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local core = require "core"
local common = require "core.common"
local command = require "core.command"
local config = require "core.config"
local keymap = require "core.keymap"
local style = require "core.style"
local Object = require "core.object"
local border_width = 1
local divider_width = 1
local DIVIDER = {}
local ContextMenu = Object:extend()
ContextMenu.DIVIDER = DIVIDER
function ContextMenu:new()
self.itemset = {}
self.show_context_menu = false
self.selected = -1
self.height = 0
self.position = { x = 0, y = 0 }
end
local function get_item_size(item)
local lw, lh
if item == DIVIDER then
lw = 0
lh = divider_width
else
lw = style.font:get_width(item.text)
if item.info then
lw = lw + style.padding.x + style.font:get_width(item.info)
end
lh = style.font:get_height() + style.padding.y
end
return lw, lh
end
function ContextMenu:register(predicate, items)
if type(predicate) == "string" then
predicate = require(predicate)
end
if type(predicate) == "table" then
local class = predicate
predicate = function() return core.active_view:is(class) end
end
local width, height = 0, 0 --precalculate the size of context menu
for i, item in ipairs(items) do
if item ~= DIVIDER then
item.info = keymap.reverse_map[item.command]
end
local lw, lh = get_item_size(item)
width = math.max(width, lw)
height = height + lh
end
width = width + style.padding.x * 2
items.width, items.height = width, height
table.insert(self.itemset, { predicate = predicate, items = items })
end
function ContextMenu:show(x, y)
self.items = nil
local items_list = { width = 0, height = 0 }
for _, items in ipairs(self.itemset) do
if items.predicate(x, y) then
items_list.width = math.max(items_list.width, items.items.width)
items_list.height = items_list.height + items.items.height
for _, subitems in ipairs(items.items) do
table.insert(items_list, subitems)
end
end
end
if #items_list > 0 then
self.items = items_list
local w, h = self.items.width, self.items.height
-- by default the box is opened on the right and below
if x + w >= core.root_view.size.x then
x = x - w
end
if y + h >= core.root_view.size.y then
y = y - h
end
self.position.x, self.position.y = x, y
self.show_context_menu = true
return true
end
return false
end
function ContextMenu:hide()
self.show_context_menu = false
self.items = nil
self.selected = -1
self.height = 0
end
function ContextMenu:each_item()
local x, y, w = self.position.x, self.position.y, self.items.width
local oy = y
return coroutine.wrap(function()
for i, item in ipairs(self.items) do
local _, lh = get_item_size(item)
if y - oy > self.height then break end
coroutine.yield(i, item, x, y, w, lh)
y = y + lh
end
end)
end
function ContextMenu:on_mouse_moved(px, py)
if not self.show_context_menu then return end
self.selected = -1
for i, item, x, y, w, h in self:each_item() do
if px > x and px <= x + w and py > y and py <= y + h then
self.selected = i
break
end
end
if self.selected >= 0 then
core.request_cursor("arrow")
end
return true
end
function ContextMenu:on_selected(item)
if type(item.command) == "string" then
command.perform(item.command)
else
item.command()
end
end
function ContextMenu:on_mouse_pressed(button, x, y, clicks)
local selected = (self.items or {})[self.selected]
local caught = false
self:hide()
if button == "left" then
if selected then
self:on_selected(selected)
caught = true
end
end
if button == "right" then
caught = self:show(x, y)
end
return caught
end
-- copied from core.docview
function ContextMenu:move_towards(t, k, dest, rate)
if type(t) ~= "table" then
return self:move_towards(self, t, k, dest, rate)
end
local val = t[k]
if not config.transitions or math.abs(val - dest) < 0.5 then
t[k] = dest
else
rate = rate or 0.5
if config.fps ~= 60 or config.animation_rate ~= 1 then
local dt = 60 / config.fps
rate = 1 - common.clamp(1 - rate, 1e-8, 1 - 1e-8)^(config.animation_rate * dt)
end
t[k] = common.lerp(val, dest, rate)
end
if val ~= dest then
core.redraw = true
end
end
function ContextMenu:update()
if self.show_context_menu then
self:move_towards("height", self.items.height)
end
end
function ContextMenu:draw()
if not self.show_context_menu then return end
core.root_view:defer_draw(self.draw_context_menu, self)
end
function ContextMenu:draw_context_menu()
if not self.items then return end
local bx, by, bw, bh = self.position.x, self.position.y, self.items.width, self.height
renderer.draw_rect(
bx - border_width,
by - border_width,
bw + (border_width * 2),
bh + (border_width * 2),
style.divider
)
renderer.draw_rect(bx, by, bw, bh, style.background3)
for i, item, x, y, w, h in self:each_item() do
if item == DIVIDER then
renderer.draw_rect(x, y, w, h, style.caret)
else
if i == self.selected then
renderer.draw_rect(x, y, w, h, style.selection)
end
common.draw_text(style.font, style.text, item.text, "left", x + style.padding.x, y, w, h)
if item.info then
common.draw_text(style.font, style.dim, item.info, "right", x, y, w - style.padding.x, h)
end
end
end
end
return ContextMenu
|
