1 files changed, 190 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp b/tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp
new file mode 100644
index 0000000000..fb5e62906b
--- /dev/null
+++ b/tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp
@@ -0,0 +1,190 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+#if defined(QT_PRINTSUPPORT_LIB)
+#include <QtPrintSupport/qtprintsupportglobal.h>
+#if QT_CONFIG(printdialog)
+#include <QPrinter>
+#include <QPrintDialog>
+#endif
+#endif
+
+#include "scribblearea.h"
+
+static const qreal MinimumDiameter = 3.0;
+static const qreal MaximumDiameter = 50.0;
+
+//! [0]
+ScribbleArea::ScribbleArea(QWidget *parent)
+    : QWidget(parent)
+{
+    setAttribute(Qt::WA_AcceptTouchEvents);
+    setAttribute(Qt::WA_StaticContents);
+    modified = false;
+
+    myPenColors
+            << QColor("green")
+            << QColor("purple")
+            << QColor("red")
+            << QColor("blue")
+            << QColor("yellow")
+
+            << QColor("pink")
+            << QColor("orange")
+            << QColor("brown")
+            << QColor("grey")
+            << QColor("black");
+}
+//! [0]
+
+//! [1]
+bool ScribbleArea::openImage(const QString &fileName)
+//! [1] //! [2]
+{
+    QImage loadedImage;
+    if (!loadedImage.load(fileName))
+        return false;
+
+    QSize newSize = loadedImage.size().expandedTo(size());
+    resizeImage(&loadedImage, newSize);
+    image = loadedImage;
+    modified = false;
+    update();
+    return true;
+}
+//! [2]
+
+//! [3]
+bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat)
+//! [3] //! [4]
+{
+    QImage visibleImage = image;
+    resizeImage(&visibleImage, size());
+
+    if (visibleImage.save(fileName, fileFormat)) {
+        modified = false;
+        return true;
+    } else {
+        return false;
+    }
+}
+//! [4]
+
+//! [9]
+void ScribbleArea::clearImage()
+//! [9] //! [10]
+{
+    image.fill(qRgb(255, 255, 255));
+    modified = true;
+    update();
+}
+//! [10]
+
+//! [12] //! [13]
+void ScribbleArea::paintEvent(QPaintEvent *event)
+//! [13] //! [14]
+{
+    QPainter painter(this);
+    const QRect rect = event->rect();
+    painter.drawImage(rect.topLeft(), image, rect);
+}
+//! [14]
+
+//! [15]
+void ScribbleArea::resizeEvent(QResizeEvent *event)
+//! [15] //! [16]
+{
+    if (width() > image.width() || height() > image.height()) {
+        int newWidth = qMax(width() + 128, image.width());
+        int newHeight = qMax(height() + 128, image.height());
+        resizeImage(&image, QSize(newWidth, newHeight));
+        update();
+    }
+    QWidget::resizeEvent(event);
+}
+//! [16]
+
+//! [19]
+void ScribbleArea::resizeImage(QImage *image, const QSize &newSize)
+//! [19] //! [20]
+{
+    if (image->size() == newSize)
+        return;
+
+    QImage newImage(newSize, QImage::Format_RGB32);
+    newImage.fill(qRgb(255, 255, 255));
+    QPainter painter(&newImage);
+    painter.drawImage(QPoint(0, 0), *image);
+    *image = newImage;
+}
+//! [20]
+
+//! [21]
+void ScribbleArea::print()
+{
+#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
+    QPrinter printer(QPrinter::HighResolution);
+
+    QPrintDialog printDialog(&printer, this);
+//! [21] //! [22]
+    if (printDialog.exec() == QDialog::Accepted) {
+        QPainter painter(&printer);
+        QRect rect = painter.viewport();
+        QSize size = image.size();
+        size.scale(rect.size(), Qt::KeepAspectRatio);
+        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
+        painter.setWindow(image.rect());
+        painter.drawImage(0, 0, image);
+    }
+#endif // QT_CONFIG(printdialog)
+}
+//! [22]
+
+bool ScribbleArea::event(QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+    case QEvent::TouchUpdate:
+    case QEvent::TouchEnd:
+    {
+        const QTouchEvent *touch = static_cast<QTouchEvent *>(event);
+        const auto touchPoints = static_cast<QTouchEvent *>(event)->points();
+        for (const QTouchEvent::TouchPoint &touchPoint : touchPoints) {
+            switch (touchPoint.state()) {
+            case QEventPoint::Stationary:
+            case QEventPoint::Released:
+                // don't do anything if this touch point hasn't moved or has been released
+                continue;
+            default:
+                {
+                    QSizeF diams = touchPoint.ellipseDiameters();
+                    if (diams.isEmpty()) {
+                        qreal diameter = MaximumDiameter;
+                        if (touch->pointingDevice()->capabilities().testFlag(QPointingDevice::Capability::Pressure))
+                            diameter = MinimumDiameter + (MaximumDiameter - MinimumDiameter) * touchPoint.pressure();
+                        diams = QSizeF(diameter, diameter);
+                    }
+
+                    QPainter painter(&image);
+                    painter.setPen(Qt::NoPen);
+                    painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count()));
+                    painter.drawEllipse(touchPoint.position(), diams.width() / 2, diams.height() / 2);
+                    painter.end();
+
+                    modified = true;
+                    const int rad = 2;
+                    QRectF rect(QPointF(), diams);
+                    rect.moveCenter(touchPoint.position());
+                    update(rect.toRect().adjusted(-rad,-rad, +rad, +rad));
+                }
+                break;
+            }
+        }
+        break;
+    }
+    default:
+        return QWidget::event(event);
+    }
+    return true;
+}