/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 Olive Team
  Modifications Copyright (C) 2025 mikesolar

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "timelineandtrackview.h"

#include <QHBoxLayout>
#include <QScrollBar>

namespace olive
{

TimelineAndTrackView::TimelineAndTrackView(Qt::Alignment vertical_alignment,
										   QWidget *parent)
	: QWidget(parent)
{
	QHBoxLayout *layout = new QHBoxLayout(this);
	layout->setSpacing(0);
	layout->setContentsMargins(0, 0, 0, 0);

	splitter_ = new QSplitter(Qt::Horizontal);
	splitter_->setChildrenCollapsible(false);
	layout->addWidget(splitter_);

	track_view_ = new TrackView(vertical_alignment);
	splitter_->addWidget(track_view_);

	view_ = new TimelineView(vertical_alignment);
	splitter_->addWidget(view_);

	connect(view_->verticalScrollBar(), &QScrollBar::valueChanged, this,
			&TimelineAndTrackView::view_value_changed);
	connect(track_view_->verticalScrollBar(), &QScrollBar::valueChanged, this,
			&TimelineAndTrackView::tracks_value_changed);

	// Default track header width: 180px (per UI design reference)
	splitter_->setSizes({ 180, width() });
}

TimelineAndTrackView::~TimelineAndTrackView()
{
	// When the child views are destroyed they reset their scene, which can
	// push a valueChanged through these connections while this object is
	// already half-destroyed (Qt aborts on a slot invoked past its class's
	// destructor). Detach first so teardown emissions go nowhere.
	disconnect(view_->verticalScrollBar(), nullptr, this, nullptr);
	disconnect(track_view_->verticalScrollBar(), nullptr, this, nullptr);
}

QSplitter *TimelineAndTrackView::splitter() const
{
	return splitter_;
}

TimelineView *TimelineAndTrackView::view() const
{
	return view_;
}

TrackView *TimelineAndTrackView::track_view() const
{
	return track_view_;
}

void TimelineAndTrackView::view_value_changed(int v)
{
	track_view_->verticalScrollBar()->setValue(
		v - view_->verticalScrollBar()->minimum());
}

void TimelineAndTrackView::tracks_value_changed(int v)
{
	view_->verticalScrollBar()->setValue(view_->verticalScrollBar()->minimum() +
										 v);
}

}