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Add DataList scroll progress

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Insality 2021-04-05 21:57:30 +03:00
parent 077a84d7b1
commit b3e7f63e64
1 changed files with 17 additions and 1 deletions
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18
druid/extended/data_list.lua
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@ -17,10 +17,14 @@
--- The current visual last data index
-- @tfield number last_index
--- The current progress of scroll posititon (approx.)
-- @tfield number scroll_progress
local const = require("druid.const")
local helper = require("druid.helper")
local component = require("druid.component")
local Event = require("druid.event")
local DataList = component.create("data_list")
@ -39,6 +43,7 @@ function DataList.init(self, scroll, grid, create_function)
--- Current visual elements indexes
self.top_index = 1
self.last_index = 1
self.scroll_progress = 0
self._create_function = create_function
self._data = {}
@ -48,6 +53,8 @@ function DataList.init(self, scroll, grid, create_function)
self._data_visual = {}
self.scroll.on_scroll:subscribe(self._check_elements, self)
self.on_scroll_progress_change = Event()
end
@ -234,13 +241,22 @@ function DataList._check_elements(self)
end
end
self:_check_elements_from(self.top_index, -1)
self:_check_elements_from(self.top_index + 1, 1)
self:_check_elements_from(self.top_index, -1)
for index, data in pairs(self._data_visual) do
self.top_index = math.min(self.top_index or index, index)
self.last_index = math.max(self.last_index or index, index)
end
local middle_index = (self.last_index + self.top_index) / 2
local progress = (middle_index - self._data_first_index) / (self._data_last_index - self._data_first_index)
progress = helper.clamp(progress, 0, 1)
if self.scroll_progress ~= progress then
self.scroll_progress = progress
self.on_scroll_progress_change:trigger(self:get_context(), progress)
end
end