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2010-04-19
, 13:26
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Posts: 11 |
Thanked: 8 times |
Joined on Mar 2010
@ Sabah, Malaysia
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#2
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Replying to myself here 
I found that xprop can be used to enumerate all windows in an X11 session and retrieve the top-most (focused) window.
For the technically-inclined, I have uploaded some scripts for your reference/use.
This method requires installation of x11-utils from the Maemo Fremantle/Tools repository. The instructions can be found here: http://talk.maemo.org/showthread.php...731#post448731.
After installing x11-utils, xprop will be available on the console.
The uploaded files consist of:
Usage: x11-wait-for-topmost.sh [WM_CLASS] [EVENT] [TIMEOUT]
Example:
I found that xprop can be used to enumerate all windows in an X11 session and retrieve the top-most (focused) window.
For the technically-inclined, I have uploaded some scripts for your reference/use.
This method requires installation of x11-utils from the Maemo Fremantle/Tools repository. The instructions can be found here: http://talk.maemo.org/showthread.php...731#post448731.
After installing x11-utils, xprop will be available on the console.
The uploaded files consist of:
- x11-wait-for-topmost.sh
- x11-xprop-get-topmost.sh (x11-wait-for-topmost.sh depends on this file)
Usage: x11-wait-for-topmost.sh [WM_CLASS] [EVENT] [TIMEOUT]
- WM_CLASS is the class name of the window you are targeting e.g. osso-xterm, camera-ui;
- (optional) EVENT is the type of event you are looking for: focus or blur - focus simply means that the window has become top-most, and blur meaning that the targeted window is no longer top-most (defaults to focus);
- (optional) TIMEOUT is the number of seconds before exiting if the focus/blur event on the target windows has not occurred (defaults to 600 seconds i.e. 10 minutes)
Example:
Code:
./x11-wait-for-topmost.sh camera-ui ./x11-wait-for-topmost.sh camera-ui focus
Both of these commands do the same thing, the script will wait until the camera application runs and receives the focus (try opening the camera slide).Notes:
- The script will print the text event-triggered to stdout when it is successful. You can easily use another script to capture and test for this output.
- x11-xprop-get-topmost.sh is the file that actually calls xprop. If you want to see the bare-bones xprop calls, you will find it inside this file.
- Both files are designed to be reusable in your own scripts. They also come with some sanity checks built-in e.g. x11-xprop-get-topmost.sh actually checks first if you have xprop installed.
- You do not have to be root to run either script.
I'm writing a simple shell script that needs the user to go to the camera, take a picture, and manually return to xterminal (which is already open previously).
My question: Is there any way I can detect which application currently has the focus from a shell script? Or the reverse: Is there any way that I can check whether an application has been "backgrounded"?
Alternatively, rather than using a "pure" shell script, is there any simple python implementation of the above? In this case I can call the python interpreter to check the application state from the shell script and process accordingly.
Thanks