;;; exwm-layout.el --- Layout Module for EXWM -*- lexical-binding: t -*- ;; Copyright (C) 2015-2018 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) (defvar exwm-workspace--id-struts-alist) (defun exwm-layout--set-state (id state) "Set WM_STATE." (xcb:+request exwm--connection (make-instance 'xcb:icccm:set-WM_STATE :window id :state state :icon xcb:Window:None)) (with-current-buffer (exwm--id->buffer id) (setq exwm-state state))) (defun exwm-layout--iconic-state-p (&optional id) (= xcb:icccm:WM_STATE:IconicState (if id (buffer-local-value 'exwm-state (exwm--id->buffer id)) exwm-state))) (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)) (x (pop edges)) (y (pop edges)) (width (- (pop edges) x)) (height (- (pop edges) y)) frame-x frame-y frame-width frame-height) (with-current-buffer (exwm--id->buffer id) (when exwm--floating-frame (setq frame-width (frame-pixel-width exwm--floating-frame) frame-height (frame-pixel-height exwm--floating-frame)) (when exwm--floating-frame-position (setq frame-x (elt exwm--floating-frame-position 0) frame-y (elt exwm--floating-frame-position 1) ;; The frame was placed at (-1, -1). x (+ x frame-x 1) y (+ y frame-y 1)) (setq exwm--floating-frame-position nil)) (exwm--set-geometry (frame-parameter exwm--floating-frame 'exwm-container) frame-x frame-y frame-width frame-height)) (exwm--set-geometry id x y width height) (xcb:+request exwm--connection (make-instance 'xcb:MapWindow :window id)) (exwm-layout--set-state id xcb:icccm:WM_STATE:NormalState))) (xcb:flush exwm--connection)) (defun exwm-layout--hide (id) "Hide window ID." (with-current-buffer (exwm--id->buffer id) (unless (exwm-layout--iconic-state-p) ;already hidden (exwm--log "Hide #x%x" id) (when exwm--floating-frame (let* ((container (frame-parameter exwm--floating-frame 'exwm-container)) (geometry (xcb:+request-unchecked+reply exwm--connection (make-instance 'xcb:GetGeometry :drawable container)))) (setq exwm--floating-frame-position (vector (slot-value geometry 'x) (slot-value geometry 'y))) (exwm--set-geometry container -1 -1 1 1))) (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)) (exwm-layout--set-state id xcb:icccm:WM_STATE:IconicState) (xcb:flush exwm--connection)))) (defvar exwm-workspace--current) (declare-function exwm-input-grab-keyboard "exwm-input.el") (declare-function exwm-input-release-keyboard "exwm-input.el") (declare-function exwm-workspace--current-height "exwm-workspace.el") (declare-function exwm-workspace--current-width "exwm-workspace.el") (declare-function exwm-workspace--minibuffer-own-frame-p "exwm-workspace.el") (declare-function exwm-workspace-move-window "exwm-workspace.el" (frame-or-index &optional id)) ;;;###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 (memq xcb:Atom:_NET_WM_STATE_FULLSCREEN exwm--ewmh-state) (user-error "Already in full-screen mode")) ;; Expand the X window to fill the whole screen. ;; Rationale: Floating X windows may not be positioned at (0, 0) ;; due to the extra border. (exwm--set-geometry exwm--id 0 0 (exwm-workspace--current-width) (exwm-workspace--current-height)) ;; Raise the X window. (xcb:+request exwm--connection (make-instance 'xcb:ConfigureWindow :window exwm--id :value-mask (logior xcb:ConfigWindow:BorderWidth xcb:ConfigWindow:StackMode) :border-width 0 :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) (cl-pushnew xcb:Atom:_NET_WM_STATE_FULLSCREEN exwm--ewmh-state) (call-interactively #'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 (memq xcb:Atom:_NET_WM_STATE_FULLSCREEN exwm--ewmh-state) (user-error "Not in full-screen mode")) (if exwm--floating-frame (exwm-layout--show exwm--id (frame-root-window exwm--floating-frame)) (xcb:+request exwm--connection (make-instance 'xcb:ConfigureWindow :window exwm--id :value-mask (logior xcb:ConfigWindow:Sibling xcb:ConfigWindow:StackMode) :sibling exwm--guide-window :stack-mode xcb:StackMode:Above)) (let ((window (get-buffer-window nil t))) (when window (exwm-layout--show exwm--id window)))) (xcb:+request exwm--connection (make-instance 'xcb:ewmh:set-_NET_WM_STATE :window exwm--id :data [])) (xcb:flush exwm--connection) (setq exwm--ewmh-state (delq xcb:Atom:_NET_WM_STATE_FULLSCREEN exwm--ewmh-state)) (call-interactively #'exwm-input-grab-keyboard))) ;;;###autoload (defun exwm-layout-toggle-fullscreen (&optional id) "Toggle fullscreen mode." (interactive (list (exwm--buffer->id (window-buffer)))) (when id (with-current-buffer (exwm--id->buffer id) (if (memq xcb:Atom:_NET_WM_STATE_FULLSCREEN exwm--ewmh-state) (exwm-reset) (exwm-layout-set-fullscreen id))))) (defvar exwm-layout--other-buffer-exclude-exwm-mode-buffers nil "When non-nil, prevent EXWM buffers from being selected by `other-buffer'.") (defvar exwm-layout--other-buffer-exclude-buffers nil "List of buffers that should not be selected by `other-buffer'.") (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'. When variable `exwm-layout--other-buffer-exclude-exwm-mode-buffers' is t EXWM buffers are never selected by `other-buffer'. When variable `exwm-layout--other-buffer-exclude-buffers' is a list of buffers, EXWM buffers belonging to that list are