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snix/exwm-manage.el
Chris Feng edc70eb661 Remove redundant code caused by the concurrency of events 
With the introduction of ch11ng/xelb@6a7bccc, many weird behaviors should
disappear. These include by not limit to
* race conditions when managing a window (a workaround is provided in @14628a9)
* race conditions when unmanaging a window
This commit removes some corresponding code.
2015-08-09 18:05:13 +08:00

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;;; exwm-manage.el --- Window Management Module for -*- lexical-binding: t -*-
;;; EXWM
;; Copyright (C) 2015 Chris Feng
;; Author: Chris Feng <chris.w.feng@gmail.com>
;; Keywords: unix
;; This file is not part of GNU Emacs.
;; This file 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.
;; This file 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 this file. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This is the fundamental module of EXWM that deals with window management.
;;; Code:
(require 'exwm-input)
(defvar exwm-manage-finish-hook nil
"Normal hook run after a window is just managed, in the context of the
corresponding buffer.")
(defun exwm-manage--update-geometry (id &optional force)
"Update window geometry."
(exwm--with-current-id id
(unless (and exwm--geometry (not force))
(let ((reply (xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetGeometry :drawable id))))
(when reply ;nil when destroyed
(setq exwm--geometry reply))))))
(defun exwm-manage--manage-window (id)
"Manage window ID."
(exwm--log "Try to manage #x%x" id)
(setq exwm-input--focus-lock t)
(catch 'return
;; Ensure it's not managed
(when (assoc id exwm--id-buffer-alist)
(exwm--log "#x%x is already managed" id)
(throw 'return 'managed))
;; Ensure it's alive
(when (xcb:+request-checked+request-check exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window id :value-mask xcb:CW:EventMask
:event-mask exwm--client-event-mask))
(throw 'return 'dead))
(with-current-buffer (generate-new-buffer "*EXWM*")
(push `(,id . ,(current-buffer)) exwm--id-buffer-alist)
(exwm-mode)
(setq exwm--id id)
(exwm--update-window-type id)
(exwm--update-class id)
(exwm-manage--update-geometry id)
;; No need to manage (please check OverrideRedirect outside)
(when (or
(not
(or (not exwm-window-type)
(memq xcb:Atom:_NET_WM_WINDOW_TYPE_UTILITY exwm-window-type)
(memq xcb:Atom:_NET_WM_WINDOW_TYPE_DIALOG exwm-window-type)
(memq xcb:Atom:_NET_WM_WINDOW_TYPE_NORMAL exwm-window-type)))
;; For Java applications
(and exwm-instance-name
(string-prefix-p "sun-awt-X11-" exwm-instance-name)
(not (string-suffix-p "XFramePeer" exwm-instance-name))))
(exwm--log "No need to manage #x%x" id)
;; Remove all events
(xcb:+request-checked+request-check exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window id :value-mask xcb:CW:EventMask
:event-mask xcb:EventMask:NoEvent))
;; The window needs to be mapped
(xcb:+request exwm--connection
(make-instance xcb:MapWindow :window id))
(with-slots (x y width height) exwm--geometry
;; Reparent to virtual root (essential)
(xcb:+request exwm--connection
(make-instance 'xcb:ReparentWindow
:window id
:parent (frame-parameter exwm-workspace--current
'exwm-window-id)
:x x :y y))
;; Center window of type _NET_WM_WINDOW_TYPE_SPLASH
(when (memq xcb:Atom:_NET_WM_WINDOW_TYPE_SPLASH exwm-window-type)
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window id
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y)
:x (/ (- (x-display-pixel-width) width) 2)
:y (/ (- (x-display-pixel-height) height) 2)))))
(xcb:flush exwm--connection)
(setq kill-buffer-query-functions nil)
(setq exwm--id-buffer-alist (assq-delete-all id exwm--id-buffer-alist))
(kill-buffer (current-buffer))
(throw 'return 'ignored))
;; Manage the window
(exwm--log "Manage #x%x" id)
(xcb:+request exwm--connection ;remove border
(make-instance 'xcb:ConfigureWindow
:window id :value-mask xcb:ConfigWindow:BorderWidth
:border-width 0))
(xcb:+request exwm--connection ;grab buttons for set focus/move/resize
(make-instance 'xcb:GrabButton
:owner-events 0 :grab-window id
:event-mask xcb:EventMask:ButtonPress
:pointer-mode xcb:GrabMode:Sync
:keyboard-mode xcb:GrabMode:Async
:confine-to xcb:Window:None
:cursor xcb:Cursor:None
:button xcb:ButtonIndex:Any
:modifiers xcb:ModMask:Any))
(xcb:flush exwm--connection)
(exwm--update-title id)
(exwm--update-transient-for id)
(exwm--update-normal-hints id)
(exwm--update-hints id)
(exwm--update-protocols id)
(exwm--update-state id)
(if (or exwm-transient-for exwm--fixed-size
(memq xcb:Atom:_NET_WM_WINDOW_TYPE_UTILITY exwm-window-type)
(memq xcb:Atom:_NET_WM_WINDOW_TYPE_DIALOG exwm-window-type))
(exwm-floating--set-floating id)
(exwm-floating--unset-floating id))
(exwm-input-grab-keyboard id)
(exwm-workspace--update-switch-history)
(setq exwm-input--focus-lock nil) ;unlocked in advance
(exwm--with-current-id id
(run-hooks 'exwm-manage-finish-hook))))
(setq exwm-input--focus-lock nil))
(defun exwm-manage--unmanage-window (id &optional withdraw-only)
"Unmanage window ID."
