Tablet example: update the cursor according to the tool

Change-Id: Ibbe530856bb833e465dd9fa1da5425c018fecc21
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

examples/widgets/widgets/tablet/images.qrc

@@ -0,0 +1,8 @@
+<RCC>
+    <qresource>
+        <file>images/cursor-airbrush.png</file>
+        <file>images/cursor-eraser.png</file>
+        <file>images/cursor-felt-marker.png</file>
+        <file>images/cursor-pencil.png</file>
+    </qresource>
+</RCC>

examples/widgets/widgets/tablet/tablet.pro

@@ -1,12 +1,13 @@
 QT += widgets
 
 HEADERS	    =	mainwindow.h \
-		tabletcanvas.h \
-		tabletapplication.h
+        tabletcanvas.h \
+        tabletapplication.h
 SOURCES	    =	mainwindow.cpp \
-		main.cpp \
-		tabletcanvas.cpp \
-		tabletapplication.cpp
+        main.cpp \
+        tabletcanvas.cpp \
+        tabletapplication.cpp
+RESOURCES += images.qrc
 
 # install
 target.path = $$[QT_INSTALL_EXAMPLES]/widgets/widgets/tablet

examples/widgets/widgets/tablet/tabletapplication.cpp

@@ -47,8 +47,7 @@ bool TabletApplication::event(QEvent *event)
 {
     if (event->type() == QEvent::TabletEnterProximity ||
         event->type() == QEvent::TabletLeaveProximity) {
-        myCanvas->setTabletDevice(
-            static_cast<QTabletEvent *>(event)->device());
+        myCanvas->setTabletDevice(static_cast<QTabletEvent *>(event));
         return true;
     }
     return QApplication::event(event);

examples/widgets/widgets/tablet/tabletcanvas.cpp

@@ -103,6 +103,8 @@ void TabletCanvas::tabletEvent(QTabletEvent *event)
             }
             break;
         case QEvent::TabletMove:
+            if (event->device() == QTabletEvent::RotationStylus)
+                updateCursor(event);
             if (deviceDown) {
                 updateBrush(event);
                 QPainter painter(&pixmap);
@@ -201,7 +203,7 @@ void TabletCanvas::paintPixmap(QPainter &painter, QTabletEvent *event)
 //! [5]
 
 //! [7]
-void TabletCanvas::updateBrush(QTabletEvent *event)
+void TabletCanvas::updateBrush(const QTabletEvent *event)
 {
     int hue, saturation, value, alpha;
     myColor.getHsv(&hue, &saturation, &value, &alpha);
@@ -266,6 +268,46 @@ void TabletCanvas::updateBrush(QTabletEvent *event)
 }
 //! [11]
 
+void TabletCanvas::updateCursor(const QTabletEvent *event)
+{
+    QCursor cursor;
+    if (event->type() != QEvent::TabletLeaveProximity) {
+        if (event->pointerType() == QTabletEvent::Eraser) {
+            cursor = QCursor(QPixmap(":/images/cursor-eraser.png"), 3, 28);
+        } else {
+            switch (event->device()) {
+            case QTabletEvent::Stylus:
+                cursor = QCursor(QPixmap(":/images/cursor-pencil.png"), 0, 0);
+                break;
+            case QTabletEvent::Airbrush:
+                cursor = QCursor(QPixmap(":/images/cursor-airbrush.png"), 3, 4);
+                break;
+            case QTabletEvent::RotationStylus: {
+                QImage origImg(QLatin1String(":/images/cursor-felt-marker.png"));
+                QImage img(32, 32, QImage::Format_ARGB32);
+                QColor solid = myColor;
+                solid.setAlpha(255);
+                img.fill(solid);
+                QPainter painter(&img);
+                QTransform transform = painter.transform();
+                transform.translate(16, 16);
+                transform.rotate(-event->rotation());
+                painter.setTransform(transform);
+                painter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
+                painter.drawImage(-24, -24, origImg);
+                painter.setCompositionMode(QPainter::CompositionMode_HardLight);
+                painter.drawImage(-24, -24, origImg);
+                painter.end();
+                cursor = QCursor(QPixmap::fromImage(img), 16, 16);
+            } break;
+            default:
+                break;
+            }
+        }
+    }
+    setCursor(cursor);
+}
+
 void TabletCanvas::resizeEvent(QResizeEvent *)
 {
     initPixmap();

examples/widgets/widgets/tablet/tabletcanvas.h

@@ -80,8 +80,8 @@ public:
         { myColor = color; }
     QColor color() const
         { return myColor; }
-    void setTabletDevice(QTabletEvent::TabletDevice device)
-        { myTabletDevice = device; }
+    void setTabletDevice(QTabletEvent *event)
+        { myTabletDevice = event->device(); updateCursor(event); }
     int maximum(int a, int b)
         { return a > b ? a : b; }
 
@@ -94,7 +94,8 @@ private:
     void initPixmap();
     void paintPixmap(QPainter &painter, QTabletEvent *event);
     Qt::BrushStyle brushPattern(qreal value);
-    void updateBrush(QTabletEvent *event);
+    void updateBrush(const QTabletEvent *event);
+    void updateCursor(const QTabletEvent *event);
 
     AlphaChannelType alphaChannelType;
     ColorSaturationType colorSaturationType;