Hi,

Is there any (more or less) reliable way to detect the size of the desktop (that is: on the active screen, the space a form can occupy so that it will take in account the presence of a taskbar etc.)

I need something like this to keep a form that I create at runtime in view on the desktop (it's initial size and widht/height) depend on the contents it must display).

I know how to do it on Windows.
Linux (GTK2) and MAC would be nice.

Bart

GetMonitorInfo(), GetSystemMetrics() SM_CXSCREEN,
SM_CYSCREEN,SM_CXVIRTUALSCREEN,SM_CYVIRTUALSCREEN doesn't help ?

31.03.2011 7:06, Bart ?????:

Is there any (more or less) reliable way to detect the size of the desktop (that is: on the active screen, the space a form can occupy so that it will take in account the presence of a taskbar etc.)

..

I know how to do it on Windows. Linux (GTK2) and MAC would be nice.

TScreen.Monitors[i].WorkareaRect

Best regards,
Paul Ishenin

zeljko wrote

GetMonitorInfo(), GetSystemMetrics() SM_CXSCREEN, SM_CYSCREEN,SM_CXVIRTUALSCREEN,SM_CYVIRTUALSCREEN doesn't help ?

On Windows GetSystemMetrics does return the size the (virtual) desktop has, but it does not subtract the space occupied by the Windows TaskBar (see: http://msdn.microsoft.com/en-us/library/ms724385(v=vs.85).aspx). You have to use SystemparametersInfo(SPI_GETWORKAREA, 0, @WorkArea, 0 ); with WorkArea being of type TRect;

Bart

Paul Ishenin wrote

TScreen.Monitors[i].WorkareaRect

I'll take a look.

Bart

Paul Ishenin wrote

TScreen.Monitors[i].WorkareaRect

This seems to work for Win and Linux/GTK2.

This raises yet another question though.
How do I know on which monitor my form is?
(I only have one monitor, so I cannot test this)

Bart

What about this:

Screen.MonitorFromWindow(YourForm.Handle);

It returns a TMonitor.

Regards,
Sven

Note that each monitor has it's own set of coordinates, which may be negative.

eg 2 monitor left to right may be

m1 TopRight x: -1200, y:0
m2 TopRight x: 0, y:0

2011/3/31 Sven Barth :

Maybe a little OT, but is it possible to change screen resolution (e.g. on a native 19200x1200 set 800x600) in a crossplatform way? I need this for fullscreen apps (opengl in first).

Thanks!
Kjow

I'm not really confident in this, but I believe if you tell OpenGL to be fullscreen in that or that resolution it will switch to that automatically.

Regards,
Sven

Thanks.

Bart

I'm not really confident in this, but I believe if you tell OpenGL to be fullscreen in that or that resolution it will switch to that automatically.

No, it does not, because you don't give such information to OpenGL. Resolution switching or making windows fullscreen is not the task of OpenGL.

R.

Bart wrote

On 3/31/11, Paul Ishenin wrote: > TScreen.Monitors[i].WorkareaRect This seems to work for Win and Linux/GTK2.

This was tested on OSX during the development too.

This raises yet another question though. How do I know on which monitor my form is? (I only have one monitor, so I cannot test this)

Looks like search does not work on your PC anymore.

property.

Best regards,
Paul Ishenin

Paul Ishenin wrote

This was tested on OSX during the development too.

Nice.

Looks like search does not work on your PC anymore.

(Well, it is slow on my 10 year old machine, but is still works most of the time.
I also searched the forum and wiki.)

property.

Well, I did just that, but I just couldn't figure it out. I finally used something like
Screen.MonitorFromPoint(ClientToSCreen(Self.BoundsRect.TopLeft)) to get the monitor the form was currently on...

Just thougth to ask if someone had a simpler solution ;-)

Thanks to all for the help.

Bart

2011/4/1 Hans-Peter Diettrich :

Yes, some 3D apps need to make compromises to have better performances instead of best quality. :)

Kjow

Maybe a little OT, but is it possible to change screen resolution (e.g. on a native 19200x1200 set 800x600) in a crossplatform way? I need this for fullscreen apps (opengl in first).

Are you sure that you want to use an digital monitor (TFT...) in anything but its native resolution? CRTs can be configured to a wide range of resolutions, but nowadays flatscreens, with addressable pixels, require soft-/hardware interpolation when abused for a different resolution.

DoDi

A form/window actually can span multiple monitors.

DoDi

Yes, and TForm.Monitor returns one where the biggest part of the form is located.

Best regards,
Paul Ishenin