diff -r 2dbc56c2323b -r e2fd132ab781 ui/common/types.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/types.c	Mon Mar 31 20:22:16 2014 +0200
@@ -0,0 +1,142 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../../ucx/list.h"
+#include "types.h"
+
+UiObserver* ui_observer_new(ui_callback f, void *data) {
+    UiObserver *observer = malloc(sizeof(UiObserver));
+    observer->callback = f;
+    observer->data = data;
+    observer->next = NULL;
+    return observer;
+}
+
+UiObserver* ui_obsvlist_add(UiObserver *list, UiObserver *observer) {
+    if(!list) {
+        return observer;
+    } else {
+        UiObserver *l = list;
+        while(l->next) {
+            l = l->next;
+        }
+        l->next = observer;
+        return list;
+    }
+}
+
+UiObserver* ui_add_observer(UiObserver *list, ui_callback f, void *data) {
+    UiObserver *observer = ui_observer_new(f, data);
+    return ui_obsvlist_add(list, observer);
+}
+
+void ui_notify(UiObserver *observer, void *data) {
+    ui_notify_except(observer, NULL, data);
+}
+
+void ui_notify_except(UiObserver *observer, UiObserver *exc, void *data) {
+    while(observer) {
+        if(observer != exc) {
+            observer->callback(data, observer->data);
+        }
+        observer = observer->next;
+    }
+}
+
+/* --------------------------- UiList --------------------------- */
+
+UiList* ui_list_new() {
+    UiList *list = malloc(sizeof(UiList));
+    list->first = ui_list_first;
+    list->next = ui_list_next;
+    list->get = ui_list_get;
+    list->count = ui_list_count;
+    list->observers = NULL;
+    
+    list->data = NULL;
+    list->iter = NULL;
+    
+    return list;
+}
+
+void ui_list_free(UiList *list) {
+    ucx_list_free(list->data);
+    free(list);
+}
+
+void* ui_list_first(UiList *list) {
+    UcxList *elm = list->data;
+    list->iter = elm;
+    return elm ? elm->data : NULL;
+}
+
+void* ui_list_next(UiList *list) {
+    UcxList *elm = list->iter;
+    if(elm) {
+        elm = elm->next;
+        if(elm) {
+            list->iter = elm;
+            return elm->data;
+        }
+    }
+    return NULL;
+}
+
+void* ui_list_get(UiList *list, int i) {
+    UcxList *elm = ucx_list_get(list->data, i);
+    if(elm) {
+        list->iter = elm;
+        return elm->data;
+    } else {
+        return NULL;
+    }
+}
+
+int ui_list_count(UiList *list) {
+    UcxList *elm = list->data;
+    return (int)ucx_list_size(elm);
+}
+
+void ui_list_append(UiList *list, void *data) {
+    list->data = ucx_list_append(list->data, data);
+}
+
+void ui_list_prepend(UiList *list, void *data) {
+    list->data = ucx_list_prepend(list->data, data);
+}
+
+void ui_list_addobsv(UiList *list, ui_callback f, void *data) {
+    list->observers = ui_add_observer(list->observers, f, data);
+}
+
+void ui_list_notify(UiList *list) {
+    ui_notify(list->observers, list);
+}