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;;; exwm-layout.el --- Layout Module for EXWM -*- lexical-binding: t -*-
;; 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 module is responsible for keeping X client window properly displayed.
;;; Code:
(defun exwm-layout--show (id &optional window)
"Show window ID exactly fit in the Emacs window WINDOW."
(exwm--log "Show #x%x in %s" id window)
(xcb:+request exwm--connection (make-instance 'xcb:MapWindow :window id))
(xcb:+request exwm--connection
(make-instance 'xcb:icccm:set-WM_STATE
:window id :state xcb:icccm:WM_STATE:NormalState
:icon xcb:Window:None))
(let* ((edges (or (exwm--with-current-id id exwm--floating-edges)
(window-inside-pixel-edges window)))
(x (elt edges 0))
(y (elt edges 1))
(width (- (elt edges 2) (elt edges 0)))
(height (- (elt edges 3) (elt edges 1))))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window id
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height
xcb:ConfigWindow:StackMode)
:x x :y y :width width :height height
;; In order to put non-floating window at bottom
:stack-mode xcb:StackMode:Below))
(xcb:+request exwm--connection
(make-instance 'xcb:SendEvent
:propagate 0 :destination id
:event-mask xcb:EventMask:StructureNotify
:event (xcb:marshal
(make-instance 'xcb:ConfigureNotify
:event id :window id
:above-sibling xcb:Window:None
:x x :y y
:width width :height height
:border-width 0
:override-redirect 0)
exwm--connection))))
(xcb:flush exwm--connection))
(defun exwm-layout--hide (id)
"Hide window ID."
(unless (eq xcb:icccm:WM_STATE:IconicState ;already hidden
(with-current-buffer (exwm--id->buffer id) exwm-state))
(exwm--log "Hide #x%x" id)
(xcb:+request exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window id :value-mask xcb:CW:EventMask
:event-mask xcb:EventMask:NoEvent))
(xcb:+request exwm--connection (make-instance 'xcb:UnmapWindow :window id))
(xcb:+request exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window id :value-mask xcb:CW:EventMask
:event-mask exwm--client-event-mask))
(xcb:+request exwm--connection
(make-instance 'xcb:icccm:set-WM_STATE
:window id
:state xcb:icccm:WM_STATE:IconicState
:icon xcb:Window:None))
(xcb:flush exwm--connection)))
(defun exwm-layout-set-fullscreen (&optional id)
"Make window ID fullscreen."
(interactive)
(with-current-buffer (if id (exwm--id->buffer id) (window-buffer))
;; Set the floating frame fullscreen first when the client is floating
(when exwm--floating-frame
(let* ((outer-id (frame-parameter exwm--floating-frame 'exwm-outer-id))
(geometry (xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetGeometry
:drawable outer-id))))
(setq exwm--floating-frame-geometry
(vector (slot-value geometry 'x) (slot-value geometry 'y)
(slot-value geometry 'width)
(slot-value geometry 'height)))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window outer-id
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height)
:x 0 :y 0
:width (x-display-pixel-width)
:height (x-display-pixel-height))))
(xcb:flush exwm--connection))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window exwm--id
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height)
:x 0 :y 0
:width (x-display-pixel-width)
:height (x-display-pixel-height)))
(xcb:+request exwm--connection
(make-instance 'xcb:ewmh:set-_NET_WM_STATE
:window exwm--id
:data (vector xcb:Atom:_NET_WM_STATE_FULLSCREEN)))
(xcb:flush exwm--connection)
(cl-assert (not exwm--fullscreen))
(setq exwm--fullscreen t)
(exwm-input-release-keyboard)))
(defun exwm-layout-unset-fullscreen (&optional id)
"Restore window from fullscreen state."
(interactive)
(with-current-buffer (if id (exwm--id->buffer id) (window-buffer))
;; Restore the floating frame if the client is floating
(when exwm--floating-frame
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter exwm--floating-frame
'exwm-outer-id)
:value-mask (logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height)
:x (elt exwm--floating-frame-geometry 0)
:y (elt exwm--floating-frame-geometry 1)
:width (elt exwm--floating-frame-geometry 2)
:height (elt exwm--floating-frame-geometry 3))))
(exwm-layout--show exwm--id)
(xcb:+request exwm--connection
(make-instance 'xcb:ewmh:set-_NET_WM_STATE :window exwm--id :data []))
(xcb:flush exwm--connection)
(cl-assert exwm--fullscreen)
(setq exwm--fullscreen nil)
(exwm-input-grab-keyboard)))
(defun exwm-layout--refresh ()
"Refresh layout."
(let ((frame (selected-frame))
(placeholder (get-buffer "*scratch*"))
windows)
(if (not (memq frame exwm-workspace--list))
(if (frame-parameter frame 'exwm-window-id)
;; Refresh a floating frame
(progn
(cl-assert (eq major-mode 'exwm-mode))
(let ((window (frame-first-window frame)))
(with-current-buffer (window-buffer window)
(exwm--log "Refresh floating window #x%x" exwm--id)
(exwm-layout--show exwm--id window))))
;; Other frames (e.g. terminal/graphical frame of emacsclient)
;; We shall bury all `exwm-mode' buffers in this case
(unless placeholder ;create the *scratch* buffer if it's killed
(setq placeholder (get-buffer-create "*scratch*"))
(set-buffer-major-mode placeholder))
(setq windows (window-list frame 0)) ;exclude minibuffer
(dolist (window windows)
(with-current-buffer (window-buffer window)
(when (eq major-mode 'exwm-mode)
(set-window-buffer window placeholder)))))
;; Refresh the whole workspace
;; Workspaces other than the active one can also be refreshed (RandR)
(exwm--log "Refresh workspace %s" frame)
(unless placeholder ;create the *scratch* buffer if it's killed
(setq placeholder (get-buffer-create "*scratch*"))
(set-buffer-major-mode placeholder))
(dolist (pair exwm--id-buffer-alist)
(with-current-buffer (cdr pair)
;; Exclude windows on other workspaces and floating frames
(when (and (eq frame exwm--frame) (not exwm--floating-frame))
(setq windows (get-buffer-window-list (current-buffer) 0))
(if (not windows)
(exwm-layout--hide exwm--id)
(exwm-layout--show exwm--id (car windows))
(dolist (i (cdr windows))
(set-window-buffer i placeholder)))))))))
(defun exwm-layout--on-minibuffer-setup ()
"Refresh layout when minibuffer grows."
(run-with-idle-timer 0.01 nil ;FIXME
(lambda ()
(when (and (< 1 (window-height (minibuffer-window)))
(not (and (eq major-mode 'exwm-mode)
exwm--floating-frame)))
(exwm-layout--refresh)))))
(defun exwm-layout--init ()
"Initialize layout module."
;; Auto refresh layout
(add-hook 'window-configuration-change-hook 'exwm-layout--refresh)
;; Refresh when minibuffer grows
(add-hook 'minibuffer-setup-hook 'exwm-layout--on-minibuffer-setup t))
(provide 'exwm-layout)
;;; exwm-layout.el ends here
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