Trying to add keystroke to clear shift states, redraw screen \ VOGONS

Trying to add keystroke to clear shift states, redraw screen

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First post, by emendelson

Posted on 2017-02-01, 16:45

emendelson Offline

Rank Oldbie

Rank: Oldbie
Posts: 854
Joined: 2010-02-14, 02:00

A few years ago, with the help of experts on this forum, I added a couple of features to my project. They were designed to do two things: clear the keyboard shift states in case capslock or numlock got stuck, and also redraw the screen. They used to work a few years ago, but when I tried to include them in my current project, they seem to have no effect.

I'm almost certainly making a beginner's mistake, but I'm too much of a beginner to figure out what might be going wrong.

Here is the code, which I add to sdl_mapper.cpp:

1static void ClearShiftStates(bool pressed) {
2 if (!pressed)
3 return;
4 KEYBOARD_AddKey(KBD_leftalt, false);
5 KEYBOARD_AddKey(KBD_rightalt, false);
6 KEYBOARD_AddKey(KBD_leftctrl, false);
7 KEYBOARD_AddKey(KBD_rightctrl, false);
8 KEYBOARD_AddKey(KBD_leftshift, false);
9 KEYBOARD_AddKey(KBD_rightshift, false);
10 // KEYBOARD_AddKey(KBD_capslock, false); // No - this turns on CapsLock if off
11}
12
13static void FixKeyboardScreen(bool pressed) {
14 if (!pressed)
15 return;
16 // Next two functions will clear keyboard buffer
17 KEYBOARD_ClrBuffer();
18 GFX_LosingFocus();
19 int cursor = SDL_ShowCursor(SDL_QUERY);
20 SDL_SetPalette(mapper.surface, SDL_LOGPAL|SDL_PHYSPAL, map_pal, 0, 5);
21 SDL_ShowCursor(cursor);
22 GFX_ResetScreen();
23 // next clears shift states
24 KEYBOARD_AddKey(KBD_leftalt, false);
25 KEYBOARD_AddKey(KBD_rightalt, false);
26 KEYBOARD_AddKey(KBD_leftctrl, false);
27 KEYBOARD_AddKey(KBD_rightctrl, false);
28 KEYBOARD_AddKey(KBD_leftshift, false);
29 KEYBOARD_AddKey(KBD_rightshift, false);
30}
31
32MAPPER_AddHandler(&ClearShiftStates,MK_f6,MMOD1|MMOD2,"unshift","Clr Shifts");	
33MAPPER_AddHandler(&FixKeyboardScreen,MK_f3,MMOD1|MMOD2,"fixall","FixKBD/Scr");

As I said, I remember being very pleased to get this working, but that was a long time ago, and I wonder if some revisions to SVN might have caused it to stop working. I'll be very grateful for any advice.

Reply 1 of 1, by emendelson

Posted on 2017-02-03, 14:02

emendelson Offline

Rank Oldbie

Rank: Oldbie
Posts: 854
Joined: 2010-02-14, 02:00

Apologies for wasting bandwidth on the question above. There was no problem with the code (I think). It turns out that my video driver was preventing the DOSBox window from refreshing. (I still use a GeForce 7600GS because it's the fastest video card that supports a continuous underline in MODE MONO.) This wasn't a DOSBox issue at all.

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