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checkkeys: draw a blinking cursor

This commit is contained in:
Sam Lantinga 2024-06-24 07:07:40 -07:00
parent 505badb7af
commit 138eb8649d
1 changed files with 36 additions and 0 deletions
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36
test/checkkeys.c
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@ -26,9 +26,13 @@
#define TEXT_WINDOW_OFFSET_X 2.0f #define TEXT_WINDOW_OFFSET_X 2.0f
#define TEXT_WINDOW_OFFSET_Y (2.0f + FONT_LINE_HEIGHT) #define TEXT_WINDOW_OFFSET_Y (2.0f + FONT_LINE_HEIGHT)
#define CURSOR_BLINK_INTERVAL_MS 500
static SDLTest_CommonState *state; static SDLTest_CommonState *state;
static SDLTest_TextWindow **textwindows; static SDLTest_TextWindow **textwindows;
static SDL_bool escape_pressed; static SDL_bool escape_pressed;
static SDL_bool cursor_visible;
static Uint64 last_cursor_change;
static int done; static int done;
static SDLTest_TextWindow *GetTextWindowForWindowID(SDL_WindowID id) static SDLTest_TextWindow *GetTextWindowForWindowID(SDL_WindowID id)
@ -264,9 +268,28 @@ static void CountKeysDown(void)
SDL_Log("Keys down: %d\n", count); SDL_Log("Keys down: %d\n", count);
} }
static void DrawCursor(int i)
{
SDL_FRect rect;
int current = textwindows[i]->current;
const char *current_line = textwindows[i]->lines[current];
rect.x = TEXT_WINDOW_OFFSET_X;
if (current_line) {
rect.x += SDL_utf8strlen(current_line) * FONT_CHARACTER_SIZE;
}
rect.y = TEXT_WINDOW_OFFSET_Y + current * FONT_LINE_HEIGHT;
rect.w = FONT_CHARACTER_SIZE * 0.75f;
rect.h = FONT_CHARACTER_SIZE;
SDL_SetRenderDrawColor(state->renderers[i], 0xAA, 0xAA, 0xAA, 255);
SDL_RenderFillRect(state->renderers[i], &rect);
}
static void loop(void) static void loop(void)
{ {
SDL_Event event; SDL_Event event;
Uint64 now;
int i; int i;
while (SDL_PollEvent(&event)) { while (SDL_PollEvent(&event)) {
@ -344,15 +367,28 @@ static void loop(void)
} }
} }
now = SDL_GetTicks();
for (i = 0; i < state->num_windows; i++) { for (i = 0; i < state->num_windows; i++) {
char caption[1024]; char caption[1024];
/* Clear the window */
SDL_SetRenderDrawColor(state->renderers[i], 0, 0, 0, 255); SDL_SetRenderDrawColor(state->renderers[i], 0, 0, 0, 255);
SDL_RenderClear(state->renderers[i]); SDL_RenderClear(state->renderers[i]);
/* Draw the text */
SDL_SetRenderDrawColor(state->renderers[i], 255, 255, 255, 255); SDL_SetRenderDrawColor(state->renderers[i], 255, 255, 255, 255);
SDL_snprintf(caption, sizeof(caption), "Text input %s (click mouse button to toggle)\n", SDL_TextInputActive(state->windows[i]) ? "enabled" : "disabled"); SDL_snprintf(caption, sizeof(caption), "Text input %s (click mouse button to toggle)\n", SDL_TextInputActive(state->windows[i]) ? "enabled" : "disabled");
SDLTest_DrawString(state->renderers[i], TEXT_WINDOW_OFFSET_X, TEXT_WINDOW_OFFSET_X, caption); SDLTest_DrawString(state->renderers[i], TEXT_WINDOW_OFFSET_X, TEXT_WINDOW_OFFSET_X, caption);
SDLTest_TextWindowDisplay(textwindows[i], state->renderers[i]); SDLTest_TextWindowDisplay(textwindows[i], state->renderers[i]);
/* Draw the cursor */
if ((now - last_cursor_change) >= CURSOR_BLINK_INTERVAL_MS) {
cursor_visible = !cursor_visible;
last_cursor_change = now;
}
if (cursor_visible) {
DrawCursor(i);
}
SDL_RenderPresent(state->renderers[i]); SDL_RenderPresent(state->renderers[i]);
} }