91 lines
2.7 KiB
Lua
91 lines
2.7 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 key,code = nil, -1
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local focus, lastwidget
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local NO_WIDGET = {}
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local cycle = {
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-- binding = {key = key, modifier1, modifier2, ...} XXX: modifiers are OR-ed!
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prev = {key = 'tab', 'lshift', 'rshift'},
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next = {key = 'tab'},
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}
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local function pressed(...) key, code = ... end
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local function setFocus(id) focus = id end
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local function disable() focus = NO_WIDGET end
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local function clearFocus() focus = nil end
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local function hasFocus(id) return id == focus end
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local function tryGrab(id)
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if not focus then
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setFocus(id)
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end
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end
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local function isBindingDown(bind)
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local modifiersDown = #bind == 0 or love.keyboard.isDown(unpack(bind))
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return key == bind.key and modifiersDown
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end
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local function makeCyclable(id)
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tryGrab(id)
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if hasFocus(id) then
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if isBindingDown(cycle.prev) then
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setFocus(lastwidget)
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key = nil
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elseif isBindingDown(cycle.next) then
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setFocus(nil)
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key = nil
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end
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end
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lastwidget = id
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end
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local function beginFrame()
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-- for future use?
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end
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local function endFrame()
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key, code = nil, -1
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end
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return setmetatable({
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cycle = cycle,
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pressed = pressed,
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tryGrab = tryGrab,
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isBindingDown = isBindingDown,
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setFocus = setFocus,
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clearFocus = clearFocus,
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hasFocus = hasFocus,
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makeCyclable = makeCyclable,
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disable = disable,
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enable = clearFocus,
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beginFrame = beginFrame,
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endFrame = endFrame,
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}, {__index = function(_,k) return ({key = key, code = code})[k] end})
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