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exwm-systemtray.el
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;;; exwm-systemtray.el --- System Tray Module for -*- lexical-binding: t -*-
;;; EXWM
;; Copyright (C) 2016-2020 Free Software Foundation, Inc.
;; Author: Chris Feng <[email protected]>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This module adds system tray support for EXWM.
;; To use this module, load and enable it as follows:
;; (require 'exwm-systemtray)
;; (exwm-systemtray-enable)
;;; Code:
(require 'xcb-icccm)
(require 'xcb-xembed)
(require 'xcb-systemtray)
(require 'exwm-core)
(require 'exwm-workspace)
(defclass exwm-systemtray--icon ()
((width :initarg :width)
(height :initarg :height)
(visible :initarg :visible))
:documentation "Attributes of a system tray icon.")
(defclass xcb:systemtray:-ClientMessage
(xcb:icccm:--ClientMessage xcb:ClientMessage)
((format :initform 32)
(type :initform xcb:Atom:MANAGER)
(time :initarg :time :type xcb:TIMESTAMP) ;new slot
(selection :initarg :selection :type xcb:ATOM) ;new slot
(owner :initarg :owner :type xcb:WINDOW)) ;new slot
:documentation "A systemtray client message.")
(defgroup exwm-systemtray nil
"System tray."
:version "25.3"
:group 'exwm)
(defcustom exwm-systemtray-height nil
"System tray height.
You shall use the default value if using auto-hide minibuffer."
:type 'integer)
(defcustom exwm-systemtray-icon-gap 2
"Gap between icons."
:type 'integer)
(defvar exwm-systemtray--embedder-window nil "The embedder window.")
(defcustom exwm-systemtray-background-color nil
"Background color of systemtray.
This should be a color, or nil for transparent background."
:type '(choice (const :tag "Transparent" nil)
(color))
:initialize #'custom-initialize-default
:set (lambda (symbol value)
(set-default symbol value)
;; Change the background color for embedder.
(when (and exwm--connection
exwm-systemtray--embedder-window)
(let ((background-pixel (exwm--color->pixel value)))
(xcb:+request exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window exwm-systemtray--embedder-window
:value-mask (logior xcb:CW:BackPixmap
(if background-pixel
xcb:CW:BackPixel 0))
:background-pixmap
xcb:BackPixmap:ParentRelative
:background-pixel background-pixel))
;; Unmap & map to take effect immediately.
(xcb:+request exwm--connection
(make-instance 'xcb:UnmapWindow
:window exwm-systemtray--embedder-window))
(xcb:+request exwm--connection
(make-instance 'xcb:MapWindow
:window exwm-systemtray--embedder-window))
(xcb:flush exwm--connection)))))
;; GTK icons require at least 16 pixels to show normally.
(defconst exwm-systemtray--icon-min-size 16 "Minimum icon size.")
(defvar exwm-systemtray--connection nil "The X connection.")
(defvar exwm-systemtray--list nil "The icon list.")
(defvar exwm-systemtray--selection-owner-window nil
"The selection owner window.")
(defvar xcb:Atom:_NET_SYSTEM_TRAY_S0)
(defun exwm-systemtray--embed (icon)
"Embed an icon."
(exwm--log "Try to embed #x%x" icon)
(let ((info (xcb:+request-unchecked+reply exwm-systemtray--connection
(make-instance 'xcb:xembed:get-_XEMBED_INFO
:window icon)))
width* height* visible)
(when info
(exwm--log "Embed #x%x" icon)
(with-slots (width height)
(xcb:+request-unchecked+reply exwm-systemtray--connection
(make-instance 'xcb:GetGeometry :drawable icon))
(setq height* exwm-systemtray-height
width* (round (* width (/ (float height*) height))))
(when (< width* exwm-systemtray--icon-min-size)
(setq width* exwm-systemtray--icon-min-size
height* (round (* height (/ (float width*) width)))))
(exwm--log "Resize from %dx%d to %dx%d"
width height width* height*))
;; Add this icon to save-set.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ChangeSaveSet
:mode xcb:SetMode:Insert
:window icon))
;; Reparent to the embedder.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ReparentWindow
:window icon
:parent exwm-systemtray--embedder-window
:x 0
;; Vertically centered.
