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/*
SPDX-FileCopyrightText: 2017 Martin Flöser <mgraesslin@kde.org>
SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include <QApplication>
#include <QCursor>
#include <QMouseEvent>
#include <QPainter>
#include <QWidget>
class MouseCursorWidget : public QWidget
{
Q_OBJECT
public:
explicit MouseCursorWidget();
~MouseCursorWidget() override;
protected:
void paintEvent(QPaintEvent *event) override;
void mouseMoveEvent(QMouseEvent *event) override;
void keyPressEvent(QKeyEvent *event) override;
private:
QPoint m_cursorPos;
QCursor m_cursors[5];
int m_cursorIndex = 0;
};
namespace
{
QCursor createCenterHotspotCursor()
{
QPixmap cursor(64, 64);
cursor.fill(Qt::transparent);
QPainter p(&cursor);
p.setPen(Qt::black);
const QPoint center = cursor.rect().center();
p.drawLine(0, center.y(), center.x() - 1, center.y());
p.drawLine(center.x() + 1, center.y(), cursor.width(), center.y());
p.drawLine(center.x(), 0, center.x(), center.y() - 1);
p.drawLine(center.x(), center.y() + 1, center.x(), cursor.height());
return QCursor(cursor, 31, 31);
}
QCursor createTopLeftHotspotCursor()
{
QPixmap cursor(64, 64);
cursor.fill(Qt::transparent);
QPainter p(&cursor);
p.setPen(Qt::black);
p.drawLine(0, 1, 0, cursor.height());
p.drawLine(1, 0, cursor.width(), 0);
return QCursor(cursor, 0, 0);
}
QCursor createTopRightHotspotCursor()
{
QPixmap cursor(64, 64);
cursor.fill(Qt::transparent);
QPainter p(&cursor);
p.setPen(Qt::black);
p.drawLine(cursor.width() - 1, 1, cursor.width() - 1, cursor.height());
p.drawLine(0, 0, cursor.width() - 2, 0);
return QCursor(cursor, 63, 0);
}
QCursor createButtomRightHotspotCursor()
{
QPixmap cursor(64, 64);
cursor.fill(Qt::transparent);
QPainter p(&cursor);
p.setPen(Qt::black);
p.drawLine(cursor.width() - 1, 0, cursor.width() - 1, cursor.height() - 2);
p.drawLine(0, cursor.height() - 1, cursor.width() - 2, cursor.height() - 1);
return QCursor(cursor, 63, 63);
}
QCursor createButtomLeftHotspotCursor()
{
QPixmap cursor(64, 64);
cursor.fill(Qt::transparent);
QPainter p(&cursor);
p.setPen(Qt::black);
p.drawLine(0, 0, 0, cursor.height() - 2);
p.drawLine(1, cursor.height() - 1, cursor.width(), cursor.height() - 1);
return QCursor(cursor, 0, 63);
}
}
MouseCursorWidget::MouseCursorWidget()
: QWidget()
{
setMouseTracking(true);
// create cursors
m_cursors[0] = createCenterHotspotCursor();
m_cursors[1] = createTopLeftHotspotCursor();
m_cursors[2] = createTopRightHotspotCursor();
m_cursors[3] = createButtomRightHotspotCursor();
m_cursors[4] = createButtomLeftHotspotCursor();
setCursor(m_cursors[m_cursorIndex]);
}
MouseCursorWidget::~MouseCursorWidget() = default;
void MouseCursorWidget::paintEvent(QPaintEvent *event)
{
QPainter p(this);
p.fillRect(0, 0, width(), height(), Qt::white);
if (geometry().contains(m_cursorPos)) {
p.setPen(Qt::red);
p.drawPoint(m_cursorPos);
}
}
void MouseCursorWidget::mouseMoveEvent(QMouseEvent *event)
{
m_cursorPos = event->pos();
update();
}
void MouseCursorWidget::keyPressEvent(QKeyEvent *event)
{
if (event->key() == Qt::Key_Space) {
m_cursorIndex = (m_cursorIndex + 1) % 5;
setCursor(m_cursors[m_cursorIndex]);
}
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MouseCursorWidget widget;
widget.show();
return app.exec();
}
#include "cursorhotspottest.moc"
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