awesome/lib/wibox/layout/stack.lua

147 lines
4.2 KiB
Lua

---------------------------------------------------------------------------
-- A stacked layout.
--
-- This layout display widgets on top of each other. It can be used to overlay
-- a `wibox.widget.textbox` on top of a `awful.widget.progressbar` or manage
-- "pages" where only one is visible at any given moment.
--
-- The indices are going from 1 (the bottom of the stack) up to the top of
-- the stack. The order can be changed either using `:swap` or `:raise`.
--
--@DOC_wibox_layout_defaults_stack_EXAMPLE@
-- @author Emmanuel Lepage Vallee
-- @copyright 2016 Emmanuel Lepage Vallee
-- @release @AWESOME_VERSION@
-- @classmod wibox.layout.stack
---------------------------------------------------------------------------
local base = require("wibox.widget.base" )
local fixed = require("wibox.layout.fixed")
local table = table
local pairs = pairs
local util = require("awful.util")
local stack = {mt={}}
--@DOC_fixed_COMMON@
--- Add some widgets to the given stack layout
-- @param layout The layout you are modifying.
-- @tparam widget ... Widgets that should be added (must at least be one)
-- @name add
-- @class function
--- Remove a widget from the layout
-- @tparam index The widget index to remove
-- @treturn boolean index If the operation is successful
-- @name remove
-- @class function
--- Insert a new widget in the layout at position `index`
-- @tparam number index The position
-- @param widget The widget
-- @treturn boolean If the operation is successful
-- @name insert
-- @class function
--- Remove one or more widgets from the layout
-- The last parameter can be a boolean, forcing a recursive seach of the
-- widget(s) to remove.
-- @param widget ... Widgets that should be removed (must at least be one)
-- @treturn boolean If the operation is successful
-- @name remove_widgets
-- @class function
--- Add spacing between each layout widgets
-- @property spacing
-- @tparam number spacing Spacing between widgets.
function stack:layout(_, width, height)
local result = {}
local spacing = self._private.spacing
for _, v in pairs(self._private.widgets) do
table.insert(result, base.place_widget_at(v, spacing, spacing, width - 2*spacing, height - 2*spacing))
if self._private.top_only then break end
end
return result
end
function stack:fit(context, orig_width, orig_height)
local max_w, max_h = 0,0
local spacing = self._private.spacing
for _, v in pairs(self._private.widgets) do
local w, h = base.fit_widget(self, context, v, orig_width, orig_height)
max_w, max_h = math.max(max_w, w+2*spacing), math.max(max_h, h+2*spacing)
end
return math.min(max_w, orig_width), math.min(max_h, orig_height)
end
--- If only the first stack widget is drawn
-- @property top_only
function stack:get_top_only()
return self._private.top_only
end
function stack:set_top_only(top_only)
self._private.top_only = top_only
end
--- Raise a widget at `index` to the top of the stack
-- @tparam number index the widget index to raise
function stack:raise(index)
if (not index) or self._private.widgets[index] then return end
local w = self._private.widgets[index]
table.remove(self._private.widgets, index)
table.insert(self._private.widgets, w)
self:emit_signal("widget::layout_changed")
end
--- Raise the first instance of `widget`
-- @param widget The widget to raise
-- @tparam[opt=false] boolean recursive Also look deeper in the hierarchy to
-- find the widget
function stack:raise_widget(widget, recursive)
local idx, layout = self:index(widget, recursive)
if not idx or not layout then return end
-- Bubble up in the stack until the right index is found
while layout and layout ~= self do
idx, layout = self:index(layout, recursive)
end
if layout == self and idx ~= 1 then
self:raise(idx)
end
end
--- Create a new stack layout.
-- @function wibox.layout.stack
-- @treturn widget A new stack layout
local function new(...)
local ret = fixed.horizontal(...)
util.table.crush(ret, stack, true)
return ret
end
function stack.mt:__call(_, ...)
return new(...)
end
--@DOC_widget_COMMON@
--@DOC_object_COMMON@
return setmetatable(stack, stack.mt)
-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80