Index: uspace/lib/ui/meson.build
===================================================================
--- uspace/lib/ui/meson.build	(revision 71edd43039dc4e127878007d819eaba2641ad794)
+++ uspace/lib/ui/meson.build	(revision 5ef85c0bd5ee99c810fd320afd396bede779e6f0)
@@ -75,4 +75,5 @@
 	'test/rbutton.c',
 	'test/resource.c',
+	'test/scrollbar.c',
 	'test/slider.c',
 	'test/ui.c',
Index: uspace/lib/ui/src/scrollbar.c
===================================================================
--- uspace/lib/ui/src/scrollbar.c	(revision 71edd43039dc4e127878007d819eaba2641ad794)
+++ uspace/lib/ui/src/scrollbar.c	(revision 5ef85c0bd5ee99c810fd320afd396bede779e6f0)
@@ -49,9 +49,4 @@
 #include "../private/scrollbar.h"
 
-/*
- * The kind reader will appreciate that scrollbar thumb dimensions 23:15
- * are chosen such that, after subtracting the frame width (2 times 1),
- * we get 21:13, which is a good approximation of the golden ratio.
- */
 enum {
 	/** Scrollbar button width */
@@ -471,4 +466,8 @@
 	w = scrollbar->rect.p1.x - scrollbar->rect.p0.x -
 	    2 * ui_scrollbar_btn_len_text;
+	assert(w >= 0);
+	if (w < 0)
+		return EINVAL;
+
 	gchar = "\u2592";
 	gcharsz = str_size(gchar);
Index: uspace/lib/ui/test/main.c
===================================================================
--- uspace/lib/ui/test/main.c	(revision 71edd43039dc4e127878007d819eaba2641ad794)
+++ uspace/lib/ui/test/main.c	(revision 5ef85c0bd5ee99c810fd320afd396bede779e6f0)
@@ -48,4 +48,5 @@
 PCUT_IMPORT(rbutton);
 PCUT_IMPORT(resource);
+PCUT_IMPORT(scrollbar);
 PCUT_IMPORT(slider);
 PCUT_IMPORT(ui);
Index: uspace/lib/ui/test/scrollbar.c
===================================================================
--- uspace/lib/ui/test/scrollbar.c	(revision 5ef85c0bd5ee99c810fd320afd396bede779e6f0)
+++ uspace/lib/ui/test/scrollbar.c	(revision 5ef85c0bd5ee99c810fd320afd396bede779e6f0)
@@ -0,0 +1,1004 @@
+/*
+ * Copyright (c) 2022 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <gfx/context.h>
+#include <gfx/coord.h>
+#include <mem.h>
+#include <pcut/pcut.h>
+#include <stdbool.h>
+#include <ui/control.h>
+#include <ui/scrollbar.h>
+#include <ui/resource.h>
+#include "../private/pbutton.h"
+#include "../private/scrollbar.h"
+
+PCUT_INIT;
+
+PCUT_TEST_SUITE(scrollbar);
+
+static errno_t testgc_set_clip_rect(void *, gfx_rect_t *);
+static errno_t testgc_set_color(void *, gfx_color_t *);
+static errno_t testgc_fill_rect(void *, gfx_rect_t *);
+static errno_t testgc_update(void *);
+static errno_t testgc_bitmap_create(void *, gfx_bitmap_params_t *,
+    gfx_bitmap_alloc_t *, void **);
+static errno_t testgc_bitmap_destroy(void *);
+static errno_t testgc_bitmap_render(void *, gfx_rect_t *, gfx_coord2_t *);
+static errno_t testgc_bitmap_get_alloc(void *, gfx_bitmap_alloc_t *);
+
+static gfx_context_ops_t ops = {
+	.set_clip_rect = testgc_set_clip_rect,
+	.set_color = testgc_set_color,
+	.fill_rect = testgc_fill_rect,
+	.update = testgc_update,
+	.bitmap_create = testgc_bitmap_create,
+	.bitmap_destroy = testgc_bitmap_destroy,
+	.bitmap_render = testgc_bitmap_render,
+	.bitmap_get_alloc = testgc_bitmap_get_alloc
+};
+
+static void test_scrollbar_up(ui_scrollbar_t *, void *);
+static void test_scrollbar_down(ui_scrollbar_t *, void *);
+static void test_scrollbar_moved(ui_scrollbar_t *, void *, gfx_coord_t);
+
+static ui_scrollbar_cb_t test_scrollbar_cb = {
+	.up = test_scrollbar_up,
+	.down = test_scrollbar_down,
+	.moved = test_scrollbar_moved
+};
+
+static ui_scrollbar_cb_t dummy_scrollbar_cb = {
+};
+
+typedef struct {
+	bool bm_created;
+	bool bm_destroyed;
+	gfx_bitmap_params_t bm_params;
+	void *bm_pixels;
