mirror of
https://github.com/kepler155c/opus
synced 2024-11-15 13:14:49 +00:00
75 lines
2.0 KiB
Lua
75 lines
2.0 KiB
Lua
local class = require('class')
|
|
local UI = require('ui')
|
|
local Util = require('util')
|
|
|
|
local colors = _G.colors
|
|
|
|
UI.ScrollBar = class(UI.Window)
|
|
UI.ScrollBar.defaults = {
|
|
UIElement = 'ScrollBar',
|
|
lineChar = '|',
|
|
sliderChar = '#',
|
|
upArrowChar = '^',
|
|
downArrowChar = 'v',
|
|
scrollbarColor = colors.lightGray,
|
|
width = 1,
|
|
x = -1,
|
|
ey = -1,
|
|
}
|
|
function UI.ScrollBar:draw()
|
|
local view = self.parent:getViewArea()
|
|
|
|
if view.totalHeight > view.height then
|
|
local maxScroll = view.totalHeight - view.height
|
|
local percent = view.offsetY / maxScroll
|
|
local sliderSize = math.max(1, Util.round(view.height / view.totalHeight * (view.height - 2)))
|
|
local x = self.width
|
|
|
|
local row = view.y
|
|
if not view.static then -- does the container scroll ?
|
|
self.height = view.totalHeight
|
|
end
|
|
|
|
for i = 1, view.height - 2 do
|
|
self:write(x, row + i, self.lineChar, nil, self.scrollbarColor)
|
|
end
|
|
|
|
local y = Util.round((view.height - 2 - sliderSize) * percent)
|
|
for i = 1, sliderSize do
|
|
self:write(x, row + y + i, self.sliderChar, nil, self.scrollbarColor)
|
|
end
|
|
|
|
local color = self.scrollbarColor
|
|
if view.offsetY > 0 then
|
|
color = colors.white
|
|
end
|
|
self:write(x, row, self.upArrowChar, nil, color)
|
|
|
|
color = self.scrollbarColor
|
|
if view.offsetY + view.height < view.totalHeight then
|
|
color = colors.white
|
|
end
|
|
self:write(x, row + view.height - 1, self.downArrowChar, nil, color)
|
|
end
|
|
end
|
|
|
|
function UI.ScrollBar:eventHandler(event)
|
|
if event.type == 'mouse_click' or event.type == 'mouse_doubleclick' then
|
|
if event.x == 1 then
|
|
local view = self.parent:getViewArea()
|
|
if view.totalHeight > view.height then
|
|
if event.y == view.y then
|
|
self:emit({ type = 'scroll_up'})
|
|
elseif event.y == view.y + view.height - 1 then
|
|
self:emit({ type = 'scroll_down'})
|
|
else
|
|
local percent = (event.y - view.y) / (view.height - 2)
|
|
local y = math.floor((view.totalHeight - view.height) * percent)
|
|
self:emit({ type = 'scroll_to', offset = y })
|
|
end
|
|
end
|
|
return true
|
|
end
|
|
end
|
|
end
|