From ce17c956368789d6add77c57bba5e0a8bb63942a Mon Sep 17 00:00:00 2001
From: regulus79 <117475203+regulus79@users.noreply.github.com>
Date: Sun, 4 Aug 2024 04:30:42 -0400
Subject: [PATCH] Add Continuous Auto-Scrolling (#7396)

* Initial Commit

* Refactor code and add new icons

* Fix logical error

* Add smooth scrolling to Song Editor

* Remove unused variable

* Fix scrolling speed and scrollbar width

* Remove QDebug and re-add a newline I deleted in an unrelated file

* Forgot to add files to commit

* Remove unused variable

* Fix Styling

* Fix Styling Again

* Fix Styling Again

* Fix Styling Again

* Add icons for classic theme

* Accidentally committed varying scroll speed with zoom -- removing

* Change abs to std::abs

Co-authored-by: saker <sakertooth@gmail.com>

* Change qMax to std::max and use static_cast

Co-authored-by: saker <sakertooth@gmail.com>

* Simplify stepped auto scrolling

Co-authored-by: saker <sakertooth@gmail.com>

* Remove unnecessary parentheses

* Remove return statement causing the play head line to stop

* Add specific tooltips to auto scrolling button states

* Remove `== true` from SongEditor.cpp

Co-authored-by: saker <sakertooth@gmail.com>

* Make tooltips translatable

Co-authored-by: Dominic Clark <mrdomclark@gmail.com>

* Fix zooming position calculation

* Rename bars to ticks

* Fix rubberband rect size

---------

Co-authored-by: saker <sakertooth@gmail.com>
Co-authored-by: Dominic Clark <mrdomclark@gmail.com>
---
 .../classic/autoscroll_continuous_on.png      | Bin 0 -> 9733 bytes
 data/themes/classic/autoscroll_stepped_on.png | Bin 0 -> 11905 bytes
 .../default/autoscroll_continuous_on.png      | Bin 0 -> 7966 bytes
 data/themes/default/autoscroll_stepped_on.png | Bin 0 -> 8791 bytes
 include/TimeLineWidget.h                      |   5 +-
 src/gui/editors/PianoRoll.cpp                 |  32 ++++++----
 src/gui/editors/SongEditor.cpp                |  57 +++++++++---------
 src/gui/editors/TimeLineWidget.cpp            |   7 ++-
 src/gui/tracks/TrackContentWidget.cpp         |   5 +-
 9 files changed, 59 insertions(+), 47 deletions(-)
 create mode 100644 data/themes/classic/autoscroll_continuous_on.png
 create mode 100644 data/themes/classic/autoscroll_stepped_on.png
 create mode 100644 data/themes/default/autoscroll_continuous_on.png
 create mode 100644 data/themes/default/autoscroll_stepped_on.png

diff --git a/data/themes/classic/autoscroll_continuous_on.png b/data/themes/classic/autoscroll_continuous_on.png
new file mode 100644
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H|4jd1D+9KA

literal 0
HcmV?d00001

diff --git a/include/TimeLineWidget.h b/include/TimeLineWidget.h
index 5c683cfd9..0eb33bad9 100644
--- a/include/TimeLineWidget.h
+++ b/include/TimeLineWidget.h
@@ -73,7 +73,8 @@ public:
 
 	enum class AutoScrollState
 	{
-		Enabled,
+		Stepped,
+		Continuous,
 		Disabled
 	};
 
@@ -212,7 +213,7 @@ private:
 	QCursor m_cursorSelectLeft = QCursor{embed::getIconPixmap("cursor_select_left"), 0, 16};
 	QCursor m_cursorSelectRight = QCursor{embed::getIconPixmap("cursor_select_right"), 32, 16};
 
-	AutoScrollState m_autoScroll = AutoScrollState::Enabled;
+	AutoScrollState m_autoScroll = AutoScrollState::Stepped;
 
