i3 FAQ - Individual question feed

i3 FAQ - Individual question feedhttps://faq.i3wm.org/questions/Frequently asked questions and answers about the i3 window managerenCopyright i3, 2012Thu, 11 Sep 2014 07:08:36 +0000How do I automatically send SIGSTOP to workspace apps when switching away from a workspace?https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/I read somewhere in i3bar documentation or code or whatnot that it automatically sends SIGSTOP to i3status when in hidden mode. I think that's wonderful and would like to have the same thing for some background Wine apps that hammer the CPU when I don't need them to (hello Picasa 3). So when I switch away from workspace 4, SIGSTOP should be sent to x+1 processes. When I switch back to workspace 4, SIGCONT is sent sent to x+1 processes. Any suggestions?Thu, 22 Aug 2013 09:12:31 +0000https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/Comment by Michael for I read somewhere in i3bar documentation or code or whatnot that it automatically sends SIGSTOP to i3status when in hidden mode. I think that's wonderful and would like to have the same thing for some background Wine apps that hammer the CPU when I don't need them to (hello Picasa 3). So when I switch away from workspace 4, SIGSTOP should be sent to x+1 processes. When I switch back to workspace 4, SIGCONT is sent sent to x+1 processes. Any suggestions? https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/?comment=2434#comment-2434I know that endre and Merovius from #i3 have scripts to do this for firefox.Tue, 27 Aug 2013 06:53:57 +0000https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/?comment=2434#comment-2434Answer by f8l for I read somewhere in i3bar documentation or code or whatnot that it automatically sends SIGSTOP to i3status when in hidden mode. I think that's wonderful and would like to have the same thing for some background Wine apps that hammer the CPU when I don't need them to (hello Picasa 3). So when I switch away from workspace 4, SIGSTOP should be sent to x+1 processes. When I switch back to workspace 4, SIGCONT is sent sent to x+1 processes. Any suggestions? https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/?answer=4620#post-id-4620You can subscribe to `workspace` event with [IPC](http://i3wm.org/docs/ipc.html#_workspace_event). Whenever you catch the `workspace focus` event do the following: 1. Remember the `id` of old workspace. 2. Send [GET_TREE](http://i3wm.org/docs/ipc.html#_sending_messages_to_i3). 3. For each container in old workspace: 1. Get the container's client X11 window ID (`window` in the [TREE](http://i3wm.org/docs/ipc.html#_tree_reply) reply). 2. Query the `_NET_WM_PID` with `xprop`. 3. Send SIGSTOP to that pid. This is a simplified algorithm which doesn't take setups with multiple monitors into account, but I think an additional check against [WORKSPACES reply](http://i3wm.org/docs/ipc.html#_workspaces_reply) will do the trick. Of course you'll have to send SIGCONT to windows on current workspace analogously.Wed, 10 Sep 2014 22:12:54 +0000https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/?answer=4620#post-id-4620Comment by lkraav for You can subscribe to <code>workspace</code> event with <a href="http://i3wm.org/docs/ipc.html#_workspace_event">IPC</a>. Whenever you catch the <code>workspace focus</code> event do the following: <ol> <li>Remember the <code>id</code> of old workspace.</li> <li>Send <a href="http://i3wm.org/docs/ipc.html#_sending_messages_to_i3">GET_TREE</a>.</li> <li>For each container in old workspace: <ol> <li>Get the container's client X11 window ID (<code>window</code> in the <a href="http://i3wm.org/docs/ipc.html#_tree_reply">TREE</a> reply).</li> <li>Query the <code>_NET_WM_PID</code> with <code>xprop</code>.</li> <li>Send SIGSTOP to that pid.</li> </ol></li> </ol> This is a simplified algorithm which doesn't take setups with multiple monitors into account, but I think an additional check against <a href="http://i3wm.org/docs/ipc.html#_workspaces_reply">WORKSPACES reply</a> will do the trick. Of course you'll have to send SIGCONT to windows on current workspace analogously. https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/?comment=4623#comment-4623Looks plausible, thanks!Thu, 11 Sep 2014 07:08:36 +0000https://faq.i3wm.org/question/2410/how-do-i-automatically-send-sigstop-to-workspace-apps-when-switching-away-from-a-workspace/?comment=4623#comment-4623