南锋

南奔万里空,脱死锋镝余

cocos2dx-lua中Label文本设置自动换行

开发环境:cocos2dx 3.17
开发语言:lua
我们在开发过程中,经常会遇到字符串过长,显示的时候超出范围,这时我们可以设置Label自动换行

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
function FunSetLinefeed( strText, nLineWidth )		--文本,行宽
--读取每个字符做中文英文判断,并且记录大小
local nStep = 1
local index = 1
local ltabTextSize = {}
while true do
c = string.sub(strText, nStep, nStep)
b = string.byte(c)

if b > 128 then
ltabTextSize[index] = 3
nStep = nStep + 3
index = index + 1
else
ltabTextSize[index] = 1
nStep = nStep + 1
index = index + 1
end

if nStep > #strText then
break
end
end

--将字符按照限定行宽进行分组
local nLineCount = 1
local nBeginPos = 1
local lptrCurText = nil
local ltabText = {}
local nCurSize = 0
for i = 1, index - 1 do
nCurSize = nCurSize + ltabTextSize[i]
if nCurSize > nLineWidth and nLineCount< math.ceil(#strText/nLineWidth) then
nCurSize = nCurSize - ltabTextSize[i]
ltabText[nLineCount] = string.sub( strText, nBeginPos, nBeginPos + nCurSize - 1 )
nBeginPos = nBeginPos + nCurSize
nCurSize = ltabTextSize[i]
nLineCount = nLineCount + 1
end
if nLineCount == math.ceil(#strText/nLineWidth) then
ltabText[nLineCount] = string.sub( strText, nBeginPos, #strText)
end
end
-- for i = 1, nLineCount - 1 do
for i = 1, nLineCount do
if lptrCurText == nil then
lptrCurText = ltabText[i]
else
lptrCurText = lptrCurText .. "\n" .. ltabText[i]
end
end
return lptrCurText
end