mirror of
https://github.com/kepler155c/opus
synced 2024-11-18 14:44:50 +00:00
75 lines
2.0 KiB
Lua
75 lines
2.0 KiB
Lua
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local class = require('class')
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local UI = require('ui')
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local Util = require('util')
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local colors = _G.colors
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UI.ScrollBar = class(UI.Window)
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UI.ScrollBar.defaults = {
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UIElement = 'ScrollBar',
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lineChar = '|',
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sliderChar = '#',
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upArrowChar = '^',
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downArrowChar = 'v',
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scrollbarColor = colors.lightGray,
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width = 1,
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x = -1,
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ey = -1,
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}
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function UI.ScrollBar:draw()
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local view = self.parent:getViewArea()
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if view.totalHeight > view.height then
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local maxScroll = view.totalHeight - view.height
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local percent = view.offsetY / maxScroll
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local sliderSize = math.max(1, Util.round(view.height / view.totalHeight * (view.height - 2)))
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local x = self.width
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local row = view.y
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if not view.static then -- does the container scroll ?
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self.height = view.totalHeight
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end
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for i = 1, view.height - 2 do
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self:write(x, row + i, self.lineChar, nil, self.scrollbarColor)
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end
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local y = Util.round((view.height - 2 - sliderSize) * percent)
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for i = 1, sliderSize do
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self:write(x, row + y + i, self.sliderChar, nil, self.scrollbarColor)
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end
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local color = self.scrollbarColor
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if view.offsetY > 0 then
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color = colors.white
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end
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self:write(x, row, self.upArrowChar, nil, color)
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color = self.scrollbarColor
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if view.offsetY + view.height < view.totalHeight then
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color = colors.white
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end
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self:write(x, row + view.height - 1, self.downArrowChar, nil, color)
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end
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end
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function UI.ScrollBar:eventHandler(event)
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if event.type == 'mouse_click' or event.type == 'mouse_doubleclick' then
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if event.x == 1 then
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local view = self.parent:getViewArea()
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if view.totalHeight > view.height then
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if event.y == view.y then
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self:emit({ type = 'scroll_up'})
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elseif event.y == view.y + view.height - 1 then
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self:emit({ type = 'scroll_down'})
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else
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local percent = (event.y - view.y) / (view.height - 2)
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local y = math.floor((view.totalHeight - view.height) * percent)
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self:emit({ type = 'scroll_to', offset = y })
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end
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end
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return true
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end
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end
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end
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