:y (/ (- exwm-systemtray-height height*) 2)))
;; Resize the icon.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ConfigureWindow
:window icon
:value-mask (logior xcb:ConfigWindow:Width
xcb:ConfigWindow:Height
xcb:ConfigWindow:BorderWidth)
:width width*
:height height*
:border-width 0))
;; Set event mask.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ChangeWindowAttributes
:window icon
:value-mask xcb:CW:EventMask
:event-mask (logior xcb:EventMask:ResizeRedirect
xcb:EventMask:KeyPress
xcb:EventMask:PropertyChange)))
;; Grab all keys and forward them to Emacs frame.
(unless (exwm-workspace--minibuffer-own-frame-p)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:GrabKey
:owner-events 0
:grab-window icon
:modifiers xcb:ModMask:Any
:key xcb:Grab:Any
:pointer-mode xcb:GrabMode:Async
:keyboard-mode xcb:GrabMode:Async)))
(setq visible (slot-value info 'flags))
(if visible
(setq visible
(/= 0 (logand (slot-value info 'flags) xcb:xembed:MAPPED)))
;; Default to visible.
(setq visible t))
(when visible
(exwm--log "Map the window")
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:MapWindow :window icon)))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:xembed:SendEvent
:destination icon
:event
(xcb:marshal
(make-instance 'xcb:xembed:EMBEDDED-NOTIFY
:window icon
:time xcb:Time:CurrentTime
:embedder
exwm-systemtray--embedder-window
:version 0)
exwm-systemtray--connection)))
(push `(,icon . ,(make-instance 'exwm-systemtray--icon
:width width*
:height height*
:visible visible))
exwm-systemtray--list)
(exwm-systemtray--refresh))))
(defun exwm-systemtray--unembed (icon)
"Unembed an icon."
(exwm--log "Unembed #x%x" icon)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:UnmapWindow :window icon))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ReparentWindow
:window icon
:parent exwm--root
:x 0 :y 0))
(setq exwm-systemtray--list
(assq-delete-all icon exwm-systemtray--list))
(exwm-systemtray--refresh))
(defun exwm-systemtray--refresh ()
"Refresh the system tray."
(exwm--log)
;; Make sure to redraw the embedder.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:UnmapWindow
:window exwm-systemtray--embedder-window))
(let ((x exwm-systemtray-icon-gap)
map)
(dolist (pair exwm-systemtray--list)
(when (slot-value (cdr pair) 'visible)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ConfigureWindow
:window (car pair)
:value-mask xcb:ConfigWindow:X
:x x))
(setq x (+ x (slot-value (cdr pair) 'width)
exwm-systemtray-icon-gap))
(setq map t)))
(let ((workarea (elt exwm-workspace--workareas
exwm-workspace-current-index)))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ConfigureWindow
:window exwm-systemtray--embedder-window
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Width)
:x (- (aref workarea 2) x)
:width x)))
(when map
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:MapWindow
:window exwm-systemtray--embedder-window))))
(xcb:flush exwm-systemtray--connection))
(defun exwm-systemtray--on-DestroyNotify (data _synthetic)
"Unembed icons on DestroyNotify."
(exwm--log)
(let ((obj (make-instance 'xcb:DestroyNotify)))
(xcb:unmarshal obj data)
(with-slots (window) obj
(when (assoc window exwm-systemtray--list)
(exwm-systemtray--unembed window)))))
(defun exwm-systemtray--on-ReparentNotify (data _synthetic)
"Unembed icons on ReparentNotify."
(exwm--log)
(let ((obj (make-instance 'xcb:ReparentNotify)))
(xcb:unmarshal obj data)
(with-slots (window parent) obj
(when (and (/= parent exwm-systemtray--embedder-window)
(assoc window exwm-systemtray--list))
(exwm-systemtray--unembed window)))))
(defun exwm-systemtray--on-ResizeRequest (data _synthetic)
"Resize the tray icon on ResizeRequest."
