Detecting if WPF application is visible on screen

Hi gents, I have made an WPF application that reads data from an external device using the serial port and then visualizes it. Now, I would like to avoid reading data from the serial port when the application is not visible on the screen, thus there is no
need to read data which is time consuming. So can someone please advice on how to check if the application (mainWindow) is visible or not. I have tried to make use of events such as isActive, isVisible etc. but none of the ones I tried work. I will be happy
with a solution where the application is recognized as visible if just a pixel of it is visible on the screen.
Best Regards
Tom

A window doesn't need to have focus or be "active" to be in view.
That means Magnus approach is only going to work if you want it to function only whilst the user gives it focus.
For example.
I have 5 windows open and parts of 3 of them visible at the moment.
Two are not minimised but are behind others.
IPlayer doesn't have focus and I'm listening to radio 2.
This is somewhat easier if your user will only have one monitor.
Please take a look at the following thread:
http://stackoverflow.com/questions/2465646/how-do-i-know-what-monitor-a-wpf-window-is-in
bool onPrimary = this.Bounds.IntersectsWith(Screen.PrimaryScreen.Bounds);
If all you're trying to save is processing then handling statechanged for minimize and switch might be something to consider.
This is non trivial though:
http://stackoverflow.com/questions/926758/window-statechanging-event-in-wpf
Hope that helps.
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Perhaps the title should be "Multiple Screens with multiple video cards." I imagine my confusion here is the reason I am unable to move clients from one screen to the other in awesome. Though the cursor moves fluidly between Screen1 and 2, MOD4+drag traps the cursor and the client on the current screen. MOD4+o brings the cursor to the upper left corner of the current screen. Openbox and fluxbox are similarly limited.
With my Xorg.conf I have $DISPLAY as :0.0 or :0.1 depending on which screen the terminal is open.
The closest I've come to a solution is xpra from the parti-all aur package. But, I haven't found a way to make it useful. I'm hoping there is an alternative configuration. Maybe something like xinerama or Zaphod?
I'd like to use xrandr but it seems thats a no go for multiple boards as of the the previous version. I cannot find documentation for 1.3.
http://wiki.debian.org/XStrikeForce/HowToRandR12 wrote:VI.5. Multi-board support broken - RandR 1.2 does not support multiple boards yet (it's planned for RandR 1.3). It means that any RandR 1.2 aware driver will crash the server if you have 2 boards. Even one board with a RandR 1.2 driver and another board with a classic driver does not work. It just crashes the X server.
Any ideas?
> grep -v "^\s*#" /etc/X11/xorg.conf|grep -v ^$ |xclip wrote:Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/Type1"
EndSection
Section "Module"
Load "glx"
Load "dri2"
Load "extmod"
Load "dbe"
Load "dri"
Load "record"
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Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option    "Protocol" "auto"
Option    "Device" "/dev/input/mice"
Option    "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
Section "Device"
Identifier "Card0"
Driver "nv"
VendorName "nVidia Corporation"
BoardName "NV25 [GeForce4 Ti 4200]"
BusID "PCI:3:0:0"
EndSection
Section "Device"
Identifier "Card1"
Driver "radeon"
VendorName "ATI Technologies Inc"
BoardName "Radeon RV100 QY [Radeon 7000/VE]"
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Section "Screen"
Identifier "Screen0"
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Depth 1
EndSubSection
SubSection "Display"
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Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Card1"
Monitor "Monitor1"
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Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
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SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Err. My confusion is indeed the culprit. For anyone who might find themselves in a similar situation the nomenclature is as follows.
"Zaphod mode" on wikipedia is listed as a multi-seat configuration, however, I think it more often describes the set up in my posted xorg.conf. That is, the server has two independent screens associated with their respective device. Titling window managers seem to present multiple screens a la Zaphod. At least in awesome, each screen has its own set of tags. Xinerama is a soon to be deprecated extension merging multiple physical displays into a singular virtual one. It will be replaced with RandR. But, as of the current version of RandR, multi-board setups are not supported.
ATI and nVidia have proprietary implementations for multi-head configurations (Big Desktop and Twinview respectively). I assumed both cards would have to be same brand and either ATI or nv. So, I didn't look into this.
By the nature of Zaphod mode, applications exist only on one screen. They cannot easily be moved. Because the Xinerama extension implements one large virtual display, X clients can be displayed anywhere. This is apparently at the cost of direct rendering on both screens. Xinerama is also limited in that all screens have to have the same depth.
Having the Zaphod mode xorg config, enabling Xinerama just requires one line in the ServerLayout section:
Section "ServerLayout"
Option "Xinerama" "on"
However, if the resolution differs on the screens, screens with lower resolutions will have "dead space" where the rectangle of the virtual resolution is not displayed by the physical resolution of a screen. Moving the cursor into this area will pan the screen to show the previously hidden area and hiding what was previously visible. This means an application fullscreened on the screen with the lower resolution will never be completely visible.
To enforce physical resolutions in the virtual screen also only requires one line. In the display subsection of the lower resolution screen section, setting the virtual display to the same as the mode will remove the dead area.
Section "Screen"
Identifier "Screen1"
SubSection "Display"
Modes "1280x1024"
Virtual 1280 1024
EndSubSection
Please reply if I've gotten anything wrong!
Last edited by _will (2009-10-07 22:08:19)

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Hi Everyone,
I am trying to build a VB.NET WPF application using Measurement Studio 2013 for Visual Studio 2012.
I followed the walktrough Creating a measurement studio NIDAQmx application, but I get stuck at the point of creating the project as Visual studio does not offer me the possibility to create an NIDaq Windows application.
I have DAQmx9.8 installed for LabVIEW, I downloaded NI device Drivers 2014 feb, but still the same.
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Attachments:
WPF_Daqmx.PNG ‏51 KB
installedSoftware.PNG ‏21 KB

Hi Matt,
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Although it is working now on some of my configurations at least.
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http://forums.ni.com/t5/Measurement-Studio-for-NET/Web-publishing-daq-application/m-p/2830642
http://forums.ni.com/t5/Measurement-Studio-for-NET/WriteDigitalChannel-example-nothing-in-NI-IO-trac...
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I created an application and in that application if date is changed the application starts from splash screen on re-entering and if date is not changed and u re-enters the application then it open in page where u leaved.It works fine in our side (Timezone,kolkata ,india even for Timezone,slvaniya,USA) but our USA client is telling that on changing the date it not starts from start-up sequence.Can anyone plz suggest the reason for it.

This is the code which we have used.
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Please Suggest..

I created an application and in that application if date is changed the application starts from splash screen on re-entering and if date is not changed and u re-enters the application then it open in page where u leaved.It works with iPod not with iPhone

I created an application and in that application if date is changed the application starts from splash screen on re-entering and if date is not changed and u re-enters the application then it open in page where u leaved.It works with iPod not with iPhone

Try posting in the developer forums to see if you can get some assistance,you'll have to be a registered developer for access though.
developer.apple.com

Detecting if WPF application is visible on screen

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