+	gfx_rect_t bm_srect;
+	gfx_coord2_t bm_offs;
+	bool bm_rendered;
+	bool bm_got_alloc;
+} test_gc_t;
+
+typedef struct {
+	test_gc_t *tgc;
+	gfx_bitmap_alloc_t alloc;
+	bool myalloc;
+} testgc_bitmap_t;
+
+typedef struct {
+	bool up;
+	bool down;
+	bool moved;
+	gfx_coord_t pos;
+} test_cb_resp_t;
+
+/** Create and destroy scrollbar */
+PCUT_TEST(create_destroy)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar = NULL;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(scrollbar);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_destroy() can take NULL argument (no-op) */
+PCUT_TEST(destroy_null)
+{
+	ui_scrollbar_destroy(NULL);
+}
+
+/** ui_scrollbar_ctl() returns control that has a working virtual destructor */
+PCUT_TEST(ctl)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar = NULL;
+	ui_control_t *control;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(scrollbar);
+
+	control = ui_scrollbar_ctl(scrollbar);
+	PCUT_ASSERT_NOT_NULL(control);
+
+	ui_control_destroy(control);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** Set scrollbar rectangle sets internal field */
+PCUT_TEST(set_rect)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar = NULL;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(scrollbar);
+
+	rect.p0.x = 1;
+	rect.p0.y = 2;
+	rect.p1.x = 3;
+	rect.p1.y = 4;
+
+	ui_scrollbar_set_rect(scrollbar, &rect);
+	PCUT_ASSERT_INT_EQUALS(rect.p0.x, scrollbar->rect.p0.x);
+	PCUT_ASSERT_INT_EQUALS(rect.p0.y, scrollbar->rect.p0.y);
+	PCUT_ASSERT_INT_EQUALS(rect.p1.x, scrollbar->rect.p1.x);
+	PCUT_ASSERT_INT_EQUALS(rect.p1.y, scrollbar->rect.p1.y);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** Paint scrollbar in graphics mode */
+PCUT_TEST(paint_gfx)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_scrollbar_paint_gfx(scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** Paint scrollbar in text mode */
+PCUT_TEST(paint_text)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, true, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rect.p0.x = 1;
+	rect.p0.y = 1;
+	rect.p1.x = 10;
+	rect.p1.y = 2;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	rc = ui_scrollbar_paint_text(scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_through_length() gives correct scrollbar through length */
+PCUT_TEST(through_length)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	gfx_coord_t length;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	length = ui_scrollbar_through_length(scrollbar);
+
+	/* Total length minus buttons */
+	PCUT_ASSERT_INT_EQUALS(110 - 10 - 2 * 20, length);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_move_length() gives correct scrollbar move length */
+PCUT_TEST(move_length)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	gfx_coord_t length;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	length = ui_scrollbar_move_length(scrollbar);
+
+	/* Total length minus buttons minus default thumb length */
+	PCUT_ASSERT_INT_EQUALS(110 - 10 - 2 * 20 - 20, length);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_get_pos() returns scrollbar position */
+PCUT_TEST(get_pos)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	gfx_coord_t pos;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	scrollbar->pos = 42;
+	pos = ui_scrollbar_get_pos(scrollbar);
+	PCUT_ASSERT_INT_EQUALS(42, pos);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_set_thumb_length() sets thumb length */
+PCUT_TEST(set_thumb_length)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	ui_scrollbar_set_thumb_length(scrollbar, 42);