(exwm--log)
(let ((obj (make-instance 'xcb:ResizeRequest))
attr)
(xcb:unmarshal obj data)
(with-slots (window width height) obj
(when (setq attr (cdr (assoc window exwm-systemtray--list)))
(with-slots ((width* width)
(height* height))
attr
(setq height* exwm-systemtray-height
width* (round (* width (/ (float height*) height))))
(when (< width* exwm-systemtray--icon-min-size)
(setq width* exwm-systemtray--icon-min-size
height* (round (* height (/ (float width*) width)))))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ConfigureWindow
:window window
:value-mask (logior xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height)
;; Vertically centered.
:y (/ (- exwm-systemtray-height height*) 2)
:width width*
:height height*)))
(exwm-systemtray--refresh)))))
(defun exwm-systemtray--on-PropertyNotify (data _synthetic)
"Map/Unmap the tray icon on PropertyNotify."
(exwm--log)
(let ((obj (make-instance 'xcb:PropertyNotify))
attr info visible)
(xcb:unmarshal obj data)
(with-slots (window atom state) obj
(when (and (eq state xcb:Property:NewValue)
(eq atom xcb:Atom:_XEMBED_INFO)
(setq attr (cdr (assoc window exwm-systemtray--list))))
(setq info (xcb:+request-unchecked+reply exwm-systemtray--connection
(make-instance 'xcb:xembed:get-_XEMBED_INFO
:window window)))
(when info
(setq visible (/= 0 (logand (slot-value info 'flags)
xcb:xembed:MAPPED)))
(exwm--log "#x%x visible? %s" window visible)
(if visible
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:MapWindow :window window))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:UnmapWindow :window window)))
(setf (slot-value attr 'visible) visible)
(exwm-systemtray--refresh))))))
(defun exwm-systemtray--on-ClientMessage (data _synthetic)
"Handle client messages."
(let ((obj (make-instance 'xcb:ClientMessage))
opcode data32)
(xcb:unmarshal obj data)
(with-slots (window type data) obj
(when (eq type xcb:Atom:_NET_SYSTEM_TRAY_OPCODE)
(setq data32 (slot-value data 'data32)
opcode (elt data32 1))
(exwm--log "opcode: %s" opcode)
(cond ((= opcode xcb:systemtray:opcode:REQUEST-DOCK)
(unless (assoc (elt data32 2) exwm-systemtray--list)
(exwm-systemtray--embed (elt data32 2))))
;; Not implemented (rarely used nowadays).
((or (= opcode xcb:systemtray:opcode:BEGIN-MESSAGE)
(= opcode xcb:systemtray:opcode:CANCEL-MESSAGE)))
(t
(exwm--log "Unknown opcode message: %s" obj)))))))
(defun exwm-systemtray--on-KeyPress (data _synthetic)
"Forward all KeyPress events to Emacs frame."
(exwm--log)
;; This function is only executed when there's no autohide minibuffer,
;; a workspace frame has the input focus and the pointer is over a
;; tray icon.
(let ((dest (frame-parameter (selected-frame) 'exwm-outer-id))
(obj (make-instance 'xcb:KeyPress)))
(xcb:unmarshal obj data)
(setf (slot-value obj 'event) dest)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination dest
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal obj exwm-systemtray--connection))))
(xcb:flush exwm-systemtray--connection))
(defun exwm-systemtray--on-workspace-switch ()
"Reparent/Refresh the system tray in `exwm-workspace-switch-hook'."
(exwm--log)
(unless (exwm-workspace--minibuffer-own-frame-p)
(exwm-workspace--update-offsets)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ReparentWindow
:window exwm-systemtray--embedder-window
:parent (string-to-number
(frame-parameter exwm-workspace--current
'window-id))
:x 0
:y (- (elt (elt exwm-workspace--workareas
exwm-workspace-current-index)
3)
exwm-workspace--frame-y-offset
exwm-systemtray-height))))
(exwm-systemtray--refresh))
(defun exwm-systemtray--refresh-all ()
"Reposition/Refresh the system tray."
