diff options
| -rw-r--r-- | exwm-systemtray.el | 159 |
1 files changed, 116 insertions, 43 deletions
diff --git a/exwm-systemtray.el b/exwm-systemtray.el index 43b3e1eaef..776aced4c4 100644 --- a/exwm-systemtray.el +++ b/exwm-systemtray.el @@ -67,44 +67,51 @@ You shall use the default value if using auto-hide minibuffer." "Gap between icons." :type 'integer) +(defvar exwm-systemtray--connection nil "The X connection.") + (defvar exwm-systemtray--embedder-window nil "The embedder window.") +(defvar exwm-systemtray--embedder-window-depth nil + "The embedder window's depth.") -(defcustom exwm-systemtray-background-color nil +(defcustom exwm-systemtray-background-color + (if (exwm-systemtray--transparency-supported-p) + "black" + 'transparent) "Background color of systemtray. - -This should be a color, or nil for transparent background." - :type '(choice (const :tag "Transparent" nil) +This should be a color, the symbol `workspace-background' for the background +color of current workspace frame, or the symbol `transparent' for transparent +background. + +Transparent background is not yet supported when Emacs uses 32-bit depth +visual, as reported by `x-display-planes'. The X resource \"Emacs.visualClass: +TrueColor-24\" can be used to force Emacs to use 24-bit depth." + :type '(choice (const :tag "Transparent" 'transparent) (color)) :initialize #'custom-initialize-default :set (lambda (symbol value) + (when (and (eq value 'transparent) + (not (exwm-systemtray--transparency-supported-p))) + (display-warning 'exwm-systemtray + "Transparent background is not supported yet when \ +using 32-bit depth. Using black instead.") + (setq value "black")) (set-default symbol value) - ;; Change the background color for embedder. - (when (and exwm--connection + (when (and exwm-systemtray--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))))) + ;; Change the background color for embedder. + (exwm-systemtray--set-background-color) + ;; Unmap & map to take effect immediately. + (xcb:+request exwm-systemtray--connection + (make-instance 'xcb:UnmapWindow + :window exwm-systemtray--embedder-window)) + (xcb:+request exwm-systemtray--connection + (make-instance 'xcb:MapWindow + :window exwm-systemtray--embedder-window)) + (xcb:flush exwm-systemtray--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 @@ -249,6 +256,61 @@ This should be a color, or nil for transparent background." :window exwm-systemtray--embedder-window)))) (xcb:flush exwm-systemtray--connection)) +(defun exwm-systemtray--set-background-color () + "Change the background color of the embedder. +The color is set according to `exwm-systemtray-background-color'. + +Note that this function does not change the current contents of the embedder +window; unmap & map are necessary for the background color to take effect." + (when (and exwm-systemtray--connection + exwm-systemtray--embedder-window) + (let* ((color (cl-case exwm-systemtray-background-color + ((transparent nil) ; nil means transparent as well + (if (exwm-systemtray--transparency-supported-p) + nil + (message "%s" "[EXWM] system tray does not support transparent background; using black instead") + "black")) + (t exwm-systemtray-background-color))) + (background-pixel (exwm--color->pixel color))) + (xcb:+request exwm-systemtray--connection + (make-instance 'xcb:ChangeWindowAttributes + :window exwm-systemtray--embedder-window + ;; Either-or. A `background-pixel' of nil + ;; means simulate transparency. We use + ;; `xcb:CW:BackPixmap' together with + ;; `xcb:BackPixmap:ParentRelative' do that, + ;; but this only works when the parent + ;; window's visual (Emacs') has the same + ;; visual depth. + :value-mask (if background-pixel + xcb:CW:BackPixel + xcb:CW:BackPixmap) + ;; Due to the :value-mask above, + ;; :background-pixmap only takes effect when + ;; `transparent' is requested and supported + ;; (visual depth of Emacs and of system tray + ;; are equal). Setting + ;; `xcb:BackPixmap:ParentRelative' when + ;; that's not the case would produce an + ;; `xcb:Match' error. + :background-pixmap xcb:BackPixmap:ParentRelative + :background-pixel background-pixel))))) + +(defun exwm-systemtray--transparency-supported-p () + "Check whether transparent background is supported. +EXWM system tray supports transparency when the visual depth of the system tray +window matches that of Emacs. The visual depth of the system tray window is the +default visual depth of the display. + +Sections \"Visual and background pixmap handling\" and +\"_NET_SYSTEM_TRAY_VISUAL\" of the System Tray Protocol Specification +\(https://specifications.freedesktop.org/systemtray-spec/systemtray-spec-latest.html#visuals) +indicate how to support actual transparency." + (let ((planes (x-display-planes))) + (if exwm-systemtray--embedder-window-depth + (= planes exwm-systemtray--embedder-window-depth) + (<= planes 24)))) + (defun exwm-systemtray--on-DestroyNotify (data _synthetic) "Unembed icons on DestroyNotify." (exwm--log) @@ -469,8 +531,7 @@ This should be a color, or nil for transparent background." :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) + frame parent embedder-depth embedder-visual embedder-colormap y) (setq exwm-systemtray--embedder-window id) (if (exwm-workspace--minibuffer-own-frame-p) (setq frame exwm-workspace--minibuffer @@ -487,15 +548,21 @@ This should be a color, or nil for transparent background." 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)) + (setq parent (string-to-number (frame-parameter frame 'window-id))) + ;; Use default depth, visual and colormap (from root window), instead of + ;; Emacs frame's. See Section "Visual and background pixmap handling" in + ;; "System Tray Protocol Specification 0.3". + (let* ((vdc (exwm--get-visual-depth-colormap exwm-systemtray--connection + exwm--root))) + (setq embedder-visual (car vdc)) + (setq embedder-depth (cadr vdc)) + (setq embedder-colormap (caddr vdc))) + ;; Note down the embedder window's depth. It will be used to check whether + ;; we can use xcb:BackPixmap:ParentRelative to emulate transparency. + (setq exwm-systemtray--embedder-window-depth embedder-depth) (xcb:+request exwm-systemtray--connection (make-instance 'xcb:CreateWindow - :depth depth + :depth embedder-depth :wid id :parent parent :x 0 @@ -504,19 +571,24 @@ This should be a color, or nil for transparent background." :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) + :visual embedder-visual + :colormap embedder-colormap + :value-mask (logior xcb:CW:BorderPixel + xcb:CW:Colormap xcb:CW:EventMask) - :background-pixmap xcb:BackPixmap:ParentRelative - :background-pixel background-pixel + :border-pixel 0 :event-mask xcb:EventMask:SubstructureNotify)) + (exwm-systemtray--set-background-color) ;; 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"))) + :data "EXWM: exwm-systemtray--embedder-window")) + ;; Set _NET_SYSTEM_TRAY_VISUAL. + (xcb:+request exwm-systemtray--connection + (make-instance 'xcb:xembed:set-_NET_SYSTEM_TRAY_VISUAL + :window exwm-systemtray--selection-owner-window + :data embedder-visual))) (xcb:flush exwm-systemtray--connection) ;; Attach event listeners. (xcb:+event exwm-systemtray--connection 'xcb:DestroyNotify @@ -564,7 +636,8 @@ This should be a color, or nil for transparent background." (setq exwm-systemtray--connection nil exwm-systemtray--list nil exwm-systemtray--selection-owner-window nil - exwm-systemtray--embedder-window nil) + exwm-systemtray--embedder-window nil + exwm-systemtray--embedder-window-depth nil) (remove-hook 'exwm-workspace-switch-hook #'exwm-systemtray--on-workspace-switch) (remove-hook 'exwm-workspace--update-workareas-hook |