From e4ee5e9bc0f441a646befa8196c52590473ce6c4 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 19 Mar 2021 11:32:43 -0400
Subject: help: Handle mouse events

---
diff --git a/src/help.c b/src/help.c
index 0399c36..eed28c6 100644
--- a/src/help.c
+++ b/src/help.c
@@ -20,6 +20,7 @@
 #include <SDL.h>
 #include <SDL_ttf.h>
 #include <config.h>
+#include "collision.h"
 #include "help.h"
 #include "main.h"
 #include "output.h"
@@ -96,6 +97,10 @@ db_help(void)
 	SDL_Texture  *texture;
 	SDL_Rect      text_src_rect;
 	SDL_Rect      text_dst_rect;
+	SDL_Rect      up_rect;
+	SDL_Rect      dn_rect;
+	int           up_over;
+	int           dn_over;
 	SDL_Event     event;
 
 	font_path = db_strcat(db_get_fonts_dir(), "/UbuntuTitling-Bold.ttf");
@@ -139,6 +144,18 @@ db_help(void)
 	text_dst_rect.w = 592;
 	text_dst_rect.h = 448;
 
+	up_rect.x = 608;
+	up_rect.y =  16;
+	up_rect.w =  16;
+	up_rect.h =   8;
+
+	dn_rect.x = 608;
+	dn_rect.y = 456;
+	dn_rect.w =  16;
+	dn_rect.h =   8;
+
+	up_over = 0;
+	dn_over = 0;
 	_db_help_quit = 0;
 	while (SDL_WaitEvent(&event)) {
 		switch (event.type) {
@@ -180,6 +197,49 @@ db_help(void)
 						break;
 				}
 				break;
+			case SDL_MOUSEMOTION:
+				if (event.motion.state != 0) {
+					break;
+				}
+				if (db_pt_in_rect(event.motion.x,
+							event.motion.y,
+							&up_rect)) {
+					up_over = 1;
+					break;
+				} else {
+					up_over = 0;
+				}
+				if (db_pt_in_rect(event.motion.x,
+							event.motion.y,
+							&dn_rect)) {
+					dn_over = 1;
+					break;
+				} else {
+					dn_over = 0;
+				}
+				break;
+			case SDL_MOUSEBUTTONDOWN:
+				if (event.button.button != SDL_BUTTON_LEFT) {
+					break;
+				}
+				if (db_pt_in_rect(event.button.x,
+							event.button.y,
+							&up_rect)) {
+					text_src_rect.y -= 16;
+					if (text_src_rect.y < 0) {
+						text_src_rect.y = 0;
+					}
+				} else if (db_pt_in_rect(event.button.x,
+							event.button.y,
+							&dn_rect)) {
+					text_src_rect.y += 16;
+					if (text_src_rect.y > surface->h -
+							text_src_rect.h) {
+						text_src_rect.y = surface->h -
+							text_src_rect.h;
+					}
+				}
+				break;
 			default:
 				break;
 		}
@@ -190,19 +250,25 @@ db_help(void)
 		SDL_RenderClear(renderer);
 		SDL_RenderCopy(renderer, texture,
 				&text_src_rect, &text_dst_rect);
-		if (text_src_rect.y > 0) {
+		if (text_src_rect.y <= 0) {
 			_db_help_triangle(renderer,
-					0x00, 0x00, 0xFF, 0xFF, 608,  16, -1);
+					0x3F, 0x3F, 0x7F, 0xFF, 608,  16, -1);
+		} else if (up_over == 1) {
+			_db_help_triangle(renderer,
+					0xFF, 0xFF, 0xFF, 0xFF, 608,  16, -1);
 		} else {
 			_db_help_triangle(renderer,
-					0x3F, 0x3F, 0x7F, 0xFF, 608,  16, -1);
+					0x00, 0x00, 0xFF, 0xFF, 608,  16, -1);
 		}
-		if (text_src_rect.y < surface->h - text_src_rect.h) {
+		if (text_src_rect.y >= surface->h - text_src_rect.h) {
 			_db_help_triangle(renderer,
-					0x00, 0x00, 0xFF, 0xFF, 608, 456,  1);
+					0x3F, 0x3F, 0x7F, 0xFF, 608, 456,  1);
+		} else if (dn_over == 1) {
+			_db_help_triangle(renderer,
+					0xFF, 0xFF, 0xFF, 0xFF, 608, 456,  1);
 		} else {
 			_db_help_triangle(renderer,
-					0x3F, 0x3F, 0x7F, 0xFF, 608, 456,  1);
+					0x00, 0x00, 0xFF, 0xFF, 608, 456,  1);
 		}
 		SDL_RenderPresent(renderer);
 	}
--
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