lite-xl/data/core/view.lua

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local core = require "core"
local config = require "core.config"
local common = require "core.common"
local Object = require "core.object"
local Scrollbar = require "core.scrollbar"
---@class core.view.position
---@field x number
---@field y number
---@class core.view.scroll
---@field x number
---@field y number
---@field to core.view.position
---@class core.view.thumbtrack
---@field thumb number
---@field track number
---@class core.view.thumbtrackwidth
---@field thumb number
---@field track number
---@field to core.view.thumbtrack
---@class core.view.scrollbar
---@field x core.view.thumbtrack
---@field y core.view.thumbtrack
---@field w core.view.thumbtrackwidth
---@field h core.view.thumbtrack
---@alias core.view.cursor "'arrow'" | "'ibeam'" | "'sizeh'" | "'sizev'" | "'hand'"
---@alias core.view.mousebutton "'left'" | "'right'"
---@alias core.view.context "'application'" | "'session'"
---Base view.
---@class core.view : core.object
---@field context core.view.context
---@field super core.object
---@field position core.view.position
---@field size core.view.position
---@field scroll core.view.scroll
---@field cursor core.view.cursor
---@field scrollable boolean
---@field v_scrollbar core.scrollbar
---@field h_scrollbar core.scrollbar
---@field current_scale number
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local View = Object:extend()
-- context can be "application" or "session". The instance of objects
-- with context "session" will be closed when a project session is
-- terminated. The context "application" is for functional UI elements.
View.context = "application"
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function View:new()
self.position = { x = 0, y = 0 }
self.size = { x = 0, y = 0 }
self.scroll = { x = 0, y = 0, to = { x = 0, y = 0 } }
self.cursor = "arrow"
self.scrollable = false
self.v_scrollbar = Scrollbar({direction = "v", alignment = "e"})
self.h_scrollbar = Scrollbar({direction = "h", alignment = "e"})
self.current_scale = SCALE
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end
function View:move_towards(t, k, dest, rate, name)
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if type(t) ~= "table" then
return self:move_towards(self, t, k, dest, rate, name)
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end
local val = t[k]
local diff = math.abs(val - dest)
if not config.transitions or diff < 0.5 or config.disabled_transitions[name] then
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t[k] = dest
else
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rate = rate or 0.5
if config.fps ~= 60 or config.animation_rate ~= 1 then
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local dt = 60 / config.fps
rate = 1 - common.clamp(1 - rate, 1e-8, 1 - 1e-8)^(config.animation_rate * dt)
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end
t[k] = common.lerp(val, dest, rate)
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end
if diff > 1e-8 then
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core.redraw = true
end
end
function View:try_close(do_close)
do_close()
end
---@return string
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function View:get_name()
return "---"
end
---@return number
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function View:get_scrollable_size()
return math.huge
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end
---@return number
function View:get_h_scrollable_size()
return 0
end
function View:supports_text_input()
return false
end
---@param x number
---@param y number
---@return boolean
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function View:scrollbar_overlaps_point(x, y)
return not (not (self.v_scrollbar:overlaps(x, y) or self.h_scrollbar:overlaps(x, y)))
end
---@return boolean
function View:scrollbar_dragging()
return self.v_scrollbar.dragging or self.h_scrollbar.dragging
end
---@return boolean
function View:scrollbar_hovering()
return self.v_scrollbar.hovering.track or self.h_scrollbar.hovering.track
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end
---@param button core.view.mousebutton
---@param x number
---@param y number
---@param clicks integer
---return boolean
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function View:on_mouse_pressed(button, x, y, clicks)
if not self.scrollable then return end
local result = self.v_scrollbar:on_mouse_pressed(button, x, y, clicks)
if result then
if result ~= true then
self.scroll.to.y = result * self:get_scrollable_size()
end
return true
end
result = self.h_scrollbar:on_mouse_pressed(button, x, y, clicks)
if result then
if result ~= true then
self.scroll.to.x = result * self:get_h_scrollable_size()
