lite-xl/data/core/rootview.lua

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local core = require "core"
local common = require "core.common"
local config = require "core.config"
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local style = require "core.style"
local keymap = require "core.keymap"
local Object = require "core.object"
local View = require "core.view"
local CommandView = require "core.commandview"
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local NagView = require "core.nagview"
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local DocView = require "core.docview"
local EmptyView = View:extend()
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local function draw_text(x, y, color)
local th = style.big_font:get_height()
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local dh = 2 * th + style.padding.y * 2
local x1, y1 = x, y + (dh - th) / 2
x = renderer.draw_text(style.big_font, "Lite XL", x1, y1, color)
renderer.draw_text(style.font, "version " .. VERSION, x1, y1 + th, color)
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x = x + style.padding.x
renderer.draw_rect(x, y, math.ceil(1 * SCALE), dh, color)
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local lines = {
{ fmt = "%s to run a command", cmd = "core:find-command" },
{ fmt = "%s to open a file from the project", cmd = "core:find-file" },
{ fmt = "%s to change project folder", cmd = "core:change-project-folder" },
{ fmt = "%s to open a project folder", cmd = "core:open-project-folder" },
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}
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th = style.font:get_height()
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y = y + (dh - (th + style.padding.y) * #lines) / 2
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local w = 0
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for _, line in ipairs(lines) do
local text = string.format(line.fmt, keymap.get_binding(line.cmd))
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w = math.max(w, renderer.draw_text(style.font, text, x + style.padding.x, y, color))
y = y + th + style.padding.y
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end
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return w, dh
end
function EmptyView:draw()
self:draw_background(style.background)
local w, h = draw_text(0, 0, { 0, 0, 0, 0 })
local x = self.position.x + math.max(style.padding.x, (self.size.x - w) / 2)
local y = self.position.y + (self.size.y - h) / 2
draw_text(x, y, style.dim)
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end
local Node = Object:extend()
function Node:new(type)
self.type = type or "leaf"
self.position = { x = 0, y = 0 }
self.size = { x = 0, y = 0 }
self.views = {}
self.divider = 0.5
if self.type == "leaf" then
self:add_view(EmptyView())
end
self.hovered = {x = -1, y = -1 }
self.hovered_close = 0
self.tab_shift = 0
self.tab_offset = 1
self.tab_width = style.tab_width
self.move_towards = View.move_towards
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end
function Node:propagate(fn, ...)
self.a[fn](self.a, ...)
self.b[fn](self.b, ...)
end
function Node:on_mouse_moved(x, y, ...)
if self.type == "leaf" then
self.hovered.x, self.hovered.y = x, y
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self.active_view:on_mouse_moved(x, y, ...)
else
self:propagate("on_mouse_moved", x, y, ...)
end
end
function Node:on_mouse_released(...)
if self.type == "leaf" then
self.active_view:on_mouse_released(...)
else
self:propagate("on_mouse_released", ...)
end
end
function Node:consume(node)
for k, _ in pairs(self) do self[k] = nil end
for k, v in pairs(node) do self[k] = v end
end
local type_map = { up="vsplit", down="vsplit", left="hsplit", right="hsplit" }
-- The "locked" argument below should be in the form {x = <boolean>, y = <boolean>}
-- and it indicates if the node want to have a fixed size along the axis where the
-- boolean is true. If not it will be expanded to take all the available space.
-- The "resizable" flag indicates if, along the "locked" axis the node can be resized
-- by the user. If the node is marked as resizable their view should provide a
-- set_target_size method.
