I have an application that runs on a Raspberry Pi with Linux Mate and a touch screen. The normal users control the application via touch screen and should usually only see my application. I have defined a keyboard shortcut in Mate that allows me to toggle the fullscreen mode which can be used when I am remotely connected to the PI and have a keyboard.
From time to time it is, however, necessary for the normal user to access the desktop. Since the Raspberry Pi has no keyboard connected, the (local) user can't use the keyboard shortcut.
For this reason I would like to add a button to my application that would allow the user to toggle fullscreen mode.
As far as I understand this is a function of the Gnome 2 desktop (which Linux Mate uses). I have no idea how to access this from my program and can't find any information on it.
My application is written in .NET Core with Avalonia UI but the function would not necessarily have to be integrated in my application. I could as well call an external script or utility program.
Any idea how to accomplish this?
A friend gave me the tip to check out the wmctrl program. The sources of this program led me to the XLib or XCB library and setting the window to _NET_WM_STATE_FULLSCREEN.
I guess this could be done in .NET by P/Invoking the native lib. Then again it seems much easier to write a shell script that determines the windows ID and calls the wmctrl utility and call that script from the .net application.
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Working on a embedded linux device with touch screen. Compiled Qt with eglfs support and using tslib for the touch screen. All good up until here. Now, I need to add a virtual keyboard. I've this keyboard as platforminputcontextplugin which works very well on my development linux machine. How can this be done on the embedded device? eglfs is forcing the top window (main window) to full screen and the keyboard is struck behind this window.
What are the options available to me? we need eglfs as it supports OpenGL ES which in turn used by Qt Quick (QML).
I want to write an application for Windows which displays its GUI on a Linux machine.
My idea is to use GTK+, compiler would be MS Visual C++, I know that the gtk libraries are available for Windows, but need a push into the right direction to start.
Will I need some kind of client app on the Linux side as well?
I'm looking for a way to programmatically manipulate a windows program running on Linux under Wine.
Is there something similar on Linux to the Windows SetWindowForeground win32 command?
A function that sets a window by name to the foreground, that will work with a Windows program running under Wine on Linux?
Doe's wine use X11? If so I may be able to utilize this answer, will experiment and circle back
In Linux application windows (including your wine apps window) are managed by your desktop environment's Window Manager (WM). The Window Manager controls how windows are placed and the controls which operate on the windows (resizing, minimize, maxize etc).
Unfortunately there is no standardised Window Manager the major desktop environments (GNOME, KDE etc) have developed their own Window Managers and some people run stand alone WMs like IceWM or more exotic tiling WMs etc.
KDE's WM is called KWin, Gnome's is Mutter, Unity uses Compiz (I think - haven't used Ubuntu for a long time).
When the WM is running in an X sesion it probably uses X11 API internally to raise and lower windows.
However most modern WMs will prevent userpace X calls from popping up windows (because of security concerns etc) You will need to use the WM's wrapper functions. I think Wayland (whenever it is finally available) will have a proper secure API so this shouldn't be an issue.
The short answer to your question is any program you write will likely need to be Windows Manager specific and you should consult the documentation for your WM.
Long Answer - there is a freedesktop.org standard called Extended Windows Manager Hints I'm not sure how good conformance to the spec is among differing WMs (major ones like Gnome and kDE should be good). The property you are interested in is Window State (NET_WM_STATE)
See: http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html
I hope that helps - my knowledge of WMs is probably outdated but should steer you in the right direction - I haven't really played around with WMs since GLX first came out and Compositing (wobbly windows and all that jazz) was in vogue.
You can use X11 window manager xdotool or X window manager wmctrl.
Consider the following scenario. A MS windows application titled WordWeb Installer running in wine on Ubuntu on workspace 2. Current workspace : 1. To switch to workspace 2 and focus the wine app execute
wmctrl -R wordweb or
xdotool windowactivate $( xdotool search --name wordweb )
I'm using cygwin/X-Sever to ssh into several other machines and then open the same control pannels on each machine. Is it possible to color the Top window bar differently for each one? Either using X11 or windows?
Clientside: Win7 - Cygwin
Serverside: Unix & Linux
If you were using Linux as a client, this could be done clientside using a nice window manager like i3 by just applying a different window decoration style based on namespace.
Now because you're using Windows 7 with cygwin, my best guess is that you're using XWin for Xserver. I am not aware of built-in functionality to XWin that would allow you do to this easily client-side. You said you're opening remote "control panels" on each machine, but not if they are GUI or CLI applications.
For CLI applications, you can set the background and foreground colour on a remote xterm session when connecting with startxwin as the Examples section of the man page shows.
For GUI applications, the simplest solution may be to follow what I described in the first paragraph but server-side. Using ssh this would be easy to script, just set a custom window manager theme on the remote host for the application at runtime. Your remote host window manager's documentation should explain how to configure there.
I've just finished the LFS book and my Linux system is working right now. I want to use OpenGL to display graphics on the screen, while the only installed package right now are those described on http://www.linuxfromscratch.org/lfs/view/stable/chapter03/packages.html.
I don't want to install something like Gnome, KDE or X.org. Instead, I want to use OpenGL directly from my software. Is this possible, and how can I do this? Or is it just as easy (I don't think so :'p) as writing an OpenGL application which runs full screen?
You don't have to install Gnome or KDE. These are used to managed windows, and you can launch graphical applications without having a window manager.
Therefore, you'll have to install a X server. The X server is responsible of drawing things on your screen. Without X server, you can't launch graphical applications.
Once X has been installed, launch it, export your DISPLAY environment variable, and the rest is like writing an OpenGL application which runs full screen :-)
You can use Pygame as well to create custom launch UI. Also try looking at Wayland compositor as it has replaced XServer in verisons like Fedora and Ubuntu.
kmscube DRM example
https://github.com/robclark/kmscube
This is possibly the most popular demo available, it uses OpenGL and EGL.
Unfortunately, the Ubuntu 18.04 package with NVIDIA proprietary drivers it does not work for me after going into Ctrl + Alt + F3:
drmModeGetResources failed: Invalid argument
failed to initialize legacy DRM
bug report: https://github.com/robclark/kmscube/issues/12
But I did get it working on emulator.
It takes over the entire display, and shows a colorful spinning cube.