LUA 文本编辑相关

1 文本动画播放

实现文本打字机动画播放。

function TestNode:createLabel()
	local label = ccui.Text:create()
	label:setString("this is a test. \n a animation test")
	label:setFontSize(30)
	label:ignoreContentAdaptWithSize(false)
	self.label = label
	self:addChild(label)
end
function TestNode:playAni()
	-- split text to chars
	local str = self.label:getString()
	self.label:setString("")
	local charList = stringToChars(str) -- this func can be found in  http://blog.csdn.net/xiang__jiangsu/article/details/64126521
	-- create tmplabel to obtain node height
	local tmplabel = ccui.Text:create()
	tmplabel:setFontSize(self.label:getFontSize())
	tmplabel:setString("T")
	local nodeHeight = tmplabel:getContentSize().height
	-- convert chars to nodes
	local origCS = self.label:getContentSize()
	local width,height = 0,origCS.height
	for k,v in ipairs(charList) do
		-- if char is "\n", skip to next line
		if v == "\n" then
			width = 0
			height = height - nodeHeight
		else
			local curLabel = ccui.Text:create()
			curLabel:setFontSize(self.label:getFontSize())
			curLabel:setAnchorPoint(cc.p(0,1))
			curLabel:setPosition(cc.p(width,height))
			curLabel:setOpacity(0)
			self.label:addChild(curLabel)

			width = width + curLabel:getContentSize().width
		end
	end
	-- play ani
	local index = 0
	local wordSpeed = 10 -- 10 word one second
	local nodeChildren = self.label:getChildren()
	for k,v in ipairs(nodeChildren) do
		index = index + 1
		local delayTime = index/wordSpeed
		local delayAct = cc.DelayTime:create(delayTime)
		local fadeInAct = cc.FadeIn:create(0.2)
		v:runAction(cc.Sequence:create(delayAct,fadeInAct))
	end
end