function Node:split(dir, view, locked, resizable)
assert(self.type == "leaf", "Tried to split non-leaf node")
local node_type = assert(type_map[dir], "Invalid direction")
local last_active = core.active_view
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local child = Node()
child:consume(self)
self:consume(Node(node_type))
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self.a = child
self.b = Node()
if view then self.b:add_view(view) end
if locked then
assert(type(locked) == 'table')
self.b.locked = locked
self.b.resizable = resizable or false
core.set_active_view(last_active)
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end
if dir == "up" or dir == "left" then
self.a, self.b = self.b, self.a
return self.a
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end
return self.b
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end
function Node:close_view(root, view)
local new_active_view = view == self.active_view
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local do_close = function()
if #self.views > 1 then
local idx = self:get_view_idx(view)
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table.remove(self.views, idx)
if new_active_view then
self:set_active_view(self.views[idx] or self.views[#self.views])
end
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else
local parent = self:get_parent_node(root)
local is_a = (parent.a == self)
local other = parent[is_a and "b" or "a"]
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if other:get_locked_size() then
self.views = {}
self:add_view(EmptyView())
else
parent:consume(other)
local p = parent
while p.type ~= "leaf" do
p = p[is_a and "a" or "b"]
end
p:set_active_view(p.active_view)
if self.is_primary_node then
p.is_primary_node = true
end
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end
end
core.last_active_view = nil
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end
view:try_close(do_close)
end
function Node:close_active_view(root)
self:close_view(root, self.active_view)
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end
function Node:add_view(view)
assert(self.type == "leaf", "Tried to add view to non-leaf node")
assert(not self.locked, "Tried to add view to locked node")
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if self.views[1] and self.views[1]:is(EmptyView) then
table.remove(self.views)
end
table.insert(self.views, view)
self:set_active_view(view)
end
function Node:set_active_view(view)
assert(self.type == "leaf", "Tried to set active view on non-leaf node")
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self.active_view = view
core.set_active_view(view)
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end
function Node:get_view_idx(view)
for i, v in ipairs(self.views) do
if v == view then return i end
end
end
function Node:get_node_for_view(view)
for _, v in ipairs(self.views) do
if v == view then return self end
end
if self.type ~= "leaf" then
return self.a:get_node_for_view(view) or self.b:get_node_for_view(view)
end
end
function Node:get_parent_node(root)
if root.a == self or root.b == self then
return root
elseif root.type ~= "leaf" then
return self:get_parent_node(root.a) or self:get_parent_node(root.b)
end
end
function Node:get_children(t)
t = t or {}
for _, view in ipairs(self.views) do
table.insert(t, view)
end
if self.a then self.a:get_children(t) end
if self.b then self.b:get_children(t) end
return t
end
-- return the width including the padding space and separately
-- the padding space itself
local function get_scroll_button_width()
local w = style.icon_font:get_width(">")
local pad = w
return w + 2 * pad, pad
end
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function Node:get_divider_overlapping_point(px, py)
if self.type ~= "leaf" then
local p = 6
local x, y, w, h = self:get_divider_rect()
x, y = x - p, y - p
w, h = w + p * 2, h + p * 2
if px > x and py > y and px < x + w and py < y + h then
return self
end
return self.a:get_divider_overlapping_point(px, py)
or self.b:get_divider_overlapping_point(px, py)
end
end
function Node:get_visible_tabs_number()
return math.min(#self.views - self.tab_offset + 1, config.max_tabs)
end
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function Node:get_tab_overlapping_point(px, py)
if #self.views == 1 then return nil end
local tabs_number = self:get_visible_tabs_number()
local x1, y1, w, h = self:get_tab_rect(self.tab_offset)
local x2, y2 = self:get_tab_rect(self.tab_offset + tabs_number)
if px >= x1 and py >= y1 and px < x2 and py < y1 + h then
return math.floor((px - x1) / w) + self.tab_offset
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end
end
local function close_button_location(x, w)
local cw = style.icon_font:get_width("C")
local pad = style.padding.y
return x + w - pad - cw, cw, pad
end
function Node:get_scroll_button_index(px, py)
if #self.views == 1 then return end
for i = 1, 2 do
