Imgui: Separating/flagging SDLK_ codes with high bit set (1<<30) from standard keys

[inflex]

On linux, in C++.

I have a situation where I cannot differentiate between (0x40000063) SDLK_KP_PERIOD (or rather SDLK_SCANCODE_KP_0) and SDLK_c (0x63) using ImGui::IsKeyPressed() because the upper bit is well outside of the normal 512 entry limits of the KeyDown[] array.

So when I press the numeric-pad del/. key, my ImGui program responds as if I pressed the 'c' key as well.

Any recommendations on a path to chase with this?

[ratchetfreak]

You can make some special code to handle those keys and remap them in an available range. For example:

if(0x4000000 & key) key |= 0x100;
key &= 0x1ff;

[inflex]

What I should have asked, before my reaction, is "Where would be the most appropriate place to insert such code" ?

[ratchetfreak]

Where you fill out the keysDown array. This is essentially remapping the range of 0x40000** to 0x1**

[inflex]

okay, thanks. That's going to be the fun part, because either this application is using a default/built-in to populate the keysDown array, or I'm completely missing it.

Thanks for your help, appreciated.

[ocornut]

Have you looked at what the SDL example does?
I think it's using the other sets of SDL defines.

Otherwise you can just set KeysMap[] to be an identity array (index=value), and then set the KeysDown[] array accordingly. You don't need to use the SDLK codes as indices into that array.

On 9 Jul 2016, at 21:49, Inflex [email protected] wrote:

okay, thanks. That's going to be the fun part, because either this application is using a default/built-in to populate the keysDown array, or I'm completely missing it.

Thanks for your help, appreciated.

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[inflex]

Thanks @ocornut , I'll go on a bit of an adventure and see what I can do.

Greatly appreciate all the work you've done to date.

[inflex]

Good news, I found where it was being done and am now on my way :)

//int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; // original code
            int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK;
                if (event->key.keysym.sym  & (1<<30)) {
                    fprintf(stderr,"SDL Highbit remask %x -> %x\n", event->key.keysym.sym, key);
                    key |= 0x100;
                }