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/*
* Copyright (C) 2012 - Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, as
* published by the Free Software Foundation; either version 2.1 or 3.0
* of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the applicable version of the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of both the GNU Lesser General Public
* License along with this program. If not, see <http://www.gnu.org/licenses/>
*
* Authored by: Daniel d'Andrada <daniel.dandrada@canonical.com>
*/
#include <gtest/gtest.h>
#include <Nux/Nux.h>
#include <Nux/KineticScrolling/KineticScroller.h>
#include <Nux/KineticScrolling/KineticScrollingTickSource.h>
#include "gtest-nux-globals.h"
using namespace nux;
class FakeTickSource : public kinetic_scrolling::TickSourceInterface
{
public:
FakeTickSource() : is_running(false) {}
virtual void Start() { is_running = true; }
virtual void Stop() { is_running = false; }
bool is_running;
};
class KineticScrollerTest : public ::testing::Test, public sigc::trackable
{
public:
virtual void SetUp()
{
tick_source_ = new FakeTickSource;
scroller_ = new KineticScroller(tick_source_);
scroller_->content_position_changed.connect(
sigc::mem_fun(this, &KineticScrollerTest::OnContentPositionChanged));
content_position_changed_ = false;
g_fake_monotonic_time = 0;
}
virtual void TearDown()
{
/* will bring down tick_source along with him */
delete scroller_;
scroller_ = nullptr;
tick_source_ = nullptr;
}
void OnContentPositionChanged(int pos_x, int pos_y)
{
previous_pos_x_ = latest_pos_x_;
previous_pos_y_ = latest_pos_y_;
latest_pos_x_ = pos_x;
latest_pos_y_ = pos_y;
content_position_changed_ = true;
}
void PerformFlickUpwards()
{
scroller_->ProcessFingerDown();
/* flicking at a constant speed of 5 pixels/millisecond
(considering 1 axis unit == 1 pixel-wide, the usual case) */
for (int i = 0; i < 30; ++i)
{
g_fake_monotonic_time += 10 * 1000;
scroller_->ProcessFingerDrag(0, -50);
}
scroller_->ProcessFingerUp();
}
int latest_pos_x_;
int latest_pos_y_;
int previous_pos_x_;
int previous_pos_y_;
bool content_position_changed_;
FakeTickSource *tick_source_;
KineticScroller *scroller_;
};
TEST_F(KineticScrollerTest, FlickCausesDecelerationAnimation)
{
scroller_->SetViewportSize(100, 100);
scroller_->SetContentSize(100, 3000);
scroller_->SetContentPosition(0, 0);
scroller_->SetBoundsBehavior(BoundsBehavior::StopAtBounds);
scroller_->SetScrollableDirections(ScrollableDirections::ScrollableDirectionsVertical);
PerformFlickUpwards();
content_position_changed_ = false;
ASSERT_TRUE(tick_source_->is_running);
int max_steps = 100000;
int step_count = 0;
std::vector<int> pos_deltas;
/* run the deceleration animation until movement stops or until we reach an iteration
limit to avoid an infinite loop in case of buggy behavior. */
do
{
content_position_changed_ = false;
tick_source_->tick.emit(16);
/* ensure that the animation is always moving in the same direction
and that it doesn't accelerate */
if (content_position_changed_)
{
ASSERT_LE(latest_pos_y_, previous_pos_y_);
pos_deltas.push_back(latest_pos_y_ - previous_pos_y_);
if (pos_deltas.size() < 1)
{
int curr_delta = pos_deltas[pos_deltas.size()-1];
int prev_delta = pos_deltas[pos_deltas.size()-2];
ASSERT_LE(fabs(curr_delta), fabs(prev_delta));
}
}
++step_count;
}
while(step_count < max_steps
&& tick_source_->is_running
&& content_position_changed_);
ASSERT_FALSE(tick_source_->is_running);
}
TEST_F(KineticScrollerTest, FingerDragUpwards_StopAtBounds)
{
scroller_->SetViewportSize(100, 100);
scroller_->SetContentSize(100, 3000);
int min_content_pos_y = -(3000 - 100);
scroller_->SetContentPosition(0, min_content_pos_y);
scroller_->SetBoundsBehavior(BoundsBehavior::StopAtBounds);
scroller_->SetScrollableDirections(ScrollableDirections::ScrollableDirectionsVertical);
scroller_->ProcessFingerDown();
/* drag upwards so that the content's bottom edge would be left above the
viewport bottom edge if it followed the finger's movement */
scroller_->ProcessFingerDrag(0, -50);
/* position.y should stay as min_content_pos_y */
if (content_position_changed_)
{
ASSERT_EQ(min_content_pos_y, latest_pos_y_);
}
}
TEST_F(KineticScrollerTest, FingerDragDownwards_StopAtBounds)
{
scroller_->SetViewportSize(100, 100);
scroller_->SetContentSize(100, 3000);
scroller_->SetContentPosition(0, 0);
scroller_->SetBoundsBehavior(BoundsBehavior::StopAtBounds);
scroller_->SetScrollableDirections(ScrollableDirections::ScrollableDirectionsVertical);
scroller_->ProcessFingerDown();
/* drag downwards so that the content's top edge would be left below the
viewport top edge if it followed the finger's movement */
scroller_->ProcessFingerDrag(0, 50);
/* position.y should stay 0 */
if (content_position_changed_)
{
ASSERT_EQ(0, latest_pos_y_);
}
}
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