local x, y, w, h = self:get_scroll_button_rect(i)
if px >= x and px < x + w and py >= y and py < y + h then
return i
end
end
end
function Node:tab_hovered_update(px, py)
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local tab_index = self:get_tab_overlapping_point(px, py)
self.hovered_tab = tab_index
self.hovered_close = 0
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self.hovered_scroll_button = 0
if tab_index then
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local x, y, w, h = self:get_tab_rect(tab_index)
local cx, cw = close_button_location(x, w)
if px >= cx and px < cx + cw and py >= y and py < y + h then
self.hovered_close = tab_index
end
else
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self.hovered_scroll_button = self:get_scroll_button_index(px, py) or 0
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end
end
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function Node:get_child_overlapping_point(x, y)
local child
if self.type == "leaf" then
return self
elseif self.type == "hsplit" then
child = (x < self.b.position.x) and self.a or self.b
elseif self.type == "vsplit" then
child = (y < self.b.position.y) and self.a or self.b
end
return child:get_child_overlapping_point(x, y)
end
function Node:get_scroll_button_rect(index)
local w, pad = get_scroll_button_width()
local h = style.font:get_height() + style.padding.y * 2
local x = self.position.x + (index == 1 and 0 or self.size.x - w)
return x, self.position.y, w, h, pad
end
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function Node:get_tab_rect(idx)
local sbw = get_scroll_button_width()
local maxw = self.size.x - 2 * sbw
local x0 = self.position.x + sbw
local x1 = x0 + common.clamp(self.tab_width * (idx - 1) - self.tab_shift, 0, maxw)
local x2 = x0 + common.clamp(self.tab_width * idx - self.tab_shift, 0, maxw)
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local h = style.font:get_height() + style.padding.y * 2
return x1, self.position.y, x2 - x1, h
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end
function Node:get_divider_rect()
local x, y = self.position.x, self.position.y
if self.type == "hsplit" then
return x + self.a.size.x, y, style.divider_size, self.size.y
elseif self.type == "vsplit" then
return x, y + self.a.size.y, self.size.x, style.divider_size
end
end
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-- Return two values for x and y axis and each of them is either falsy or a number.
-- A falsy value indicate no fixed size along the corresponding direction.
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function Node:get_locked_size()
if self.type == "leaf" then
if self.locked then
local size = self.active_view.size
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-- The values below should be either a falsy value or a number
local sx = (self.locked and self.locked.x) and size.x
local sy = (self.locked and self.locked.y) and size.y
return sx, sy
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end
else
local x1, y1 = self.a:get_locked_size()
local x2, y2 = self.b:get_locked_size()
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-- The values below should be either a falsy value or a number
local sx, sy
if self.type == 'hsplit' then
if x1 and x2 then
local dsx = (x1 < 1 or x2 < 1) and 0 or style.divider_size
sx = x1 + x2 + dsx
end
sy = y1 or y2
else
if y1 and y2 then
local dsy = (y1 < 1 or y2 < 1) and 0 or style.divider_size
sy = y1 + y2 + dsy
end
sx = x1 or x2
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end
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return sx, sy
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end
end
local function copy_position_and_size(dst, src)
dst.position.x, dst.position.y = src.position.x, src.position.y
dst.size.x, dst.size.y = src.size.x, src.size.y
end
-- calculating the sizes is the same for hsplits and vsplits, except the x/y
-- axis are swapped; this function lets us use the same code for both
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local function calc_split_sizes(self, x, y, x1, x2, y1, y2)
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local n
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local ds = ((x1 and x1 < 1) or (x2 and x2 < 1)) and 0 or style.divider_size
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if x1 then
n = x1 + ds
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elseif x2 then
n = self.size[x] - x2
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else
n = math.floor(self.size[x] * self.divider)
end
self.a.position[x] = self.position[x]
self.a.position[y] = self.position[y]
self.a.size[x] = n - ds
self.a.size[y] = self.size[y]
self.b.position[x] = self.position[x] + n
self.b.position[y] = self.position[y]
self.b.size[x] = self.size[x] - n
self.b.size[y] = self.size[y]
end
function Node:update_layout()
if self.type == "leaf" then
local av = self.active_view
