diff -r 9a5f47fbc5c3 -r 458831c574f4 ui/gtk/tree.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/tree.c	Sat May 10 15:43:22 2014 +0200
@@ -0,0 +1,158 @@
+/*
+ * 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 <string.h>
+
+#include "../common/context.h"
+#include "../common/object.h"
+#include "container.h"
+
+#include "tree.h"
+
+
+void* ui_strmodel_getvalue(void *elm, int column) {
+    return column == 0 ? elm : NULL;
+}
+
+
+UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
+    return ui_listview(obj, list, ui_strmodel_getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_var(UiObject *obj, UiListPtr *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    // create treeview
+    GtkWidget *view = gtk_tree_view_new();
+    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
+    GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(NULL, renderer, "text", 0, NULL);
+    gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
+    
+    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
+#ifdef UI_GTK3
+    gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
+#else
+    
+#endif
+    
+    UiListModel *model = ui_list_model_new(list, getvalue);
+    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(model));
+    
+    // add TreeView as observer to the UiList to update the TreeView if the
+    // data changes
+    UiListView *listview = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListView));
+    listview->widget = view;
+    listview->list = list;
+    listview->getvalue = getvalue;
+    list->list->observers = ui_add_observer(
+            list->list->observers,
+            (ui_callback)ui_listview_update,
+            listview);
+    
+    // add callback
+    if(f) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->user_data = udata;
+        event->callback = f;
+        event->value = 0;
+
+        g_signal_connect(
+                view,
+                "row-activated",
+                G_CALLBACK(ui_listview_selected),
+                event);
+    }
+    
+    // add widget to the current container
+    GtkWidget *scroll_area = gtk_scrolled_window_new(NULL, NULL);
+    gtk_scrolled_window_set_policy(
+            GTK_SCROLLED_WINDOW(scroll_area),
+            GTK_POLICY_AUTOMATIC,
+            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
+    gtk_container_add(GTK_CONTAINER(scroll_area), view);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, scroll_area);
+    
+    return scroll_area;
+}
+
+UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiListPtr *listptr = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListPtr));
+    listptr->list = list;
+    return ui_listview_var(obj, listptr, getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        UiListVar *value = var->value;
+        return ui_listview_var(obj, value->listptr, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+
+void ui_listview_update(UiEvent *event, UiListView *view) {
+    UiList *list = view->list->list;
+    
+    UiListModel *model = ui_list_model_new(view->list, view->getvalue);
+    gtk_tree_view_set_model(GTK_TREE_VIEW(view->widget), GTK_TREE_MODEL(model));   
+}
+
+void ui_listview_selected(
+        GtkTreeView *treeview,
+        GtkTreePath *path,
+        GtkTreeViewColumn *column,
+        UiEventData *event)
+{
+    int *indices = gtk_tree_path_get_indices(path);
+    int depth = gtk_tree_path_get_depth(path);
+    if(depth == 0) {
+        fprintf(stderr, "UiError: ui_treeview_selected: depth == 0\n");
+        return;
+    }
+    GtkTreeModel *model = gtk_tree_view_get_model(treeview);
+    GtkTreeIter iter;
+    gtk_tree_model_get_iter (model, &iter, path);
+    void *value = NULL;
+    gtk_tree_model_get(model, &iter, 0, &value, -1);
+    
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->document;
+    e.eventdata = value;
+    e.intval = indices[depth-1];
+    event->callback(&e, event->user_data);
+}