context menu to jump to different mappings

1 files changed, 121 insertions, 0 deletions

diff --git a/src/menu.c b/src/menu.c
new file mode 100644
index 0000000..53eeffb
--- /dev/null
+++ b/src/menu.c
@@ -0,0 +1,121 @@
+#include <stdlib.h>
+#include <SDL3/SDL.h>
+#include <SDL3_ttf/SDL_ttf.h>
+#include "panic.h"
+#include "font.h"
+#include "main.h"
+#include "menu.h"
+
+#define MENU_PADDING 4
+
+static int option_at(menu *m, int x, int y) {
+	float cur_y = MENU_PADDING;
+	for (int i = 0; i < m->count; i++) {
+		float tw, th;
+		must(SDL_GetTextureSize(m->textures[i], &tw, &th));
+		cur_y += th;
+		if (y < cur_y) return i;
+	}
+	return -1;
+}
+
+menu *create_menu(menu_entry *entries, int count, int x, int y) {
+	menu *m = calloc(1, sizeof(menu));
+	if (!m) panic("out of memory");
+
+	m->window = must(SDL_CreatePopupWindow(window,
+		x + 2, y - 8, 0, 0, SDL_WINDOW_POPUP_MENU | SDL_WINDOW_BORDERLESS
+	));
+	m->renderer = must(SDL_CreateRenderer(m->window, NULL));
+
+	m->entries = entries;
+	m->count = count;
+	m->textures = calloc(count, sizeof(SDL_Texture *));
+	if (!m->textures) panic("out of memory");
+
+	int w = 0, h = 0;
+	for (int i = 0; i < count; i++) {
+		SDL_Color color = {0xff, 0xff, 0xff, 0xff};
+		SDL_Surface *text =
+			must(TTF_RenderText_Blended(font, m->entries[i].name, 0, color));
+		m->textures[i] = must(SDL_CreateTextureFromSurface(m->renderer, text));
+		float tw, th;
+		must(SDL_GetTextureSize(m->textures[i], &tw, &th));
+		w = SDL_max(w, tw);
+		h += th;
+	}
+	SDL_SetWindowSize(m->window, w + MENU_PADDING * 2, h + MENU_PADDING * 2);
+	SDL_RaiseWindow(m->window);
+	SDL_SyncWindow(m->window);
+	return m;
+}
+
+bool menu_handle_event(menu *m, SDL_Event e) {
+	switch (e.type) {
+	case SDL_EVENT_WINDOW_CLOSE_REQUESTED:
+		if (e.window.windowID == SDL_GetWindowID(m->window))
+			return false;
+		break;
+	case SDL_EVENT_MOUSE_BUTTON_DOWN:
+		if (e.button.windowID != SDL_GetWindowID(m->window)) {
+			return false;
+		}
+	case SDL_EVENT_MOUSE_BUTTON_UP:
+		if (e.button.windowID != SDL_GetWindowID(m->window)) {
+			break;
+		}
+		int option = option_at(m, e.button.x, e.button.y);
+		if (option != -1) {
+			m->entries[option].action(m->entries[option].data);
+			return false;
+		}
+		break;
+	case SDL_EVENT_KEY_DOWN:
+		if (e.key.key == SDLK_ESCAPE) return false;
+		break;
+	case SDL_EVENT_QUIT:
+		return false;
+	default:
+	}
+	return true;
+}
+
+void menu_render(menu *m) {
+	int ww, wh;
+	SDL_GetWindowSize(m->window, &ww, &wh);
+	float mx, my;
+	SDL_GetMouseState(&mx, &my);
+	int hovered = -1;
+	if (SDL_GetWindowFlags(m->window) & SDL_WINDOW_MOUSE_FOCUS)
+		hovered = option_at(m, mx, my);
+
+	SDL_RenderClear(m->renderer);
+	float x = MENU_PADDING, y = MENU_PADDING;
+	for (int i = 0; i < m->count; i++) {
+		SDL_FRect dst;
+		dst.x = x;
+		dst.y = y;
+		must(SDL_GetTextureSize(m->textures[i], &dst.w, &dst.h));
+		if (i == hovered) {
+			SDL_FRect highlight_rect = {0, y, ww, dst.h};
+			SDL_SetRenderDrawColor(m->renderer, 0x50, 0x50, 0x50, 0xff);
+			SDL_RenderFillRect(m->renderer, &highlight_rect);
+			SDL_SetRenderDrawColor(m->renderer, 0x00, 0x00, 0x00, 0xff);
+		}
+		SDL_RenderTexture(m->renderer, m->textures[i], NULL, &dst);
+		y += dst.h;
+	}
+	SDL_FRect border_rect = {0, 0, ww, wh};
+	SDL_RenderRect(m->renderer, &border_rect);
+	SDL_RenderPresent(m->renderer);
+}
+
+void close_menu(menu *m) {
+	for (int i = 0; i < m->count; i++) {
+		SDL_DestroyTexture(m->textures[i]);
+	}
+	free(m->textures);
+	SDL_DestroyRenderer(m->renderer);
+	SDL_DestroyWindow(m->window);
+	free(m);
+}