qt5base-lts/tests/manual/qcursor/grab_override/mainwindow.cpp

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#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QTimer>
#include <QBitmap>
#include <QImage>
#include <QPainter>
#include <QKeyEvent>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QPixmap pix(":/data/monkey_on_64x64.png");

    QImage mask(16, 16, QImage::Format_MonoLSB);
    QImage bw(16, 16, QImage::Format_MonoLSB);
    mask.fill(0);
    bw.fill(0);
    for (int x = 0; x < 16; x++) {
        bw.setPixel(x, x, 1);
        bw.setPixel(x, 15 - x, 1);
        mask.setPixel(x, x, 1);
        mask.setPixel(x, 15 - x, 1);
        if (x > 0 && x < 15) {
            mask.setPixel(x - 1, x, 1);
            mask.setPixel(x + 1, x, 1);
            mask.setPixel(x - 1, 15 - x, 1);
            mask.setPixel(x + 1, 15 - x, 1);
        }
    }

    ccurs = QCursor(pix);
    bcurs = QCursor(QBitmap::fromImage(bw), QBitmap::fromImage(mask));
    ui->label->setCursor(ccurs);

    timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(toggleOverrideCursor()));
    timer->start(2000);

    override = 0;
}

MainWindow::~MainWindow()
{
    delete timer;
    delete ui;
}

void MainWindow::toggleOverrideCursor()
{
    switch (override) {
    case 0:
        QApplication::setOverrideCursor(Qt::BusyCursor);
        break;
    case 1:
        QApplication::restoreOverrideCursor();
        break;
    case 2:
        ui->label->grabMouse(Qt::ForbiddenCursor);
        break;
    case 3:
    case 5:
        ui->label->releaseMouse();
        break;
    case 4:
        ui->label->grabMouse();
        break;
    case 6:
        ui->label->setCursor(bcurs);
        break;
    case 7:
        ui->label->setCursor(ccurs);
        break;
    }
    override = (override + 1) % 8;
}

void MainWindow::keyPressEvent(QKeyEvent* event)
{
    QPoint off(0, 0);
    switch (event->key()) {
    case Qt::Key_Up:
        off.setY(-4);
        break;
    case Qt::Key_Down:
        off.setY(4);
        break;
    case Qt::Key_Left:
        off.setX(-4);
        break;
    case Qt::Key_Right:
        off.setX(4);
        break;
    default:
        return QMainWindow::keyPressEvent(event);
    }
    off += QCursor::pos();
    QCursor::setPos(off);
}