(exwm--log)
(unless (exwm-workspace--minibuffer-own-frame-p)
(exwm-workspace--update-offsets)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ConfigureWindow
:window exwm-systemtray--embedder-window
:value-mask xcb:ConfigWindow:Y
:y (- (elt (elt exwm-workspace--workareas
exwm-workspace-current-index)
3)
exwm-workspace--frame-y-offset
exwm-systemtray-height))))
(exwm-systemtray--refresh))
(cl-defun exwm-systemtray--init ()
"Initialize system tray module."
(exwm--log)
(cl-assert (not exwm-systemtray--connection))
(cl-assert (not exwm-systemtray--list))
(cl-assert (not exwm-systemtray--selection-owner-window))
(cl-assert (not exwm-systemtray--embedder-window))
(unless exwm-systemtray-height
(setq exwm-systemtray-height (max exwm-systemtray--icon-min-size
(line-pixel-height))))
;; Create a new connection.
(setq exwm-systemtray--connection (xcb:connect))
(set-process-query-on-exit-flag (slot-value exwm-systemtray--connection
'process)
nil)
;; Initialize XELB modules.
(xcb:xembed:init exwm-systemtray--connection t)
(xcb:systemtray:init exwm-systemtray--connection t)
;; Acquire the manager selection _NET_SYSTEM_TRAY_S0.
(with-slots (owner)
(xcb:+request-unchecked+reply exwm-systemtray--connection
(make-instance 'xcb:GetSelectionOwner
:selection xcb:Atom:_NET_SYSTEM_TRAY_S0))
(when (/= owner xcb:Window:None)
(xcb:disconnect exwm-systemtray--connection)
(setq exwm-systemtray--connection nil)
(warn "[EXWM] Other system tray detected")
(cl-return-from exwm-systemtray--init)))
(let ((id (xcb:generate-id exwm-systemtray--connection)))
(setq exwm-systemtray--selection-owner-window id)
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:CreateWindow
:depth 0
:wid id
:parent exwm--root
:x 0
:y 0
:width 1
:height 1
:border-width 0
:class xcb:WindowClass:InputOnly
:visual 0
:value-mask xcb:CW:OverrideRedirect
:override-redirect 1))
;; Get the selection ownership.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:SetSelectionOwner
:owner id
:selection xcb:Atom:_NET_SYSTEM_TRAY_S0
:time xcb:Time:CurrentTime))
;; Send a client message to announce the selection.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination exwm--root
:event-mask xcb:EventMask:StructureNotify
:event (xcb:marshal
(make-instance 'xcb:systemtray:-ClientMessage
:window exwm--root
:time xcb:Time:CurrentTime
:selection
xcb:Atom:_NET_SYSTEM_TRAY_S0
:owner id)
exwm-systemtray--connection)))
;; Set _NET_WM_NAME.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ewmh:set-_NET_WM_NAME
:window id
:data "EXWM: exwm-systemtray--selection-owner-window"))
;; Set the _NET_SYSTEM_TRAY_ORIENTATION property.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:xembed:set-_NET_SYSTEM_TRAY_ORIENTATION
:window id
:data xcb:systemtray:ORIENTATION:HORZ)))
;; Create the embedder.
(let ((id (xcb:generate-id exwm-systemtray--connection))
(background-pixel (exwm--color->pixel exwm-systemtray-background-color))
frame parent depth y)
(setq exwm-systemtray--embedder-window id)
(if (exwm-workspace--minibuffer-own-frame-p)
(setq frame exwm-workspace--minibuffer
y (if (>= (line-pixel-height) exwm-systemtray-height)
;; Bottom aligned.
(- (line-pixel-height) exwm-systemtray-height)
;; Vertically centered.
