add return code for some stuff

git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@156 b9cfdab3-6d41-4d17-bbe4-086880011989

doc/index.html

@@ -20,6 +20,9 @@
 <dd>
 	<a href="#Mw_Core_h__MwDispatch">MwDispatch</a>
 </dd>
+<dd>
+	<a href="#Mw_Core_h__MwDispatch2">MwDispatch2</a>
+</dd>
 <dd>
 	<a href="#Mw_Core_h__MwCreateWidget">MwCreateWidget</a>
 </dd>
@@ -317,6 +320,37 @@
 </dd>
 </dl>
 <hr>
+<pre id="Mw_Core_h__MwDispatch2"><code>#define MwDispatch2(x, y)</code></pre>
+<dl>
+<dd>
+	Dispatches the handler of widget class.
+</dd>
+<dt>
+	<img src="warning.gif" alt="warning">
+</dt>
+<dd>
+	Used internally.
+</dd>
+<dt>
+	Parameter <code>x</code>
+</dt>
+<dd>
+	Widget.
+</dd>
+<dt>
+	Parameter <code>y</code>
+</dt>
+<dd>
+	Handler name.
+</dd>
+<dt>
+	Returns
+</dt>
+<dd>
+	<code>0</code> for success, otherwise failed.
+</dd>
+</dl>
+<hr>
 <pre id="Mw_Core_h__MwCreateWidget"><code>MWDECL MwWidget MwCreateWidget (
 	MwClass widget_class,
 	const char* name,

include/Mw/Core.h

@@ -18,6 +18,16 @@
 #define MwDispatch(x, y) \
 	if(x->widget_class != NULL && x->widget_class->y != NULL) x->widget_class->y(x)
 
+/*!
+ * %warning Used internally
+ * %brief Dispatches the handler of widget class
+ * %param x Widget
+ * %param y Handler name
+ * %return `0` for success, otherwise failed
+ */
+#define MwDispatch2(x, y) \
+	((x->widget_class != NULL && x->widget_class->y != NULL) ? x->widget_class->y(x) : 0)
+
 #define MwWaitMS 5
 
 #ifdef __cplusplus

include/Mw/TypeDefs.h

@@ -24,6 +24,7 @@ typedef void* MwWidget;
 typedef void* MwMenu;
 #endif
 typedef void (*MwHandler)(MwWidget handle);
+typedef int (*MwHandler2)(MwWidget handle);
 typedef void (*MwUserHandler)(MwWidget handle, void* user_data, void* call_data);
 typedef void (*MwErrorHandler)(int code, const char* message, void* user_data);
 
@@ -96,11 +97,11 @@ struct _MwMenu {
 #endif
 
 struct _MwClass {
-	MwHandler create;
-	MwHandler destroy;
-	MwHandler draw;
-	MwHandler click;
-	MwHandler parent_resize;
+	MwHandler2 create;
+	MwHandler  destroy;
+	MwHandler  draw;
+	MwHandler  click;
+	MwHandler  parent_resize;
 };
 
 struct _MwFont {

src/core.c

@@ -96,7 +96,11 @@ MwWidget MwCreateWidget(MwClass widget_class, const char* name, MwWidget parent,
 	shdefault(h->handler, NULL);
 	shdefault(h->data, NULL);
 
-	MwDispatch(h, create);
+	if(MwDispatch2(h, create)) {
+		h->widget_class = NULL;
+		MwDestroyWidget(h);
+		return NULL;
+	}
 
 	return h;
 }

src/widget/button.c

@@ -1,8 +1,10 @@
 /* $Id$ */
 #include <Mw/Milsko.h>
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static void draw(MwWidget handle) {

src/widget/frame.c

@@ -1,8 +1,10 @@
 /* $Id$ */
 #include <Mw/Milsko.h>
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static void draw(MwWidget handle) {

src/widget/image.c

@@ -1,8 +1,10 @@
 /* $Id$ */
 #include <Mw/Milsko.h>
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static void draw(MwWidget handle) {

src/widget/menu.c

@@ -25,7 +25,7 @@ static void set_xywh(MwWidget handle) {
 		  NULL);
 }
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	MwMenu m = malloc(sizeof(*m));
 
 	m->name		 = NULL;
@@ -37,6 +37,8 @@ static void create(MwWidget handle) {
 	MwSetDefault(handle);
 
 	set_xywh(handle);
+
+	return 0;
 }
 
 static void recursive_free(MwMenu m) {

src/widget/opengl.c

@@ -49,7 +49,7 @@ typedef struct opengl {
 } opengl_t;
 #endif
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	opengl_t* o = malloc(sizeof(*o));
 #ifdef _WIN32
 	PIXELFORMATDESCRIPTOR pfd;
@@ -107,6 +107,8 @@ static void create(MwWidget handle) {
 	handle->lowlevel->copy_buffer = 0;
 
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static void destroy(MwWidget handle) {

src/widget/submenu.c

@@ -3,13 +3,15 @@
 
 #include "../external/stb_ds.h"
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 #ifdef _WIN32
 #else
 	XUnmapWindow(handle->lowlevel->display, handle->lowlevel->window);
 #endif
 
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static void null_all(MwMenu menu) {

src/widget/vulkan.c

@@ -117,30 +117,32 @@ static MwErrorEnum vulkan_instance_setup(MwWidget handle, vulkan_t* o);
 static MwErrorEnum vulkan_surface_setup(MwWidget handle, vulkan_t* o);
 static MwErrorEnum vulkan_devices_setup(MwWidget handle, vulkan_t* o);
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	vulkan_t*   o = malloc(sizeof(*o));
 	MwErrorEnum err;
 
 	err = vulkan_instance_setup(handle, o);
 	if(err != MwEsuccess) {
 		printf("%s", MwGetLastError());
-		return;
+		return 1;
 	}
 	err = vulkan_surface_setup(handle, o);
 	if(err != MwEsuccess) {
 		printf("%s", MwGetLastError());
-		return;
+		return 1;
 	}
 	err = vulkan_devices_setup(handle, o);
 	if(err != MwEsuccess) {
 		printf("%s", MwGetLastError());
-		return;
+		return 1;
 	}
 
 	handle->lowlevel->copy_buffer = 0;
 
 	handle->internal = o;
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static MwErrorEnum _destroy(MwWidget handle) {

src/widget/window.c

@@ -1,8 +1,10 @@
 /* $Id$ */
 #include <Mw/Milsko.h>
 
-static void create(MwWidget handle) {
+static int create(MwWidget handle) {
 	MwSetDefault(handle);
+
+	return 0;
 }
 
 static void draw(MwWidget handle) {