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--[[
Copyright (c) 2012 Matthias Richter
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
Except as contained in this notice, the name(s) of the above copyright holders
shall not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
]]--
local _M -- holds the module. needed to make widgetHit overridable
local x,y = 0,0
local down = false
local hot, active = nil, nil
local NO_WIDGET = {}
local function _NOP_() end
local function widgetHit(mouse, pos, size)
return mouse[1] >= pos[1] and mouse[1] <= pos[1] + size[1] and
mouse[2] >= pos[2] and mouse[2] <= pos[2] + size[2]
end
local function setHot(id) hot = id end
local function setActive(id) active = id end
local function isHot(id) return id == hot end
local function isActive(id) return id == active end
local function getHot() return hot end
local function updateWidget(id, pos, size, hit)
hit = hit or _M.widgetHit
if hit({x,y}, pos, size) then
setHot(id)
if not active and down then
setActive(id)
end
end
end
local function releasedOn(id)
return not down and isHot(id) and isActive(id)
end
local function beginFrame()
hot = nil
x,y = love.mouse.getPosition()
down = love.mouse.isDown('l')
end
local function endFrame()
if not down then -- released
setActive(nil)
elseif not active then -- clicked outside
setActive(NO_WIDGET)
end
end
local function disable()
_M.beginFrame = _NOP__
_M.endFrame = _NOP__
_M.updateWidget = _NOP__
end
local function enable()
_M.beginFrame = beginFrame
_M.endFrame = endFrame
_M.updateWidget = updateWidget
end
_M = {
widgetHit = widgetHit,
setHot = setHot,
getHot = getHot,
setActive = setActive,
isHot = isHot,
isActive = isActive,
updateWidget = updateWidget,
releasedOn = releasedOn,
beginFrame = beginFrame,
endFrame = endFrame,
disable = disable,
enable = enable,
}
-- metatable provides getters to x, y and down
return setmetatable(_M, {__index = function(_,k) return ({x = x, y = y, down = down})[k] end})
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