mirror of https://github.com/kepler155c/opus
101 lines
2.5 KiB
Lua
101 lines
2.5 KiB
Lua
local class = require('opus.class')
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local UI = require('opus.ui')
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local colors = _G.colors
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--[[-- Viewport --]]--
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UI.Viewport = class(UI.Window)
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UI.Viewport.defaults = {
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UIElement = 'Viewport',
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backgroundColor = colors.cyan,
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accelerators = {
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down = 'scroll_down',
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up = 'scroll_up',
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home = 'scroll_top',
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[ 'end' ] = 'scroll_bottom',
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pageUp = 'scroll_pageUp',
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[ 'control-b' ] = 'scroll_pageUp',
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pageDown = 'scroll_pageDown',
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[ 'control-f' ] = 'scroll_pageDown',
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},
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}
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function UI.Viewport:layout()
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UI.Window.layout(self)
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if not self.canvas then
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self.canvas = self:addLayer()
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else
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self.canvas:resize(self.width, self.height)
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end
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end
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function UI.Viewport:enable()
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UI.Window.enable(self)
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self.canvas:setVisible(true)
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end
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function UI.Viewport:disable()
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UI.Window.disable(self)
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self.canvas:setVisible(false)
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end
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function UI.Viewport:setScrollPosition(offset)
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local oldOffset = self.offy
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self.offy = math.max(offset, 0)
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self.offy = math.min(self.offy, math.max(#self.canvas.lines, self.height) - self.height)
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if self.offy ~= oldOffset then
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if self.scrollBar then
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self.scrollBar:draw()
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end
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self.canvas.offy = offset
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self.canvas:dirty()
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end
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end
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function UI.Viewport:write(x, y, text, bg, tc)
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if y > #self.canvas.lines then
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for i = #self.canvas.lines, y do
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self.canvas.lines[i + 1] = { }
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self.canvas:clearLine(i + 1, self.backgroundColor, self.textColor)
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end
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end
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return UI.Window.write(self, x, y, text, bg, tc)
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end
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function UI.Viewport:reset()
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self.offy = 0
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self.canvas.offy = 0
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for i = self.height + 1, #self.canvas.lines do
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self.canvas.lines[i] = nil
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end
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end
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function UI.Viewport:getViewArea()
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return {
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y = (self.offy or 0) + 1,
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height = self.height,
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totalHeight = #self.canvas.lines,
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offsetY = self.offy or 0,
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}
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end
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function UI.Viewport:eventHandler(event)
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if event.type == 'scroll_down' then
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self:setScrollPosition(self.offy + 1)
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elseif event.type == 'scroll_up' then
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self:setScrollPosition(self.offy - 1)
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elseif event.type == 'scroll_top' then
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self:setScrollPosition(0)
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elseif event.type == 'scroll_bottom' then
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self:setScrollPosition(10000000)
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elseif event.type == 'scroll_pageUp' then
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self:setScrollPosition(self.offy - self.height)
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elseif event.type == 'scroll_pageDown' then
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self:setScrollPosition(self.offy + self.height)
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elseif event.type == 'scroll_to' then
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self:setScrollPosition(event.offset)
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else
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return false
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end
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return true
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end
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