mirror of https://github.com/kepler155c/opus
85 lines
2.1 KiB
Lua
85 lines
2.1 KiB
Lua
local class = require('opus.class')
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local UI = require('opus.ui')
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local Util = require('opus.util')
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local colors = _G.colors
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UI.Slider = class(UI.Window)
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UI.Slider.defaults = {
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UIElement = 'Slider',
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height = 1,
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barChar = UI.extChars and '\140' or '-',
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barColor = colors.gray,
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sliderChar = UI.extChars and '\143' or '\124',
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sliderColor = colors.blue,
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sliderFocusColor = colors.lightBlue,
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leftBorder = UI.extChars and '\141' or '\124',
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rightBorder = UI.extChars and '\142' or '\124',
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value = 0,
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min = 0,
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max = 100,
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event = 'slider_update',
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accelerators = {
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right = 'slide_right',
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left = 'slide_left',
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}
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}
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function UI.Slider:setValue(value)
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self.value = tonumber(value) or self.min
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end
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function UI.Slider:reset() -- form support
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self.value = self.min
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self:draw()
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end
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function UI.Slider:focus()
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self:draw()
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end
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function UI.Slider:draw()
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local range = self.max - self.min
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local perc = (self.value - self.min) / range
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local progress = Util.clamp(1 + self.width * perc, 1, self.width)
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local bar = { }
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for i = 1, self.width do
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local filler =
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i == 1 and self.leftBorder or
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i == self.width and self.rightBorder or
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self.barChar
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table.insert(bar, filler)
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end
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self:write(1, 1, table.concat(bar), nil, self.barColor)
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self:write(progress, 1, self.sliderChar, nil, self.focused and self.sliderFocusColor or self.sliderColor)
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end
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function UI.Slider:eventHandler(event)
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if event.type == "mouse_down" or event.type == "mouse_drag" then
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local range = self.max - self.min
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local i = (event.x - 1) / (self.width - 1)
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self.value = self.min + (i * range)
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self:emit({ type = self.event, value = self.value, element = self })
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self:draw()
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elseif event.type == 'slide_left' or event.type == 'slide_right' then
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local range = self.max - self.min
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local step = range / self.width
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if event.type == 'slide_left' then
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self.value = Util.clamp(self.value - step, self.min, self.max)
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else
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self.value = Util.clamp(self.value + step, self.min, self.max)
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end
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self:emit({ type = self.event, value = self.value, element = self })
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self:draw()
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end
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end
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function UI.Slider.example()
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return UI.Slider {
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y = 2, x = 2, ex = -2,
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min = 0, max = 1,
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}
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end
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