default = black
  self.foregroundColor = options.foregroundColor or 0x000000
  -- Background; should match the window color
  self.backgroundColor = 0xF0F0F0
  -- Size of the image
  self.width = options.width or 100
  self.height = options.height or 15
  -- Thickness of lines drawn
  self.lineThickness = options.lineThickness or 2
  -- Min and max value of the analog range
  self.max = options.max or 1
  self.min = options.min or -self.max

  self.uiObj = createImage(window)
  self.uiObj:setSize(self.width, self.height)

  self.canvas = self.uiObj:getCanvas()
  -- Brush: ellipse/rect fill
  self.canvas:getBrush():setColor(self.backgroundColor)
  -- Pen: ellipse/rect outline, line()
  self.canvas:getPen():setColor(self.foregroundColor)
  self.canvas:getPen():setWidth(self.lineThickness)

  self.meterInnerWidth = self.width - self.lineThickness

  self.analogInput = analogInput
end

function AnalogTwoSidedInputImage:update()
  if not self.analogInput:isValid() then return end

  -- Meter border and center
  self.canvas:getBrush():setColor(self.backgroundColor)
  self.canvas:rect(1,1, self.width/2,self.height)
  self.canvas:rect(self.width/2,1, self.width,self.height)

  -- Meter fill
  self.canvas:getBrush():setColor(self.foregroundColor)
  local fraction = (self.analogInput:get() - self.min) / (self.max - self.min)
  if fraction <= 0.5 then
    self.canvas:fillRect(
      self.lineThickness/2 + self.meterInnerWidth*fraction, 1,
      self.lineThickness/2 + self.meterInnerWidth/2, self.height)
  else
    self.canvas:fillRect(
      self.lineThickness/2 + self.meterInnerWidth/2, 1,
      self.lineThickness/2 + self.meterInnerWidth*fraction, self.height)
  end
end


function Layout:addImage(ImageClass, args, options)
  local creationCallable = utils.curry(
    classInstantiate, ImageClass, self.window, unpack(args))
  return self:addElement(creationCallable, options)
end



-- A UI element that holds other elements.

local CompoundElement = {
  elements = {},
  position = nil,
}

function CompoundElement:addElement(relativePosition, uiObj)
  table.insert(self.elements, {relativePosition=relativePosition, uiObj=uiObj})
end

function CompoundElement:getWidth()
  local width = 0
  for _, element in pairs(self.elements) do
    width = math.max(
      width, element.relativePosition[1] + element.uiObj:getWidth())
  end
  return width
end

function CompoundElement:getHeight()
  local height = 0
  for _, element in pairs(self.elements) do
    height = math.max(
      height, element.relativePosition[2] + element.uiObj:getHeight())
  end
  return height
end

function CompoundElement:getLeft()
  return self.position[1]
end
function CompoundElement:getTop()
  return self.position[2]
end

function CompoundElement:positionElements()
  for _, element in pairs(self.elements) do
    element.uiObj:setPosition(
      self.position[1] + element.relativePosition[1],
      self.position[2] + element.relativePosition[2]
    )
  end
end

function CompoundElement:setPosition(x, y)
  self.position = {x, y}
  self:positionElements()
end

function CompoundElement:getVisible()
  -- We'll assume we're either hiding all or none of the sub-elements,
  -- so checking just the first sub-element should suffice.
  return self.elements[1].uiObj:getVisible()
end

function CompoundElement:setVisible(b)
  for _, element in pairs(self.elements) do
    element.uiObj:setVisible(b)
  end
end



-- Writing stats to a file.

local FileWriter = subclass(CompoundElement)
utils.updateTable(FileWriter, {
  button = nil,
  timeLimitField = nil,
  secondsLabel = nil,
  timeElapsedLabel = nil,
  endFrame = nil,
  framerate = nil,

  currentlyTakingStats = false,
  currentFrame = nil,
  valuesTaken = nil,
})

function FileWriter:init(window, game, filename, outputStringGetter, options)
  options = options or {}

  self.framerate = game.framerate
  self.filename = filename
  self.outputStringGetter = outputStringGetter
  self:initializeUI(window, options)
end

function FileWriter:initializeUI(window, options)
  self.button = createButton(window)
  self.button:setCaption("Take stats")
  self.button:setOnClick(utils.curry(self.startTakingStats, self))

  self.timeLimitField = createEdit(window)
  self.timeLimitField.Text = "10"

  self.secondsLabel = classInstantiate(LayoutLabel, window, options)
  self.secondsLabel:setCaption("seconds")

  self.timeElapsedLabel = classInstantiate(LayoutLabel, window, options)
  -- Allow auto-layout to detect an appropriate width for this element
  -- even though it's not active yet. (Example display: 10.00)
  self.timeElapsedLabel:setCaption("     ")

  applyFontOptions(self.button, options)
  applyFontOptions(self.timeLimitField, options)

