/ld27

-- Class: Mouse

-- This tracks the state of the mouse, i.e. its coordinates onscreen

-- and if a button was just pressed or released this frame.

--

-- See http://love2d.org/wiki/MouseConstant for a list of mouse button names.

--

-- Extends:

--		<Sprite>

Mouse = Sprite:extend{

	visible = false,

	-- private property: _thisFrame

	-- what buttons are pressed this frame

	-- if you are interested in this, use allPressed() instead

	_thisFrame = {},

	-- private property: lastFrame

	-- what mouse buttons were pressed last frame

	_lastFrame = {},

	new = function (self, obj)

		obj = self:extend(obj)

		the.mouse = obj

		love.mousepressed = function (x, y, button) obj:mousePressed(button) end

		love.mousereleased = function (x, y, button) obj:mouseReleased(button) end

		if obj.onNew then obj:onNew() end

		return obj

	end,

	-- Method: pressed

	-- Are *any* of the buttons passed held down this frame?

	--

	-- Arguments:

	--		string button descriptions passed as individual arguments;

	--		if none are passed, the left mouse button is assumed

	--

	-- Returns:

	-- 		boolean

	pressed = function (self, ...)

		local buttons = {...}

		if #buttons == 0 then buttons[1] = 'l' end

		for _, value in pairs(buttons) do

			if STRICT then

				assert(type(value) == 'string', 'all mouse buttons are strings; asked to check a ' .. type(value))

			end

			if self._thisFrame[value] then

				return true

			end

		end

		return false

	end,

	-- Method: justPressed

	-- Are *any* of the buttons passed pressed for the first time this frame?

	--

	-- Arguments:

	--		string button descriptions passed as individual arguments;

	--		if none are passed, the left mouse button is assumed

	--

	-- Returns:

	-- 		boolean

	justPressed = function (self, ...)

		local buttons = {...}

		if #buttons == 0 then buttons[1] = 'l' end

		for _, value in pairs(buttons) do

			if STRICT then

				assert(type(value) == 'string', 'all mouse buttons are strings; asked to check a ' .. type(value))

			end

			if self._thisFrame[value] and not self._lastFrame[value] then

				return true

			end

		end

		return false

	end,

	-- Method: released

	-- Are *all* of the buttons passed not held down this frame?

	--

	-- Arguments:

	--		string button descriptions passed as individual arguments;

	--		if none are passed, the left mouse button is assumed

	--

	-- Returns:

	-- 		boolean

	released = function (self, ...)

		local buttons = {...}

		if #buttons == 0 then buttons[1] = 'l' end

		for _, value in pairs(buttons) do

			if STRICT then

				assert(type(value) == 'string', 'all mouse buttons are strings; asked to check a ' .. type(value))

			end

			if self._thisFrame[value] then

				return false

			end

		end

		return true

	end,

	-- Method: justReleased

	-- Are *any* of the buttons passed released after being held last frame?

	--

	-- Arguments:

	--		string button descriptions passed as individual arguments;

	--		if none are passed, the left mouse button is assumed

	--

	-- Returns:

	-- 		boolean

	justReleased = function (self, ...)

		local buttons = {...}

		if #buttons == 0 then buttons[1] = 'l' end	

		for _, value in pairs(buttons) do

			if STRICT then

				assert(type(value) == 'string', 'all mouse buttons are strings; asked to check a ' .. type(value))

			end

			if self._lastFrame[value] and not self._thisFrame[value] then

				return true

			end

		end

		return false

	end,

	-- Method: allPressed

	-- Returns all buttons currently pressed this frame.

	--

	-- Arguments:

	--		none

	--

	-- Returns:

	--		string button descriptions; if nothing is pressed, nil

	allPressed = function (self)

		local result = {}

		for key, value in pairs(self._thisFrame) do

			if value then table.insert(result, key) end

		end

		return unpack(result)

	end,

	-- Method: allJustPressed

	-- Returns all buttons just pressed this frame.

	--

	-- Arguments:

	--		none

	--

	-- Returns:

	--		string button descriptions; if nothing is just pressed, nil

	allJustPressed = function (self)

		local result = {}

		for key, value in pairs(self._thisFrame) do

			if value and not self._lastFrame[key] then table.insert(result, key) end

		end

		return unpack(result)

	end,

	-- Method: allJustReleased

	-- Returns all buttons just released this frame.

	--

	-- Arguments:

	--		none

	--

	-- Returns:

	--		string buttons descriptions; if nothing is just pressed, nil

	allJustPressed = function (self)

		local result = {}

		for key, value in pairs(self._thisFrame) do

			if not value and self._lastFrame[key] then table.insert(result, key) end

		end

		return unpack(result)

	end,

	mousePressed = function (self, button)

		self._thisFrame[button] = true

	end,

	mouseReleased = function (self, button)

		-- we ignore wheel-related events to force the button

		-- to be detectable for at least one frame

		if button ~= 'wd' and button ~= 'wu' then

			self._thisFrame[button] = false

		end

	end,

	endFrame = function (self, elapsed)

		for key, value in pairs(self._thisFrame) do

			self._lastFrame[key] = value

		end

		-- now force mouse wheel buttons to be released

		self._thisFrame.wd = false

		self._thisFrame.wu = false

		self.x = love.mouse.getX() - the.app.inset.x

		self.y = love.mouse.getY() - the.app.inset.y

		Sprite.endFrame(self)

	end,

	update = function() end

}