 	// Width of the unused region on the widget's left (above track labels or piano)
 	int m_xOffset;
diff --git a/src/gui/editors/PianoRoll.cpp b/src/gui/editors/PianoRoll.cpp
index bda6894f3..1c89f6a0b 100644
--- a/src/gui/editors/PianoRoll.cpp
+++ b/src/gui/editors/PianoRoll.cpp
@@ -4062,7 +4062,7 @@ void PianoRoll::stop()
 {
 	Engine::getSong()->stop();
 	m_recording = false;
-	m_scrollBack = ( m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Enabled );
+	m_scrollBack = m_timeLine->autoScroll() != TimeLineWidget::AutoScrollState::Disabled;
 }
 
 
@@ -4463,30 +4463,36 @@ bool PianoRoll::deleteSelectedNotes()
 void PianoRoll::autoScroll( const TimePos & t )
 {
 	const int w = width() - m_whiteKeyWidth;
-	if( t > m_currentPosition + w * TimePos::ticksPerBar() / m_ppb )
+	if (m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Stepped) 
 	{
-		m_leftRightScroll->setValue( t.getBar() * TimePos::ticksPerBar() );
+		if (t > m_currentPosition + w * TimePos::ticksPerBar() / m_ppb)
+		{
+			m_leftRightScroll->setValue(t.getBar() * TimePos::ticksPerBar());
+		}
+		else if (t < m_currentPosition)
+		{
+			TimePos t2 = std::max(t - w * TimePos::ticksPerBar() *
+						TimePos::ticksPerBar() / m_ppb, static_cast<tick_t>(0));
+			m_leftRightScroll->setValue(t2.getBar() * TimePos::ticksPerBar());
+		}
 	}
-	else if( t < m_currentPosition )
+	else if (m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Continuous)
 	{
-		TimePos t2 = qMax( t - w * TimePos::ticksPerBar() *
-					TimePos::ticksPerBar() / m_ppb, (tick_t) 0 );
-		m_leftRightScroll->setValue( t2.getBar() * TimePos::ticksPerBar() );
+		m_leftRightScroll->setValue(std::max(t.getTicks() - w * TimePos::ticksPerBar() / m_ppb / 2, 0));
 	}
 	m_scrollBack = false;
 }
 
 
 
-
-void PianoRoll::updatePosition( const TimePos & t )
+void PianoRoll::updatePosition(const TimePos & t)
 {
-	if( ( Engine::getSong()->isPlaying()
+	if ((Engine::getSong()->isPlaying()
 			&& Engine::getSong()->playMode() == Song::PlayMode::MidiClip
-			&& m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Enabled
-		) || m_scrollBack )
+			&& m_timeLine->autoScroll() != TimeLineWidget::AutoScrollState::Disabled
+		) || m_scrollBack)
 	{
-		autoScroll( t );
+		autoScroll(t);
 	}
 	// ticks relative to m_currentPosition
 	// < 0 = outside viewport left
diff --git a/src/gui/editors/SongEditor.cpp b/src/gui/editors/SongEditor.cpp
index 9ba9ac083..f043e715a 100644
--- a/src/gui/editors/SongEditor.cpp
+++ b/src/gui/editors/SongEditor.cpp
@@ -231,10 +231,10 @@ SongEditor::SongEditor( Song * song ) :
 	static_cast<QVBoxLayout *>( layout() )->insertWidget( 0, m_timeLine );
 
 	m_leftRightScroll = new QScrollBar( Qt::Horizontal, this );
-	m_leftRightScroll->setMinimum( 0 );
-	m_leftRightScroll->setMaximum( 0 );
-	m_leftRightScroll->setSingleStep( 1 );
-	m_leftRightScroll->setPageStep( 20 );
+	m_leftRightScroll->setMinimum(0);
+	m_leftRightScroll->setMaximum(0);
+	m_leftRightScroll->setSingleStep(1);
+	m_leftRightScroll->setPageStep(20 * TimePos::ticksPerBar());
 	static_cast<QVBoxLayout *>( layout() )->addWidget( m_leftRightScroll );
 	connect( m_leftRightScroll, SIGNAL(valueChanged(int)),
 					this, SLOT(scrolled(int)));
@@ -325,7 +325,7 @@ QString SongEditor::getSnapSizeString() const
 void SongEditor::scrolled( int new_pos )
 {
 	update();
-	emit positionChanged( m_currentPosition = TimePos( new_pos, 0 ) );
+	emit positionChanged(m_currentPosition = TimePos(new_pos));
 }
 