  -- Add the elements to the layout.
  local buttonX = 10
  local buttonFontSize = self.button:getFont():getSize()
  local buttonWidth = buttonFontSize * 10
  local buttonHeight = buttonFontSize * 2.0 + 8
  self:addElement({buttonX, 0}, self.button)
  self.button:setSize(buttonWidth, buttonHeight)

  local timeLimitFieldX = buttonX + buttonWidth + 5
  local timeLimitFieldFontSize = self.timeLimitField:getFont():getSize()
  local timeLimitFieldWidth = timeLimitFieldFontSize * 5
  local timeLimitFieldHeight = buttonFontSize * 1.5
  self:addElement({timeLimitFieldX, 0}, self.timeLimitField)
  self.timeLimitField:setSize(timeLimitFieldWidth, timeLimitFieldHeight)

  local secondsLabelX = timeLimitFieldX + timeLimitFieldWidth + 5
  local secondsLabelY = 3
  self:addElement({secondsLabelX, secondsLabelY}, self.secondsLabel)

  local timeElapsedLabelX = secondsLabelX + self.secondsLabel:getWidth() + 15
  local timeElapsedLabelY = 3
  self:addElement({timeElapsedLabelX, timeElapsedLabelY}, self.timeElapsedLabel)
end

function FileWriter:startTakingStats()
  -- Get the time limit from the field. If it's not a valid number,
  -- don't take any stats.
  local seconds = tonumber(self.timeLimitField.Text)
  if seconds == nil then return end
  self.endFrame = self.framerate * seconds

  self.currentlyTakingStats = true
  self.currentFrame = 1
  self.valuesTaken = {}

  -- Change the Start taking stats button to a Stop taking stats button
  self.button:setCaption("Stop stats")
  self.button:setOnClick(utils.curry(self.stopTakingStats, self))
  -- Disable the time limit field
  self.timeLimitField:setEnabled(false)
end

function FileWriter:takeStat()
  self.valuesTaken[self.currentFrame] = self.outputStringGetter()

  -- Display the current frame count
  self.timeElapsedLabel:setCaption(
    string.format("%.2f", self.currentFrame / self.framerate))

  self.currentFrame = self.currentFrame + 1
  if self.currentFrame > self.endFrame then
    self:stopTakingStats()
  end
end

function FileWriter:stopTakingStats()
  -- Collect the stats in string form and write them to a file.
  --
  -- This file will be created in either:
  -- (A) The same directory as the cheat table you have open.
  -- (B) The same directory as the Cheat Engine .exe file, it you don't
  --   have a cheat table open.
  local statsStr = table.concat(self.valuesTaken, "\n")
  local statsFile = io.open(self.filename, "w")
  statsFile:write(statsStr)
  statsFile:close()

  self.currentlyTakingStats = false
  self.currentFrame = nil
  self.valuesTaken = {}
  self.endFrame = nil

  self.button:setCaption("Take stats")
  self.button:setOnClick(utils.curry(self.startTakingStats, self))
  self.timeLimitField:setEnabled(true)

  self.timeElapsedLabel:setCaption("")
end

function FileWriter:update()
  if self.currentlyTakingStats then
    self:takeStat()
  end
end


function Layout:addFileWriter(
    item, filename, passedOutputOptions, initOptions)
  -- Create a callable that will get a display of the tracked value
  -- for file writing.
  local outputOptions = {nolabel=true}
  if passedOutputOptions then
    utils.updateTable(outputOptions, passedOutputOptions)
  end

  local outputStringGetter = nil
  if tostring(type(item)) == 'function' then
    -- We'll call the item (a function) to get the output string.
    outputStringGetter = item
  elseif item.display then
    -- We'll call the item's display() function to get the output string.
    outputStringGetter = utils.curry(item.display, item, outputOptions)
  else
    error("Don't know how to get file output from this item: "..tostring(item))
  end

  local creationCallable = utils.curry(
    classInstantiate, FileWriter,
    self.window, self.game, filename, outputStringGetter, initOptions)
  return self:addElement(creationCallable, options)
end



local EditableValue = subclass(CompoundElement)
utils.updateTable(EditableValue, {
  valueObj = nil,
  valueLabel = nil,
  editButton = nil,
})

function EditableValue:init(window, valueObj, options)
  options = options or {}

  self.valueObj = valueObj
  self:initializeUI(window, options)
end

function EditableValue:initializeUI(window, options)
  self.valueLabel = classInstantiate(LayoutLabel, window, options)

  self.editButton = createButton(window)
  self.editButton:setCaption("Edit")
  self.editButton:setOnClick(utils.curry(self.openEditWindow, self))

  self.listButton = createButton(window)
  self.listButton:setCaption("List")
  self.listButton:setOnClick(utils.curry(self.addAddressesToList, self))