if #self.views > 1 then
local _, _, _, th = self:get_tab_rect(1)
av.position.x, av.position.y = self.position.x, self.position.y + th
av.size.x, av.size.y = self.size.x, self.size.y - th
else
copy_position_and_size(av, self)
end
else
local x1, y1 = self.a:get_locked_size()
local x2, y2 = self.b:get_locked_size()
if self.type == "hsplit" then
calc_split_sizes(self, "x", "y", x1, x2)
elseif self.type == "vsplit" then
calc_split_sizes(self, "y", "x", y1, y2)
end
self.a:update_layout()
self.b:update_layout()
end
end
function Node:scroll_tabs_to_visible()
local index = self:get_view_idx(self.active_view)
if index then
local tabs_number = self:get_visible_tabs_number()
if self.tab_offset > index then
self.tab_offset = index
elseif self.tab_offset + tabs_number - 1 < index then
self.tab_offset = index - tabs_number + 1
elseif tabs_number < config.max_tabs and self.tab_offset > 1 then
self.tab_offset = #self.views - config.max_tabs + 1
end
end
end
function Node:scroll_tabs(dir)
local view_index = self:get_view_idx(self.active_view)
if dir == 1 then
if self.tab_offset > 1 then
self.tab_offset = self.tab_offset - 1
local last_index = self.tab_offset + self:get_visible_tabs_number() - 1
if view_index > last_index then
self:set_active_view(self.views[last_index])
end
end
elseif dir == 2 then
local tabs_number = self:get_visible_tabs_number()
if self.tab_offset + tabs_number - 1 < #self.views then
self.tab_offset = self.tab_offset + 1
local view_index = self:get_view_idx(self.active_view)
if view_index < self.tab_offset then
self:set_active_view(self.views[self.tab_offset])
end
end
end
end
function Node:target_tab_width()
local n = self:get_visible_tabs_number()
local w = self.size.x - get_scroll_button_width() * 2
return common.clamp(style.tab_width, w / config.max_tabs, w / n)
end
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function Node:update()
if self.type == "leaf" then
self:scroll_tabs_to_visible()
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for _, view in ipairs(self.views) do
view:update()
end
self:tab_hovered_update(self.hovered.x, self.hovered.y)
local tab_width = self:target_tab_width()
self:move_towards("tab_shift", tab_width * (self.tab_offset - 1))
self:move_towards("tab_width", tab_width)
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else
self.a:update()
self.b:update()
end
end
function Node:draw_tabs()
local x, y, w, h, scroll_padding = self:get_scroll_button_rect(1)
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local ds = style.divider_size
local dots_width = style.font:get_width("")
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core.push_clip_rect(x, y, self.size.x, h)
renderer.draw_rect(x, y, self.size.x, h, style.background2)
renderer.draw_rect(x, y + h - ds, self.size.x, ds, style.divider)
if self.tab_offset > 1 then
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local button_style = self.hovered_scroll_button == 1 and style.text or style.dim
common.draw_text(style.icon_font, button_style, "<", nil, x + scroll_padding, y, 0, h)
end
local tabs_number = self:get_visible_tabs_number()
if #self.views > self.tab_offset + tabs_number - 1 then
local xrb, yrb, wrb = self:get_scroll_button_rect(2)
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local button_style = self.hovered_scroll_button == 2 and style.text or style.dim
common.draw_text(style.icon_font, button_style, ">", nil, xrb + scroll_padding, yrb, 0, h)
end
for i = self.tab_offset, self.tab_offset + tabs_number - 1 do
local view = self.views[i]
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local x, y, w, h = self:get_tab_rect(i)
local text = view:get_name()
local color = style.dim
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local padding_y = style.padding.y
renderer.draw_rect(x + w, y + padding_y, ds, h - padding_y * 2, style.dim)
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if view == self.active_view then
color = style.text
renderer.draw_rect(x, y, w, h, style.background)
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renderer.draw_rect(x + w, y, ds, h, style.divider)
renderer.draw_rect(x - ds, y, ds, h, style.divider)
end
local cx, cw, cspace = close_button_location(x, w)
local show_close_button = (view == self.active_view or i == self.hovered_tab)
if show_close_button then
local close_style = self.hovered_close == i and style.text or style.dim
common.draw_text(style.icon_font, close_style, "C", nil, cx, y, 0, h)
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end
if i == self.hovered_tab then
color = style.text
end
local padx = style.padding.x
-- Normally we should substract "cspace" from text_avail_width and from the
-- clipping width. It is the padding space we give to the left and right of the
-- close button. However, since we are using dots to terminate filenames, we
-- choose to ignore "cspace" accepting that the text can possibly "touch" the
-- close button.