(let ((buffer (exwm--id->buffer id)))
(exwm--log "Unmanage #x%x (buffer: %s)" id buffer)
(setq exwm--id-buffer-alist (assq-delete-all id exwm--id-buffer-alist))
(when (buffer-live-p buffer)
(with-current-buffer buffer
(exwm-workspace--update-switch-history)
;;
(when withdraw-only
;; Reparent back to root
(xcb:+request exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window id :value-mask xcb:CW:EventMask
:event-mask xcb:EventMask:NoEvent))
(let (x y geometry geometry-parent)
(if (not exwm--floating-frame)
(setq x 0 y 0) ;the position does not matter
(setq geometry-parent
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetGeometry
:drawable
(frame-parameter exwm--floating-frame
'exwm-outer-id)))
geometry (xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetGeometry
:drawable id)))
(if (not (and geometry-parent geometry))
(setq x 0 y 0) ;e.g. have been destroyed
(setq x (+ (slot-value geometry-parent 'x)
(slot-value geometry 'x))
y (+ (slot-value geometry-parent 'y)
(slot-value geometry 'y)))))
(xcb:+request exwm--connection
(make-instance 'xcb:ReparentWindow
:window id :parent exwm--root :x x :y y)))
;; Delete WM_STATE property
(xcb:+request exwm--connection
(make-instance 'xcb:DeleteProperty
:window id :property xcb:Atom:WM_STATE))
(xcb:flush exwm--connection))
(setq kill-buffer-query-functions nil)
(let ((floating exwm--floating-frame))
(kill-buffer)
(when floating
(if (eq 'exwm-mode
(with-current-buffer
(window-buffer
(frame-first-window exwm-workspace--current))
major-mode))
;; Input focus is to be set on a window
(x-focus-frame exwm-workspace--current)
;; Set input focus on a frame
(select-frame-set-input-focus exwm-workspace--current))))))))
(defun exwm-manage--scan ()
"Search for existing windows and try to manage them."
(let* ((tree (xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:QueryTree :window exwm--root))))
(dolist (i (slot-value tree 'children))
(with-slots (override-redirect map-state)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetWindowAttributes :window i))
(when (and (= 0 override-redirect) (= xcb:MapState:Viewable map-state))
(exwm-manage--manage-window i))))))
(defvar exwm-manage--ping-lock nil
"Non-nil indicates EXWM is pinging a window.")
(defvar exwm-manage-ping-timeout 3 "Seconds to wait before killing a client.")
(defun exwm-manage--close-window (id &optional buffer)
"Close window ID in a proper way."
