diff -r bb21210e9cac -r d7a7fb79b5f7 ui/motif/range.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/range.c	Wed Jan 27 12:52:39 2016 +0100
@@ -0,0 +1,138 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2016 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 "range.h"
+#include "container.h"
+#include "../../ucx/mempool.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+
+static UIWIDGET ui_scrollbar(UiObject *obj, UiOrientation orientation, UiRange *range, ui_callback f, void *userdata) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    int n = 0;
+    Arg args[16];
+    XtSetArg(args[n], XmNorientation, orientation == UI_HORIZONTAL ? XmHORIZONTAL : XmVERTICAL);
+    n++;
+    XtSetArg (args[n], XmNmaximum, 10);
+    n++;
+    XtSetArg (args[n], XmNsliderSize, 1);
+    n++;
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget scrollbar = XmCreateScrollBar(parent, "scrollbar", args, n);
+    XtManageChild(scrollbar);
+    ct->add(ct, scrollbar);
+    
+    if(range) {
+        range->get = ui_scrollbar_get;
+        range->set = ui_scrollbar_set;
+        range->setrange = ui_scrollbar_setrange;
+        range->setextent = ui_scrollbar_setextent;
+        range->obj = scrollbar;
+    }
+    
+    if(f) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = userdata;
+        event->callback = f;
+        event->value = 0;
+        XtAddCallback(
+                scrollbar,
+                XmNvalueChangedCallback,
+                (XtCallbackProc)ui_scrollbar_callback,
+                event);
+    }
+    
+    return scrollbar;
+}
+
+UIWIDGET ui_hscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata) {
+    return ui_scrollbar(obj, UI_HORIZONTAL, range, f, userdata);
+}
+
+UIWIDGET ui_vscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata) {
+    return ui_scrollbar(obj, UI_VERTICAL, range, f, userdata);
+}
+
+void ui_scrollbar_callback(Widget scrollbar, UiEventData *event, XtPointer cdata) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.intval = event->value;
+    event->callback(&e, event->userdata);
+}
+
+double ui_scrollbar_get(UiRange *range) {
+    int intval;
+    XtVaGetValues(
+            range->obj,
+            XmNvalue,
+            &intval,
+            NULL);
+    double value = (double)intval / 10;
+    range->value = value;
+    return value;
+}
+
+void   ui_scrollbar_set(UiRange *range, double value) {
+    XtVaSetValues(
+            range->obj,
+            XmNvalue,
+            (int)(value * 10),
+            NULL);
+    range->value = value;
+}
+
+void   ui_scrollbar_setrange(UiRange *range, double min, double max) {
+    XtVaSetValues(
+            range->obj,
+            XmNminimum,
+            (int)(min * 10),
+            XmNmaximum,
+            (int)(max * 10),
+            NULL);
+    range->min = min;
+    range->max = max;
+}
+
+void   ui_scrollbar_setextent(UiRange *range, double extent) {
+    XtVaSetValues(
+            range->obj,
+            XmNsliderSize,
+            (int)(extent * 10),
+            NULL);
+    range->extent = extent;
+}