Keyboard event

SDL Development
1

Hello,

how can I easily (one line, if possible) make the following test :

a shift key (left or right) is pressed, OR Capslock is locked, but not both.

thanks.

2

ps : I don’t want other keys to interfere with the results (such as num lock for instance).

3

is the question about how to make the IF statement, or how to get the actual
modifiers?

You can always track state of num lock/caps lock and include that in the IF
statement.

JohnOn Thu, May 6, 2010 at 3:24 AM, Lilly wrote:

ps : I don’t want other keys to interfere with the results (such as num
lock for instance).

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4

both, I guess. I would just like a statement that works.
I’ve tried this, but it doesn’t work :
if (((event.key.keysym.mod & KMOD_SHIFT) & SDLK_CAPSLOCK) == (KMOD_SHIFT & SDLK_CAPSLOCK))

5

It doesn’t look right that you’re mixing KMOD and SDLK with only
event.key.keysym.mod.
Try something like:
if((event.key.keysym.mod & (KMOD_SHIFT | KMOD_CAPS)) == KMOD_SHIFT
|| (event.key.keysym.mod & (KMOD_SHIFT | KMOD_CAPS)) == KMOD_CAPS)

Jonny DOn Thu, May 6, 2010 at 8:24 AM, Lilly wrote:

both, I guess. I would just like a statement that works.
I’ve tried this, but it doesn’t work :
if (((event.key.keysym.mod & KMOD_SHIFT) & SDLK_CAPSLOCK) == (KMOD_SHIFT &
SDLK_CAPSLOCK))

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6

SDLK_CAPSLOCK is not bitwise, it’s an enum that is 12D in hex. Therefore

KMOD_SHIFT & SDLK_CAPSLOCK evaluates to 1.

Hence your statement is equivalent to
if (event.key.keysym.mod & KMOD_SHIFT == 1).

Somehow I doubt that’s what you wanted.

HTH,
JeffOn Thursday 06 May 2010 08:24, Lilly wrote:

both, I guess. I would just like a statement that works.
I’ve tried this, but it doesn’t work :
if (((event.key.keysym.mod & KMOD_SHIFT) & SDLK_CAPSLOCK) == (KMOD_SHIFT &
SDLK_CAPSLOCK))

7

Try SDL_GetKeyState() ( http://www.libsdl.org/cgi/docwiki.cgi/SDL_GetKeyState ).On 5 May 2010 01:38, Lilly wrote:

Hello,

how can I easily (one line, if possible) make the following test :

a shift key (left or right) is pressed, OR Capslock is locked, but not both.

8

Jonny D, thanks for trying, but your proposition doesn’t work when shift is pressed.

Jeff Post, what do you suggest to make my if statement then ?

9

make that SDL_GetModState():

int mod = SDL_GetModState(); // or use event.key.keysym.mod
if (((mod & KMOD_SHIFT) != 0) ^ ((mod & KMOD_CAPS) != 0)) {
// do stuff…
}On 6 May 2010 13:00, Kenneth Bull <@Kenneth_Bull> wrote:

Try SDL_GetKeyState() ( http://www.libsdl.org/cgi/docwiki.cgi/SDL_GetKeyState ).

10

Okay, then it’s a trivial change. Have you studied C bitwise operators?
You should be able to use Ken’s expression in your test anyhow. I like it
better.

Jonny DOn Thu, May 6, 2010 at 10:00 AM, Lilly wrote:

Jonny D, thanks for trying, but your proposition doesn’t work when shift
is pressed.

Jeff Post, what do you suggest to make my if statement then ?

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11

thanks, problem solved.