add iconbutton widget

frontend/ui/widget/button.lua

@@ -2,7 +2,7 @@ require "ui/widget/container"
 
 --[[
 a button widget
-]]
+--]]
 Button = InputContainer:new{
 	text = nil, -- mandatory
 	preselect = false,

frontend/ui/widget/iconbutton.lua

@@ -0,0 +1,53 @@
+require "ui/widget/container"
+require "ui/widget/image"
+
+
+--[[
+Button with a big icon image! Designed for touch device
+--]]
+IconButton = InputContainer:new{
+	icon_file = "resources/info-confirm.png",
+	dimen = nil,
+	-- parent is used for UIManager:setDirty
+	parent = nil,
+	callback = function() end,
+}
+
+function IconButton:init()
+	self.image = ImageWidget:new{
+		file = self.icon_file
+	}
+
+	self.parent = self.parent or self
+	self.dimen = self.image:getSize()
+
+	self:initGesListener()
+
+	self[1] = self.image
+end
+
+function IconButton:initGesListener()
+	self.ges_events = {
+		TapClickButton = {
+			GestureRange:new{
+				ges = "tap",
+				range = self.dimen,
+			}
+		},
+	}
+end
+
+function IconButton:onTapClickButton()
+	self.image.invert = true
+	UIManager:setDirty(self.parent, "partial")
+	UIManager:scheduleIn(0.5, function()
+		self.image.invert = false
+		UIManager:setDirty(self.parent, "partial")
+	end)
+	self.callback()
+end
+
+function IconButton:onSetDimensions(new_dimen)
+	self.dimen = new_dimen
+end
+