ui overhaul

sys/apis/ui/components/Button.lua

@@ -0,0 +1,66 @@
+local class = require('class')
+local UI    = require('ui')
+local Util  = require('util')
+
+local colors = _G.colors
+
+UI.Button = class(UI.Window)
+UI.Button.defaults = {
+	UIElement = 'Button',
+	text = 'button',
+	backgroundColor = colors.lightGray,
+	backgroundFocusColor = colors.gray,
+	textFocusColor = colors.white,
+	textInactiveColor = colors.gray,
+	textColor = colors.black,
+	centered = true,
+	height = 1,
+	focusIndicator = ' ',
+	event = 'button_press',
+	accelerators = {
+		space = 'button_activate',
+		enter = 'button_activate',
+		mouse_click = 'button_activate',
+	}
+}
+function UI.Button:setParent()
+	if not self.width and not self.ex then
+		self.width = #self.text + 2
+	end
+	UI.Window.setParent(self)
+end
+
+function UI.Button:draw()
+	local fg = self.textColor
+	local bg = self.backgroundColor
+	local ind = ' '
+	if self.focused then
+		bg = self.backgroundFocusColor
+		fg = self.textFocusColor
+		ind = self.focusIndicator
+	elseif self.inactive then
+		fg = self.textInactiveColor
+	end
+	local text = ind .. self.text .. ' '
+	if self.centered then
+		self:clear(bg)
+		self:centeredWrite(1 + math.floor(self.height / 2), text, bg, fg)
+	else
+		self:write(1, 1, Util.widthify(text, self.width), bg, fg)
+	end
+end
+
+function UI.Button:focus()
+	if self.focused then
+		self:scrollIntoView()
+	end
+	self:draw()
+end
+
+function UI.Button:eventHandler(event)
+	if event.type == 'button_activate' then
+		self:emit({ type = self.event, button = self })
+		return true
+	end
+	return false
+end