end
return true
end
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end
---@param button core.view.mousebutton
---@param x number
---@param y number
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function View:on_mouse_released(button, x, y)
if not self.scrollable then return end
self.v_scrollbar:on_mouse_released(button, x, y)
self.h_scrollbar:on_mouse_released(button, x, y)
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end
---@param x number
---@param y number
---@param dx number
---@param dy number
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function View:on_mouse_moved(x, y, dx, dy)
if not self.scrollable then return end
local result
if self.h_scrollbar.dragging then goto skip_v_scrollbar end
result = self.v_scrollbar:on_mouse_moved(x, y, dx, dy)
if result then
if result ~= true then
self.scroll.to.y = result * self:get_scrollable_size()
if not config.animate_drag_scroll then
self:clamp_scroll_position()
self.scroll.y = self.scroll.to.y
end
end
-- hide horizontal scrollbar
self.h_scrollbar:on_mouse_left()
return true
end
::skip_v_scrollbar::
result = self.h_scrollbar:on_mouse_moved(x, y, dx, dy)
if result then
if result ~= true then
self.scroll.to.x = result * self:get_h_scrollable_size()
if not config.animate_drag_scroll then
self:clamp_scroll_position()
self.scroll.x = self.scroll.to.x
end
end
return true
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end
end
function View:on_mouse_left()
if not self.scrollable then return end
self.v_scrollbar:on_mouse_left()
self.h_scrollbar:on_mouse_left()
end
---@param filename string
---@param x number
---@param y number
---@return boolean
function View:on_file_dropped(filename, x, y)
return false
end
---@param text string
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function View:on_text_input(text)
-- no-op
end
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function View:on_ime_text_editing(text, start, length)
-- no-op
end
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---@param y number @Vertical scroll delta; positive is "up"
---@param x number @Horizontal scroll delta; positive is "left"
---@return boolean @Capture event
function View:on_mouse_wheel(y, x)
-- no-op
end
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---Can be overriden to listen for scale change events to apply
---any neccesary changes in sizes, padding, etc...
---@param new_scale number
---@param prev_scale number
function View:on_scale_change(new_scale, prev_scale) end
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function View:get_content_bounds()
local x = self.scroll.x
local y = self.scroll.y
return x, y, x + self.size.x, y + self.size.y
end
---@return number x
---@return number y
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function View:get_content_offset()
local x = common.round(self.position.x - self.scroll.x)
local y = common.round(self.position.y - self.scroll.y)
return x, y
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end
function View:clamp_scroll_position()
local max = self:get_scrollable_size() - self.size.y
self.scroll.to.y = common.clamp(self.scroll.to.y, 0, max)
max = self:get_h_scrollable_size() - self.size.x
self.scroll.to.x = common.clamp(self.scroll.to.x, 0, max)
end
function View:update_scrollbar()
local v_scrollable = self:get_scrollable_size()
self.v_scrollbar:set_size(self.position.x, self.position.y, self.size.x, self.size.y, v_scrollable)
self.v_scrollbar:set_percent(self.scroll.y/v_scrollable)
self.v_scrollbar:update()
local h_scrollable = self:get_h_scrollable_size()
self.h_scrollbar:set_size(self.position.x, self.position.y, self.size.x, self.size.y, h_scrollable)
self.h_scrollbar:set_percent(self.scroll.x/h_scrollable)
self.h_scrollbar:update()
end
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function View:update()
if self.current_scale ~= SCALE then
self:on_scale_change(SCALE, self.current_scale)
self.current_scale = SCALE
end
self:clamp_scroll_position()
self:move_towards(self.scroll, "x", self.scroll.to.x, 0.3, "scroll")
self:move_towards(self.scroll, "y", self.scroll.to.y, 0.3, "scroll")
if not self.scrollable then return end
self:update_scrollbar()
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end
---@param color renderer.color
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function View:draw_background(color)
local x, y = self.position.x, self.position.y
local w, h = self.size.x, self.size.y
renderer.draw_rect(x, y, w, h, color)
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end
function View:draw_scrollbar()
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self.v_scrollbar:draw()
self.h_scrollbar:draw()
end
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function View:draw()
end
return View