lite-hearted/data/core/commandview.lua

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2019-12-28 11:16:32 +00:00
local core = require "core"
local common = require "core.common"
local style = require "core.style"
local Doc = require "core.doc"
local DocView = require "core.docview"
local View = require "core.view"
local SingleLineDoc = Doc:extend()
function SingleLineDoc:insert(line, col, text)
SingleLineDoc.super.insert(self, line, col, text:gsub("\n", ""))
end
local CommandView = DocView:extend()
local max_suggestions = 10
local noop = function() end
local default_state = {
submit = noop,
suggest = noop,
cancel = noop,
}
function CommandView:new()
CommandView.super.new(self, SingleLineDoc())
self.suggestion_idx = 1
self.suggestions = {}
self.suggestions_height = 0
self.last_change_id = 0
self.gutter_width = 0
self.gutter_text_brightness = 0
self.selection_offset = 0
self.state = default_state
self.font = "font"
self.size.y = 0
self.label = ""
end
function CommandView:get_name()
return View.get_name(self)
end
function CommandView:get_line_screen_position()
local x = CommandView.super.get_line_screen_position(self, 1)
local _, y = self:get_content_offset()
local lh = self:get_line_height()
return x, y + (self.size.y - lh) / 2
end
function CommandView:get_scrollable_size()
return 0
end
function CommandView:scroll_to_make_visible()
-- no-op function to disable this functionality
end
function CommandView:get_text()
return self.doc:get_text(1, 1, 1, math.huge)
end
function CommandView:set_text(text)
self.doc:remove(1, 1, math.huge, math.huge)
self.doc:text_input(text)
end
function CommandView:move_suggestion_idx(dir)
local n = self.suggestion_idx + dir
self.suggestion_idx = common.clamp(n, 1, #self.suggestions)
self:complete()
self.last_change_id = self.doc:get_change_id()
end
function CommandView:complete()
if #self.suggestions > 0 then
self:set_text(self.suggestions[self.suggestion_idx].text)
end
end
function CommandView:submit()
local suggestion = self.suggestions[self.suggestion_idx]
local text = self:get_text()
local submit = self.state.submit
self:exit(true)
submit(text, suggestion)
end
function CommandView:enter(text, submit, suggest, cancel)
if self.state ~= default_state then
return
end
self.state = {
submit = submit or noop,
suggest = suggest or noop,
cancel = cancel or noop,
view = core.active_view
}
core.active_view = self
self:update_suggestions()
self.gutter_text_brightness = 100
self.label = text .. ": "
end
function CommandView:exit(submitted, inexplicit)
if core.active_view == self then
core.active_view = self.state.view
end
local cancel = self.state.cancel
self.state = default_state
self.doc:reset()
self.suggestions = {}
if not submitted then cancel(not inexplicit) end
end
function CommandView:get_gutter_width()
return self.gutter_width
end
function CommandView:get_suggestion_line_height()
return self:get_font():get_height() + style.padding.y
end
function CommandView:update_suggestions()
local t = self.state.suggest(self:get_text()) or {}
local res = {}
for i, item in ipairs(t) do
if i == max_suggestions then
break
end
if type(item) == "string" then
item = { text = item }
end
res[i] = item
end
self.suggestions = res
self.suggestion_idx = 1
end
function CommandView:update()
CommandView.super.update(self)
if core.active_view ~= self and self.state ~= default_state then
self:exit(false, true)
end
-- update suggestions if text has changed
if self.last_change_id ~= self.doc:get_change_id() then
self:update_suggestions()
self.last_change_id = self.doc:get_change_id()
end
-- update gutter text color brightness
self:move_towards("gutter_text_brightness", 0, 0.1)
-- update gutter width
local dest = self:get_font():get_width(self.label) + style.padding.x
if self.size.y <= 0 then
self.gutter_width = dest
else
self:move_towards("gutter_width", dest)
end
-- update suggestions box height
local lh = self:get_suggestion_line_height()
local dest = #self.suggestions * lh
self:move_towards("suggestions_height", dest)
-- update suggestion cursor offset
local dest = self.suggestion_idx * self:get_suggestion_line_height()
self:move_towards("selection_offset", dest)
-- update size based on whether this is the active_view
local dest = 0
if self == core.active_view then
dest = style.font:get_height() + style.padding.y * 2
end
self:move_towards(self.size, "y", dest)
end
function CommandView:draw_line_highlight()
-- no-op function to disable this functionality
end
function CommandView:draw_line_gutter(idx, x, y)
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local yoffset = self:get_line_text_y_offset()
local pos = self.position
local color = common.lerp(style.text, style.accent, self.gutter_text_brightness / 100)
core.push_clip_rect(pos.x, pos.y, self:get_gutter_width(), self.size.y)
renderer.draw_text(self:get_font(), self.label, x, y + yoffset, color)
core.pop_clip_rect()
end
local function draw_suggestions_box(self)
local lh = self:get_suggestion_line_height()
local dh = style.divider_size
local offsety = self:get_line_text_y_offset()
local x, _ = self:get_line_screen_position()
local h = math.ceil(self.suggestions_height)
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local rx, ry, rw, rh = self.position.x, self.position.y - h - dh, self.size.x, h
-- draw suggestions background
if #self.suggestions > 0 then
renderer.draw_rect(rx, ry, rw, rh, style.background3)
renderer.draw_rect(rx, ry - dh, rw, dh, style.divider)
local y = self.position.y - self.selection_offset - dh
renderer.draw_rect(rx, y, rw, lh, style.line_highlight)
end
-- draw suggestion text
core.push_clip_rect(rx, ry, rw, rh)
for i, item in ipairs(self.suggestions) do
local color = (i == self.suggestion_idx) and style.accent or style.text
local y = self.position.y - i * lh - dh
common.draw_text(self:get_font(), color, item.text, nil, x, y, 0, lh)
if item.info then
local w = self.size.x - x - style.padding.x
common.draw_text(self:get_font(), style.dim, item.info, "right", x, y, w, lh)
end
end
core.pop_clip_rect()
end
function CommandView:draw()
CommandView.super.draw(self)
core.root_view:defer_draw(draw_suggestions_box, self)
end
return CommandView