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/*
* Copyright (C) 2016, Mike Walters <mike@flomp.net>
*
* This file is part of inspectrum.
*
* 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 <QApplication>
#include <QDebug>
#include "cursors.h"
Cursors::Cursors(QObject * parent) : QObject::QObject(parent)
{
minCursor = new Cursor(Qt::Vertical, Qt::SizeHorCursor, this);
maxCursor = new Cursor(Qt::Vertical, Qt::SizeHorCursor, this);
connect(minCursor, &Cursor::posChanged, this, &Cursors::cursorMoved);
connect(maxCursor, &Cursor::posChanged, this, &Cursors::cursorMoved);
}
void Cursors::cursorMoved()
{
// Swap cursors if one has been dragged past the other
if (minCursor->pos() > maxCursor->pos()) {
std::swap(minCursor, maxCursor);
}
emit cursorsMoved();
}
bool Cursors::pointWithinDragRegion(QPoint point) {
int margin = 10;
range_t<int> range = {minCursor->pos()+margin, maxCursor->pos()-margin};
return range.contains(point.x());
}
bool Cursors::mouseEvent(QEvent::Type type, QMouseEvent event)
{
if (minCursor->mouseEvent(type, event))
return true;
if (maxCursor->mouseEvent(type, event))
return true;
// If the mouse pointer is between the cursors, display a resize pointer
if (pointWithinDragRegion(event.pos()) && type != QEvent::Leave) {
if (!cursorOverride) {
cursorOverride = true;
QApplication::setOverrideCursor(QCursor(Qt::SizeAllCursor));
}
// Restore pointer otherwise
} else {
if (cursorOverride) {
cursorOverride = false;
QApplication::restoreOverrideCursor();
}
}
// Start dragging on left mouse button press, if between the cursors
if (type == QEvent::MouseButtonPress) {
if (event.button() == Qt::LeftButton) {
if (pointWithinDragRegion(event.pos())) {
dragging = true;
dragPos = event.pos();
return true;
}
}
// Update both cursor positons if we're dragging
} else if (type == QEvent::MouseMove) {
if (dragging) {
int dx = event.pos().x() - dragPos.x();
minCursor->setPos(minCursor->pos() + dx);
maxCursor->setPos(maxCursor->pos() + dx);
dragPos = event.pos();
emit cursorsMoved();
}
// Stop dragging on left mouse button release
} else if (type == QEvent::MouseButtonRelease) {
if (event.button() == Qt::LeftButton && dragging) {
dragging = false;
return true;
}
}
return false;
}
void Cursors::paintFront(QPainter &painter, QRect &rect, range_t<off_t> sampleRange)
{
painter.save();
QRect cursorRect(minCursor->pos(), rect.top(), maxCursor->pos() - minCursor->pos(), rect.height());
// Draw translucent white fill for highlight
painter.fillRect(
cursorRect,
QBrush(QColor(255, 255, 255, 50))
);
// Draw vertical edges for individual segments
painter.setPen(QPen(Qt::gray, 1, Qt::DashLine));
for (int i = 1; i < segmentCount; i++) {
int pos = minCursor->pos() + (i * cursorRect.width() / segmentCount);
painter.drawLine(pos, rect.top(), pos, rect.bottom());
}
// Draw vertical edges
painter.setPen(QPen(Qt::white, 1, Qt::SolidLine));
painter.drawLine(minCursor->pos(), rect.top(), minCursor->pos(), rect.bottom());
painter.drawLine(maxCursor->pos(), rect.top(), maxCursor->pos(), rect.bottom());
painter.restore();
}
int Cursors::segments()
{
return segmentCount;
}
range_t<int> Cursors::selection()
{
return {minCursor->pos(), maxCursor->pos()};
}
void Cursors::setSegments(int segments)
{
segmentCount = std::max(segments, 1);
}
void Cursors::setSelection(range_t<int> selection)
{
minCursor->setPos(selection.minimum);
maxCursor->setPos(selection.maximum);
}