  -- Set non-label font attributes.
  applyFontOptions(self.editButton, options)
  applyFontOptions(self.listButton, options)

  -- Add the elements to the layout.
  self:addElement({10, 3}, self.valueLabel)

  local buttonX = options.buttonX or 300
  local buttonFontSize = self.editButton:getFont():getSize()
  local buttonWidth = buttonFontSize * 4  -- 4 chars in both 'Edit' and 'List'
  local buttonHeight = buttonFontSize * 1.8 + 6

  self:addElement({buttonX, 0}, self.editButton)
  self.editButton:setSize(buttonWidth, buttonHeight)

  self:addElement({buttonX + buttonWidth + 4, 0}, self.listButton)
  self.listButton:setSize(buttonWidth, buttonHeight)
end

function EditableValue:update()
  self.valueLabel:setCaption(self.valueObj:display())
end

function EditableValue:openEditWindow()
  -- Create an edit window
  local window = createForm(true)
  window:setSize(400, 50)
  window:centerScreen()
  window:setCaption(self.valueObj:getEditWindowTitle())

  -- Add a text box with the current value
  local textField = createEdit(window)
  textField:setPosition(70, 10)
  textField:setSize(200, 20)
  textField.Text = self.valueObj:getEditFieldText()

  -- Add an OK button in the window, which would change the value
  -- to the text field contents, and close the window
  local okButton = createButton(window)
  okButton:setPosition(300, 10)
  okButton:setCaption("OK")
  okButton:setSize(30, 25)

  local okAction = utils.curry(
    self.editWindowOKAction, self, window, textField)
  okButton:setOnClick(okAction)

  -- Add a Cancel button in the window, which would just close the window
  local cancelButton = createButton(window)
  cancelButton:setPosition(340, 10)
  cancelButton:setCaption("Cancel")
  cancelButton:setSize(50, 25)
  cancelButton:setOnClick(utils.curry(window.close, window))

  -- Add a reset button, if applicable
  if self.valueObj.getResetValue then
    local resetButton = createButton(window)
    resetButton:setPosition(5, 10)
    resetButton:setCaption("Reset")
    resetButton:setSize(50, 25)
    local resetValue = function(valueObj, textField_)
      textField_.Text = valueObj:toStrForEditField(valueObj:getResetValue())
    end
    resetButton:setOnClick(utils.curry(resetValue, self.valueObj, textField))
  end

  -- Put the initial focus on the text field.
  textField:setFocus()
end

function EditableValue:editWindowOKAction(window, textField)
  local newValue = self.valueObj:strToValue(textField.Text)

  -- Do nothing if the entered value is empty or invalid
  if newValue == nil then return end

  self.valueObj:set(newValue)

  -- Delay for a bit first, because it seems that the
  -- write to the memory address needs a bit of time to take effect.
  sleep(50)
  -- Update the display
  self:update()
  -- Close the edit window
  window:close()
end

function EditableValue:addAddressesToList()
  local addressList = getAddressList()
  local entries = self.valueObj:getAddressListEntries()

  for _, entry in pairs(entries) do
    local memoryRecord = addressList:createMemoryRecord()

    -- setAddress doesn't work for some reason, despite being in CE's Help docs.
    -- So we'll just set the address property directly.
    memoryRecord.Address = entry.Address

    memoryRecord:setDescription(entry.Description)
    memoryRecord.Type = entry.Type

    if entry.Type == vtCustom then
      memoryRecord.CustomTypeName = entry.CustomTypeName
    elseif entry.Type == vtBinary then
      -- TODO: Can't figure out how to set Binary start bit and size.
      -- And this entry is useless if it's a 0-sized Binary display (which is
      -- default). So, best we can do is to make this entry a Byte...
      memoryRecord.Type = vtByte

      -- This didn't work.
      --memoryRecord.Binary.Startbit = entry.BinaryStartBit
      --memoryRecord.Binary.Size = entry.BinarySize
    end
  end
end


function Layout:addEditableValue(valueObj, options)
  local creationCallable = utils.curry(
    classInstantiate, EditableValue, self.window, valueObj)
  return self:addElement(creationCallable, options)
end



return {
  Layout = Layout,
  SimpleElement = SimpleElement,
  CompoundElement = CompoundElement,
  StickInputImage = StickInputImage,
  AnalogTriggerInputImage = AnalogTriggerInputImage,
  AnalogTwoSidedInputImage = AnalogTwoSidedInputImage,
}