mirror of https://github.com/Hilbis/Hilbish
89 lines
2.2 KiB
Lua
89 lines
2.2 KiB
Lua
-- Greenhouse is a simple text scrolling handler for terminal programs.
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-- The idea is that it can be set a region to do its scrolling and paging
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-- job and then the user can draw whatever outside it.
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-- This reduces code duplication for the message viewer
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-- and flowerbook.
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local ansikit = require 'ansikit'
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local terminal = require 'terminal'
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local Object = require 'nature.object'
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local Greenhouse = Object:extend()
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function Greenhouse:new(sink)
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local size = terminal.size()
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self.region = size
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self.start = 1
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self.offset = 1
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self.sink = sink
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self.pages = {}
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self.curPage = 1
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return self
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end
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function Greenhouse:addPage(page)
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table.insert(self.pages, page)
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end
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function Greenhouse:updateCurrentPage(text)
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local page = self.pages[self.curPage]
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page:setText(text)
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end
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function Greenhouse:draw()
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local lines = self.pages[self.curPage].lines
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self.sink:write(ansikit.getCSI(self.start .. ';1', 'H'))
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self.sink:write(ansikit.getCSI(2, 'J'))
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-- the -2 negate is for the command and status line
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for i = self.offset, self.offset + (self.region.height - self.start) - 2 do
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if i > #lines then break end
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self.sink:writeln('\r' .. lines[i]:gsub('\t', ' '):sub(0, self.region.width - 2))
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end
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self.sink:write '\r'
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self.sink:write(ansikit.getCSI(self.region.height - self.start.. ';1', 'H'))
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self.sink:writeln(string.format('Page %d', self.curPage))
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end
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function Greenhouse:scroll(direction)
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local lines = self.pages[self.curPage].lines
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local oldOffset = self.offset
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if direction == 'down' then
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self.offset = math.min(self.offset + 1, #lines)
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elseif direction == 'up' then
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self.offset = math.max(self.offset - 1, 1)
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end
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if self.offset ~= oldOffset then self:draw() end
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end
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function Greenhouse:update()
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local size = terminal.size()
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self.region = size
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self:draw()
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end
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function Greenhouse:next()
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local oldCurrent = self.curPage
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self.curPage = math.min(self.curPage + 1, #self.pages)
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if self.curPage ~= oldCurrent then
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self.offset = 1
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self:draw()
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end
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end
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function Greenhouse:previous()
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local oldCurrent = self.curPage
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self.curPage = math.max(self.curPage - 1, 1)
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if self.curPage ~= oldCurrent then
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self.offset = 1
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self:draw()
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end
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end
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return Greenhouse
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