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module chasewidget;


import qt.core.QSize;
import qt.core.QPoint;

import qt.gui.QColor;
import qt.gui.QPixmap;
import qt.gui.QWidget;
import qt.gui.QApplication;
import qt.gui.QHideEvent;
import qt.gui.QPainter;
import qt.gui.QPaintEvent;
import qt.gui.QShowEvent;


class ChaseWidget : public QWidget
{
public:

	this(QWidget parent = null, QPixmap pixmap = new QPixmap(), bool pixmapEnabled = false)
	{
		super(parent);
		m_segment = 0;
		m_delay = 100;
		m_step = 40;
		m_timerId = -1;
		m_animated = false;
		m_pixmap = pixmap;
		m_pixmapEnabled = pixmapEnabled;
	}

	void setAnimated(bool value)
	{
		if (m_animated == value)
			return;
		m_animated = value;
		if (m_timerId != -1) {
			killTimer(m_timerId);
			m_timerId = -1;
		}
		if (m_animated) {
			m_segment = 0;
			m_timerId = startTimer(m_delay);
		}
		update();
	}

	void setPixmapEnabled(bool enable)
	{
		m_pixmapEnabled = enable;
	}
	
	QSize sizeHint()
	{
		return QSize(32, 32);
	}

protected:

	void paintEvent(QPaintEvent event)
	{
		auto p = new QPainter(this);
		if (m_pixmapEnabled && !m_pixmap.isNull()) {
			p.drawPixmap(0, 0, m_pixmap);
			return;
		}

		int extent = qMin(width() - 8, height() - 8);
		int displ = extent / 4;
		int ext = extent / 4 - 1;

		p.setRenderHint(QPainter.Antialiasing, true);

		if(m_animated)
			p.setPen(Qt.gray);
		else
			p.setPen(QPen(palette().dark().color()));

		p.translate(width() / 2, height() / 2); // center

		for (int segment = 0; segment < segmentCount(); ++segment) {
			p.rotate(QApplication.isRightToLeft() ? m_step : -m_step);
			if(m_animated)
				p.setBrush(colorForSegment(segment));
			else
				p.setBrush(palette().background());
			p.drawEllipse(QRect(displ, -ext / 2, ext, ext));
		}
	}

	void timerEvent(QTimerEvent event)
	{
		if (event.timerId() == m_timerId) {
			++m_segment;
			update();
		}
		QWidget.timerEvent(event);
	}

private:

	int segmentCount()
	{
		return 360 / m_step;
	}

	QColor colorForSegment(int seg)
	{
		int index = ((seg + m_segment) % segmentCount());
		int comp = qMax(0, 255 - (index * (255 / segmentCount())));
		return QColor(comp, comp, comp, 255);
	}

	int m_segment;
	int m_delay;
	int m_step;
	int m_timerId;
	bool m_animated;
	QPixmap m_pixmap;
	bool m_pixmapEnabled;
}