From 072f42236fb0d2509608a3ad345df2c5cf71f8dd Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 04 Aug 2021 19:58:00 -0400
Subject: tk: Reduce initialization boilerplate code

---
diff --git a/src/tk/button.c b/src/tk/button.c
index c7d0c5f..0db91a9 100644
--- a/src/tk/button.c
+++ b/src/tk/button.c
@@ -103,12 +103,7 @@ mftk_button_new(TTF_Font *font, const char *text, SDL_Color *text_color,
 	struct mftk_widget *w;
 	struct mftk_button *b;
 
-	if ((w = mftk_widget_new(sizeof(*b))) == NULL) return NULL;
-	b = (struct mftk_button *) w;
-	w->layout  = &_mftk_button_layout;
-	w->event   = &_mftk_button_event;
-	w->render  = &_mftk_button_render;
-	w->destroy = &_mftk_button_destroy;
+	mftk_widget_init(w, b, button);
 
 	b->label = mftk_label_new(font, text, text_color, renderer);
 	if (b->label == NULL) {
diff --git a/src/tk/grid.c b/src/tk/grid.c
index 4f09928..5994929 100644
--- a/src/tk/grid.c
+++ b/src/tk/grid.c
@@ -142,12 +142,7 @@ mftk_grid_new(int rows, int cols, int row_spacing, int col_spacing, ...)
 	int                 r;
 	int                 c;
 
-	if ((w = mftk_widget_new(sizeof(*g))) == NULL) return NULL;
-	g = (struct mftk_grid *) w;
-	w->layout  = &_mftk_grid_layout;
-	w->event   = &_mftk_grid_event;
-	w->render  = &_mftk_grid_render;
-	w->destroy = &_mftk_grid_destroy;
+	mftk_widget_init(w, g, grid);
 
 	g->children = calloc(rows * cols, sizeof(*g->children));
 	if (g->children == NULL) {
diff --git a/src/tk/label.c b/src/tk/label.c
index e9ae38c..ec4400a 100644
--- a/src/tk/label.c
+++ b/src/tk/label.c
@@ -85,12 +85,7 @@ mftk_label_new(TTF_Font *font, const char *text, SDL_Color *color,
 	const char         *c;
 	int                 glyph_max_y;
 
-	if ((w = mftk_widget_new(sizeof(*l))) == NULL) return NULL;
-	l = (struct mftk_label *) w;
-	w->layout  = &_mftk_label_layout;
-	w->event   = &_mftk_label_event;
-	w->render  = &_mftk_label_render;
-	w->destroy = &_mftk_label_destroy;
+	mftk_widget_init(w, l, label);
 
 	surface = TTF_RenderUTF8_Blended(font, text, *color);
 	if (surface == NULL) {
diff --git a/src/tk/widget.h b/src/tk/widget.h
index 2336388..ae81553 100644
--- a/src/tk/widget.h
+++ b/src/tk/widget.h
@@ -36,4 +36,17 @@ struct mftk_widget {
 struct mftk_widget *
 mftk_widget_new(size_t size);
 
+#define mftk_widget_init(w, t_w, name) \
+	do { \
+		w = mftk_widget_new(sizeof(struct mftk_##name)); \
+		if (w == NULL) { \
+			return NULL; \
+		}; \
+		w->layout  = &_mftk_##name##_layout; \
+		w->event   = &_mftk_##name##_event; \
+		w->render  = &_mftk_##name##_render; \
+		w->destroy = &_mftk_##name##_destroy; \
+		t_w = (struct mftk_##name *) w; \
+	} while (0)
+
 #endif  /* MFTK_WIDGET_H_ */
--
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