mirror of https://github.com/kepler155c/opus
113 lines
2.9 KiB
Lua
113 lines
2.9 KiB
Lua
local class = require('opus.class')
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local UI = require('opus.ui')
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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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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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left = 'scroll_left',
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right = 'scroll_right',
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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:postInit()
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if self.showScrollBar then
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self.scrollBar = UI.ScrollBar()
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end
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end
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function UI.Viewport:setScrollPosition(offy, offx) -- argh - reverse
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local oldOffy = self.offy
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self.offy = math.max(offy, 0)
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self.offy = math.min(self.offy, math.max(#self.lines, self.height) - self.height)
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if self.offy ~= oldOffy 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.offy = offy
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self:dirty(true)
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end
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local oldOffx = self.offx
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self.offx = math.max(offx or 0, 0)
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self.offx = math.min(self.offx, math.max(#self.lines[1], self.width) - self.width)
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if self.offx ~= oldOffx 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.offx = offx or 0
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self:dirty(true)
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end
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end
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function UI.Viewport:blit(x, y, text, bg, fg)
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if y > #self.lines then
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self:resizeBuffer(self.width, y)
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end
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return UI.Window.blit(self, x, y, text, bg, fg)
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end
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function UI.Viewport:write(x, y, text, bg, fg)
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if y > #self.lines then
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self:resizeBuffer(self.width, y)
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end
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return UI.Window.write(self, x, y, text, bg, fg)
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end
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function UI.Viewport:setViewHeight(h)
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if h > #self.lines then
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self:resizeBuffer(self.width, h)
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end
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end
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function UI.Viewport:reset()
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self.offy = 0
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for i = self.height + 1, #self.lines do
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self.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.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 #self.lines <= self.height then
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return
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end
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if event.type == 'scroll_down' then
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self:setScrollPosition(self.offy + 1, self.offx)
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elseif event.type == 'scroll_up' then
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self:setScrollPosition(self.offy - 1, self.offx)
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elseif event.type == 'scroll_left' then
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self:setScrollPosition(self.offy, self.offx - 1)
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elseif event.type == 'scroll_right' then
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self:setScrollPosition(self.offy, self.offx + 1)
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elseif event.type == 'scroll_top' then
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self:setScrollPosition(0, 0)
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elseif event.type == 'scroll_bottom' then
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self:setScrollPosition(10000000, 0)
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elseif event.type == 'scroll_pageUp' then
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self:setScrollPosition(self.offy - self.height, self.offx)
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elseif event.type == 'scroll_pageDown' then
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self:setScrollPosition(self.offy + self.height, self.offx)
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elseif event.type == 'scroll_to' then
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self:setScrollPosition(event.offset, 0)
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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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