initial commit

luigi/renderer.lua

@@ -0,0 +1,144 @@
+local ROOT = (...):gsub('[^.]*$', '')
+
+local Base = require(ROOT .. 'base')
+local Event = require(ROOT .. 'event')
+local Font = require(ROOT .. 'font')
+
+local Renderer = Base:extend()
+
+function Renderer:renderBackground (widget, window)
+    local bg = widget.background
+    if not bg then return end
+    local bend = widget.bend
+    local x1, y1, x2, y2 = widget:getRectangle(true)
+    window:fill(x1, y1, x2, y2, bg, bend)
+end
+
+function Renderer:renderOutline (widget, window)
+    if not widget.outline then return end
+    local x1, y1, x2, y2 = widget:getRectangle(true)
+    window:outline(x1, y1, x2, y2, widget.outline)
+end
+
+local imageCache = {}
+
+local function loadImage (path)
+    if not imageCache[path] then
+        imageCache[path] = love.graphics.newImage(path)
+    end
+
+    return imageCache[path]
+end
+
+-- TODO: this function is a monster, fix it somehow
+function Renderer:renderIconAndText (widget, window)
+    local x1, y1, x2, y2 = widget:getRectangle(true, true)
+    local icon = widget.icon and loadImage(widget.icon)
+    local align = widget.align or ''
+    local padding = widget.padding or 0
+    local text = widget.text
+    local x, y, iconWidth, iconHeight
+
+    if icon then
+        iconWidth, iconHeight = icon:getWidth(), icon:getHeight()
+        -- horizontal alignment
+        if align:find('right') then
+            x = x2 - iconWidth
+        elseif align:find('center') then
+            x = x1 + (x2 - x1) / 2 - iconWidth / 2
+        else -- if align:find('left') then
+            x = x1
+        end
+
+        -- vertical alignment
+        if align:find('bottom') then
+            y = y2 - iconHeight
+        elseif align:find('middle') then
+            y = y1 + (y2 - y1) / 2 - iconHeight / 2
+        else -- if align:find('top') then
+            y = y1
+        end
+
+        --[[
+        if text and align:find('center') then
+            if align:find('bottom') then
+                y = y - textHeight - padding
+            elseif align:find('middle') then
+                y = y - (textHeight + padding) / 2
+            end
+        end
+        --]]
+
+        love.graphics.draw(icon, x, y)
+    end
+
+    -- render text
+    if not text then return end
+
+    if not widget.fontData then
+        widget.fontData = Font(widget.font, widget.fontSize, widget.textColor)
+    end
+
+    local font = widget.fontData
+
+    if icon then
+        if align:find('center') then
+            -- y1 = y1 + iconHeight + padding
+        elseif align:find('right') then
+            x2 = x2 - iconWidth - padding
+        else
+            x1 = x1 + iconWidth + padding
+        end
+    end
+
+    font:setWidth(x2 - x1)
+    if align:find('right') then
+     font:setAlignment('right')
+    elseif align:find('center') then
+     font:setAlignment('center')
+    elseif align:find('justify') then
+     font:setAlignment('justify')
+    else -- if align:find('left') then
+     font:setAlignment('left')
+    end
+
+    local textHeight = font:getWrappedHeight(text)
+
+    local x, y
+
+    -- vertical alignment
+    if align:find('bottom') then
+        y = y2 - textHeight
+    elseif align:find('middle') then
+        y = y2 - (y2 - y1) / 2 - textHeight / 2
+        if icon and align:find('center') then
+            y = y1 + (iconHeight + padding) / 2
+        end
+    else -- if align:find('top') then
+        y = y1
+        if icon and align:find('center') then
+            y = y1 + iconHeight + padding
+        end
+    end
+
+    x = math.floor(x1)
+    y = math.floor(y)
+
+    window:write(x, y, x1, y1, x2, y2, text, font)
+end
+
+function Renderer:renderChildren (widget)
+    for i, child in ipairs(widget.children) do self:render(child) end
+end
+
+function Renderer:render (widget)
+    Event.Display:emit(widget, {}, function()
+        local window = widget.layout.window
+        self:renderBackground(widget, window)
+        self:renderOutline(widget, window)
+        self:renderIconAndText(widget, window)
+        return self:renderChildren(widget)
+    end)
+end
+
+return Renderer