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Weston keyboard shortcuts
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[[Wayland Weston overview|Weston]] is the reference implementation of a Wayland compositor. The table below lists the actions that can be performed through Weston keyboard shortcuts, when the development board is connected to a keyboard. It must be noted that: * '''<modifier-key>''' in the table below corresponds to the key used for common bindings. It is defined by ''binding-modifier=<modifier-key>'' in the ''/etc/xdg/weston/weston.ini'' file. Possible values for <modifier-key> are: ** "super", i.e. Windows key between "ctrl" and "alt" (default Weston value) ** "ctrl" (default value in STMicroelectronics images) ** "alt" ** "none" * The shortcuts are defined in ''desktop-shell/shell.c''<ref>https://cgit.freedesktop.org/wayland/weston/tree/desktop-shell/shell.c Weston Wayland Compositor official git</ref> file (''shell_add_bindings()'' function) * Some shortcuts require that both a keyboard and a mouse are connected to the development board * Some shortcuts require that several workspaces are defined. The number of workspaces is defined by ''num-workspaces=<num-workspaces>'' in the ''/etc/xdg/weston/weston.ini'' file. The maximum number of workspaces is 6. If ''num-workspaces'' is not set, one single workspace is configured. * The left mouse button allows the activation of a window. Before proceeding, it is recommended to * check the <modifier-key> value: {{Board$}} grep binding-modifier /etc/xdg/weston/weston.ini binding-modifier={{Highlight|ctrl}} * check the <num-workspaces> value: {{Board$}} grep num-workspaces /etc/xdg/weston/weston.ini num-workspaces={{Highlight|6}} {| |+ Weston keyboard shortcuts ! Command !! Action !! Condition(s) |- | ctrl + alt + backspace || Kill Weston || Keyboard |- | super + scroll || Zoom in / out the desktop || Keyboard + mouse |- | super + alt + scroll || Change activated window opacity || Keyboard + mouse |- | <modifier-key> + page up / page down || Zoom in / out the desktop || Keyboard |- | <modifier-key> + shift + f || Put activated window fullscreen || Keyboard |- | <modifier-key> + left mouse button || Move activated window || Keyboard + mouse |- | <modifier-key> + middle mouse button || Rotate activated window || Keyboard + mouse |- | <modifier-key> + right mouse button || Resize activated window || Keyboard + mouse |- | <modifier-key> + shift + left mouse button || Resize activated window || Keyboard + mouse |- | <modifier-key> + tab || Switch windows || Keyboard |- | <modifier-key> + k || Kill activated window || Keyboard |- | <modifier-key> + key up / key down || Switch to previous / next workspace || Keyboard + workspaces |- | <modifier-key> + shift + key up / key down || Move activated window to previous / next workspace || Keyboard + workspaces |- | <modifier-key> + F'''n''' || Switch to workspace '''n''' || Keyboard + workspaces |- | super + s || Capture a screenshot (see details below) || Keyboard |- | super + r || Start / stop recording a screencast (see details below) || Keyboard |} Additional shortcuts can be found on internet. ==Capturing a screenshot== # Refer to the table above for the command to be used. # The captured picture (PNG format) is automatically stored in ''/wayland-screenshot-2018-01-06_01-48-19.png''. # Copy the screenshot from the board to the host PC in the <file-path> directory (for example with the ''scp'' command). {{PC$}} scp root@<ip address>:/wayland-screenshot-*.png <file-path>/ Note: a screenshot capture is also named a snapshot or a screen capture. ==Recording a screencast== # Refer to the table above for the command to be used. # The recorded screencast (WCAP format) is automatically stored in ''/capture.wcap''. The WCAP format is a lossless video format specific to Weston (only the frame differences are recorded). # To play the recorded screencast, convert it to a format that can be interpreted by any video player (e.g. VP8). Three steps are required: :* On the board, convert the WCAP file into a YUV file using ''wcap-decode'': {{Board$}} wcap-decode capture.wcap --yuv4mpeg2 > capture.y4m :* Copy the YUV file from the board to the host PC in the <file-path> directory (for example with the ''scp'' command): {{PC$}} scp root@<ip address>:/capture.y4m <file-path>/ :* On the host PC, transcode the YUV file to any other well-known format (e.g. VP8) using ''ffmpeg'': {{PC$}} ffmpeg -i capture.y4m -c:v libvpx -b:v 1M capture.webm :* Optionally, choose a higher bitrate (''-b:v 1M'' means a target bitrate of 1 MBit/s) if a better quality is required. Optionally, use the ''transpose'' parameter when a 90 degree clockwise rotation is needed: {{PC$}} ffmpeg -i capture.y4m -vf transpose=1 -c:v libvpx -b:v 1M capture.webm {{Info| Note that the YUV file size might be huge if the recording is long (see example below).}} Example: * On the board: a 5-second screencast is recorded {{Board$}} wcap-decode capture.wcap --yuv4mpeg2 > capture.y4m wcap file: size 720x1280, 192 frames {{Board$}} ls -l capture.* -rw-r--r-- 1 8246868 Dec 13 14:58 capture.wcap -rw-r--r-- 1 {{Highlight|167821312}} Dec 13 14:59 capture.y4m * On the host PC {{PC$}} scp root@<ip address>:/capture.y4m . {{PC$}} ffmpeg -i capture.y4m -vf transpose=1 -c:v libvpx -b:v 1M capture.webm {{PC$}} ls -l capture.* -rw-r--r-- 1 {{Highlight|104470}} Feb 8 11:01 capture.webm -rw-r--r-- 1 167821312 Feb 8 10:56 capture.y4m References list: <references /> <noinclude> {{PublicationRequestId| 7108 | 2018-04-24 | AnneJ}} [[Category:Wayland Weston]] </noinclude>
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