initial commit

luigi/layout.lua

@@ -0,0 +1,83 @@
+local ROOT = (...):gsub('[^.]*$', '')
+
+local Base = require(ROOT .. 'base')
+local Event = require(ROOT .. 'event')
+local Window = require(ROOT .. 'window')
+local Widget = require(ROOT .. 'widget')
+local Input = require(ROOT .. 'input')
+local Style = require(ROOT .. 'style')
+
+local Layout = Base:extend()
+
+local weakValueMeta = { __mode = 'v' }
+
+function Layout:constructor (data)
+    self.widgets = setmetatable({}, weakValueMeta)
+    self.root = Widget.create(self, data or {})
+    self:setStyle()
+    self:setTheme()
+end
+
+function Layout:setStyle (rules)
+    self.style = Style(rules or {}, 'id', 'style')
+end
+
+function Layout:setTheme (rules)
+    self.theme = Style(rules or {}, 'type')
+end
+
+function Layout:show ()
+    local root = self.root
+    local width = root.width
+    local height = root.height
+    local title = root.title
+    if not self.input then
+        self.input = Input(self)
+    end
+    if not self.window then
+        self.window = Window(self.input)
+    end
+    self.window:show(width, height, title)
+end
+
+function Layout:hide ()
+    self.window:hide()
+end
+
+-- Update the display. Call this after you change widget properties
+-- that affect display.
+function Layout:update (reshape)
+    self.window:update(reshape)
+end
+
+-- Get the innermost widget at a position, within a root widget.
+-- Should always return a widget since all positions are within
+-- the layout's root widget.
+function Layout:getWidgetAt (x, y, root)
+    local widget = root or self.root
+    local children = widget.children
+    local childCount = #children
+    -- Loop through in reverse, because siblings defined later in the tree
+    -- will overdraw earlier siblings.
+    for i = childCount, 1, -1 do
+        local child = children[i]
+        local inner = self:getWidgetAt(x, y, child)
+        if inner then return inner end
+    end
+    if widget:isAt(x, y) then return widget end
+    if widget == self.root then return widget end
+end
+
+-- Internal, called from Widget:new
+function Layout:addWidget (widget)
+    if widget.id then
+        self[widget.id] = widget
+    end
+    table.insert(self.widgets, widget)
+end
+
+-- event binders
+
+Event.injectBinders(Layout)
+
+return Layout