+	PCUT_ASSERT_INT_EQUALS(42, scrollbar->thumb_len);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_set_pos() sets thumb position */
+PCUT_TEST(set_pos)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	gfx_coord_t pos;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	ui_scrollbar_set_pos(scrollbar, -1);
+	pos = ui_scrollbar_get_pos(scrollbar);
+	/* The value is clipped to the minimum possible position (0) */
+	PCUT_ASSERT_INT_EQUALS(0, pos);
+
+	ui_scrollbar_set_pos(scrollbar, 12);
+	pos = ui_scrollbar_get_pos(scrollbar);
+	/* The value is set to the requested value */
+	PCUT_ASSERT_INT_EQUALS(12, pos);
+
+	ui_scrollbar_set_pos(scrollbar, 42);
+	pos = ui_scrollbar_get_pos(scrollbar);
+	/* The value is clipped to the maximum possible position (40) */
+	PCUT_ASSERT_INT_EQUALS(40, pos);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** Press and release scrollbar */
+PCUT_TEST(press_release)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	gfx_coord2_t pos;
+	gfx_rect_t rect;
+	ui_scrollbar_t *scrollbar;
+	test_cb_resp_t resp;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	resp.moved = false;
+	ui_scrollbar_set_cb(scrollbar, &test_scrollbar_cb, &resp);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	pos.x = 11;
+	pos.y = 22;
+
+	ui_scrollbar_press(scrollbar, &pos);
+	PCUT_ASSERT_TRUE(scrollbar->held);
+	PCUT_ASSERT_FALSE(resp.moved);
+
+	pos.x = 21;
+	pos.y = 32;
+
+	ui_scrollbar_release(scrollbar, &pos);
+	PCUT_ASSERT_FALSE(scrollbar->held);
+	PCUT_ASSERT_TRUE(resp.moved);
+	PCUT_ASSERT_INT_EQUALS(10, scrollbar->pos);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** Press, update and release scrollbar */
+PCUT_TEST(press_uodate_release)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	gfx_coord2_t pos;
+	gfx_rect_t rect;
+	ui_scrollbar_t *scrollbar;
+	test_cb_resp_t resp;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rect.p0.x = 10;
+	rect.p0.y = 20;
+	rect.p1.x = 110;
+	rect.p1.y = 120;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	resp.moved = false;
+	ui_scrollbar_set_cb(scrollbar, &test_scrollbar_cb, &resp);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	pos.x = 11;
+	pos.y = 22;
+
+	ui_scrollbar_press(scrollbar, &pos);
+	PCUT_ASSERT_TRUE(scrollbar->held);
+	PCUT_ASSERT_FALSE(resp.moved);
+
+	pos.x = 21;
+	pos.y = 32;
+
+	ui_scrollbar_update(scrollbar, &pos);
+	PCUT_ASSERT_TRUE(scrollbar->held);
+	PCUT_ASSERT_TRUE(resp.moved);
+	PCUT_ASSERT_INT_EQUALS(10, scrollbar->pos);
+
+	pos.x = 31;
+	pos.y = 42;
+
+	ui_scrollbar_release(scrollbar, &pos);
+	PCUT_ASSERT_FALSE(scrollbar->held);
+	PCUT_ASSERT_TRUE(resp.moved);
+	PCUT_ASSERT_INT_EQUALS(20, scrollbar->pos);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_up() delivers up event */
+PCUT_TEST(up)
+{
+	ui_scrollbar_t *scrollbar;
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	test_cb_resp_t resp;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	/* Up with no callbacks set */
+	ui_scrollbar_up(scrollbar);
+
+	/* Up with callback not implementing up */
+	ui_scrollbar_set_cb(scrollbar, &dummy_scrollbar_cb, NULL);
+	ui_scrollbar_up(scrollbar);
+
+	/* Up with real callback set */
+	resp.up = false;
+	ui_scrollbar_set_cb(scrollbar, &test_scrollbar_cb, &resp);
+	ui_scrollbar_up(scrollbar);
+	PCUT_ASSERT_TRUE(resp.up);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_down() delivers down event */
+PCUT_TEST(down)
+{
+	ui_scrollbar_t *scrollbar;
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	test_cb_resp_t resp;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	/* Down with no callbacks set */
+	ui_scrollbar_down(scrollbar);
+
+	/* Down with callback not implementing down */
