From 9b20f199806fe63292526279399c15c406740671 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 05 Aug 2021 14:45:14 -0400
Subject: tk: Handle radio button events

---
(limited to 'src/tk')

diff --git a/src/tk/check.c b/src/tk/check.c
index c8e639c..344ab16 100644
--- a/src/tk/check.c
+++ b/src/tk/check.c
@@ -44,6 +44,14 @@ mftk_check_set_shape(struct mftk_widget *w, enum mftk_check_shape shape)
 	c->shape = shape;
 }
 
+void
+mftk_check_set_state(struct mftk_widget *w, int state)
+{
+	struct mftk_check *c = (struct mftk_check *) w;
+
+	c->state = state;
+}
+
 static void
 _mftk_check_layout(struct mftk_widget *w)
 {
diff --git a/src/tk/radio.c b/src/tk/radio.c
index fcf63b3..1336b60 100644
--- a/src/tk/radio.c
+++ b/src/tk/radio.c
@@ -24,14 +24,39 @@
 #include "../tk.h"
 #include "widget.h"
 
+struct _mftk_radio_state {
+	struct mftk_radio *r;
+	int                state;
+};
+
 struct mftk_radio {
-	struct mftk_widget   parent;
-	struct mftk_widget  *grid;
-	int                  state;
-	int                (*action)(void *, int);
-	void                *user_data;
+	struct mftk_widget         parent;
+	struct mftk_widget       **children;
+	struct mftk_widget        *grid;
+	struct _mftk_radio_state  *states;
+	int                        state;
+	int                      (*action)(void *, int);
+	void                      *user_data;
 };
 
+static int
+_mftk_radio_state_change(void *user_data, int state)
+{
+	struct _mftk_radio_state *rs = (struct _mftk_radio_state *) user_data;
+
+	if (state == SDL_FALSE) {
+		/* Radio buttons can't be deselected */
+		mftk_check_set_state(rs->r->children[rs->r->state], SDL_TRUE);
+		return 0;
+	} else {
+		/* Deselect previous check button */
+		mftk_check_set_state(rs->r->children[rs->r->state], SDL_FALSE);
+		/* Set and announce new state */
+		rs->r->state = rs->state;
+		return rs->r->action(rs->r->user_data, rs->r->state);
+	}
+}
+
 static void
 _mftk_radio_layout(struct mftk_widget *w)
 {
@@ -64,6 +89,7 @@ _mftk_radio_destroy(struct mftk_widget *w)
 	struct mftk_radio *r = (struct mftk_radio *) w;
 
 	mftk_widget_destroy(&r->grid);
+	free(r->states);
 }
 
 struct mftk_widget *
@@ -73,47 +99,61 @@ mftk_radio_new(int butn_width, int butn_padding, SDL_Color *butn_color,
 		int (*action)(void *, int), void *user_data,
 		SDL_Renderer *renderer, int state, int options, ...)
 {
-	struct mftk_widget **children;
-	va_list              ap;
-	int                  i;
-	struct mftk_widget  *w;
-	struct mftk_radio   *r;
-
-	children = calloc(options, sizeof(*children));
-	if (children == NULL) {
+	struct mftk_widget *w;
+	struct mftk_radio  *r;
+	va_list             ap;
+	int                 i;
+
+	mftk_widget_init(w, r, radio);
+
+	r->children = calloc(options, sizeof(*r->children));
+	if (r->children == NULL) {
 		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
 				"Couldn't create widget: %s",
 				strerror(errno));
+		free(r);
+		return NULL;
+	}
+	r->states = calloc(options, sizeof(*r->states));
+	if (r->states == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create widget: %s",
+				strerror(errno));
+		free(r->children);
+		free(r);
 		return NULL;
 	}
 
 	va_start(ap, options);
 	for (i = 0; i < options; ++i) {
-		children[i] = mftk_check_new(butn_width, butn_padding,
+		r->children[i] = mftk_check_new(butn_width, butn_padding,
 				butn_color, mark_color, (i == state),
 				label_padding, font, va_arg(ap, const char *),
-				text_color, NULL/*TODO*/, NULL/*TODO*/,
-				renderer);
-		if (children[i] == NULL) {
+				text_color, _mftk_radio_state_change,
+				&r->states[i], renderer);
+		if (r->children[i] == NULL) {
 			for (; i >= 0; --i) {
-				mftk_widget_destroy(&children[i]);
+				mftk_widget_destroy(&r->children[i]);
 			}
-			free(children);
+			free(r->children);
+			free(r->states);
+			free(r);
 			va_end(ap);
 			return NULL;
 		}
-		mftk_check_set_shape(children[i], MFTK_CHECK_SHAPE_CIR);
+		mftk_check_set_shape(r->children[i], MFTK_CHECK_SHAPE_CIR);
+		r->states[i].r     = r;
+		r->states[i].state = i;
 	}
 	va_end(ap);
 
-	mftk_widget_init(w, r, radio);
-
-	r->grid = mftk_grid_new_a(options, 1, item_padding, 0, children);
+	r->grid = mftk_grid_new_a(options, 1, item_padding, 0, r->children);
 	if (r->grid == NULL) {
 		for (i = 0; i < options; ++i) {
-			mftk_widget_destroy(&children[i]);
+			mftk_widget_destroy(&r->children[i]);
 		}
-		free(children);
+		free(r->children);
+		free(r->states);
 		free(r);
 	}
 
diff --git a/src/tk/widget.h b/src/tk/widget.h
index 1ac5f46..402435c 100644
--- a/src/tk/widget.h
+++ b/src/tk/widget.h
@@ -62,4 +62,7 @@ enum mftk_check_shape {
 void
 mftk_check_set_shape(struct mftk_widget *w, enum mftk_check_shape shape);
 
+void
+mftk_check_set_state(struct mftk_widget *w, int state);
+
 #endif  /* MFTK_WIDGET_H_ */
--
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