tk: Define widget and API

3 files changed, 130 insertions, 0 deletions

diff --git a/src/tk/local.mk b/src/tk/local.mk
new file mode 100644
index 0000000..39b1226
--- /dev/null
+++ b/src/tk/local.mk
@@ -0,0 +1,3 @@
+mazefight_SOURCES += \
+	%reldir%/widget.c \
+	%reldir%/widget.h
diff --git a/src/tk/widget.c b/src/tk/widget.c
new file mode 100644
index 0000000..1bf9407
--- /dev/null
+++ b/src/tk/widget.c
@@ -0,0 +1,88 @@
+/*
+ * 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_widget *
+mftk_widget_new(size_t size)
+{
+	struct mftk_widget *w;
+
+	w = calloc(1, size);
+	if (w == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create widget: %s",
+				strerror(errno));
+		return NULL;
+	}
+
+	w->vis = SDL_TRUE;
+
+	return w;
+}
+
+void
+mftk_widget_set_visible(struct mftk_widget *w, int v)
+{
+	w->vis = v;
+}
+
+int
+mftk_widget_get_visible(struct mftk_widget *w)
+{
+	return w->vis;
+}
+
+void
+mftk_widget_layout(struct mftk_widget *w)
+{
+	w->layout(w);
+}
+
+int
+mftk_widget_event(struct mftk_widget *w, SDL_Event *e)
+{
+	return w->event(w, e);
+}
+
+int
+mftk_widget_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
+{
+	return w->render(w, renderer, x, y);
+}
+
+void
+mftk_widget_destroy(struct mftk_widget **w_p)
+{
+	struct mftk_widget *w;
+
+	if (w_p == NULL || *w_p == NULL) {
+		return;
+	}
+	w = *w_p;
+
+	w->destroy(w);
+	free(w);
+	w = NULL;
+}
diff --git a/src/tk/widget.h b/src/tk/widget.h
new file mode 100644
index 0000000..2336388
--- /dev/null
+++ b/src/tk/widget.h
@@ -0,0 +1,39 @@
+/*
+ * 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/>.
+ */
+
+#ifndef MFTK_WIDGET_H_
+#define MFTK_WIDGET_H_
+
+#include <SDL.h>
+
+struct mftk_widget {
+	int    w;
+	int    h;
+	int    vis;
+	int    can_focus;
+	void (*layout)(struct mftk_widget *);
+	int  (*event)(struct mftk_widget *, SDL_Event *);
+	int  (*render)(struct mftk_widget *, SDL_Renderer *, int, int);
+	void (*destroy)(struct mftk_widget *);
+};
+
+struct mftk_widget *
+mftk_widget_new(size_t size);
+
+#endif  /* MFTK_WIDGET_H_ */