yui/choice.lua

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--- Implements a multi-choice widget
--
-- @classmod yui.Choice
-- @copyright 2022, The DoubleFourteen Code Forge
-- @author Lorenzo Cogotti, Andrea Pasquini
--
-- Multi-choice widget receives the following callbacks: @{yui.Widget.WidgetCallbacks|onEnter}(), @{yui.Widget.WidgetCallbacks|onChange}(), @{yui.Widget.WidgetCallbacks|onLeave}().
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local BASE = (...):gsub('choice$', '')
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local Widget = require(BASE..'widget')
local core = require(BASE..'core')
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local clamp = require('lib.gear.algo').clamp
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local shadowtext = require 'lib.gear.shadowtext'
local T = require('lib.moonspeak').translate
local Choice = setmetatable({
__call = function(cls, args) return cls:new(args) end
}, Widget)
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Choice.__index = Choice
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--- Attributes accepted by the @{Choice} widget beyond the standard @{yui.Widget.WidgetAttributes|attributes}
-- and @{yui.Widget.WidgetCallbacks|callbacks}.
--
-- @field choices (table) available choices list
-- @field nowrap (boolean) disable choices wrapping
-- @field[opt='center'] valign (string) vertical alignment 'top', 'bottom', 'center'
-- @field[opt='center'] align (string) horizontal alignment, 'left', 'center', 'right'
-- @field notranslate (boolean) don't translate text
-- @table ChoiceAttributes
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--- Choice constructor
-- @param args (@{ChoiceAttributes}) widget attributes
function Choice:new(args)
self = setmetatable(args, self)
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self.align = self.align or 'center'
self.valign = self.valign or 'center'
self.hovered = false
self.choices = self.choices or { "" }
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self.nowrap = self.nowrap or #self.choices < 2
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self.index = 1 -- by default
for i,choice in ipairs(self.choices) do
-- Expand shorthands
if type(choice) ~= 'table' then
choice = {
text = tostring(choice),
notranslate = type(choice) ~= 'string',
value = choice
}
self.choices[i] = choice
end
-- Mark default choice if needed
if choice.value == self.default then
self.index = i
end
-- Translate choice
if not (self.notranslate or choice.notranslate) then
choice.text = T(choice.text)
end
end
return self
end
function Choice:checkIndex()
if self.nowrap then
self.index = clamp(self.index, 1, #self.choices)
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else
if self.index < 1 then
self.index = #self.choices
end
if self.index > #self.choices then
self.index = 1
end
end
end
function Choice:onActionInput(action)
local oldindex = self.index
local handled = false
-- Change choice
if action.left then
self.index = oldindex - 1
handled = true
end
if action.right then
self.index = oldindex + 1
handled = true
end
if not handled then
return false
end
-- Apply wrapping
self:checkIndex()
-- Fire event if necessary
if oldindex ~= self.index then
self:onChange(self.choices[self.index])
end
return true
end
function Choice:onPointerInput(px,_, clicked)
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self:grabFocus()
if not clicked then
return
end
local mx = px - self.x
local oldindex = self.index
-- Test whether arrows are hit
-- NOTE: don't care about arrows being disabled, checkIndex() will fix that.
if mx <= self.h+2 then
self.index = self.index - 1
elseif mx >= self.w - self.h-2 then
self.index = self.index + 1
end
self:checkIndex()
if oldindex ~= self.index then
self:onChange(self.choices[self.index])
end
end
function Choice:draw()
local x,y,w,h = self.x,self.y,self.w,self.h
local color, font, cornerRadius = core.themeForWidget(self)
local c = core.colorForWidgetState(self, color)
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core.drawBox(x,y,w,h, c, cornerRadius)
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if self.ui.focused == self then
-- draw < and > arrows, desaturate color if arrow is disabled
local cc = color.hovered
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love.graphics.setLineStyle('smooth')
love.graphics.setLineWidth(3)
love.graphics.setLineJoin('bevel')
local r, g, b = cc.fg[1], cc.fg[2], cc.fg[3]
local a = (self.nowrap and self.index == 1) and 0.4 or 1
love.graphics.setColor(r,g,b,a)
love.graphics.line(x+h*.8,y+h*.2, x+h*.5,y+h*.5, x+h*.8,y+h*.8)
a = (self.nowrap and self.index == #self.choices) and 0.4 or 1
love.graphics.setColor(r,g,b,a)
love.graphics.line(x+w-h*.8,y+h*.2, x+w-h*.5,y+h*.5, x+w-h*.8,y+h*.8)
end
-- draw text
local text = self.choices[self.index].text
y = y + core.verticalOffsetForAlign(self.valign, font, h)
love.graphics.setColor(c.fg)
love.graphics.setFont(font)
shadowtext.printf(text, x+h+2, y, w-2*(h + 2), self.align)
end
return Choice