local text_avail_width = cx - x - padx
core.push_clip_rect(x, y, cx - x, h)
x, w = x + padx, w - padx * 2
local align = "center"
if style.font:get_width(text) > text_avail_width then
align = "left"
for i = 1, #text do
local reduced_text = text:sub(1, #text - i)
if style.font:get_width(reduced_text) + dots_width <= text_avail_width then
text = reduced_text .. ""
break
end
end
end
common.draw_text(style.font, color, text, align, x, y, w, h)
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core.pop_clip_rect()
end
core.pop_clip_rect()
end
function Node:draw()
if self.type == "leaf" then
if #self.views > 1 then
self:draw_tabs()
end
local pos, size = self.active_view.position, self.active_view.size
core.push_clip_rect(pos.x, pos.y, size.x + pos.x % 1, size.y + pos.y % 1)
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self.active_view:draw()
core.pop_clip_rect()
else
local x, y, w, h = self:get_divider_rect()
renderer.draw_rect(x, y, w, h, style.divider)
self:propagate("draw")
end
end
function Node:is_empty()
if self.type == "leaf" then
return #self.views == 0
else
return self.a:is_empty() and self.b:is_empty()
end
end
function Node:close_all_docviews()
if self.type == "leaf" then
local i = 1
while i <= #self.views do
local view = self.views[i]
if view:is(DocView) and not view:is(CommandView) then
table.remove(self.views, i)
else
i = i + 1
end
end
if #self.views == 0 and self.is_primary_node then
self:add_view(EmptyView())
end
else
self.a:close_all_docviews()
self.b:close_all_docviews()
if self.a:is_empty() then
self:consume(self.b)
elseif self.b:is_empty() then
self:consume(self.a)
end
end
end
-- Returns true for nodes that accept either "proportional" resizes (based on the
-- node.divider) or "locked" resizable nodes (along the resize axis).
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function Node:is_resizable(axis)
if self.type == 'leaf' then
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return not self.locked or not self.locked[axis] or self.resizable
else
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local a_resizable = self.a:is_resizable(axis)
local b_resizable = self.b:is_resizable(axis)
return a_resizable and b_resizable
end
end
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-- Return true iff it is a locked pane along the rezise axis and is
-- declared "resizable".
function Node:is_locked_resizable(axis)
return self.locked and self.locked[axis] and self.resizable
end
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function Node:resize(axis, value)
if self.type == 'leaf' then
-- If it is not locked we don't accept the
-- resize operation here because for proportional panes the resize is
-- done using the "divider" value of the parent node.
if self:is_locked_resizable(axis) then
return self.active_view:set_target_size(axis, value)
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end
else
if self.type == (axis == "x" and "hsplit" or "vsplit") then
-- we are resizing a node that is splitted along the resize axis
if self.a:is_locked_resizable(axis) and self.b:is_locked_resizable(axis) then
local rem_value = value - self.a.size[axis]
if rem_value >= 0 then
return self.b.active_view:set_target_size(axis, rem_value)
else
self.b.active_view:set_target_size(axis, 0)
return self.a.active_view:set_target_size(axis, value)
end
end
else
-- we are resizing a node that is splitted along the axis perpendicular
-- to the resize axis
local a_resizable = self.a:is_resizable(axis)
local b_resizable = self.b:is_resizable(axis)
if a_resizable and b_resizable then
self.a:resize(axis, value)
self.b:resize(axis, value)
end
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end
end
end
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local RootView = View:extend()
function RootView:new()
RootView.super.new(self)
self.root_node = Node()
self.deferred_draws = {}
self.mouse = { x = 0, y = 0 }
end
function RootView:defer_draw(fn, ...)
table.insert(self.deferred_draws, 1, { fn = fn, ... })
end
function RootView:get_active_node()
return self.root_node:get_node_for_view(core.active_view)
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end
local function get_primary_node(node)
if node.is_primary_node then
return node
end
if node.type ~= "leaf" then
return get_primary_node(node.a) or get_primary_node(node.b)
end
end
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function RootView:get_active_node_default()
local node = self.root_node:get_node_for_view(core.active_view)
if node.locked then
local default_view = self:get_primary_node().views[1]
assert(default_view, "internal error: cannot find original document node.")
