From 92caa6344f71f3681ed255b56ecfa9294f497ab9 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 27 Jan 2022 18:46:46 -0500
Subject: tk: Add border with focus indication to button

---
(limited to 'src/tk/button.c')

diff --git a/src/tk/button.c b/src/tk/button.c
index c0a0c61..fa0cb65 100644
--- a/src/tk/button.c
+++ b/src/tk/button.c
@@ -26,6 +26,7 @@ struct mftk_button {
 	struct mftk_widget   parent;
 	struct mftk_widget  *label;
 	int                  padding;
+	int                  border;
 	int                (*action)(void *);
 	void                *user_data;
 };
@@ -37,8 +38,8 @@ _mftk_button_layout(struct mftk_widget *w)
 
 	mftk_widget_layout(b->label);
 
-	w->w = b->label->w + b->padding * 2;
-	w->h = b->label->h + b->padding * 2;
+	w->w = b->label->w + b->padding * 2 + b->border * 2;
+	w->h = b->label->h + b->padding * 2 + b->border * 2;
 }
 
 static void
@@ -107,11 +108,32 @@ _mftk_button_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
 {
 	struct mftk_button *b = (struct mftk_button *) w;
 	SDL_Rect            rect;
+	SDL_Color           border;
 
 	rect.x = x;
 	rect.y = y;
 	rect.w = w->w;
 	rect.h = w->h;
+	if (w->focused == SDL_TRUE) {
+		border.r = MFTK_COLOR_BDRF_R, border.g = MFTK_COLOR_BDRF_G;
+		border.b = MFTK_COLOR_BDRF_B, border.a = MFTK_COLOR_BDRF_A;
+	} else {
+		border.r = MFTK_COLOR_BDRN_R, border.g = MFTK_COLOR_BDRN_G;
+		border.b = MFTK_COLOR_BDRN_B, border.a = MFTK_COLOR_BDRN_A;
+	}
+	if (SDL_SetRenderDrawColor(renderer,
+				border.r, border.g, border.b, border.a) < 0 ||
+			SDL_RenderFillRect(renderer, &rect) < 0) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't render widget: %s",
+				SDL_GetError());
+		return -1;
+	}
+
+	rect.x += b->border;
+	rect.y += b->border;
+	rect.w -= b->border * 2;
+	rect.h -= b->border * 2;
 	if (SDL_SetRenderDrawColor(renderer,
 				MFTK_COLOR_BACK_R, MFTK_COLOR_BACK_G,
 				MFTK_COLOR_BACK_B, MFTK_COLOR_BACK_A) < 0 ||
@@ -139,7 +161,7 @@ _mftk_button_destroy(struct mftk_widget *w)
 }
 
 struct mftk_widget *
-mftk_button_new(TTF_Font *font, const char *text, int padding,
+mftk_button_new(TTF_Font *font, const char *text, int padding, int border,
 		int (*action)(void *), void *user_data, SDL_Renderer *renderer)
 {
 	struct mftk_widget *w;
@@ -154,6 +176,7 @@ mftk_button_new(TTF_Font *font, const char *text, int padding,
 	}
 
 	b->padding   = padding;
+	b->border    = border;
 	b->action    = action;
 	b->user_data = user_data;
 
--
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