QPA tablet event support

Should be sufficient to allow implementing the actual functionality in
xcb/cocoa/windows to match the Qt 4 level of tablet event support.

Task-number: QTBUG-25864
Change-Id: Iebcca256dfba841d8976b58fda1b76026d3133a3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

7 files changed, 238 insertions, 1 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 7bf5a7589f..05e1274fef 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -102,6 +102,9 @@ Qt::KeyboardModifiers QGuiApplicationPrivate::modifier_buttons = Qt::NoModifier;
 
 QPointF QGuiApplicationPrivate::lastCursorPosition(0.0, 0.0);
 
+bool QGuiApplicationPrivate::tabletState = false;
+QWindow *QGuiApplicationPrivate::tabletPressTarget = 0;
+
 QPlatformIntegration *QGuiApplicationPrivate::platform_integration = 0;
 QPlatformTheme *QGuiApplicationPrivate::platform_theme = 0;
 
@@ -1113,6 +1116,18 @@ void QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePriv
     case QWindowSystemInterfacePrivate::Expose:
         QGuiApplicationPrivate::processExposeEvent(static_cast<QWindowSystemInterfacePrivate::ExposeEvent *>(e));
         break;
+    case QWindowSystemInterfacePrivate::Tablet:
+        QGuiApplicationPrivate::processTabletEvent(
+                    static_cast<QWindowSystemInterfacePrivate::TabletEvent *>(e));
+        break;
+    case QWindowSystemInterfacePrivate::TabletEnterProximity:
+        QGuiApplicationPrivate::processTabletEnterProximityEvent(
+                    static_cast<QWindowSystemInterfacePrivate::TabletEnterProximityEvent *>(e));
+        break;
+    case QWindowSystemInterfacePrivate::TabletLeaveProximity:
+        QGuiApplicationPrivate::processTabletLeaveProximityEvent(
+                    static_cast<QWindowSystemInterfacePrivate::TabletLeaveProximityEvent *>(e));
+        break;
     default:
         qWarning() << "Unknown user input event type:" << e->type;
         break;
@@ -1439,6 +1454,81 @@ void QGuiApplicationPrivate::processFileOpenEvent(QWindowSystemInterfacePrivate:
     QGuiApplication::sendSpontaneousEvent(qApp, &event);
 }
 
+void QGuiApplicationPrivate::processTabletEvent(QWindowSystemInterfacePrivate::TabletEvent *e)
+{
+#ifndef QT_NO_TABLETEVENT
+    QEvent::Type type = QEvent::TabletMove;
+    if (e->down != tabletState) {
+        type = e->down ? QEvent::TabletPress : QEvent::TabletRelease;
+        tabletState = e->down;
+    }
+    QWindow *window = e->window.data();
+    bool localValid = true;
+    // If window is null, pick one based on the global position and make sure all
+    // subsequent events up to the release are delivered to that same window.
+    // If window is given, just send to that.
+    if (type == QEvent::TabletPress) {
+        if (!window) {
+            window = QGuiApplication::topLevelAt(e->global.toPoint());
+            localValid = false;
+        }
+        if (!window)
+            return;
+        tabletPressTarget = window;
+    } else {
+        if (!window) {
+            window = tabletPressTarget;
+            localValid = false;
+        }
+        if (type == QEvent::TabletRelease)
+            tabletPressTarget = 0;
+        if (!window)
+            return;
+    }
+    QPointF local = e->local;
+    if (!localValid) {
+        QPointF delta = e->global - e->global.toPoint();
+        local = window->mapFromGlobal(e->global.toPoint()) + delta;
+    }
+    QTabletEvent ev(type, local, e->global,
+                    e->device, e->pointerType, e->pressure, e->xTilt, e->yTilt,
+                    e->tangentialPressure, e->rotation, e->z,
+                    e->mods, e->uid);
+    ev.setTimestamp(e->timestamp);
+    QGuiApplication::sendSpontaneousEvent(window, &ev);
+#else
+    Q_UNUSED(e)
+#endif
+}
+
+void QGuiApplicationPrivate::processTabletEnterProximityEvent(QWindowSystemInterfacePrivate::TabletEnterProximityEvent *e)
+{
+#ifndef QT_NO_TABLETEVENT
+    QTabletEvent ev(QEvent::TabletEnterProximity, QPointF(), QPointF(),
+                    e->device, e->pointerType, 0, 0, 0,
+                    0, 0, 0,
+                    Qt::NoModifier, e->uid);
+    ev.setTimestamp(e->timestamp);
+    QGuiApplication::sendSpontaneousEvent(qGuiApp, &ev);
+#else
+    Q_UNUSED(e)
+#endif
+}
+
+void QGuiApplicationPrivate::processTabletLeaveProximityEvent(QWindowSystemInterfacePrivate::TabletLeaveProximityEvent *e)
+{
+#ifndef QT_NO_TABLETEVENT
+    QTabletEvent ev(QEvent::TabletLeaveProximity, QPointF(), QPointF(),
+                    e->device, e->pointerType, 0, 0, 0,
+                    0, 0, 0,
+                    Qt::NoModifier, e->uid);
+    ev.setTimestamp(e->timestamp);
+    QGuiApplication::sendSpontaneousEvent(qGuiApp, &ev);
+#else
+    Q_UNUSED(e)
+#endif
+}
+
 Q_GUI_EXPORT uint qHash(const QGuiApplicationPrivate::ActiveTouchPointsKey &k)
 {
     return qHash(k.device) + k.touchPointId;
diff --git a/src/gui/kernel/qguiapplication_p.h b/src/gui/kernel/qguiapplication_p.h
index 4ea95ee1a9..8b7977e87a 100644
--- a/src/gui/kernel/qguiapplication_p.h
+++ b/src/gui/kernel/qguiapplication_p.h
@@ -124,6 +124,10 @@ public:
 