core.set_active_view(default_view)
node = self:get_active_node()
end
return node
end
function RootView:get_primary_node()
return get_primary_node(self.root_node)
end
function RootView:open_doc(doc)
local node = self:get_active_node_default()
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for i, view in ipairs(node.views) do
if view.doc == doc then
node:set_active_view(node.views[i])
return view
end
end
local view = DocView(doc)
node:add_view(view)
self.root_node:update_layout()
view:scroll_to_line(view.doc:get_selection(), true, true)
return view
end
function RootView:close_all_docviews()
self.root_node:close_all_docviews()
end
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function RootView:on_mouse_pressed(button, x, y, clicks)
local div = self.root_node:get_divider_overlapping_point(x, y)
if div then
self.dragged_divider = div
return
end
local node = self.root_node:get_child_overlapping_point(x, y)
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if node.hovered_scroll_button > 0 then
node:scroll_tabs(node.hovered_scroll_button)
return
end
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local idx = node:get_tab_overlapping_point(x, y)
if idx then
if button == "middle" or node.hovered_close == idx then
node:close_view(self.root_node, node.views[idx])
else
self.dragged_node = idx
node:set_active_view(node.views[idx])
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end
else
core.set_active_view(node.active_view)
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node.active_view:on_mouse_pressed(button, x, y, clicks)
end
end
function RootView:on_mouse_released(...)
if self.dragged_divider then
self.dragged_divider = nil
end
if self.dragged_node then
self.dragged_node = nil
end
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self.root_node:on_mouse_released(...)
end
local function resize_child_node(node, axis, value, delta)
local accept_resize = node.a:resize(axis, value)
if not accept_resize then
accept_resize = node.b:resize(axis, node.size[axis] - value)
end
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if not accept_resize then
node.divider = node.divider + delta / node.size[axis]
end
end
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function RootView:on_mouse_moved(x, y, dx, dy)
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if core.active_view == core.nag_view then
core.request_cursor("arrow")
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core.active_view:on_mouse_moved(x, y, dx, dy)
return
end
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if self.dragged_divider then
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local node = self.dragged_divider
if node.type == "hsplit" then
x = common.clamp(x, 0, self.root_node.size.x * 0.95)
resize_child_node(node, "x", x, dx)
elseif node.type == "vsplit" then
y = common.clamp(y, 0, self.root_node.size.y * 0.95)
resize_child_node(node, "y", y, dy)
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end
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node.divider = common.clamp(node.divider, 0.01, 0.99)
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return
end
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self.mouse.x, self.mouse.y = x, y
self.root_node:on_mouse_moved(x, y, dx, dy)
local node = self.root_node:get_child_overlapping_point(x, y)
local div = self.root_node:get_divider_overlapping_point(x, y)
local tab_index = node and node:get_tab_overlapping_point(x, y)
if node and node:get_scroll_button_index(x, y) then
core.request_cursor("arrow")
elseif div then
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local axis = (div.type == "hsplit" and "x" or "y")
if div.a:is_resizable(axis) and div.b:is_resizable(axis) then
core.request_cursor(div.type == "hsplit" and "sizeh" or "sizev")
end
elseif tab_index then
core.request_cursor("arrow")
if self.dragged_node and self.dragged_node ~= tab_index then
local tab = node.views[self.dragged_node]
table.remove(node.views, self.dragged_node)
table.insert(node.views, tab_index, tab)
self.dragged_node = tab_index
end
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else
core.request_cursor(node.active_view.cursor)
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end
end
function RootView:on_mouse_wheel(...)
local x, y = self.mouse.x, self.mouse.y
local node = self.root_node:get_child_overlapping_point(x, y)
node.active_view:on_mouse_wheel(...)
end
function RootView:on_text_input(...)
core.active_view:on_text_input(...)
end
function RootView:on_focus_lost(...)
-- We force a redraw so documents can redraw without the cursor.
core.redraw = true
end
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function RootView:update()
copy_position_and_size(self.root_node, self)
self.root_node:update()
self.root_node:update_layout()
end
function RootView:draw()
self.root_node:draw()
while #self.deferred_draws > 0 do
local t = table.remove(self.deferred_draws)
t.fn(table.unpack(t))
end
if core.cursor_change_req then
system.set_cursor(core.cursor_change_req)
core.cursor_change_req = nil
end
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end
return RootView