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/*
* Copyright (C) 2024 Igalia S.L.
*
* 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 "config.h"
#include "WPEGestureDetector.h"
#include "WPEDisplay.h"
#include "WPESettings.h"
#include <cmath>
namespace WPE {
void GestureDetector::handleEvent(WPEEvent* event)
{
if (m_sequenceId && *m_sequenceId != wpe_event_touch_get_sequence_id(event))
return;
switch (wpe_event_get_event_type(event)) {
case WPE_EVENT_TOUCH_DOWN:
reset();
if (double x, y; wpe_event_get_position(event, &x, &y)) {
m_gesture = WPE_GESTURE_TAP;
m_position = { x, y };
m_sequenceId = wpe_event_touch_get_sequence_id(event);
}
break;
case WPE_EVENT_TOUCH_CANCEL:
reset();
break;
case WPE_EVENT_TOUCH_MOVE:
if (double x, y; wpe_event_get_position(event, &x, &y) && m_position) {
auto* settings = wpe_display_get_settings(wpe_view_get_display(wpe_event_get_view(event)));
auto dragActivationThresholdPx = wpe_settings_get_uint32(settings, WPE_SETTING_DRAG_THRESHOLD, nullptr);
if (m_gesture != WPE_GESTURE_DRAG && std::hypot(x - m_position->x, y - m_position->y) > dragActivationThresholdPx) {
m_gesture = WPE_GESTURE_DRAG;
m_nextDeltaReferencePosition = m_position;
m_dragBegin = true;
} else if (m_gesture == WPE_GESTURE_DRAG)
m_dragBegin = false;
if (m_gesture == WPE_GESTURE_DRAG) {
m_delta = { x - m_nextDeltaReferencePosition->x, y - m_nextDeltaReferencePosition->y };
m_nextDeltaReferencePosition = { x, y };
}
} else
reset();
break;
case WPE_EVENT_TOUCH_UP:
if (double x, y; wpe_event_get_position(event, &x, &y) && m_position) {
if (m_gesture == WPE_GESTURE_DRAG)
m_delta = { x - m_nextDeltaReferencePosition->x, y - m_nextDeltaReferencePosition->y };
} else
reset();
m_sequenceId = std::nullopt; // We can accept new sequence at this point.
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
void GestureDetector::reset()
{
m_gesture = WPE_GESTURE_NONE;
m_sequenceId = std::nullopt;
m_position = std::nullopt;
m_nextDeltaReferencePosition = std::nullopt;
m_delta = std::nullopt;
m_dragBegin = std::nullopt;
}
} // namespace WPE
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