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exwm/exwm-layout.el
Adrián Medraño Calvo 3763195fe3 Use `buffer-predicate' frame parameter to prevent switching to visible EXWM buffers 
* exwm-layout.el (exwm-layout--other-buffer-predicate): New
function to be set as `buffer-predicate' frame parameter.
* exwm-workspace.el (exwm-workspace--init): Use above function on
workspace frames.
2016-03-19 00:00:00 +00:00

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;;; exwm-layout.el --- Layout Module for EXWM -*- lexical-binding: t -*-
;; Copyright (C) 2015-2016 Free Software Foundation, Inc.
;; Author: Chris Feng <chris.w.feng@gmail.com>
;; 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 is responsible for keeping X client window properly displayed.
;;; Code:
(require 'exwm-core)
(defvar exwm-floating-border-width)
(defun exwm-layout--resize-container (id container x y width height
&optional container-only)
"Resize a container (and its content unless CONTAINER-ONLY is non-nil)."
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window container
:value-mask (eval-when-compile
(logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height))
:x x :y y :width width :height height))
(unless container-only
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window id
:value-mask (eval-when-compile
(logior xcb:ConfigWindow:Width
xcb:ConfigWindow:Height))
:width width :height height))))
(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)
(let* ((edges (window-inside-absolute-pixel-edges window))
(width (- (elt edges 2) (elt edges 0)))
(height (- (elt edges 3) (elt edges 1)))
frame-width frame-height)
(with-current-buffer (exwm--id->buffer id)
(if (not exwm--floating-frame)
(let ((relative-edges (window-inside-pixel-edges window)))
(exwm-layout--resize-container id exwm--container
(elt relative-edges 0)
(elt relative-edges 1)
width height
(active-minibuffer-window)))
;; A floating X window is of the same size as the Emacs window,
;; whereas its container is of the same size as the Emacs frame.
(setq frame-width (frame-pixel-width exwm--floating-frame)
frame-height (frame-pixel-height exwm--floating-frame))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window exwm--container
:value-mask (logior xcb:ConfigWindow:Width
xcb:ConfigWindow:Height)
:width frame-width
:height frame-height))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter exwm--floating-frame
'exwm-container)
:value-mask (logior xcb:ConfigWindow:Width
xcb:ConfigWindow:Height)
:width frame-width
:height frame-height))
(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 exwm-floating-border-width
:y exwm-floating-border-width
:width width
:height height)))
;; Make the resizing take effect.
(xcb:flush exwm--connection)
(xcb:+request exwm--connection (make-instance 'xcb:MapWindow :window id))
(xcb:+request exwm--connection
(make-instance 'xcb:MapWindow :window exwm--container))
(xcb:+request exwm--connection
(make-instance 'xcb:icccm:set-WM_STATE
:window id :state xcb:icccm:WM_STATE:NormalState
:icon xcb:Window:None))
(setq exwm-state xcb:icccm:WM_STATE:NormalState))
(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 (elt edges 0)
:y (elt edges 1)
:width width :height height
:border-width 0
:override-redirect 0)
exwm--connection))))
(xcb:flush exwm--connection))
(defun exwm-layout--hide (id)
"Hide window ID."
(with-current-buffer (exwm--id->buffer id)
(unless (eq xcb:icccm:WM_STATE:IconicState exwm-state) ;already hidden
(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:UnmapWindow :window exwm--container))
(xcb:+request exwm--connection
(make-instance 'xcb:icccm:set-WM_STATE
:window id
:state xcb:icccm:WM_STATE:IconicState
:icon xcb:Window:None))
(setq exwm-state xcb:icccm:WM_STATE:IconicState)
(xcb:flush exwm--connection))))
(defvar exwm-workspace--current)
(defvar exwm-workspace--list)
;;;###autoload
(defun exwm-layout-set-fullscreen (&optional id)
"Make window ID fullscreen."
(interactive)
(with-current-buffer (if id (exwm--id->buffer id) (window-buffer))
(when exwm--fullscreen
(user-error "Already in full-screen mode."))
