--- This is a description of what is expected in an element class.
---
--- **IMPORTANT**: Your class should inherit from *the* element class. This
--- means that any methods defined on that class need to be compatible with or
--- overridden by your class!
---
--- **Note**: The event handling functions only know about children of
--- `pop.screen` or children of an element *you* have called Pop.Box's event
--- handlers on.
--- @see element



--- **Optional**: Called during `pop.load()` with a reference to Pop.Box.
--- @function load
--- @tparam module pop The Pop.Box module.

--- **Optional**: Called during `pop.load()` to allow a custom wrapper function
--- to be created for your element class.
--- @function wrap
--- @tparam module pop The Pop.Box module.
--- @treturn function wrapper A function to be called to create an element of
--- this class instead of using `pop.create()`.

--- **Optional**: Called from `pop.update()` if `data.update`. Use it for any
--- time-based updates your element may need.
--- @function update
--- @tparam number dt The amount of time elapsed since `update` was last called.

--- **Optional**: Called from `pop.draw()` if `data.draw`. Use it to draw your
--- element.
--- @function draw

--- **Optional**: Called from `pop.mousemoved()` if in LOVE >= 0.10.0 and your
--- element is focused.
--- @function mousemoved
--- @tparam integer x The x coordinate of the mouse relative to the element.
--- @tparam integer y The y coordinate of the mouse relative to the element.
--- @tparam number dx The distance on the x axis the mouse was moved.
--- @tparam number dy The distance on the y axis the mouse was moved.
--- @treturn boolean Was the event handled?

--- **Optional**: Called from `pop.mousepressed()` if a mouse button was pressed
--- over your element.
---
--- **Note**: Your element must be visible (`data.draw` is true) for this method
--- to be called.
--- @function mousepressed
--- @tparam integer x The x coordinate of the mouse press relative to the
--- element.
--- @tparam integer y The y coordinate of the mouse press relative to the
--- element.
--- @tparam ?string|integer button The mouse button pressed. (Type varies by
--- LÖVE version.)
--- @treturn boolean Was the event handled?

--- **Optional**: Called from `pop.mousereleased()` if a mouse button was
--- pressed and then released over your element.
---
--- **Note**: Your element must be visible (`data.draw` is true) for this method
--- to be called.
--- @function clicked
--- @tparam integer x The x coordinate of the mouse click relative to the
--- element.
--- @tparam integer y The y coordinate of the mouse click relative to the
--- element.
--- @tparam ?string|integer button The mouse button clicked. (Type varies by
--- LÖVE version.)
--- @treturn boolean Was the event handled?

--- **Optional**: Called from `pop.mousereleased()` if a mouse button was
--- released over your element.
--- @function mousereleased
--- @tparam integer x The x coordinate of the mouse release relative to the
--- element.
--- @tparam integer y The y coordinate of the mouse release relative to the
--- element.
--- @tparam ?string|integer button The mouse button released. (Type varies by
--- LÖVE version.)
--- @treturn boolean Was the event handled?



--- The parent element of this element.
--- @tfield ?Element|false parent Parent element.

--- The child element(s) of this element.
--- @tfield table child All child elements.



--- Every object has a data field with pre-defined values. Any serializable data
--- should be saved in this field. Ideally, any Pop.Box element can be
--- reconstructed from its data field.
--- @table data
--- @tfield ?table|false|nil parent The parent of this element's data field. This
--- will **not** be serialized. This is the *only* exception to all data being
--- serialized.
--- @tfield table child All child elements' data fields.
--- @tfield integer x The left edge of your element.
--- @tfield integer y The top edge of your element.
--- @tfield integer w The width of your element.
--- @tfield integer h The height of your element.
--- @tfield boolean update Whether or not to update this element (and its
--- children).
--- @tfield boolean draw Whether or not to draw this element (and its children).



-- @todo Document keypressed method
-- @todo Document keyreleased method
-- @todo Document textinput method
-- @todo Document debugDraw method

pop.keypressed = (key) ->
    print "keypressed", key

    -- keypressed events must be on visible elements
    element = pop.focused
    if element and element.keypressed and element.data.draw
        return element.keypressed key

    return false

pop.keyreleased = (key) ->
    print "keyreleased", key

    -- keyreleased events are always called
    element = pop.focused
    if element and element.keyreleased
        return element.keyreleased key

    return false

pop.textinput = (text) ->
    print "textinput", text

    -- textinput events must be on visible elements
    element = pop.focused
    if element and element.textinput and element.data.draw
        return element.textinput text

    return false

pop.debugDraw = (element=pop.screen) ->
    if element.debugDraw
        element\debugDraw!