mirror of
https://github.com/kepler155c/opus
synced 2024-11-15 13:14:49 +00:00
61 lines
1.5 KiB
Lua
61 lines
1.5 KiB
Lua
local class = require('class')
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local UI = require('ui')
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local Util = require('util')
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--[[-- ScrollingGrid --]]--
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UI.ScrollingGrid = class(UI.Grid)
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UI.ScrollingGrid.defaults = {
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UIElement = 'ScrollingGrid',
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scrollOffset = 0,
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marginRight = 1,
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}
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function UI.ScrollingGrid:postInit()
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self.scrollBar = UI.ScrollBar()
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end
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function UI.ScrollingGrid:drawRows()
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UI.Grid.drawRows(self)
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self.scrollBar:draw()
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end
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function UI.ScrollingGrid:getViewArea()
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local y = 1
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if not self.disableHeader then
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y = y + self.headerHeight
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end
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return {
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static = true, -- the container doesn't scroll
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y = y, -- scrollbar Y
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height = self.pageSize, -- viewable height
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totalHeight = Util.size(self.values), -- total height
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offsetY = self.scrollOffset, -- scroll offset
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}
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end
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function UI.ScrollingGrid:getStartRow()
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local ts = Util.size(self.values)
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if ts < self.pageSize then
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self.scrollOffset = 0
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end
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return self.scrollOffset + 1
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end
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function UI.ScrollingGrid:setIndex(index)
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if index < self.scrollOffset + 1 then
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self.scrollOffset = index - 1
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elseif index - self.scrollOffset > self.pageSize then
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self.scrollOffset = index - self.pageSize
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end
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if self.scrollOffset < 0 then
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self.scrollOffset = 0
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else
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local ts = Util.size(self.values)
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if self.pageSize + self.scrollOffset + 1 > ts then
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self.scrollOffset = math.max(0, ts - self.pageSize)
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end
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end
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UI.Grid.setIndex(self, index)
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end
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