ProjectorDragCorner.cpp

/*
 *  LiveFit
 *  Copyright (C) 2016 The University of Georgia
 *
 *  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; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "ProjectorDragCorner.hpp"

#include <QMouseEvent>
#include <QPainter>
#include <QApplication>

ProjectorDragCorner::ProjectorDragCorner(QWidget *parent) : QWidget(parent)
{
    selected = false;
    dragging = false;
    radius = 10;

    resize(QSize(radius*2, radius*2));
}

void ProjectorDragCorner::paintEvent(QPaintEvent *event) {
    QPainter painter;
    QPen drawPen;

    if (dragging) {
        drawPen = QPen(QColor(255, 0, 0));
    } else {
        drawPen = QPen(QColor(0, 255, 0));
    }

    painter.begin(this);

    painter.setPen(drawPen);
    painter.drawEllipse(rect().adjusted(1,1,-1,-1));
    painter.drawPie(rect().adjusted(1,1,-1,-1),
                    -90*16+90*16*(property("cornerIndex").toInt()),
                    90*16);

    painter.end();
}

void ProjectorDragCorner::mousePressEvent(QMouseEvent *event) {
    if (event->button() == Qt::LeftButton) {
        if (!selected) {
            dragStartPos = event->pos();
            selected = true;
        } else {
            selected = false;
        }
        update();
    } else {
        QWidget::mousePressEvent(event);
        return;
    }
}

void ProjectorDragCorner::mouseMoveEvent(QMouseEvent *event) {
    if (!selected ||
            !(event->buttons() & Qt::LeftButton)) {
        QWidget::mouseMoveEvent(event);
        return;
    } else if (dragging || (event->pos() - dragStartPos).manhattanLength() >=
               QApplication::startDragDistance()) {
        dragging = true;
        move(mapToParent(event->pos()) - QPoint(radius, radius));
    }
}

void ProjectorDragCorner::mouseReleaseEvent(QMouseEvent *event) {
    if (dragging && event->button() == Qt::LeftButton) {
        dragging = false;
        selected = false;

        // Alert any listeners that we have 'dropped'
        emit moveCompleted(pos() - QPoint(radius, radius));
        update();
    }
}