1 files changed, 74 insertions, 0 deletions
diff --git a/src/tooltip.c b/src/tooltip.c
new file mode 100644
index 0000000..e900e40
--- /dev/null
+++ b/src/tooltip.c
@@ -0,0 +1,74 @@
+#include <SDL3/SDL.h>
+#include <SDL3_ttf/SDL_ttf.h>
+#include "panic.h"
+#include "font.h"
+#include "hash.h"
+#include "main.h"
+#include "tooltip.h"
+
+#define PADDING 4
+
+void set_tooltip_text(tooltip *t, const char *text) {
+	if (!t->window) {
+		t->window = must(SDL_CreatePopupWindow(window,
+			0, 0, 0, 0, SDL_WINDOW_TOOLTIP | SDL_WINDOW_BORDERLESS
+		));
+		t->renderer = must(SDL_CreateRenderer(t->window, NULL));
+	}
+	uint64_t hash = fnv(text, text ? strlen(text) : 0);
+	if (hash == t->hash) {
+		return;
+	}
+	t->hash = hash;
+	if (t->texture) {
+		SDL_DestroyTexture(t->texture);
+		t->texture = NULL;
+	}
+	if (!text) return;
+	SDL_Color color = {0xff, 0xff, 0xff, 0xff};
+	SDL_Surface *s = must(TTF_RenderText_Blended_Wrapped(
+		font, text, 0, color, 0
+	));
+	t->texture = must(SDL_CreateTextureFromSurface(t->renderer, s));
+	SDL_DestroySurface(s);
+	float tw, th;
+	SDL_GetTextureSize(t->texture, &tw, &th);
+	SDL_SetWindowSize(t->window, tw + PADDING*2, th + PADDING*2);
+	SDL_SyncWindow(t->window);
+}
+
+void show_tooltip(tooltip *t, int x, int y) {
+	if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS)) {
+		hide_tooltip(t);
+		return;
+	}
+	if (!t->texture) {
+		hide_tooltip(t);
+		return;
+	}
+	float tw, th;
+	SDL_GetTextureSize(t->texture, &tw, &th);
+	SDL_SetWindowPosition(t->window, x + PADDING, y - th - PADDING*3);
+	if (t->hidden) {
+		SDL_ShowWindow(t->window);
+		SDL_SyncWindow(t->window);
+		t->hidden = false;
+	}
+
+	SDL_SetRenderDrawColor(t->renderer, 0, 0, 0x20, 0xff);
+	SDL_RenderClear(t->renderer);
+	SDL_SetRenderDrawColor(t->renderer, 0, 0, 0, 0xff);
+	SDL_FRect dst = {PADDING, PADDING, tw, th};
+	SDL_RenderTexture(t->renderer, t->texture, NULL, &dst);
+	SDL_FRect border_rect = {0, 0, tw + PADDING*2, th + PADDING*2};
+	SDL_SetRenderDrawColor(t->renderer, 0x50, 0x50, 0x50, 0xff);
+	SDL_RenderRect(t->renderer, &border_rect);
+	must(SDL_RenderPresent(t->renderer));
+}
+
+void hide_tooltip(tooltip *t) {
+	if (t->window && !t->hidden) {
+		SDL_HideWindow(t->window);
+		t->hidden = true;
+	}
+}