tk: Add button widget

1 files changed, 125 insertions, 0 deletions

diff --git a/src/tk/button.c b/src/tk/button.c
new file mode 100644
index 0000000..c7d0c5f
--- /dev/null
+++ b/src/tk/button.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Maze Fight
+ *
+ * Maze Fight is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Maze Fight is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Maze Fight.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <SDL.h>
+#include "../tk.h"
+#include "widget.h"
+
+struct mftk_button {
+	struct mftk_widget   parent;
+	struct mftk_widget  *label;
+	SDL_Color           *fill_color;
+	int                  padding;
+	int                (*action)(void *);
+	void                *user_data;
+};
+
+static void
+_mftk_button_layout(struct mftk_widget *w)
+{
+	struct mftk_button *b = (struct mftk_button *) w;
+
+	mftk_widget_layout(b->label);
+
+	w->w = b->label->w + b->padding * 2;
+	w->h = b->label->h + b->padding * 2;
+}
+
+static int
+_mftk_button_event(struct mftk_widget *w, SDL_Event *e)
+{
+	struct mftk_button *b = (struct mftk_button *) w;
+
+	switch (e->type) {
+		case SDL_MOUSEBUTTONUP:
+			if (e->button.button == SDL_BUTTON_LEFT) {
+				return b->action(b->user_data);
+			}
+			break;
+		default:
+			break;
+	}
+
+	return 0;
+}
+
+static int
+_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;
+
+	rect.x = x;
+	rect.y = y;
+	rect.w = w->w;
+	rect.h = w->h;
+	if (SDL_SetRenderDrawColor(renderer,
+				b->fill_color->r, b->fill_color->g,
+				b->fill_color->b, b->fill_color->a) < 0 ||
+			SDL_RenderFillRect(renderer, &rect) < 0) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't render widget: %s",
+				SDL_GetError());
+		return -1;
+	}
+
+	if (mftk_widget_render(b->label, renderer,
+				x + b->padding, y + b->padding) < 0) {
+		return -1;
+	}
+
+	return 0;
+}
+
+static void
+_mftk_button_destroy(struct mftk_widget *w)
+{
+	struct mftk_button *b = (struct mftk_button *) w;
+
+	mftk_widget_destroy(&b->label);
+}
+
+struct mftk_widget *
+mftk_button_new(TTF_Font *font, const char *text, SDL_Color *text_color,
+		SDL_Color *fill_color, int padding,
+		int (*action)(void *), void *user_data, SDL_Renderer *renderer)
+{
+	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;
+
+	b->label = mftk_label_new(font, text, text_color, renderer);
+	if (b->label == NULL) {
+		free(b);
+		return NULL;
+	}
+
+	b->fill_color = fill_color;
+	b->padding    = padding;
+	b->action     = action;
+	b->user_data  = user_data;
+
+	return w;
+}