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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author ruki
-- @file label.lua
--
-- load modules
local log = require("ui/log")
local view = require("ui/view")
local event = require("ui/event")
local action = require("ui/action")
local curses = require("ui/curses")
local bit = require("base/bit")
-- define module
local label = label or view()
-- init label
function label:init(name, bounds, text)
-- init view
view.init(self, name, bounds)
-- init text
self:text_set(text)
-- init text attribute
self:textattr_set("black")
end
-- draw view
function label:on_draw(transparent)
-- draw background
view.on_draw(self, transparent)
-- get the text attribute value
local textattr = self:textattr_val()
-- draw text string
local str = self:text()
if str and #str > 0 and textattr then
self:canvas():attr(textattr):move(0, 0):putstrs(self:splitext(str))
end
end
-- get text
function label:text()
return self._TEXT
end
-- set text
function label:text_set(text)
-- set text
text = text or ""
local changed = self._TEXT ~= text
self._TEXT = text
-- do action
if changed then
self:action_on(action.ac_on_text_changed)
end
self:invalidate()
return self
end
-- get text attribute
function label:textattr()
return self:attr("textattr")
end
-- set text attribute, e.g. textattr_set("yellow onblue bold")
function label:textattr_set(attr)
return self:attr_set("textattr", attr)
end
-- get the current text attribute value
function label:textattr_val()
-- get text attribute
local textattr = self:textattr()
if not textattr then
return
end
-- no text background? use view's background
if self:background() and not textattr:find("on") then
textattr = textattr .. " on" .. self:background()
end
-- attempt to get the attribute value from the cache first
self._TEXTATTR = self._TEXTATTR or {}
local value = self._TEXTATTR[textattr]
if value then
return value
end
-- update the cache
value = curses.calc_attr(textattr:split("%s"))
self._TEXTATTR[textattr] = value
return value
end
-- split text by width
function label:splitext(text, width)
-- get width
width = width or self:width()
-- split text first
local result = {}
local lines = text:split('\n', {strict = true})
for idx = 1, #lines do
local line = lines[idx]
while #line > width do
local size = 0
local split_idx = 0
for p, c in utf8.codes(line) do
local w = utf8.width(c)
size = size + w
if size > width then
split_idx = p
break
end
end
if split_idx > 0 then
table.insert(result, line:sub(1, split_idx - 1))
line = line:sub(split_idx)
else
break
end
end
table.insert(result, line)
end
return result
end
-- return module
return label
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