yui/widget.lua

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Lua
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2022-08-15 23:41:17 +02:00
local rectunion = require('lib.gear.rect').union
local Widget = {
__call = function(cls, args)
return cls.new(args)
end
}
Widget.__index = Widget
local function raise(widget)
local parent = widget.parent
-- A parent of a widget is necessarily a Layout
while parent ~= nil do
local stack = parent.stack
-- Move widget at the end of the stack, so it is rendered last.
for i,w in ipairs(stack) do
if w == widget then
table.remove(stack, i)
stack[#stack+1] = widget
break
end
end
-- Focus widget's container, if any
widget = parent
parent = widget.parent
end
end
function Widget:grabFocus()
local ui = self.ui
local focused = ui.focused
if focused == self then
return
end
if focused ~= nil then
-- Notify leave
focused.hovered = false
if focused.grabkeyboard then
if love.system.getOS() == 'Android' or love.system.getOS() == 'iOS' then
love.keyboard.setTextInput(false)
end
love.keyboard.setKeyRepeat(false)
end
focused:onLeave()
end
local wasHovered = self.hovered
self.hovered = true
if self.grabkeyboard then
love.keyboard.setTextInput(true, self.x,self.y,self.w,self.h)
love.keyboard.setKeyRepeat(true)
end
if not wasHovered then
-- First time hovered, notify enter
self:onEnter()
end
-- Raise widget
ui.focused = self
raise(self)
end
function Widget:isFocused()
return self.ui.focused == self
end
function Widget.recalculateBounds()
local widget = self.parent
while widget ~= nil do
local rx,ry,rw,rh = widget.x,widget.y,-1,-1
for _,w in ipairs(widget) do
rx,ry,rw,rh = rectunion(rx,ry,rw,rh, w.x,w.y,w.w,w.h)
end
widget.x = rx
widget.y = ry
widget.w = rw
widget.h = rh
widget = widget.parent
end
end
-- Helper for drawing
function Widget:colorForState()
if self.active then
return self.color.active
elseif self:isFocused() then
return self.color.hovered
else
return self.color.normal
end
end
-- Common NOP event handlers
function Widget:onHit() end
function Widget:onEnter() end
function Widget:onLeave() end
function Widget:onChange() end
-- NOP input event handlers
function Widget:onActionInput(action) end
function Widget:onPointerInput(x,y, clicked) end
-- NOP UI event handlers
function Widget:update(dt) end
function Widget:draw() end
return Widget