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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author ruki
-- @file choicebox.lua
--
-- load modules
local log = require("ui/log")
local view = require("ui/view")
local rect = require("ui/rect")
local panel = require("ui/panel")
local event = require("ui/event")
local action = require("ui/action")
local curses = require("ui/curses")
local button = require("ui/button")
local object = require("ui/object")
-- define module
local choicebox = choicebox or panel()
-- init choicebox
function choicebox:init(name, bounds)
-- init panel
panel.init(self, name, bounds)
-- init items
self._ITEMS = {}
-- init start index
self._STARTINDEX = 1
end
-- load values
function choicebox:load(values, selected)
-- clear the views first
self:clear()
-- reset start index
self._STARTINDEX = 1
-- load items
local items = {}
for idx, value in ipairs(values) do
table.insert(items, self:_load_item(value, idx, idx == selected))
end
self._ITEMS = items
-- insert top-n items
local startindex = self._STARTINDEX
for idx = startindex, startindex + self:height() - 1 do
local item = items[idx]
if item then
self:insert(item)
else
break
end
end
-- select the first item
self:select(self:first())
-- on loaded
self:action_on(action.ac_on_load)
-- invalidate
self:invalidate()
end
-- is scrollable?
function choicebox:scrollable()
return #self:_items() > self:height()
end
-- scroll
function choicebox:scroll(count)
if self:scrollable() then
local items = self:_items()
local totalcount = #items
local startindex = self._STARTINDEX + count
if startindex > totalcount then
return
elseif startindex < 1 then
startindex = 1
end
self._STARTINDEX = startindex
self:clear()
for idx = startindex, startindex + self:height() - 1 do
local item = items[idx]
if item then
item:bounds():move2(0, idx - startindex)
self:insert(item)
else
break
end
end
if count > 0 then
self:select(self:first())
else
self:select(self:last())
end
self:invalidate()
end
end
-- on resize
function choicebox:on_resize()
local items = self:_items()
local totalcount = #items
local startindex = self._STARTINDEX
for idx = 1, totalcount do
local item = items[idx]
if item then
if idx >= startindex and idx < startindex + self:height() then
if not self:view(item:name()) then
item:bounds():move2(0, idx - startindex)
self:insert(item)
end
else
if self:view(item:name()) then
self:remove(item)
end
end
end
end
panel.on_resize(self)
end
-- on event
function choicebox:on_event(e)
if e.type == event.ev_keyboard then
if e.key_name == "Down" then
if self:current() == self:last() then
self:scroll(self:height())
else
self:select_next()
end
self:_notify_scrolled()
return true
elseif e.key_name == "Up" then
if self:current() == self:first() then
self:scroll(-self:height())
else
self:select_prev()
end
self:_notify_scrolled()
return true
elseif e.key_name == "PageDown" or e.key_name == "PageUp" then
local direction = e.key_name == "PageDown" and 1 or -1
self:scroll(self:height() * direction)
self:_notify_scrolled()
return true
elseif e.key_name == "Enter" or e.key_name == " " then
self:_do_select()
return true
end
elseif e.type == event.ev_command and e.command == "cm_enter" then
self:_do_select()
return true
end
end
-- load a item with value
function choicebox:_load_item(value, index, selected)
-- init text
local text = (selected and "(X) " or "( ) ") .. tostring(value)
-- init a value item view
local item = button:new("choicebox.value." .. index,
rect:new(0, index - 1, self:width(), 1),
text,
function (v, e)
self:_do_select()
end)
-- attach index and value
item:extra_set("index", index)
item:extra_set("value", value)
return item
end
-- notify scrolled
function choicebox:_notify_scrolled()
local totalcount = #self:_items()
local startindex = self:current():extra("index")
self:action_on(action.ac_on_scrolled, startindex / totalcount)
end
-- get all items
function choicebox:_items()
return self._ITEMS
end
-- do select the current config
function choicebox:_do_select()
-- clear selected text
for v in self:views() do
local text = v:text()
if text and text:startswith("(X) ") then
local t = v:extra("value")
v:text_set("( ) " .. tostring(t))
end
end
-- get the current item
local item = self:current()
-- do action: on selected
local index = item:extra("index")
local value = item:extra("value")
self:action_on(action.ac_on_selected, index, value)
-- update text
item:text_set("(X) " .. tostring(value))
end
-- return module
return choicebox
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