121 lines
2.7 KiB
Lua
121 lines
2.7 KiB
Lua
local rectunion = require('lib.gear.rect').union
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local Widget = {
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__call = function(cls, args) return cls.new(args) end
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}
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Widget.__index = Widget
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local function raise(widget)
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local parent = widget.parent
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-- A parent of a widget is necessarily a Layout
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while parent ~= nil do
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local stack = parent.stack
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-- Move widget at the end of the stack, so it is rendered last.
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for i,w in ipairs(stack) do
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if w == widget then
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table.remove(stack, i)
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stack[#stack+1] = widget
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break
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end
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end
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-- Focus widget's container, if any
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widget = parent
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parent = widget.parent
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end
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end
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function Widget:grabFocus()
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local ui = self.ui
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local focused = ui.focused
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if focused == self then
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return
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end
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if focused ~= nil then
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-- Notify leave
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focused.hovered = false
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-- Widget specific focus loss
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focused:loseFocus()
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-- Event handler
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focused:onLeave()
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if focused.grabkeyboard then
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-- If focused widget stole input,
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-- then drop current input snapshot, since
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-- those events should have been already
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-- managed directly
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ui.device:snapshot()
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end
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end
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local wasHovered = self.hovered
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self.hovered = true
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if not wasHovered then
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-- First time hovered, notify enter
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self:gainFocus()
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self:onEnter()
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end
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-- Raise widget
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ui.focused = self
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raise(self)
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end
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function Widget:isFocused()
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return self.ui.focused == self
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end
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function Widget.recalculateBounds()
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local widget = self.parent
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while widget ~= nil do
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local rx,ry,rw,rh = widget.x,widget.y,-1,-1
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for _,w in ipairs(widget) do
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rx,ry,rw,rh = rectunion(rx,ry,rw,rh, w.x,w.y,w.w,w.h)
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end
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widget.x = rx
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widget.y = ry
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widget.w = rw
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widget.h = rh
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widget = widget.parent
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end
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end
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-- Helper for drawing
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function Widget:colorForState()
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if self.active then
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return self.color.active
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elseif self:isFocused() then
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return self.color.hovered
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else
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return self.color.normal
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end
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end
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-- NOP hooks for UI internal use
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function Widget:loseFocus() end
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function Widget:gainFocus() end
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-- NOP event handlers, publicly overridable
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function Widget:onHit() end
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function Widget:onEnter() end
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function Widget:onLeave() end
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function Widget:onChange() end
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-- NOP input event handlers
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function Widget:onActionInput(action) end
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function Widget:onPointerInput(x,y, clicked) end
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-- NOP UI event handlers
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function Widget:update(dt) end
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function Widget:draw() end
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return Widget
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