Added generic layout class and HBox.

src/ui/layout.lua

@@ -0,0 +1,96 @@
+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local make_class = require 'src.utils.classes'
+local UIElement  = require 'src.ui.element'
+
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local Layout = make_class(UIElement)
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function Layout:_init(x, y, w, h, spacing, float)
+    UIElement._init(self, x, y, float)
+    self.x        = x ~= nil and x or 0
+    self.y        = y ~= nil and y or 0
+    self.w        = w
+    self.h        = h
+    self.s        = spacing ~= nil and spacing or 10
+    self.elements = {}
+end
+
+
+function Layout:add(element)
+    table.insert(self.elements, element)
+end
+
+
+function Layout:load()
+    -- Load required assets if needed and then compute the coordinates of each button.
+    for _, v in pairs(self.elements) do
+        if v.is_a[UIElement] then
+            v:load()
+        end
+    end
+
+    self:set_dimensions()
+end
+
+
+function Layout:unload()
+    for _, v in pairs(self.elements) do
+        if v.is_a[UIElement] then
+            v:unload()
+        end
+    end
+end
+
+
+function Layout:update(dt)
+    for _, v in pairs(self.elements) do
+        v:update(dt)
+    end
+end
+
+
+function Layout:draw()
+    for _, v in pairs(self.elements) do
+        v:draw()
+    end
+end
+
+
+function Layout:mousemoved(x, y, dx, dy)
+    for _, v in pairs(self.elements) do
+        v:mousemoved(x, y, dx, dy)
+    end
+end
+
+
+function Layout:mousepressed(x, y, btn)
+    for _, v in pairs(self.elements) do
+        v:mousepressed(x, y, btn)
+    end
+end
+
+
+function Layout:mousereleased(x, y, btn)
+    for _, v in pairs(self.elements) do
+        v:mousereleased(x, y, btn)
+    end
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return Layout