move apis into rom/modules/main for shell compatibility

sys/modules/opus/ui/components/TabBar.lua

@@ -0,0 +1,45 @@
+local class = require('opus.class')
+local UI    = require('opus.ui')
+local Util  = require('opus.util')
+
+local colors = _G.colors
+
+UI.TabBar = class(UI.MenuBar)
+UI.TabBar.defaults = {
+	UIElement = 'TabBar',
+	buttonClass = 'TabBarMenuItem',
+	selectedBackgroundColor = colors.cyan,
+}
+function UI.TabBar:enable()
+	UI.MenuBar.enable(self)
+	if not Util.find(self.children, 'selected', true) then
+		local menuItem = self:getFocusables()[1]
+		if menuItem then
+			menuItem.selected = true
+		end
+	end
+end
+
+function UI.TabBar:eventHandler(event)
+	if event.type == 'tab_select' then
+		local selected, si = Util.find(self.children, 'uid', event.button.uid)
+		local previous, pi = Util.find(self.children, 'selected', true)
+
+		if si ~= pi then
+			selected.selected = true
+			if previous then
+				previous.selected = false
+				self:emit({ type = 'tab_change', current = si, last = pi, tab = selected })
+			end
+		end
+		UI.MenuBar.draw(self)
+	end
+	return UI.MenuBar.eventHandler(self, event)
+end
+
+function UI.TabBar:selectTab(text)
+	local menuItem = Util.find(self.children, 'text', text)
+	if menuItem then
+		menuItem.selected = true
+	end
+end