;; Set the floating frame fullscreen first when the client is floating
(when exwm--floating-frame
(let* ((geometry (xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetGeometry
:drawable exwm--container))))
(setq exwm--floating-frame-position
(vector (slot-value geometry 'x) (slot-value geometry 'y)))))
(exwm-layout--resize-container exwm--id exwm--container 0 0
(exwm-workspace--current-width)
(exwm-workspace--current-height))
;; Raise the X window.
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window exwm--container
:value-mask xcb:ConfigWindow:StackMode
:stack-mode xcb:StackMode:Above))
(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)
(setq exwm--fullscreen t)
(exwm-input-release-keyboard)))
;;;###autoload
(defun exwm-layout-unset-fullscreen (&optional id)
"Restore window from fullscreen state."
(interactive)
(with-current-buffer (if id (exwm--id->buffer id) (window-buffer))
(unless exwm--fullscreen
(user-error "Not in full-screen mode."))
(if exwm--floating-frame
;; Restore the floating frame.
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window exwm--container
:value-mask (eval-when-compile
(logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y))
:x (elt exwm--floating-frame-position 0)
:y (elt exwm--floating-frame-position 1)))
;; Put the X window just above the Emacs frame.
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window exwm--container
:value-mask (logior xcb:ConfigWindow:Sibling
xcb:ConfigWindow:StackMode)
:sibling (frame-parameter exwm-workspace--current
'exwm-container)
:stack-mode xcb:StackMode:Above)))
(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)
(setq exwm--fullscreen nil)
(exwm-input-grab-keyboard)))
(defvar exwm-layout--fullscreen-frame-count 0
"Count the fullscreen workspace frames.")
;; This function is superficially similar to `exwm-layout-set-fullscreen', but
;; they do very different things: `exwm-layout--set-frame-fullscreen' resizes a
;; frame to the actual monitor size, `exwm-layout-set-fullscreen' resizes an X
;; window to the frame size.
(defun exwm-layout--set-frame-fullscreen (frame)
"Make frame FRAME fullscreen, with regard to its RandR output if applicable."
(let ((geometry (or (frame-parameter frame 'exwm-geometry)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:GetGeometry
:drawable exwm--root))
(make-instance 'xcb:RECTANGLE :x 0 :y 0
:width (x-display-pixel-width)
:height (x-display-pixel-height))))
(id (frame-parameter frame 'exwm-outer-id))
(container (frame-parameter frame 'exwm-container))
(workspace (frame-parameter frame 'exwm-workspace)))
(with-slots (x y width height) geometry
(when (and (eq frame exwm-workspace--current)
(exwm-workspace--minibuffer-own-frame-p))
(exwm-workspace--resize-minibuffer-frame width height))
(exwm-layout--resize-container id container 0 0 width height)
(exwm-layout--resize-container nil workspace x y width height t)
(xcb:flush exwm--connection)))
(cl-incf exwm-layout--fullscreen-frame-count))
(defun exwm-layout--other-buffer-predicate (buffer)
"Return non-nil when the BUFFER may be displayed in selected frame.
Prevents EXWM-mode buffers already being displayed on some other window from
being selected.
Should be set as `buffer-predicate' frame parameter for all
frames. Used by `other-buffer'."
(not (and (eq 'exwm-mode (buffer-local-value 'major-mode buffer))
(get-buffer-window buffer t))))
(defvar exwm-layout-show-all-buffers nil
"Non-nil to allow switching to buffers on other workspaces.")
(defun exwm-layout--refresh ()
"Refresh layout."
(let ((frame (selected-frame))
(placeholder (or (get-buffer "*scratch*")
(progn
(set-buffer-major-mode
(get-buffer-create "*scratch*"))
(get-buffer "*scratch*"))))
windows)
(if (not (memq frame exwm-workspace--list))
(if (frame-parameter frame 'exwm-outer-id)
;; Refresh a floating frame
(let ((window (frame-first-window frame)))
(with-current-buffer (window-buffer window)
(when (and (eq major-mode 'exwm-mode)
;; It may be a buffer waiting to be killed.
