From 8cdfd577b4f7d70acddde353b600559010ea6d39 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 04 Aug 2021 19:06:24 -0400
Subject: tk: Add grid widget

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

diff --git a/src/tk/grid.c b/src/tk/grid.c
new file mode 100644
index 0000000..4f09928
--- /dev/null
+++ b/src/tk/grid.c
@@ -0,0 +1,195 @@
+/*
+ * 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 "errno.h"
+#include <stdlib.h>
+#include <string.h>
+#include "../tk.h"
+#include "widget.h"
+
+struct mftk_grid {
+	struct mftk_widget   parent;
+	int                  rows;
+	int                  cols;
+	struct mftk_widget **children;
+	int                 *children_x;
+	int                 *children_y;
+	int                  row_spacing;
+	int                  col_spacing;
+};
+
+static void
+_mftk_grid_layout(struct mftk_widget *w)
+{
+	struct mftk_grid *g = (struct mftk_grid *) w;
+	int               r;
+	int               c;
+	int               sz;
+	int               max_sz;
+
+	w->h = 0;
+	for (r = 0; r < g->rows; ++r) {
+		g->children_y[r] = w->h;
+		max_sz = 0;
+		for (c = 0; c < g->cols; ++c) {
+			mftk_widget_layout(g->children[r * g->cols + c]);
+			sz = g->children[r * g->cols + c]->h;
+			if (sz > max_sz) {
+				max_sz = sz;
+			}
+		}
+		if (r > 0) {
+			w->h += g->row_spacing;
+		}
+		w->h += max_sz;
+	}
+
+	w->w = 0;
+	for (c = 0; c < g->cols; ++c) {
+		g->children_x[c] = w->w;
+		max_sz = 0;
+		for (r = 0; r < g->rows; ++r) {
+			sz = g->children[r * g->cols + c]->w;
+			if (sz > max_sz) {
+				max_sz = sz;
+			}
+		}
+		if (c > 0) {
+			w->w += g->col_spacing;
+		}
+		w->w += max_sz;
+	}
+}
+
+static int
+_mftk_grid_event(struct mftk_widget *w, SDL_Event *e)
+{
+	struct mftk_grid *g = (struct mftk_grid *) w;
+
+	switch (e->type) {
+		case SDL_MOUSEBUTTONUP:
+			break;
+		default:
+			break;
+	}
+
+	return 0;
+}
+
+static int
+_mftk_grid_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
+{
+	struct mftk_grid *g = (struct mftk_grid *) w;
+	int               e = 0;
+	int               r;
+	int               c;
+
+	for (r = 0; r < g->rows; ++r) {
+		for (c = 0; c < g->cols; ++c) {
+			if (mftk_widget_render(g->children[r * g->cols + c],
+						renderer,
+						x + g->children_x[c],
+						y + g->children_y[r]) < 0) {
+				e = -1;
+			}
+		}
+	}
+
+	return e;
+}
+
+static void
+_mftk_grid_destroy(struct mftk_widget *w)
+{
+	struct mftk_grid *g = (struct mftk_grid *) w;
+	int               r;
+	int               c;
+
+	for (r = 0; r < g->rows; ++r) {
+		for (c = 0; c < g->cols; ++c) {
+			mftk_widget_destroy(&g->children[r * g->cols + c]);
+		}
+	}
+
+	free(g->children);
+	free(g->children_x);
+	free(g->children_y);
+}
+
+struct mftk_widget *
+mftk_grid_new(int rows, int cols, int row_spacing, int col_spacing, ...)
+{
+	struct mftk_widget *w;
+	struct mftk_grid   *g;
+	va_list             ap;
+	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;
+
+	g->children = calloc(rows * cols, sizeof(*g->children));
+	if (g->children == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create widget: %s",
+				strerror(errno));
+		free(g);
+		return NULL;
+	}
+	g->children_x = calloc(cols, sizeof(*g->children_x));
+	if (g->children_x == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create widget: %s",
+				strerror(errno));
+		free(g->children);
+		free(g);
+		return NULL;
+	}
+	g->children_y = calloc(rows, sizeof(*g->children_y));
+	if (g->children_y == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create widget: %s",
+				strerror(errno));
+		free(g->children_x);
+		free(g->children);
+		free(g);
+		return NULL;
+	}
+
+	g->rows        = rows;
+	g->cols        = cols;
+	g->row_spacing = row_spacing;
+	g->col_spacing = col_spacing;
+
+	va_start(ap, col_spacing);
+	for (r = 0; r < g->rows; ++r) {
+		for (c = 0; c < g->cols; ++c) {
+			g->children[r * g->cols + c] = va_arg(ap,
+					struct mftk_widget *);
+		}
+	}
+	va_end(ap);
+
+	return w;
+}
--
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