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