944a250ec5
Useful if the ui is positioned behind the camera as opposed as in front of it. Signed-off-by: Saggi Mizrahi <ficoos@gmail.com>
110 lines
3.2 KiB
Lua
110 lines
3.2 KiB
Lua
--[[
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Copyright (c) 2012 Matthias Richter
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Except as contained in this notice, the name(s) of the above copyright holders
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shall not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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]]--
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local _M -- holds the module. needed to make widgetHit overridable
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local x,y = 0,0
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local down, downLast = false, false
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local hot, active = nil, nil
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local NO_WIDGET = {}
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local function _NOP_() end
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local function widgetHit(mouse, pos, size)
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return mouse[1] >= pos[1] and mouse[1] <= pos[1] + size[1] and
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mouse[2] >= pos[2] and mouse[2] <= pos[2] + size[2]
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end
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local function setHot(id) hot = id end
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local function setActive(id) active = id end
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local function isHot(id) return id == hot end
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local function isActive(id) return id == active end
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local function getHot() return hot end
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local function updateWidget(id, pos, size, hit)
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hit = hit or _M.widgetHit
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if hit({x,y}, pos, size) then
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setHot(id)
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if not active and down then
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setActive(id)
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end
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end
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end
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local function releasedOn(id)
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return not down and isHot(id) and isActive(id) and downLast
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end
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local function beginFrame()
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hot = nil
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x,y = _M.getMousePosition()
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downLast = down
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down = false
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for _,btn in ipairs{'l', 'm', 'r'} do
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down = down or (love.mouse.isDown(btn) and btn)
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end
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end
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local function endFrame()
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if not down then -- released
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setActive(nil)
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elseif not active then -- clicked outside
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setActive(NO_WIDGET)
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end
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end
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local function disable()
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_M.beginFrame = _NOP_
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_M.endFrame = _NOP_
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_M.updateWidget = _NOP_
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end
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local function enable()
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_M.beginFrame = beginFrame
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_M.endFrame = endFrame
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_M.updateWidget = updateWidget
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end
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_M = {
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widgetHit = widgetHit,
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setHot = setHot,
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getHot = getHot,
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setActive = setActive,
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isHot = isHot,
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isActive = isActive,
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updateWidget = updateWidget,
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releasedOn = releasedOn,
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beginFrame = beginFrame,
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endFrame = endFrame,
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disable = disable,
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enable = enable,
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getMousePosition = love.mouse.getPosition
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}
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-- metatable provides getters to x, y and down
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return setmetatable(_M, {__index = function(_,k) return ({x = x, y = y, down = down})[k] end})
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