+	ui_scrollbar_set_cb(scrollbar, &dummy_scrollbar_cb, NULL);
+	ui_scrollbar_down(scrollbar);
+
+	/* Down with real callback set */
+	resp.down = false;
+	ui_scrollbar_set_cb(scrollbar, &test_scrollbar_cb, &resp);
+	ui_scrollbar_down(scrollbar);
+	PCUT_ASSERT_TRUE(resp.down);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_moved() delivers moved event */
+PCUT_TEST(moved)
+{
+	ui_scrollbar_t *scrollbar;
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	test_cb_resp_t resp;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	/* Moved with no callbacks set */
+	ui_scrollbar_moved(scrollbar, 42);
+
+	/* Moved with callback not implementing moved */
+	ui_scrollbar_set_cb(scrollbar, &dummy_scrollbar_cb, NULL);
+	ui_scrollbar_moved(scrollbar, 42);
+
+	/* Moved with real callback set */
+	resp.moved = false;
+	resp.pos = 0;
+	ui_scrollbar_set_cb(scrollbar, &test_scrollbar_cb, &resp);
+	ui_scrollbar_moved(scrollbar, 42);
+	PCUT_ASSERT_TRUE(resp.moved);
+	PCUT_ASSERT_INT_EQUALS(42, resp.pos);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_pos_event() detects thumb press/release */
+PCUT_TEST(pos_event_press_release_thumb)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	ui_evclaim_t claim;
+	pos_event_t event;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 20;
+	rect.p0.y = 10;
+	rect.p1.x = 100;
+	rect.p1.y = 30;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	/* Press outside is not claimed and does nothing */
+	event.type = POS_PRESS;
+	event.hpos = 1;
+	event.vpos = 2;
+	claim = ui_scrollbar_pos_event(scrollbar, &event);
+	PCUT_ASSERT_FALSE(scrollbar->held);
+	PCUT_ASSERT_EQUALS(ui_unclaimed, claim);
+
+	/* Press inside thumb is claimed and depresses it */
+	event.type = POS_PRESS;
+	event.hpos = 50;
+	event.vpos = 20;
+	claim = ui_scrollbar_pos_event(scrollbar, &event);
+	PCUT_ASSERT_TRUE(scrollbar->held);
+	PCUT_ASSERT_EQUALS(ui_claimed, claim);
+
+	/* Release outside (or anywhere) is claimed and relases thumb */
+	event.type = POS_RELEASE;
+	event.hpos = 41;
+	event.vpos = 32;
+	claim = ui_scrollbar_pos_event(scrollbar, &event);
+	PCUT_ASSERT_FALSE(scrollbar->held);
+	PCUT_ASSERT_EQUALS(ui_claimed, claim);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_pos_event() detects up button press/release */
+PCUT_TEST(pos_event_press_release_up_btn)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	ui_evclaim_t claim;
+	pos_event_t event;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 20;
+	rect.p0.y = 10;
+	rect.p1.x = 100;
+	rect.p1.y = 30;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	/* Press inside up button is claimed and depresses it */
+	event.type = POS_PRESS;
+	event.hpos = 30;
+	event.vpos = 20;
+	claim = ui_scrollbar_pos_event(scrollbar, &event);
+	PCUT_ASSERT_TRUE(scrollbar->btn_up->held);
+	PCUT_ASSERT_EQUALS(ui_claimed, claim);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+/** ui_scrollbar_pos_event() detects down button press/release */
+PCUT_TEST(pos_event_press_relese_down_btn)
+{
+	errno_t rc;
+	gfx_context_t *gc = NULL;
+	test_gc_t tgc;
+	ui_resource_t *resource = NULL;
+	ui_scrollbar_t *scrollbar;
+	ui_evclaim_t claim;
+	pos_event_t event;
+	gfx_rect_t rect;
+
+	memset(&tgc, 0, sizeof(tgc));
+	rc = gfx_context_new(&ops, &tgc, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ui_resource_create(gc, false, &resource);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_NOT_NULL(resource);
+
+	rc = ui_scrollbar_create(resource, &scrollbar);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_FALSE(scrollbar->held);
+
+	rect.p0.x = 20;
+	rect.p0.y = 10;
+	rect.p1.x = 100;
