LMMS/include/StepRecorderWidget.h

/*
 * StepRecorderWidget.h - widget that provide gui markers for step recording
 *
 * This file is part of LMMS - https://lmms.io
 *
 * 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 2 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
#ifndef STEP_RECOREDER_WIDGET_H
#define STEP_RECOREDER_WIDGET_H

#include "lmms_basics.h"
#include "Note.h"

#include <QWidget>
#include <QColor>
#include <QPainter>

class StepRecorderWidget : public QWidget
{
	Q_OBJECT

public:
	StepRecorderWidget(
		QWidget * parent,
		const int ppb,
		const int marginTop,
		const int marginBottom,
		const int marginLeft,
		const int marginRight);

	//API used by PianoRoll
	void setPixelsPerBar(int ppb);
	void setCurrentPosition(MidiTime currentPosition);
	void setBottomMargin(const int marginBottom);

	//API used by StepRecorder
	void setStepsLength(MidiTime stepsLength);
	void setStartPosition(MidiTime pos);
	void setEndPosition(MidiTime pos);

	void showHint();

private:
	void paintEvent(QPaintEvent * pe) override;

	int xCoordOfTick(int tick);

	void drawVerLine(QPainter* painter, int x, const QColor& color, int top, int bottom);
	void drawVerLine(QPainter* painter, const MidiTime& pos, const QColor& color, int top, int bottom);

	void updateBoundaries();

	MidiTime m_stepsLength;
	MidiTime m_curStepStartPos;
	MidiTime m_curStepEndPos;

	int m_ppb; // pixels per bar
	MidiTime m_currentPosition; // current position showed by on PianoRoll

	QColor m_colorLineStart;
	QColor m_colorLineEnd;

	// boundaries within piano roll window
	int m_top;
	int m_bottom;
	int m_left;
	int m_right;

	const int m_marginTop;
	int m_marginBottom; // not const since can change on resize of edit-note area
	const int m_marginLeft;
	const int m_marginRight;

signals:
	void positionChanged(const MidiTime & t);
} ;

#endif //STEP_RECOREDER_WIDGET_H