(exwm--id->buffer exwm--id))
(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
(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)
(dolist (pair exwm--id-buffer-alist)
(with-current-buffer (cdr pair)
(when (and (not exwm--floating-frame) ;exclude floating X windows
(or exwm-layout-show-all-buffers
;; Exclude X windows on other workspaces
(eq frame exwm--frame)))
(setq windows (get-buffer-window-list (current-buffer) 0))
(if (not windows)
(when (eq frame exwm--frame) ;for exwm-layout-show-all-buffers
(exwm-layout--hide exwm--id))
(let ((window (car windows)))
(if (eq frame exwm--frame)
(exwm-layout--show exwm--id window)
(exwm-workspace-move-window
(cl-position frame exwm-workspace--list) exwm--id))
;; Make sure this buffer is not displayed elsewhere
(dolist (i (get-buffer-window-list (current-buffer) 0 t))
(unless (eq i window)
(set-window-buffer i placeholder))))))))
;; Make sure windows floating / on other workspaces are excluded
(dolist (window (window-list frame 0))
(with-current-buffer (window-buffer window)
(when (and (eq major-mode 'exwm-mode)
(or exwm--floating-frame (not (eq frame exwm--frame))))
(set-window-buffer window placeholder))))
;; Update _NET_CLIENT_LIST_STACKING
(xcb:+request exwm--connection
(make-instance 'xcb:ewmh:set-_NET_CLIENT_LIST_STACKING
:window exwm--root
:data (vconcat
(delq nil
(mapcar
(lambda (buffer)
(with-current-buffer buffer
(when (eq major-mode 'exwm-mode)
exwm--id)))
(buffer-list))))))
(xcb:flush exwm--connection))))
(defun exwm-layout--on-minibuffer-setup ()
"Refresh layout when minibuffer grows."
(run-with-idle-timer 0.01 nil ;FIXME
(lambda ()
(when (< 1 (window-height (minibuffer-window)))
(exwm-layout--refresh))))
;; Set input focus on the Emacs frame
(x-focus-frame (window-frame (minibuffer-selected-window))))
(defun exwm-layout--on-echo-area-change (&optional dirty)
"Run when message arrives or in `echo-area-clear-hook' to refresh layout."
(when (and (current-message)
(or (cl-position ?\n (current-message))
(> (length (current-message))
(frame-width exwm-workspace--current))))
(if dirty
(exwm-layout--refresh)
(run-with-idle-timer 0.01 nil #'exwm-layout--refresh)))) ;FIXME
;;;###autoload
(defun exwm-layout-enlarge-window (delta &optional horizontal)
"Make the selected window DELTA pixels taller.
If no argument is given, make the selected window one pixel taller. If the
optional argument HORIZONTAL is non-nil, make selected window DELTA pixels
wider. If DELTA is negative, shrink selected window by -DELTA pixels.
Normal hints are checked and regarded if the selected window is displaying an
`exwm-mode' buffer. However, this may violate the normal hints set on other X
windows."
(interactive "p")
(cond
((zerop delta)) ;no operation
((window-minibuffer-p)) ;avoid resize minibuffer-window
((not (and (eq major-mode 'exwm-mode) exwm--floating-frame))
;; Resize on tiling layout
(unless (= 0 (window-resizable nil delta horizontal nil t)) ;not resizable
(let ((window-resize-pixelwise t))
(window-resize nil delta horizontal nil t))))
;; Resize on floating layout
(exwm--fixed-size) ;fixed size
(horizontal
(let* ((width (frame-pixel-width))
(edges (window-inside-pixel-edges))
(inner-width (- (elt edges 2) (elt edges 0)))
(margin (- width inner-width)))
(if (> delta 0)
(if (not exwm--normal-hints-max-width)
(cl-incf width delta)
(if (>= inner-width exwm--normal-hints-max-width)
(setq width nil)
(setq width (min (+ exwm--normal-hints-max-width margin)
(+ width delta)))))
(if (not exwm--normal-hints-min-width)
(cl-incf width delta)
(if (<= inner-width exwm--normal-hints-min-width)
(setq width nil)
(setq width (max (+ exwm--normal-hints-min-width margin)
(+ width delta))))))
