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ec7c42a Aug 12, 2016
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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 "cursor.h"
Cursor::Cursor(Qt::Orientation orientation, Qt::CursorShape mouseCursorShape, QObject * parent) : QObject::QObject(parent), orientation(orientation), cursorShape(mouseCursorShape)
{
}
int Cursor::fromPoint(QPoint point)
{
return (orientation == Qt::Vertical) ? point.x() : point.y();
}
bool Cursor::pointOverCursor(QPoint point)
{
const int margin = 5;
range_t<int> range = {cursorPosition - margin, cursorPosition + margin};
return range.contains(fromPoint(point));
}
bool Cursor::mouseEvent(QEvent::Type type, QMouseEvent event)
{
// If the mouse pointer moves over a cursor, display a resize pointer
if (pointOverCursor(event.pos()) && type != QEvent::Leave) {
if (!cursorOverrided) {
cursorOverrided = true;
QApplication::setOverrideCursor(QCursor(cursorShape));
}
// Restore pointer if it moves off the cursor, or leaves the widget
} else if (cursorOverrided) {
cursorOverrided = false;
QApplication::restoreOverrideCursor();
}
// Start dragging on left mouse button press, if over a cursor
if (type == QEvent::MouseButtonPress) {
if (event.button() == Qt::LeftButton) {
if (pointOverCursor(event.pos())) {
dragging = true;
return true;
}
}
// Update current cursor positon if we're dragging
} else if (type == QEvent::MouseMove) {
if (dragging) {
cursorPosition = fromPoint(event.pos());
emit posChanged();
}
// Stop dragging on left mouse button release
} else if (type == QEvent::MouseButtonRelease) {
if (event.button() == Qt::LeftButton && dragging) {
dragging = false;
return true;
}
}
return false;
}
int Cursor::pos()
{
return cursorPosition;
}
void Cursor::setPos(int newPos)
{
cursorPosition = newPos;
}