never selected by `other-buffer'." (or (not (eq 'exwm-mode (buffer-local-value 'major-mode buffer))) (and (not exwm-layout--other-buffer-exclude-exwm-mode-buffers) (not (memq buffer exwm-layout--other-buffer-exclude-buffers)) ;; Do not select if already shown in some window. (not (get-buffer-window buffer t))))) (defvar exwm-layout-show-all-buffers nil "Non-nil to allow switching to buffers on other workspaces.") (declare-function exwm-workspace--workspace-p "exwm-workspace.el" (workspace)) (defun exwm-layout--set-client-list-stacking () "Set _NET_CLIENT_LIST_STACKING." (let (id clients-floating clients clients-iconic clients-other) (dolist (pair exwm--id-buffer-alist) (setq id (car pair)) (with-current-buffer (cdr pair) (if (eq exwm--frame exwm-workspace--current) (if exwm--floating-frame ;; A floating X window on the current workspace. (setq clients-floating (cons id clients-floating)) (if (get-buffer-window (cdr pair) exwm-workspace--current) ;; A normal tilling X window on the current workspace. (setq clients (cons id clients)) ;; An iconic tilling X window on the current workspace. (setq clients-iconic (cons id clients-iconic)))) ;; X window on other workspaces. (setq clients-other (cons id clients-other))))) (xcb:+request exwm--connection (make-instance 'xcb:ewmh:set-_NET_CLIENT_LIST_STACKING :window exwm--root :data (vconcat (append clients-other clients-iconic clients clients-floating)))))) (defun exwm-layout--refresh (&optional frame) "Refresh layout." ;; `window-size-change-functions' sets this argument while ;; `window-configuration-change-hook' makes the frame selected. (unless frame (setq frame (selected-frame))) (let (covered-buffers ;EXWM-buffers covered by a new X window. vacated-windows ;Windows previously displaying EXWM-buffers. windows) (if (not (exwm-workspace--workspace-p frame)) (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 (let ((exwm-layout--other-buffer-exclude-exwm-mode-buffers t)) (dolist (window windows) (with-current-buffer (window-buffer window) (when (eq major-mode 'exwm-mode) (switch-to-prev-buffer window)))))) ;; 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 frame exwm--id)) ;; Make sure this buffer is not displayed elsewhere. Note down ;; windows displaying an EXWM-buffer now displayed elsewhere; we ;; need to display with some other buffer there. (setq vacated-windows (append vacated-windows (cdr (get-buffer-window-list (current-buffer) 0 t)))) ;; Note down when an EXWM-buffer is being covered by this ;; buffer; we don't want it to reappear in some vacated window. (let ((prev-buffer (car-safe (car-safe (window-prev-buffers window))))) (and prev-buffer (eq 'exwm-mode (buffer-local-value 'major-mode prev-buffer)) (push prev-buffer covered-buffers)))))))) ;; Set some sensible buffer to vacated windows. (let ((exwm-layout--other-buffer-exclude-buffers covered-buffers)) (dolist (window vacated-windows) (switch-to-prev-buffer window))) ;; Make sure windows floating / on other workspaces are excluded (let ((exwm-layout--other-buffer-exclude-exwm-mode-buffers t)) (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)))) (switch-to-prev-buffer window))))) (exwm-layout--set-client-list-stacking) (xcb:flush exwm--connection)))) (declare-function exwm-workspace--client-p "exwm-workspace.el" (&optional frame)) (defun exwm-layout--on-minibuffer-setup () "Refresh layout when minibuffer grows." (unless (exwm-workspace--client-p) (exwm--defer 0 (lambda () (when (< 1 (window-height (minibuffer-window))) (exwm-layout--refresh)))))) (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) (not (exwm-workspace--client-p)) (or (cl-position ?\n (current-message)) (> (length (current-message)) (frame-width exwm-workspace--current)))) (if dirty (exwm-layout--refresh) (exwm--defer 0 #'exwm-layout--refresh)))) ;;;###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 (and width (> width 0)) (setf (slot-value exwm--geometry 'width) 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 (and height (> height 0)) (setf (slot-value exwm--geometry 'height) 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) (call-interactively #'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)))) (defvar exwm-layout--timer nil "Timer used to track echo area changes.") (defun exwm-layout--init () "Initialize layout module." ;; Auto refresh layout (add-hook 'window-configuration-change-hook #'exwm-layout--refresh) ;; The behavior of `window-configuration-change-hook' will be changed. (when (fboundp 'window-pixel-width-before-size-change) (add-hook 'window-size-change-functions #'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) (setq exwm-layout--timer (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))) (defun exwm-layout--exit () "Exit the layout module." (remove-hook 'window-configuration-change-hook #'exwm-layout--refresh) (remove-hook 'minibuffer-setup-hook #'exwm-layout--on-minibuffer-setup) (when exwm-layout--timer (cancel-timer exwm-layout--timer) (setq exwm-layout--timer nil)) (remove-hook 'echo-area-clear-hook #'exwm-layout--on-echo-area-change)) (provide 'exwm-layout) ;;; exwm-layout.el ends here