(/ (- (line-pixel-height) exwm-systemtray-height) 2)))
(exwm-workspace--update-offsets)
(setq frame exwm-workspace--current
;; Bottom aligned.
y (- (elt (elt exwm-workspace--workareas
exwm-workspace-current-index)
3)
exwm-workspace--frame-y-offset
exwm-systemtray-height)))
(setq parent (string-to-number (frame-parameter frame 'window-id))
depth (slot-value (xcb:+request-unchecked+reply
exwm-systemtray--connection
(make-instance 'xcb:GetGeometry
:drawable parent))
'depth))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:CreateWindow
:depth depth
:wid id
:parent parent
:x 0
:y y
:width 1
:height exwm-systemtray-height
:border-width 0
:class xcb:WindowClass:InputOutput
:visual 0
:value-mask (logior xcb:CW:BackPixmap
(if background-pixel
xcb:CW:BackPixel 0)
xcb:CW:EventMask)
:background-pixmap xcb:BackPixmap:ParentRelative
:background-pixel background-pixel
:event-mask xcb:EventMask:SubstructureNotify))
;; Set _NET_WM_NAME.
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ewmh:set-_NET_WM_NAME
:window id
:data "EXWM: exwm-systemtray--embedder-window")))
(xcb:flush exwm-systemtray--connection)
;; Attach event listeners.
(xcb:+event exwm-systemtray--connection 'xcb:DestroyNotify
#'exwm-systemtray--on-DestroyNotify)
(xcb:+event exwm-systemtray--connection 'xcb:ReparentNotify
#'exwm-systemtray--on-ReparentNotify)
(xcb:+event exwm-systemtray--connection 'xcb:ResizeRequest
#'exwm-systemtray--on-ResizeRequest)
(xcb:+event exwm-systemtray--connection 'xcb:PropertyNotify
#'exwm-systemtray--on-PropertyNotify)
(xcb:+event exwm-systemtray--connection 'xcb:ClientMessage
#'exwm-systemtray--on-ClientMessage)
(unless (exwm-workspace--minibuffer-own-frame-p)
(xcb:+event exwm-systemtray--connection 'xcb:KeyPress
#'exwm-systemtray--on-KeyPress))
;; Add hook to move/reparent the embedder.
(add-hook 'exwm-workspace-switch-hook #'exwm-systemtray--on-workspace-switch)
(add-hook 'exwm-workspace--update-workareas-hook
#'exwm-systemtray--refresh-all)
(add-hook 'menu-bar-mode-hook #'exwm-systemtray--refresh-all)
(add-hook 'tool-bar-mode-hook #'exwm-systemtray--refresh-all)
(when (boundp 'exwm-randr-refresh-hook)
(add-hook 'exwm-randr-refresh-hook #'exwm-systemtray--refresh-all))
;; The struts can be updated already.
(when exwm-workspace--workareas
(exwm-systemtray--refresh-all)))
(defun exwm-systemtray--exit ()
"Exit the systemtray module."
(exwm--log)
(when exwm-systemtray--connection
;; Hide & reparent out the embedder before disconnection to prevent
;; embedded icons from being reparented to an Emacs frame (which is the
;; parent of the embedder).
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:UnmapWindow
:window exwm-systemtray--embedder-window))
(xcb:+request exwm-systemtray--connection
(make-instance 'xcb:ReparentWindow
:window exwm-systemtray--embedder-window
:parent exwm--root
:x 0
:y 0))
(xcb:disconnect exwm-systemtray--connection)
(setq exwm-systemtray--connection nil
exwm-systemtray--list nil
exwm-systemtray--selection-owner-window nil
exwm-systemtray--embedder-window nil)
(remove-hook 'exwm-workspace-switch-hook
#'exwm-systemtray--on-workspace-switch)
(remove-hook 'exwm-workspace--update-workareas-hook
#'exwm-systemtray--refresh-all)
(remove-hook 'menu-bar-mode-hook #'exwm-systemtray--refresh-all)
(remove-hook 'tool-bar-mode-hook #'exwm-systemtray--refresh-all)
(when (boundp 'exwm-randr-refresh-hook)
(remove-hook 'exwm-randr-refresh-hook #'exwm-systemtray--refresh-all))))
(defun exwm-systemtray-enable ()
"Enable system tray support for EXWM."
(exwm--log)
(add-hook 'exwm-init-hook #'exwm-systemtray--init)
(add-hook 'exwm-exit-hook #'exwm-systemtray--exit))
(provide 'exwm-systemtray)
;;; exwm-systemtray.el ends here