     static void processFileOpenEvent(QWindowSystemInterfacePrivate::FileOpenEvent *e);
 
+    static void processTabletEvent(QWindowSystemInterfacePrivate::TabletEvent *e);
+    static void processTabletEnterProximityEvent(QWindowSystemInterfacePrivate::TabletEnterProximityEvent *e);
+    static void processTabletLeaveProximityEvent(QWindowSystemInterfacePrivate::TabletLeaveProximityEvent *e);
+
 #ifndef QT_NO_DRAGANDDROP
     static QPlatformDragQtResponse processDrag(QWindow *w, const QMimeData *dropData, const QPoint &p, Qt::DropActions supportedActions);
     static QPlatformDropQtResponse processDrop(QWindow *w, const QMimeData *dropData, const QPoint &p, Qt::DropActions supportedActions);
@@ -167,6 +171,8 @@ public:
     static int mousePressY;
     static int mouse_double_click_distance;
     static QPointF lastCursorPosition;
+    static bool tabletState;
+    static QWindow *tabletPressTarget;
 
 #ifndef QT_NO_CLIPBOARD
     static QClipboard *qt_clipboard;
diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index c9a49bf69b..8fe62bb7fd 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -1522,6 +1522,14 @@ bool QWindow::event(QEvent *ev)
         hideEvent(static_cast<QHideEvent *>(ev));
         break;
 
+#ifndef QT_NO_TABLETEVENT
+    case QEvent::TabletPress:
+    case QEvent::TabletMove:
+    case QEvent::TabletRelease:
+        tabletEvent(static_cast<QTabletEvent *>(ev));
+        break;
+#endif
+
     default:
         return QObject::event(ev);
     }
@@ -1628,6 +1636,19 @@ void QWindow::touchEvent(QTouchEvent *ev)
     ev->ignore();
 }
 
+#ifndef QT_NO_TABLETEVENT
+/*!
+    Override this to handle tablet press, move, and release events.
+
+    Proximity enter and leave events are not sent to windows, they are
+    delivered to the application instance.
+*/
+void QWindow::tabletEvent(QTabletEvent *ev)
+{
+    ev->ignore();
+}
+#endif
+
 /*!
     Override this to handle platform dependent events.
 
