Introduce a weak notion of inheritance

include/GToolkit.h

@@ -31,6 +31,7 @@
 #ifndef GTOOLKIT_GTOOLKIT_H
 # define GTOOLKIT_GTOOLKIT_H
 
+# include "GToolkit/GWidget.h"
 # include "GToolkit/GWindow.h"
 
 

include/GToolkit/GWidget.h

@@ -35,5 +35,10 @@
 /* GWidget */
 /* types */
 typedef struct _GWidget GWidget;
+# define GWIDGET(gwidget) (GWidget *)(gwidget)
+
+
+/* functions */
+void gwidget_show(GWidget * gwidget);
 
 #endif /* !GTOOLKIT_GWIDGET_H */

include/GToolkit/GWindow.h

@@ -55,6 +55,5 @@ void gwindow_set_title(GWindow * gwindow, char const * title);
 
 /* useful */
 void gwindow_resize(GWindow * gwindow, int width, int height);
-void gwindow_show(GWindow * gwindow);
 
 #endif /* !GTOOLKIT_GWINDOW_H */

src/common.h

@@ -34,8 +34,19 @@
 # include <X11/Xlib.h>
 # include <GL/glu.h>
 # include <GL/glx.h>
+# include <GToolkit.h>
 
 
+/* types */
+typedef enum _GWidgetHandler
+{
+	GWIDGET_HANDLER_SHOW = 0
+} GWidgetHandler;
+# define GWIDGET_HANDLER_LAST GWIDGET_HANDLER_SHOW
+# define GWIDGET_HANDLER_COUNT (GWIDGET_HANDLER_LAST + 1)
+
+
+/* functions */
 /* GToolkit */
 /* accessors */
 Display * gtoolkit_get_display(void);
@@ -47,6 +58,15 @@ void gtoolkit_register_window(GWindow * gwindow);
 void gtoolkit_deregister_window(GWindow * gwindow);
 
 
+/* GWidget */
+GWidget * gwidget_new(void);
+void gwidget_delete(GWidget * gwidget);
+
+/* useful */
+void gwidget_set_handler(GWidget * gwidget, GWidgetHandler handler, ...);
+void gwidget_set_self(GWidget * gwidget, void * self);
+
+
 /* GWindow */
 /* accessors */
 Window gwindow_get_window(GWindow * gwindow);

src/gwidget.c

@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2006-2020 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2020 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS Graphics GToolkit */
 /* All rights reserved.
  *
@@ -28,13 +28,81 @@
 
 
 
-#ifndef GTOOLKIT_GWIDGET_H
+#include <stdarg.h>
-# define GTOOLKIT_GWIDGET_H
+#include <stdlib.h>
+#include "common.h"
 
 
 /* GWidget */
-/* public */
+/* private */
 /* types */
-GWidget * widget;
+typedef void (*GWidgetHandlerSelf)(void * self);
 
-#endif /* !GTOOLKIT_GWIDGET_H */
+struct _GWidget
+{
+	GWidget * gwidget;
+
+	/* GWidget */
+	void * self;
+
+	/* handlers */
+	GWidgetHandlerSelf handler_show;
+};
+
+
+/* public */
+/* functions */
+/* gwidget_new */
+GWidget * gwidget_new(void)
+{
+	GWidget * gwidget;
+
+	if((gwidget = malloc(sizeof(*gwidget))) == NULL)
+		return NULL;
+	gwidget->gwidget = gwidget;
+	gwidget->self = NULL;
+	gwidget->handler_show = NULL;
+	return gwidget;
+}
+
+
+/* gwidget_delete */
+void gwidget_delete(GWidget * gwidget)
+{
+	free(gwidget);
+}
+
+
+/* accessors */
+/* gwidget_set_handler */
+void gwidget_set_handler(GWidget * gwidget, GWidgetHandler handler, ...)
+{
+	va_list ap;
+
+	va_start(ap, handler);
+	switch(handler)
+	{
+		case GWIDGET_HANDLER_SHOW:
+			gwidget->handler_show = va_arg(ap, GWidgetHandlerSelf);
+			break;
+	}
+	va_end(ap);
+}
+
+
+/* gwidget_set_self */
+void gwidget_set_self(GWidget * gwidget, void * self)
+{
+	gwidget->self = self;
+}
+
+
+/* useful */
+/* gwidget_show */
+void gwidget_show(GWidget * gwidget)
+{
+	if(gwidget->gwidget != gwidget)
+		gwidget = gwidget->gwidget;
+	if(gwidget->handler_show != NULL)
+		gwidget->handler_show(gwidget->self);
+}

src/gwindow.c

@@ -32,6 +32,7 @@
 #include <string.h>
 #include "GToolkit/GWidget.h"
 #include "GToolkit/GWindow.h"
+#include "GToolkit.h"
 #include "common.h"
 
 
@@ -40,7 +41,7 @@
 /* types */
 struct _GWindow
 {
-#include "gwidget.h"
+	GWidget * gwidget;
 
 	/* GWindow */
 	char * title;
@@ -56,6 +57,10 @@ struct _GWindow
 };
 
 
+/* prototypes */
+static void _gwindow_show(GWindow * gwindow);
+
+
 /* public */
 /* functions */
 /* gwindow_new */
@@ -69,6 +74,14 @@ GWindow * gwindow_new(void)
 
 	if((gwindow = malloc(sizeof(*gwindow))) == NULL)
 		return NULL; /* FIXME report */
+	if((gwindow->gwidget = gwidget_new()) == NULL)
+	{
+		free(gwindow);
+		return NULL;
+	}
+	gwidget_set_self(gwindow->gwidget, gwindow);
+	gwidget_set_handler(gwindow->gwidget, GWIDGET_HANDLER_SHOW,
+			_gwindow_show);
 	gwindow->title = NULL;
 	gwindow->decorated = true;
 	gwindow->fullscreen = false;
@@ -216,8 +229,10 @@ void gwindow_resize(GWindow * gwindow, int width, int height)
 }
 
 
+/* private */
+/* functions */
 /* gwindow_show */
-void gwindow_show(GWindow * gwindow)
+static void _gwindow_show(GWindow * gwindow)
 	/* FIXME accept flags (focus...) */
 {
 	Display * display;

src/project.conf

@@ -2,7 +2,7 @@ targets=libGToolkit
 cppflags_force=-I ../include
 cflags_force=-W
 cflags=-Wall -fPIC -g -O2 -pedantic
-dist=Makefile,common.h,gwidget.h
+dist=Makefile,common.h
 
 #targets
 [libGToolkit]
@@ -10,11 +10,14 @@ type=library
 cflags=`pkg-config --cflags gl`
 ldflags=`pkg-config --libs gl`
 install=$(PREFIX)/lib
-sources=gtoolkit.c,gwindow.c
+sources=gtoolkit.c,gwidget.c,gwindow.c
 
 #sources
 [gtoolkit.c]
 depends=common.h
 
+[gwidget.c]
+depends=common.h
+
 [gwindow.c]
 depends=common.h

tools/test.c

@@ -40,7 +40,7 @@ int main(void)
 		return 2;
 	window = gwindow_new();
 	gwindow_set_title(window, "Test window");
-	gwindow_show(window);
+	gwidget_show(GWIDGET(window));
 	gtoolkit_main();
 	return 0;
 }