(when width
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter exwm--floating-frame
'exwm-outer-id)
:value-mask xcb:ConfigWindow:Width
:width width))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter exwm--floating-frame
'exwm-container)
:value-mask xcb:ConfigWindow:Width
:width width))
(xcb:flush exwm--connection))))
(t
(let* ((height (frame-pixel-height))
(edges (window-inside-pixel-edges))
(inner-height (- (elt edges 3) (elt edges 1)))
(margin (- height inner-height)))
(if (> delta 0)
(if (not exwm--normal-hints-max-height)
(cl-incf height delta)
(if (>= inner-height exwm--normal-hints-max-height)
(setq height nil)
(setq height (min (+ exwm--normal-hints-max-height margin)
(+ height delta)))))
(if (not exwm--normal-hints-min-height)
(cl-incf height delta)
(if (<= inner-height exwm--normal-hints-min-height)
(setq height nil)
(setq height (max (+ exwm--normal-hints-min-height margin)
(+ height delta))))))
(when height
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter exwm--floating-frame
'exwm-outer-id)
:value-mask xcb:ConfigWindow:Height
:height height))
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter exwm--floating-frame
'exwm-container)
:value-mask xcb:ConfigWindow:Height
:height height))
(xcb:flush exwm--connection))))))
;;;###autoload
(defun exwm-layout-enlarge-window-horizontally (delta)
"Make the selected window DELTA pixels wider.
See also `exwm-layout-enlarge-window'."
(interactive "p")
(exwm-layout-enlarge-window delta t))
;;;###autoload
(defun exwm-layout-shrink-window (delta)
"Make the selected window DELTA pixels lower.
See also `exwm-layout-enlarge-window'."
(interactive "p")
(exwm-layout-enlarge-window (- delta)))
;;;###autoload
(defun exwm-layout-shrink-window-horizontally (delta)
"Make the selected window DELTA pixels narrower.
See also `exwm-layout-enlarge-window'."
(interactive "p")
(exwm-layout-enlarge-window (- delta) t))
;;;###autoload
(defun exwm-layout-hide-mode-line ()
"Hide mode-line."
(interactive)
(when (and (eq major-mode 'exwm-mode) mode-line-format)
(let (mode-line-height)
(when exwm--floating-frame
(setq mode-line-height (window-mode-line-height
(frame-root-window exwm--floating-frame))))
(setq exwm--mode-line-format mode-line-format
mode-line-format nil)
(if (not exwm--floating-frame)
(exwm-layout--show exwm--id)
(set-frame-height exwm--floating-frame
(- (frame-pixel-height exwm--floating-frame)
mode-line-height)
nil t)))))
;;;###autoload
(defun exwm-layout-show-mode-line ()
"Show mode-line."
(interactive)
(when (and (eq major-mode 'exwm-mode) (not mode-line-format))
(setq mode-line-format exwm--mode-line-format
exwm--mode-line-format nil)
(if (not exwm--floating-frame)
(exwm-layout--show exwm--id)
(set-frame-height exwm--floating-frame
(+ (frame-pixel-height exwm--floating-frame)
(window-mode-line-height (frame-root-window
exwm--floating-frame)))
nil t)
(exwm-input-grab-keyboard))
(force-mode-line-update)))
;;;###autoload
(defun exwm-layout-toggle-mode-line ()
"Toggle the display of mode-line."
(interactive)
(when (eq major-mode 'exwm-mode)
(if mode-line-format
(exwm-layout-hide-mode-line)
(exwm-layout-show-mode-line))))
(defun exwm-layout--init ()
"Initialize layout module."
;; Auto refresh layout
(add-hook 'window-configuration-change-hook #'exwm-layout--refresh)
(unless (exwm-workspace--minibuffer-own-frame-p)
;; Refresh when minibuffer grows
(add-hook 'minibuffer-setup-hook #'exwm-layout--on-minibuffer-setup t)
(run-with-idle-timer 0 t #'exwm-layout--on-echo-area-change t)
(add-hook 'echo-area-clear-hook #'exwm-layout--on-echo-area-change)))
(provide 'exwm-layout)
;;; exwm-layout.el ends here
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