/*
 Copyright © 2017 Hasan Yavuz Özderya

 This file is part of serialplot.

 serialplot 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.

 serialplot 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 serialplot. If not, see <http://www.gnu.org/licenses/>.
*/

#include "zoomer.h"
#include <qwt_plot.h>
#include <QtDebug>

#include <QMouseEvent>

Zoomer::Zoomer(QWidget* widget, bool doReplot) :
 ScrollZoomer(widget)
{
 is_panning = false;

 setTrackerMode(AlwaysOn);

 // set corner widget between the scrollbars with default background color
 auto cornerWidget = new QWidget();
 auto bgColor = cornerWidget->palette().color(QPalette::Window).name();
 auto styleSheet = QString("background-color:%1;").arg(bgColor);
 cornerWidget->setStyleSheet(styleSheet);
 ScrollZoomer::setCornerWidget(cornerWidget);
}

void Zoomer::zoom(int up)
{
 ScrollZoomer::zoom(up);

 if(zoomRectIndex() == 0)
 {
 emit unzoomed();
 }
}

void Zoomer::zoom( const QRectF & rect)
{
 // set the zoom base when user zooms in to first level
 if (zoomRectIndex() == 0)
 {
 this->setZoomBase(false);
 }

 ScrollZoomer::zoom(rect);
}

QwtText Zoomer::trackerTextF(const QPointF& pos) const
{
 QwtText b = ScrollZoomer::trackerTextF(pos);

 const QPolygon pa = selection();
 if (!isActive() || pa.count() < 2)
 {
 return b;
 }

 const QRectF rect = invTransform(QRect(pa.first(), pa.last()).normalized());

 QString sizeText = QString(" [%1, %2]").\
 arg(rect.width(), 0, 'g', 4).\
 arg(rect.height(), 0, 'g', 4);

 b.setText(b.text() + sizeText);

 return b;
}

void Zoomer::drawRubberBand(QPainter* painter) const
{
 const double FILL_ALPHA = 0.2;

 QColor color = painter->pen().color();
 color.setAlphaF(FILL_ALPHA);
 painter->setBrush(color);

 ScrollZoomer::drawRubberBand(painter);
}

QRegion Zoomer::rubberBandMask() const
{
 const QPolygon pa = selection();
 if (pa.count() < 2)
 {
 return QRegion();
 }
 const QRect r = QRect(pa.first(), pa.last()).normalized().adjusted(0, 0, 1, 1);
 return QRegion(r);
}

void Zoomer::widgetMousePressEvent(QMouseEvent* mouseEvent)
{
 if (mouseEvent->modifiers() & Qt::ControlModifier)
 {
 is_panning = true;
 parentWidget()->setCursor(Qt::ClosedHandCursor);
 pan_point = invTransform(mouseEvent->pos());
 }
 else
 {
 ScrollZoomer::widgetMousePressEvent(mouseEvent);
 }
}

void Zoomer::widgetMouseMoveEvent(QMouseEvent* mouseEvent)
{
 if (is_panning)
 {
 auto cur_point = invTransform(mouseEvent->pos());
 auto delta = cur_point - pan_point;
 moveBy(-delta.x(), -delta.y());
 pan_point = invTransform(mouseEvent->pos());
 }
 else
 {
 ScrollZoomer::widgetMouseMoveEvent(mouseEvent);
 }
}

void Zoomer::widgetMouseReleaseEvent(QMouseEvent* mouseEvent)
{
 if (is_panning)
 {
 is_panning = false;
 parentWidget()->setCursor(Qt::CrossCursor);
 }
 else
 {
 ScrollZoomer::widgetMouseReleaseEvent(mouseEvent);
 }
}