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synced 2024-08-20 09:29:01 +00:00
Allow access to the last key pressed and key_pressed status
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@ -29,9 +29,17 @@ typedef struct {
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*/
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int xcoords;
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int ycoords;
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/*
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* This is true when a key is pressed, and false if not. We
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* determine this from an SDL_PollEvent() call.
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*/
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bool key_pressed;
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} vm_screen;
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extern bool vm_screen_active(vm_screen *);
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extern bool vm_screen_key_pressed(vm_screen *);
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extern char vm_screen_last_key(vm_screen *);
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extern int vm_screen_add_window(vm_screen *, int, int);
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extern int vm_screen_init();
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extern int vm_screen_xcoords(vm_screen *);
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@ -6,6 +6,7 @@
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* program, which only knows to call the functions here.
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*/
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#include <ctype.h>
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#include <stdbool.h>
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#include <stdlib.h>
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@ -163,8 +164,45 @@ vm_screen_free(vm_screen *screen)
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bool
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vm_screen_active(vm_screen *screen)
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{
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SDL_Event event;
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char ch;
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static int counter = 100;
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// There may be _many_ events in the queue; for example, you may be
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// facerolling on Zork because it feels good. And good for you if
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// so--but still we have to handle all those keyboard events!
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while (SDL_PollEvent(&event)) {
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ch = '\0';
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// It seems we may have pressed a key...
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if (event.key) {
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// The sym field is of type SDL_Keycode; this type, however,
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// maps roughly to Unicode, which of course maps roughly to
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// ASCII in the low range.
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ch = (char)event.key->keysym.sym;
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// If we had shift pressed, we need to uppercase the
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// character.
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if (event.key->keysym.mod & KMOD_LSHIFT ||
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event.key->keysym.mod & KMOD_RSHIFT
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) {
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ch = toupper(ch);
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}
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}
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switch (event.type) {
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case SDL_KEYDOWN:
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screen->key_pressed = true;
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screen->last_key = ch;
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break;
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case SDL_KEYUP:
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// Note we do not erase the last_key value.
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screen->key_pressed = false;
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break;
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}
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}
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if (counter--) {
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return true;
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}
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@ -210,3 +248,24 @@ vm_screen_draw_rect(vm_screen *screen, vm_area *area)
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SDL_RenderFillRect(screen->render, &rect);
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}
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/*
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* Just a simple wrapper around the key pressed state (mostly in case we
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* ever switch from SDL to something else, and a field stops making
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* sense).
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*/
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bool
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vm_screen_key_pressed(vm_screen *scr)
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{
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return scr->key_pressed;
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}
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/*
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* Similar logic as for key_pressed; this is just a dumb getter for the
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* last_key field.
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*/
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char
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vm_screen_last_key(vm_screen *scr)
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{
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return scr->last_key;
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}
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