mouse location woes

kelvin

Member

Posts: 469
Joined: 2002.10

Post: #1

Nov 29, 2002 — 09:48 PM

In Cocoa I used

Code:

newMode = CGDisplayBestModeForParameters(kCGDirectMainDisplay, 24, width, height, 0);

CGDisplaySwitchToMode(kCGDirectMainDisplay, newMode);

to change to a full screen context.

How do I get the mouse location on the screen?
When I do:

Code:

NSPoint mouseLoc = [NSEvent mouseLocation];

I get a Point that is x pixels too high, where x is the old screen height - the new screen height + 1. (289 in my case 768-480+1)

Does anyone know a fix or another way to get the mouse location?
(I don't have a nsview or nswindow btw, as I am drawing direct to the screen.)

---Kelvin--
15.4" MacBook Pro revA
1.83GHz/2GB/250GB

geezusfreeek

Member

Posts: 201
Joined: 2002.06

Post: #2

Nov 29, 2002 — 09:54 PM

I don't know what the problem is with the way you're doing it, but, just in case this may work for your purposes, this returns the mouse position change associated with the last mouse move event received by this application.

Code:

void CGGetLastMouseDelta(

    CGMouseDelta * deltaX,

    CGMouseDelta * deltaY );

blb

Unregistered

Post: #3

Nov 29, 2002 — 10:14 PM

I'd love to find a cleaner way than:

Code:

NSPoint mouseLoc;

Point carbonPoint;

GetMouse( &carbonPoint );

mouseLoc.x = carbonPoint.h;

mouseLoc.y = [ self bounds ].size.height - carbonPoint.v;

but when in full screen, this is the best I've found. Of course, if you just need deltas, geezusfreeek's method is the way to go.

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #4

Nov 29, 2002 — 10:54 PM

I seem to recall that there's a bug in the communication between CGDirectDisplay and NSScreen. I think there's a (hack) fix which involves playing directly with NSScreen's internals.

Personally, if I was already using CG for full-screen, I'd probably be tempted to use CG to get the mouse movement, as others have suggested. Just store the mouse's current position, and manually update it by calling CGGetLastMouseDelta or whatever it's called when you receive a mouse moved event.

wally

Unregistered

Post: #5

Dec 6, 2002 — 05:50 PM

Quote:Originally posted by OneSadCookie
I seem to recall that there's a bug in the communication between CGDirectDisplay and NSScreen. I think there's a (hack) fix which involves playing directly with NSScreen's internals.

And here's the hack (from SDL)

Code:

/* 

    Add methods to get at private members of NSScreen. 

    Since there is a bug in Apple's screen switching code

    that does not update this variable when switching

    to fullscreen, we'll set it manually (but only for the

    main screen).

*/

@interface NSScreen (NSScreenAccess)

- (void) setFrame:(NSRect)frame;

@end

@implementation NSScreen (NSScreenAccess)

- (void) setFrame:(NSRect)frame;

{

    _frame = frame;

}

@end

Now, when you set the new resolution, use this:

Code:

NSRect screen_rect = NSMakeRect(0,0,width,height);

[ [ NSScreen mainScreen ] setFrame:screen_rect ];

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