diff --git a/src/gui/kernel/qwindow.h b/src/gui/kernel/qwindow.h
index 9c70395d08..fab9e4658b 100644
--- a/src/gui/kernel/qwindow.h
+++ b/src/gui/kernel/qwindow.h
@@ -78,6 +78,9 @@ class QMouseEvent;
 class QWheelEvent;
 #endif
 class QTouchEvent;
+#ifndef QT_NO_TABLETEVENT
+class QTabletEvent;
+#endif
 
 class QPlatformSurface;
 class QPlatformWindow;
@@ -302,6 +305,9 @@ protected:
     virtual void wheelEvent(QWheelEvent *);
 #endif
     virtual void touchEvent(QTouchEvent *);
+#ifndef QT_NO_TABLETEVENT
+    virtual void tabletEvent(QTabletEvent *);
+#endif
     virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result);
 
     QWindow(QWindowPrivate &dd, QWindow *parent);
diff --git a/src/gui/kernel/qwindowsysteminterface_qpa.cpp b/src/gui/kernel/qwindowsysteminterface_qpa.cpp
index 3054b9610d..c707d4eea2 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa.cpp
+++ b/src/gui/kernel/qwindowsysteminterface_qpa.cpp
@@ -528,4 +528,52 @@ void QWindowSystemInterface::handleFileOpenEvent(const QString& fileName)
     QGuiApplicationPrivate::processWindowSystemEvent(&e);
 }
 
+void QWindowSystemInterface::handleTabletEvent(QWindow *w, ulong timestamp, bool down, const QPointF &local, const QPointF &global,
+                                               int device, int pointerType, qreal pressure, int xTilt, int yTilt,
+                                               qreal tangentialPressure, qreal rotation, int z, qint64 uid,
+                                               Qt::KeyboardModifiers modifiers)
+{
+    QWindowSystemInterfacePrivate::TabletEvent *e =
+            new QWindowSystemInterfacePrivate::TabletEvent(w, timestamp, down, local, global, device, pointerType, pressure,
+                                                           xTilt, yTilt, tangentialPressure, rotation, z, uid, modifiers);
+    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
+}
+
+void QWindowSystemInterface::handleTabletEvent(QWindow *w, bool down, const QPointF &local, const QPointF &global,
+                                               int device, int pointerType, qreal pressure, int xTilt, int yTilt,
+                                               qreal tangentialPressure, qreal rotation, int z, qint64 uid,
+                                               Qt::KeyboardModifiers modifiers)
+{
+    ulong time = QWindowSystemInterfacePrivate::eventTime.elapsed();
+    handleTabletEvent(w, time, down, local, global, device, pointerType, pressure,
+                      xTilt, yTilt, tangentialPressure, rotation, z, uid, modifiers);
+}
+
+void QWindowSystemInterface::handleTabletEnterProximityEvent(ulong timestamp, int device, int pointerType, qint64 uid)
+{
+    QWindowSystemInterfacePrivate::TabletEnterProximityEvent *e =
+            new QWindowSystemInterfacePrivate::TabletEnterProximityEvent(timestamp, device, pointerType, uid);
+    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
+}
+
+void QWindowSystemInterface::handleTabletEnterProximityEvent(int device, int pointerType, qint64 uid)
+{
+    ulong time = QWindowSystemInterfacePrivate::eventTime.elapsed();
+    handleTabletEnterProximityEvent(time, device, pointerType, uid);
+}
+
+void QWindowSystemInterface::handleTabletLeaveProximityEvent(ulong timestamp, int device, int pointerType, qint64 uid)
+{
+    QWindowSystemInterfacePrivate::TabletLeaveProximityEvent *e =
+            new QWindowSystemInterfacePrivate::TabletLeaveProximityEvent(timestamp, device, pointerType, uid);
+    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
+}
+
+void QWindowSystemInterface::handleTabletLeaveProximityEvent(int device, int pointerType, qint64 uid)
+{
+    ulong time = QWindowSystemInterfacePrivate::eventTime.elapsed();
+    handleTabletLeaveProximityEvent(time, device, pointerType, uid);
+}
+
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qwindowsysteminterface_qpa.h b/src/gui/kernel/qwindowsysteminterface_qpa.h
index 41e5a599c7..34587f67d8 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa.h
+++ b/src/gui/kernel/qwindowsysteminterface_qpa.h
@@ -152,6 +152,20 @@ public:
 
     static void handleFileOpenEvent(const QString& fileName);
 
