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-- mod-version:3
local core = require "core"
local config = require "core.config"
local common = require "core.common"
local style = require "core.style"
local DocView = require "core.docview"
config.plugins.motiontrail = common.merge({
enabled = true,
steps = 50,
-- The config specification used by the settings gui
config_spec = {
name = "Motion Trail",
{
label = "Enabled",
description = "Disable or enable the caret motion trail effect.",
path = "enabled",
type = "toggle",
default = true
},
{
label = "Steps",
description = "Amount of trail steps to generate on caret movement.",
path = "steps",
type = "number",
default = 50,
min = 10,
max = 100
},
}
}, config.plugins.motiontrail)
local cc_installed = pcall(require, 'plugins.custom_caret')
local cc_conf = config.plugins.custom_caret
local function get_caret_size(dv, i)
local line, col = dv.doc:get_selection_idx(i)
local chw = dv:get_font():get_width(dv.doc:get_char(line, col))
local w = style.caret_width
local h = dv:get_line_height()
if cc_installed then
local cc_shape = cc_conf.shape
if cc_shape == "underline" or dv.doc.overwrite then
w = chw
h = style.caret_width * 2
elseif cc_shape == "block" then
w = chw
end
end
return w, h
end
local caret_idx, caret_amt = 1, 0
local dv_update = DocView.update
function DocView:update()
self.last_pos = self.last_pos or {}
self.last_view = self.last_view or {}
self.last_doc_pos = self.last_doc_pos or {}
caret_idx = caret_idx or 1
-- continue from whatever caret_idx left
caret_amt = caret_amt and math.max(caret_amt, caret_idx) or 0
for i=1, caret_amt - caret_idx do
local ri = caret_idx + i
self.last_pos[ri] = nil
self.last_view[ri] = nil
self.last_doc_pos[ri] = nil
end
caret_idx = 1
dv_update(self)
end
local dv_draw = DocView.draw
function DocView:draw()
self.draws = self.draws and self.draws + 1 or 1
return dv_draw(self)
end
local dv_draw_caret = DocView.draw_caret
function DocView:draw_caret(x, y)
if not config.plugins.motiontrail.enabled or self ~= core.active_view then
dv_draw_caret(self, x, y)
return
end
self.last_pos[caret_idx] = self.last_pos[caret_idx] or {}
self.last_doc_pos[caret_idx] = self.last_doc_pos[caret_idx] or {}
local line, col = self.doc:get_selection_idx(caret_idx)
if self.draws <= 1 then
local lsx, lsy = self.last_pos[caret_idx][1] or x, self.last_pos[caret_idx][2] or y
local lsl, lsc = self.last_doc_pos[caret_idx][1], self.last_doc_pos[caret_idx][2]
local w, h = get_caret_size(self, caret_idx)
if self.difference_in_coords and lsx == x and lsy == y then
self.difference_in_coords = false
end
if lsl ~= line or lsc ~= col then self.difference_in_coords = true end
if self.difference_in_coords and self.last_view[caret_idx] == self then
local lx = x
for i = 0, 1, 1 / config.plugins.motiontrail.steps do
local ix = common.lerp(x, lsx, i)
local iy = common.lerp(y, lsy, i)
if cc_installed and cc_conf.shape == "underline" or self.doc.overwrite then
iy = iy + self:get_line_height()
end
local iw = math.max(w, math.ceil(math.abs(ix - lx)))
local color = style.caret
if cc_installed and cc_conf.custom_color then
color = cc_conf.caret_color
end
renderer.draw_rect(ix, iy, iw, h, color)
lx = ix
end
core.redraw = true
end
end
self.last_pos[caret_idx][1], self.last_pos[caret_idx][2], self.last_view[caret_idx] = x, y, self
self.last_doc_pos[caret_idx][1], self.last_doc_pos[caret_idx][2] = line, col
caret_idx = caret_idx + 1
self.draws = 0
dv_draw_caret(self, x, y)
end
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