From 62ec32d9b7fb00dd101762c2234228221f9674b9 Mon Sep 17 00:00:00 2001
From: Sara <sara@saragerretsen.nl>
Date: Wed, 17 Sep 2025 21:58:27 +0200
Subject: [PATCH] feat: added scroll motion shifting and delta time

---
 src/main.c | 38 +++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/src/main.c b/src/main.c
index c912efd..2c3a563 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,4 +1,5 @@
 #include <SDL3/SDL_hints.h>
+#include <SDL3/SDL_keycode.h>
 #include <SDL3/SDL_oldnames.h>
 #include <clay/clay.h>
 #include "renderer/clay_renderer_SDL3.h"
@@ -48,7 +49,7 @@ void LogOutputResolution() {
 	SDL_Log("output size: %i, %d", w, h);
 }
 
-static inline
+static
 Clay_Dimensions MeasureText(Clay_StringSlice text, Clay_TextElementConfig *config, void *userData) {
 	TTF_Font **fonts = userData;
 	TTF_Font *font = fonts[config->fontId];
@@ -57,10 +58,7 @@ Clay_Dimensions MeasureText(Clay_StringSlice text, Clay_TextElementConfig *confi
 	if (!TTF_GetStringSize(font, text.chars, text.length, &width, &height)) {
 		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "MeasureText failed to measure text %s", SDL_GetError());
 	}
-	return (Clay_Dimensions) {
-		.width = text.length * config->fontSize,
-		.height = config->fontSize
-	};
+	return (Clay_Dimensions) { width, height };
 }
 
 static
@@ -132,7 +130,14 @@ int main(int argc, char *argv[]) {
 		.textEngine = textEngine,
 	};
 	SDL_Event event;
+	uint64_t startFrameTime = SDL_GetTicksNS();
+	double deltaTime = 0.0;
+	bool mouseButtonDown = false;
+	bool shiftDown = false;
 	while (running) {
+		deltaTime = SDL_GetTicksNS() - startFrameTime;
+		startFrameTime = SDL_GetTicksNS();
+		Clay_Vector2 scrollMotion = { 0, 0 };
 		while (SDL_PollEvent(&event)) {
 			HandleEvent(event);
 			switch (event.type) {
@@ -147,17 +152,32 @@ int main(int argc, char *argv[]) {
 					LogOutputResolution();
 					break;
 				case SDL_EVENT_MOUSE_WHEEL:
-					Clay_UpdateScrollContainers(true, (Clay_Vector2){ event.wheel.x, event.wheel.y }, 0.01f);
+					if (shiftDown) {
+						scrollMotion = (Clay_Vector2) { event.wheel.y * 2.f, event.wheel.x * 2.f };
+					} else {
+						scrollMotion = (Clay_Vector2) { event.wheel.x * 2.f, event.wheel.y * 2.f };
+					}
 					break;
 				case SDL_EVENT_MOUSE_MOTION:
-					Clay_SetPointerState((Clay_Vector2) { event.motion.x, event.motion.y }, event.motion.state & SDL_BUTTON_LEFT);
+					Clay_SetPointerState((Clay_Vector2) { event.motion.x, event.motion.y }, mouseButtonDown);
 					break;
 				case SDL_EVENT_MOUSE_BUTTON_DOWN:
-					Clay_SetPointerState((Clay_Vector2) { event.button.x, event.button.y }, event.button.button == SDL_BUTTON_LEFT);
-				default:
+				case SDL_EVENT_MOUSE_BUTTON_UP:
+					if (event.button.button == SDL_BUTTON_LEFT) {
+						mouseButtonDown = event.button.down;
+						Clay_SetPointerState((Clay_Vector2) { event.button.x, event.button.y }, mouseButtonDown);
+					}
 					break;
+				case SDL_EVENT_KEY_DOWN:
+				case SDL_EVENT_KEY_UP:
+					if (event.key.key == SDLK_LSHIFT || event.key.key == SDLK_RSHIFT) {
+						shiftDown = event.key.down;
+					}
+					break;
+				default: break;
 			}
 		}
+		Clay_UpdateScrollContainers(true, scrollMotion, deltaTime);
 		SDL_SetRenderDrawColor(renderer, 10, 10, 10, 255);
 		SDL_RenderClear(renderer);
 		Clay_RenderCommandArray array = RenderApplication();