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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 canvas.lua
--
-- load modules
local log = require("ui/log")
local point = require("ui/point")
local object = require("ui/object")
local curses = require("ui/curses")
-- define module
local line = line or object()
local canvas = canvas or object()
-- new canvas instance
function canvas:new(view, window)
-- create instance
self = self()
-- save view and window
self._view = view
self._window = window
assert(view and window, "cannot new canvas instance without view and window!")
-- set the default attributes
self:attr()
-- done
return self
end
-- clear canvas
function canvas:clear()
self._window:clear()
return self
end
-- move canvas to the given position
function canvas:move(x, y)
self._window:move(y, x)
return self
end
-- get the current position
function canvas:pos()
local y, x = self._window:getyx()
return x, y
end
-- get the canvas size
function canvas:size()
local y, x = self._window:getmaxyx()
return point {x + 1, y + 1}
end
-- get the canvas width
function canvas:width()
local _, x = self._window:getmaxyx()
return x + 1
end
-- get the canvas height
function canvas:height()
local y, _ = self._window:getmaxyx()
return y + 1
end
-- put character to canvas
function canvas:putchar(ch, n, vertical)
-- acs character?
if type(ch) == "string" and #ch > 1 then
ch = curses.acs(ch)
end
-- draw characters
n = n or 1
if vertical then
local x, y = self:pos()
while n > 0 do
self:move(x, y)
self._window:addch(ch)
n = n - 1
y = y + 1
end
else
while n > 0 do
self._window:addch(ch)
n = n - 1
end
end
return self
end
-- put a string to canvas
function canvas:putstr(str)
self._window:addstr(str)
return self
end
-- put strings to canvas
function canvas:putstrs(strs, startline)
-- draw strings
local sy, sx = self._window:getyx()
local ey, _ = self._window:getmaxyx()
for idx = startline or 1, #strs do
local _, y = self:pos()
self._window:addstr(strs[idx])
if y + 1 < ey and idx < #strs then
self:move(sx, y + 1)
else
break
end
end
return self
end
-- set canvas attributes
--
-- set attr: canvas:attr("bold")
-- add attr: canvas:attr("bold", true)
-- remove attr: canvas:attr("bold", false)
--
function canvas:attr(attrs, modify)
-- calculate the attributes
local attr = curses.calc_attr(attrs)
if modify == nil then
self._window:attrset(attr)
elseif modify == false then
self._window:attroff(attr)
else
self._window:attron(attr)
end
return self
end
-- return module
return canvas
|
