136 lines
3.8 KiB
Lua
136 lines
3.8 KiB
Lua
---------------------------------------------------------------------------
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--
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-- A container that makes a widget display only on a specified screen.
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--
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-- @author Uli Schlachter
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-- @copyright 2017 Uli Schlachter
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-- @containermod awful.widget.only_on_screen
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-- @supermodule wibox.widget.base
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---------------------------------------------------------------------------
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local type = type
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local pairs = pairs
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local setmetatable = setmetatable
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local base = require("wibox.widget.base")
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local gtable = require("gears.table")
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local capi = {
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screen = screen,
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awesome = awesome
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}
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local only_on_screen = { mt = {} }
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local instances = setmetatable({}, { __mode = "k" })
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local function should_display_on(self, s)
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if not self._private.widget then
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return false
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end
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local own_s = self._private.screen
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if type(own_s) == "number" and (own_s < 1 or own_s > capi.screen.count()) then
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-- Invalid screen number
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return false
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end
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return capi.screen[self._private.screen] == s
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end
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-- Layout this layout
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function only_on_screen:layout(context, ...)
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if not should_display_on(self, context.screen) then return end
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return { base.place_widget_at(self._private.widget, 0, 0, ...) }
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end
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-- Fit this layout into the given area
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function only_on_screen:fit(context, ...)
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if not should_display_on(self, context.screen) then
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return 0, 0
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end
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return base.fit_widget(self, context, self._private.widget, ...)
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end
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--- The widget to be displayed
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-- @property widget
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-- @tparam widget widget The widget
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only_on_screen.set_widget = base.set_widget_common
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function only_on_screen:get_widget()
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return self._private.widget
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end
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function only_on_screen:get_children()
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return {self._private.widget}
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end
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function only_on_screen:set_children(children)
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self:set_widget(children[1])
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end
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--- The screen to display on. Can be a screen object, a screen index, a screen
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-- name ("VGA1") or the string "primary" for the primary screen.
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-- @property screen
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-- @tparam screen|string|integer screen The screen.
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function only_on_screen:set_screen(s)
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self._private.screen = s
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self:emit_signal("widget::layout_changed")
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end
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function only_on_screen:get_screen()
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return self._private.screen
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end
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--- Returns a new only_on_screen container.
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-- This widget makes some other widget visible on just some screens. Use
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-- `:set_widget()` to set the widget and `:set_screen()` to set the screen.
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-- @param[opt] widget The widget to display.
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-- @param[opt] s The screen to display on.
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-- @treturn table A new only_on_screen container
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-- @constructorfct awful.widget.only_on_screen
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local function new(widget, s)
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local ret = base.make_widget(nil, nil, {enable_properties = true})
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gtable.crush(ret, only_on_screen, true)
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ret:set_widget(widget)
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ret:set_screen(s or "primary")
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instances[ret] = true
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return ret
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end
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function only_on_screen.mt:__call(...)
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return new(...)
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end
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-- Handle lots of cases where a screen changes and thus this widget jumps around
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capi.screen.connect_signal("primary_changed", function()
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for widget in pairs(instances) do
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if widget._private.widget and widget._private.screen == "primary" then
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widget:emit_signal("widget::layout_changed")
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end
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end
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end)
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capi.screen.connect_signal("list", function()
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for widget in pairs(instances) do
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if widget._private.widget and type(widget._private.screen) == "number" then
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widget:emit_signal("widget::layout_changed")
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end
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end
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end)
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capi.screen.connect_signal("property::outputs", function()
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for widget in pairs(instances) do
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if widget._private.widget and type(widget._private.screen) == "string" then
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widget:emit_signal("widget::layout_changed")
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end
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end
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end)
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return setmetatable(only_on_screen, only_on_screen.mt)
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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