 
@@ -384,7 +384,7 @@ void SongEditor::updateRubberband()
 		}
 
 		//take care of the scrollbar position
-		int hs = (m_leftRightScroll->value() - m_scrollPos.x()) * pixelsPerBar();
+		int hs = (m_leftRightScroll->value() - m_scrollPos.x()) * pixelsPerBar() / TimePos::ticksPerBar();
 		int vs = contentWidget()->verticalScrollBar()->value() - m_scrollPos.y();
 
 		//the adjusted origin point
@@ -522,8 +522,8 @@ void SongEditor::wheelEvent( QWheelEvent * we )
 	if ((we->modifiers() & Qt::ControlModifier) && (position(we).x() > m_trackHeadWidth))
 	{
 		int x = position(we).x() - m_trackHeadWidth;
-		// bar based on the mouse x-position where the scroll wheel was used
-		int bar = x / pixelsPerBar();
+		// tick based on the mouse x-position where the scroll wheel was used
+		int tick = x / pixelsPerBar() * TimePos::ticksPerBar();
 
 		// move zoom slider (pixelsPerBar will change automatically)
 		int step = we->modifiers() & Qt::ShiftModifier ? 1 : 5;
@@ -531,9 +531,9 @@ void SongEditor::wheelEvent( QWheelEvent * we )
 		int direction = (we->angleDelta().y() + we->angleDelta().x()) > 0 ? 1 : -1;
 		m_zoomingModel->incValue(step * direction);
 
-		// scroll to zooming around cursor's bar
-		int newBar = static_cast<int>(x / pixelsPerBar());
-		m_leftRightScroll->setValue(m_leftRightScroll->value() + bar - newBar);
+		// scroll to zooming around cursor's tick
+		int newTick = static_cast<int>(x / pixelsPerBar() * TimePos::ticksPerBar());
+		m_leftRightScroll->setValue(m_leftRightScroll->value() + tick - newTick);
 
 		// update timeline
 		m_timeLine->setPixelsPerBar(pixelsPerBar());
@@ -542,15 +542,15 @@ void SongEditor::wheelEvent( QWheelEvent * we )
 	}
 
 	// FIXME: Reconsider if determining orientation is necessary in Qt6.
-	else if(abs(we->angleDelta().x()) > abs(we->angleDelta().y())) // scrolling is horizontal
+	else if (std::abs(we->angleDelta().x()) > std::abs(we->angleDelta().y())) // scrolling is horizontal
 	{
-		m_leftRightScroll->setValue(m_leftRightScroll->value() -
-							we->angleDelta().x() /30);
+		m_leftRightScroll->setValue(m_leftRightScroll->value()
+							- we->angleDelta().x());
 	}
-	else if(we->modifiers() & Qt::ShiftModifier)
+	else if (we->modifiers() & Qt::ShiftModifier)
 	{
-		m_leftRightScroll->setValue(m_leftRightScroll->value() -
-							we->angleDelta().y() / 30);
+		m_leftRightScroll->setValue(m_leftRightScroll->value()
+							- we->angleDelta().y());
 	}
 	else
 	{
@@ -711,9 +711,9 @@ void SongEditor::hideMasterPitchFloat( void )
 
 
 
-void SongEditor::updateScrollBar( int len )
+void SongEditor::updateScrollBar(int len)
 {
-	m_leftRightScroll->setMaximum( len );
+	m_leftRightScroll->setMaximum(len * TimePos::ticksPerBar());
 }
 
 
@@ -756,22 +756,25 @@ void SongEditor::updatePosition( const TimePos & t )
 	const auto widgetWidth = compactTrackButtons ? DEFAULT_SETTINGS_WIDGET_WIDTH_COMPACT : DEFAULT_SETTINGS_WIDGET_WIDTH;
 	const auto trackOpWidth = compactTrackButtons ? TRACK_OP_WIDTH_COMPACT : TRACK_OP_WIDTH;
 
