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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "timelinezoomcontrol.h"
#include <utils/qtcassert.h>
namespace Timeline {
TimelineZoomControl::TimelineZoomControl(QObject *parent) : QObject(parent),
m_traceStart(-1), m_traceEnd(-1), m_windowStart(-1), m_windowEnd(-1),
m_rangeStart(-1), m_rangeEnd(-1), m_selectionStart(-1), m_selectionEnd(-1),
m_windowLocked(false)
{
connect(&m_timer, &QTimer::timeout, this, &TimelineZoomControl::moveWindow);
}
void TimelineZoomControl::clear()
{
bool changeTrace = (m_traceStart != -1 || m_traceEnd != -1);
bool changeWindow = (m_windowStart != -1 || m_windowEnd != -1);
bool changeRange = (m_rangeStart != -1 || m_rangeEnd != -1);
setWindowLocked(false);
if (changeWindow && !m_timer.isActive())
emit windowMovingChanged(true);
m_traceStart = m_traceEnd = m_windowStart = m_windowEnd = m_rangeStart = m_rangeEnd = -1;
if (changeTrace)
emit traceChanged(-1, -1);
if (changeWindow) {
emit windowChanged(-1, -1);
m_timer.stop();
emit windowMovingChanged(false);
} else {
QTC_ASSERT(!m_timer.isActive(), m_timer.stop());
}
if (changeRange)
emit rangeChanged(-1, -1);
setSelection(-1, -1);
}
void TimelineZoomControl::setTrace(qint64 start, qint64 end)
{
Q_ASSERT(start <= end);
if (start != m_traceStart || end != m_traceEnd) {
m_traceStart = start;
m_traceEnd = end;
emit traceChanged(start, end);
rebuildWindow();
}
}
void TimelineZoomControl::setRange(qint64 start, qint64 end)
{
Q_ASSERT(start <= end);
if (m_rangeStart != start || m_rangeEnd != end) {
if (m_timer.isActive()) {
m_timer.stop();
emit windowMovingChanged(false);
}
m_rangeStart = start;
m_rangeEnd = end;
rebuildWindow();
if (m_rangeStart == start && m_rangeEnd == end)
emit rangeChanged(m_rangeStart, m_rangeEnd);
// otherwise rebuildWindow() has changed it again.
}
}
void TimelineZoomControl::setSelection(qint64 start, qint64 end)
{
if (m_selectionStart != start || m_selectionEnd != end) {
m_selectionStart = start;
m_selectionEnd = end;
emit selectionChanged(start, end);
}
}
void TimelineZoomControl::setWindowLocked(bool windowLocked)
{
if (windowLocked != m_windowLocked) {
m_windowLocked = windowLocked;
emit windowLockedChanged(windowLocked);
}
}
void TimelineZoomControl::rebuildWindow()
{
qint64 minDuration = 1; // qMax needs equal data types, so literal 1 won't do
qint64 shownDuration = qMax(rangeDuration(), minDuration);
qint64 oldWindowStart = m_windowStart;
qint64 oldWindowEnd = m_windowEnd;
if (traceDuration() / shownDuration < maximumZoomFactor()) {
m_windowStart = m_traceStart;
m_windowEnd = m_traceEnd;
} else if (windowDuration() / shownDuration > maximumZoomFactor() ||
windowDuration() / shownDuration * 2 < maximumZoomFactor() ||
m_rangeStart < m_windowStart || m_rangeEnd > m_windowEnd) {
qint64 keep = shownDuration * maximumZoomFactor() / 2 - shownDuration;
m_windowStart = m_rangeStart - keep;
if (m_windowStart < m_traceStart) {
keep += m_traceStart - m_windowStart;
m_windowStart = m_traceStart;
}
m_windowEnd = m_rangeEnd + keep;
if (m_windowEnd > m_traceEnd) {
m_windowStart = qMax(m_traceStart, m_windowStart - (m_windowEnd - m_traceEnd));
m_windowEnd = m_traceEnd;
}
} else {
m_timer.start(501);
}
if (oldWindowStart != m_windowStart || oldWindowEnd != m_windowEnd) {
bool runTimer = m_timer.isActive();
if (!runTimer)
m_timer.start(std::numeric_limits<int>::max());
emit windowMovingChanged(true);
clampRangeToWindow(); // can stop the timer
emit windowChanged(m_windowStart, m_windowEnd);
if (!runTimer && m_timer.isActive()) {
m_timer.stop();
emit windowMovingChanged(false);
}
}
}
void TimelineZoomControl::moveWindow()
{
if (m_windowLocked)
return;
m_timer.stop();
qint64 offset = (m_rangeEnd - m_windowEnd + m_rangeStart - m_windowStart) / 2;
if (offset == 0 || (offset < 0 && m_windowStart == m_traceStart) ||
(offset > 0 && m_windowEnd == m_traceEnd)) {
emit windowMovingChanged(false);
return;
} else if (offset > rangeDuration()) {
offset = (offset + rangeDuration()) / 2;
} else if (offset < -rangeDuration()) {
offset = (offset - rangeDuration()) / 2;
}
m_windowStart += offset;
if (m_windowStart < m_traceStart) {
m_windowEnd += m_traceStart - m_windowStart;
m_windowStart = m_traceStart;
}
m_windowEnd += offset;
if (m_windowEnd > m_traceEnd) {
m_windowStart -= m_windowEnd - m_traceEnd;
m_windowEnd = m_traceEnd;
}
clampRangeToWindow();
emit windowChanged(m_windowStart, m_windowEnd);
m_timer.start(100);
}
void TimelineZoomControl::clampRangeToWindow()
{
qint64 rangeStart = qMin(qMax(m_rangeStart, m_windowStart), m_windowEnd);
qint64 rangeEnd = qMin(qMax(rangeStart, m_rangeEnd), m_windowEnd);
if (rangeStart != m_rangeStart || rangeEnd != m_rangeEnd)
setRange(rangeStart, rangeEnd);
}
} // namespace Timeline
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