+	rect.p1.y = 30;
+	ui_scrollbar_set_rect(scrollbar, &rect);
+
+	/* Press inside down button is claimed and depresses it */
+	event.type = POS_PRESS;
+	event.hpos = 90;
+	event.vpos = 20;
+	claim = ui_scrollbar_pos_event(scrollbar, &event);
+	PCUT_ASSERT_TRUE(scrollbar->btn_down->held);
+	PCUT_ASSERT_EQUALS(ui_claimed, claim);
+
+	ui_scrollbar_destroy(scrollbar);
+	ui_resource_destroy(resource);
+
+	rc = gfx_context_delete(gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+}
+
+static errno_t testgc_set_clip_rect(void *arg, gfx_rect_t *rect)
+{
+	(void) arg;
+	(void) rect;
+	return EOK;
+}
+
+static errno_t testgc_set_color(void *arg, gfx_color_t *color)
+{
+	(void) arg;
+	(void) color;
+	return EOK;
+}
+
+static errno_t testgc_fill_rect(void *arg, gfx_rect_t *rect)
+{
+	(void) arg;
+	(void) rect;
+	return EOK;
+}
+
+static errno_t testgc_update(void *arg)
+{
+	(void) arg;
+	return EOK;
+}
+
+static errno_t testgc_bitmap_create(void *arg, gfx_bitmap_params_t *params,
+    gfx_bitmap_alloc_t *alloc, void **rbm)
+{
+	test_gc_t *tgc = (test_gc_t *) arg;
+	testgc_bitmap_t *tbm;
+
+	tbm = calloc(1, sizeof(testgc_bitmap_t));
+	if (tbm == NULL)
+		return ENOMEM;
+
+	if (alloc == NULL) {
+		tbm->alloc.pitch = (params->rect.p1.x - params->rect.p0.x) *
+		    sizeof(uint32_t);
+		tbm->alloc.off0 = 0;
+		tbm->alloc.pixels = calloc(sizeof(uint32_t),
+		    (params->rect.p1.x - params->rect.p0.x) *
+		    (params->rect.p1.y - params->rect.p0.y));
+		tbm->myalloc = true;
+		if (tbm->alloc.pixels == NULL) {
+			free(tbm);
+			return ENOMEM;
+		}
+	} else {
+		tbm->alloc = *alloc;
+	}
+
+	tbm->tgc = tgc;
+	tgc->bm_created = true;
+	tgc->bm_params = *params;
+	tgc->bm_pixels = tbm->alloc.pixels;
+	*rbm = (void *)tbm;
+	return EOK;
+}
+
+static errno_t testgc_bitmap_destroy(void *bm)
+{
+	testgc_bitmap_t *tbm = (testgc_bitmap_t *)bm;
+	if (tbm->myalloc)
+		free(tbm->alloc.pixels);
+	tbm->tgc->bm_destroyed = true;
+	free(tbm);
+	return EOK;
+}
+
+static errno_t testgc_bitmap_render(void *bm, gfx_rect_t *srect,
+    gfx_coord2_t *offs)
+{
+	testgc_bitmap_t *tbm = (testgc_bitmap_t *)bm;
+
+	tbm->tgc->bm_rendered = true;
+	if (srect != NULL)
+		tbm->tgc->bm_srect = *srect;
+	if (offs != NULL)
+		tbm->tgc->bm_offs = *offs;
+	return EOK;
+}
+
+static errno_t testgc_bitmap_get_alloc(void *bm, gfx_bitmap_alloc_t *alloc)
+{
+	testgc_bitmap_t *tbm = (testgc_bitmap_t *)bm;
+	*alloc = tbm->alloc;
+	tbm->tgc->bm_got_alloc = true;
+	return EOK;
+}
+
+static void test_scrollbar_up(ui_scrollbar_t *scrollbar, void *arg)
+{
+	test_cb_resp_t *resp = (test_cb_resp_t *) arg;
+
+	resp->up = true;
+}
+
+static void test_scrollbar_down(ui_scrollbar_t *scrollbar, void *arg)
+{
+	test_cb_resp_t *resp = (test_cb_resp_t *) arg;
+
+	resp->down = true;
+}
+
+static void test_scrollbar_moved(ui_scrollbar_t *scrollbar, void *arg, gfx_coord_t pos)
+{
+	test_cb_resp_t *resp = (test_cb_resp_t *) arg;
+
+	resp->moved = true;
+	resp->pos = pos;
+}
+
+PCUT_EXPORT(scrollbar);
Index: uspace/lib/ui/test/slider.c
===================================================================
--- uspace/lib/ui/test/slider.c	(revision 71edd43039dc4e127878007d819eaba2641ad794)
+++ uspace/lib/ui/test/slider.c	(revision 5ef85c0bd5ee99c810fd320afd396bede779e6f0)
@@ -1,4 +1,4 @@
 /*
- * Copyright (c) 2021 Jiri Svoboda
+ * Copyright (c) 2022 Jiri Svoboda
  * All rights reserved.
  *
@@ -225,5 +225,5 @@
 	ui_slider_moved(slider, 42);
 
-	/* Moved with callback not implementing clicked */
+	/* Moved with callback not implementing moved */
 	ui_slider_set_cb(slider, &dummy_slider_cb, NULL);
 	ui_slider_moved(slider, 42);