-	if( ( m_song->isPlaying() && m_song->m_playMode == Song::PlayMode::Song
-		  && m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Enabled) ||
-							m_scrollBack == true )
+	if ((m_song->isPlaying() && m_song->m_playMode == Song::PlayMode::Song)
+							|| m_scrollBack)
 	{
 		m_smoothScroll = ConfigManager::inst()->value( "ui", "smoothscroll" ).toInt();
 		const int w = width() - widgetWidth
 							- trackOpWidth
 							- contentWidget()->verticalScrollBar()->width(); // width of right scrollbar
-		if( t > m_currentPosition + w * TimePos::ticksPerBar() /
-							pixelsPerBar() )
+		
+		if (m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Stepped)
 		{
-			animateScroll( m_leftRightScroll, t.getBar(), m_smoothScroll );
+			const auto nextPosition = m_currentPosition + w * TimePos::ticksPerBar() / pixelsPerBar();
+			if (t > nextPosition || t < m_currentPosition) 
+			{
+				animateScroll(m_leftRightScroll, t.getTicks(), m_smoothScroll);
+			}
 		}
-		else if( t < m_currentPosition )
+		else if (m_timeLine->autoScroll() == TimeLineWidget::AutoScrollState::Continuous)
 		{
-			animateScroll( m_leftRightScroll, t.getBar(), m_smoothScroll );
+			animateScroll(m_leftRightScroll, std::max(t.getTicks() - w * TimePos::ticksPerBar() / pixelsPerBar() / 2, 0.0f), m_smoothScroll);
 		}
 		m_scrollBack = false;
 	}
diff --git a/src/gui/editors/TimeLineWidget.cpp b/src/gui/editors/TimeLineWidget.cpp
index 7657e2916..f75b1cabf 100644
--- a/src/gui/editors/TimeLineWidget.cpp
+++ b/src/gui/editors/TimeLineWidget.cpp
@@ -88,9 +88,10 @@ void TimeLineWidget::setXOffset(const int x)
 void TimeLineWidget::addToolButtons( QToolBar * _tool_bar )
 {
 	auto autoScroll = new NStateButton(_tool_bar);
-	autoScroll->setGeneralToolTip( tr( "Auto scrolling" ) );
-	autoScroll->addState( embed::getIconPixmap( "autoscroll_on" ) );
-	autoScroll->addState( embed::getIconPixmap( "autoscroll_off" ) );
+	autoScroll->setGeneralToolTip(tr("Auto scrolling"));
+	autoScroll->addState(embed::getIconPixmap("autoscroll_stepped_on"), tr("Stepped auto scrolling"));
+	autoScroll->addState(embed::getIconPixmap("autoscroll_continuous_on"), tr("Continuous auto scrolling"));
+	autoScroll->addState(embed::getIconPixmap("autoscroll_off"), tr("Auto scrolling disabled"));
 	connect( autoScroll, SIGNAL(changedState(int)), this,
 					SLOT(toggleAutoScroll(int)));
 
diff --git a/src/gui/tracks/TrackContentWidget.cpp b/src/gui/tracks/TrackContentWidget.cpp
index afea82ea4..1926ffeef 100644
--- a/src/gui/tracks/TrackContentWidget.cpp
+++ b/src/gui/tracks/TrackContentWidget.cpp
@@ -292,6 +292,7 @@ void TrackContentWidget::changePosition( const TimePos & newPos )
 	setUpdatesEnabled( true );
 
 	// redraw background
+	updateBackground();
 //	update();
 }
 
@@ -628,8 +629,8 @@ void TrackContentWidget::paintEvent( QPaintEvent * pe )
 	// Don't draw background on Pattern Editor
 	if (m_trackView->trackContainerView() != getGUI()->patternEditor()->m_editor)
 	{
-		p.drawTiledPixmap( rect(), m_background, QPoint(
-				tcv->currentPosition().getBar() * ppb, 0 ) );
+		p.drawTiledPixmap(rect(), m_background, QPoint(
+				tcv->currentPosition().getTicks() * ppb / TimePos::ticksPerBar(), 0));
 	}
 }