(catch 'return
(unless buffer (setq buffer (exwm--id->buffer id)))
;; Destroy the client window if it does not support WM_DELETE_WINDOW
(unless (and (buffer-live-p buffer)
(with-current-buffer buffer
(memq xcb:Atom:WM_DELETE_WINDOW exwm--protocols)))
(xcb:+request exwm--connection
(make-instance 'xcb:DestroyWindow :window id))
(xcb:flush exwm--connection)
(throw 'return nil))
;; Try to close the window with WM_DELETE_WINDOW client message
(xcb:+request exwm--connection
(make-instance 'xcb:icccm:SendEvent
:destination id
:event (xcb:marshal
(make-instance 'xcb:icccm:WM_DELETE_WINDOW
:window id)
exwm--connection)))
(xcb:flush exwm--connection)
;; Try to determine if the client stop responding
;; FIXME: check
(with-current-buffer buffer
(when (memq xcb:Atom:_NET_WM_PING exwm--protocols)
(setq exwm-manage--ping-lock t)
(xcb:+request exwm--connection
(make-instance 'xcb:SendEvent
:propagate 0 :destination id
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal
(make-instance 'xcb:ewmh:_NET_WM_PING
:window id :timestamp 0
:client-window id)
exwm--connection)))
(xcb:flush exwm--connection)
(with-timeout (exwm-manage-ping-timeout
(if (yes-or-no-p (format "\
`%s' is not responding. Would you like to kill it? " (buffer-name buffer)))
(progn (exwm-manage--kill-client id)
(throw 'return nil))
(throw 'return nil)))
(while (and exwm-manage--ping-lock
(exwm--id->buffer id)) ;may have be destroyed
(accept-process-output nil 0.1)))
(throw 'return nil)))
(throw 'return nil)))
(defun exwm-manage--kill-client (&optional id)
"Kill an X client."
(interactive)
(unless id (setq id (exwm--buffer->id (current-buffer))))
(let ((pid (slot-value
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:ewmh:get-_NET_WM_PID :window id))
'value)))
(if pid
(signal-process pid 'SIGKILL)
(xcb:+request exwm--connection
(make-instance 'xcb:KillClient :resource id))
(xcb:flush exwm--connection))))
(defun exwm-manage--on-ConfigureRequest (data synthetic)
"Handle ConfigureRequest event."
(let ((obj (make-instance 'xcb:ConfigureRequest))
buffer edges)
(xcb:unmarshal obj data)
(with-slots (window x y width height border-width) obj
(if (setq buffer (exwm--id->buffer window))
;; Send client message for managed windows
(with-current-buffer buffer
(setq edges
(if exwm--fullscreen
(list 0 0
(x-display-pixel-width) (x-display-pixel-height))
(or exwm--floating-edges
(window-inside-absolute-pixel-edges
(get-buffer-window)))))
(xcb:+request exwm--connection
(make-instance 'xcb:SendEvent
:propagate 0 :destination window
:event-mask xcb:EventMask:StructureNotify
:event (xcb:marshal
(make-instance
'xcb:ConfigureNotify
:event window :window window
:above-sibling xcb:Window:None
:x (elt edges 0) :y (elt edges 1)
:width (- (elt edges 2) (elt edges 0))
:height (- (elt edges 3) (elt edges 1))
:border-width 0 :override-redirect 0)
exwm--connection))))
;; Configure unmanaged windows
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window window
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height
xcb:ConfigWindow:BorderWidth)
:x x :y y :width width :height height
:border-width border-width)))))
(xcb:flush exwm--connection))
(defun exwm-manage--on-MapRequest (data synthetic)
"Handle MapRequest event."
(let ((obj (make-instance 'xcb:MapRequest)))
(xcb:unmarshal obj data)
(exwm-manage--manage-window (slot-value obj 'window))))
(defun exwm-manage--on-UnmapNotify (data synthetic)
"Handle UnmapNotify event."
(unless synthetic
(let ((obj (make-instance 'xcb:UnmapNotify)))
(xcb:unmarshal obj data)
(exwm-manage--unmanage-window (slot-value obj 'window) t))))
(defun exwm-manage--on-DestroyNotify (data synthetic)
"Handle DestroyNotify event."
(unless synthetic
(let ((obj (make-instance 'xcb:DestroyNotify)))
(xcb:unmarshal obj data)
(exwm-manage--unmanage-window (slot-value obj 'window)))))
(defun exwm-manage--init ()
"Initialize manage module."
(xcb:+event exwm--connection 'xcb:ConfigureRequest
'exwm-manage--on-ConfigureRequest)
(xcb:+event exwm--connection 'xcb:MapRequest 'exwm-manage--on-MapRequest)
(xcb:+event exwm--connection 'xcb:UnmapNotify 'exwm-manage--on-UnmapNotify)
(xcb:+event exwm--connection 'xcb:DestroyNotify
'exwm-manage--on-DestroyNotify))
(provide 'exwm-manage)
;;; exwm-manage.el ends here
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