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114 lines
3.2 KiB
Lua
114 lines
3.2 KiB
Lua
--- Implements a scrollable slider widget
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--
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-- @classmod yui.Slider
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-- @copyright 2022, The DoubleFourteen Code Forge
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-- @author Lorenzo Cogotti, Andrea Pasquini
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--
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-- Slider widget receives the following callbacks: @{yui.Widget.WidgetCallbacks|onEnter}(), @{yui.Widget.WidgetCallbacks|onChange}(), @{yui.Widget.WidgetCallbacks|onLeave}().
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local BASE = (...):gsub('slider$', '')
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local Widget = require(BASE..'widget')
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local core = require(BASE..'core')
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local Slider = setmetatable({
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__call = function(cls, args) return cls:new(args) end
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}, Widget)
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Slider.__index = Slider
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--- Attributes accepted by the @{Slider} widget beyond the standard @{yui.Widget.WidgetAttributes|attributes}
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-- and @{yui.Widget.WidgetCallbacks|callbacks}.
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--
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-- @field min (number) min value of the slider
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-- @field max (number) max value of the slider
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-- @field vertical (boolean) true for vertical slider, false or nil for horizontal slider
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-- @field value (number) default value
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-- @field step (number) number of slider's steps
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-- @table SliderAttributes
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--- Slider constructor
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-- @param args (@{SliderAttributes}) widget attributes
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function Slider:new(args)
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self = setmetatable(args, self)
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self.vertical = self.vertical or false
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self.min = self.min or 0
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self.max = self.max or 1
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self.value = self.value or self.min
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self.step = self.step or (self.max - self.min) / 10
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return self
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end
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function Slider:onPointerInput(px,py, _, down)
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self:grabFocus()
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if not down then
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return
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end
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local x,y,w,h = self.x,self.y,self.w,self.h
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local fraction
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if self.vertical then
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fraction = math.min(1, math.max(0, (y+h - py) / h))
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else
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fraction = math.min(1, math.max(0, (px - x) / w))
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end
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local v = fraction*(self.max - self.min) + self.min
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if v ~= self.value then
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self.value = v
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self:onChange(v)
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end
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end
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function Slider:onActionInput(action)
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local up = self.vertical and 'up' or 'right'
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local down = self.vertical and 'down' or 'left'
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local handled = false
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if action[up] then
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self.value = math.min(self.max, self.value + self.step)
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handled = true
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elseif action[down] then
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self.value = math.max(self.min, self.value - self.step)
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handled = true
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end
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if handled then
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self:onChange(self.value)
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end
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return handled
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end
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function Slider:draw()
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local x,y,w,h = self.x,self.y,self.w,self.h
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local r = math.min(w,h) / 2.1
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local color, _, cornerRadius = core.themeForWidget(self)
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local c = core.colorForWidgetState(self, color)
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local fraction = (self.value - self.min) / (self.max - self.min)
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local xb, yb, wb, hb -- size of the progress bar
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if self.vertical then
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x, w = x + w*.25, w*.5
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xb, yb, wb, hb = x, y+h*(1-fraction), w, h*fraction
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else
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y, h = y + h*.25, h*.5
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xb, yb, wb, hb = x,y, w*fraction, h
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end
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core.drawBox(x,y,w,h, c, cornerRadius)
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core.drawBox(xb,yb,wb,hb, { bg = c.fg }, cornerRadius)
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if self:isFocused() then
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love.graphics.setColor(c.fg)
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if self.vertical then
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love.graphics.circle('fill', x+wb/2, yb, r)
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else
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love.graphics.circle('fill', x+wb, yb+hb/2, r)
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end
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end
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end
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return Slider
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