+    static void handleTabletEvent(QWindow *w, ulong timestamp, bool down, const QPointF &local, const QPointF &global,
+                                  int device, int pointerType, qreal pressure, int xTilt, int yTilt,
+                                  qreal tangentialPressure, qreal rotation, int z, qint64 uid,
+                                  Qt::KeyboardModifiers modifiers = Qt::NoModifier);
+    static void handleTabletEvent(QWindow *w, bool down, const QPointF &local, const QPointF &global,
+                                  int device, int pointerType, qreal pressure, int xTilt, int yTilt,
+                                  qreal tangentialPressure, qreal rotation, int z, qint64 uid,
+                                  Qt::KeyboardModifiers modifiers = Qt::NoModifier);
+    static void handleTabletEnterProximityEvent(ulong timestamp, int device, int pointerType, qint64 uid);
+    static void handleTabletEnterProximityEvent(int device, int pointerType, qint64 uid);
+    static void handleTabletLeaveProximityEvent(ulong timestamp, int device, int pointerType, qint64 uid);
+    static void handleTabletLeaveProximityEvent(int device, int pointerType, qint64 uid);
+
+
     // For event dispatcher implementations
     static bool sendWindowSystemEvents(QAbstractEventDispatcher *eventDispatcher, QEventLoop::ProcessEventsFlags flags);
     static int windowSystemEventsQueued();
diff --git a/src/gui/kernel/qwindowsysteminterface_qpa_p.h b/src/gui/kernel/qwindowsysteminterface_qpa_p.h
index f026f1ca33..3eebaf2dfc 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa_p.h
+++ b/src/gui/kernel/qwindowsysteminterface_qpa_p.h
@@ -69,7 +69,10 @@ public:
         ScreenRefreshRate,
         ThemeChange,
         Expose,
-        FileOpen
+        FileOpen,
+        Tablet,
+        TabletEnterProximity,
+        TabletLeaveProximity
     };
 
     class WindowSystemEvent {
@@ -266,6 +269,55 @@ public:
         QString fileName;
     };
 
+    class TabletEvent : public InputEvent {
+    public:
+        static void handleTabletEvent(QWindow *w, bool down, const QPointF &local, const QPointF &global,
+                                      int device, int pointerType, qreal pressure, int xTilt, int yTilt,
+                                      qreal tangentialPressure, qreal rotation, int z, qint64 uid,
+                                      Qt::KeyboardModifiers modifiers = Qt::NoModifier);
+
+        TabletEvent(QWindow *w, ulong time, bool down, const QPointF &local, const QPointF &global,
+                    int device, int pointerType, qreal pressure, int xTilt, int yTilt, qreal tpressure,
+                    qreal rotation, int z, qint64 uid, Qt::KeyboardModifiers mods)
+            : InputEvent(w, time, Tablet, Qt::NoModifier),
+              down(down), local(local), global(global), device(device), pointerType(pointerType),
+              pressure(pressure), xTilt(xTilt), yTilt(yTilt), tangentialPressure(tpressure),
+              rotation(rotation), z(z), uid(uid), mods(mods) { }
+        bool down;
+        QPointF local;
+        QPointF global;
+        int device;
+        int pointerType;
+        qreal pressure;
+        int xTilt;
+        int yTilt;
+        qreal tangentialPressure;
+        qreal rotation;
+        int z;
+        qint64 uid;
+        Qt::KeyboardModifiers mods;
+    };
+
+    class TabletEnterProximityEvent : public InputEvent {
+    public:
+        TabletEnterProximityEvent(ulong time, int device, int pointerType, qint64 uid)
+            : InputEvent(0, time, TabletEnterProximity, Qt::NoModifier),
+              device(device), pointerType(pointerType), uid(uid) { }
+        int device;
+        int pointerType;
+        qint64 uid;
+    };
+
+    class TabletLeaveProximityEvent : public InputEvent {
+    public:
+        TabletLeaveProximityEvent(ulong time, int device, int pointerType, qint64 uid)
+            : InputEvent(0, time, TabletLeaveProximity, Qt::NoModifier),
+              device(device), pointerType(pointerType), uid(uid) { }
+        int device;
+        int pointerType;
+        qint64 uid;
+    };
+
     static QList<WindowSystemEvent *> windowSystemEventQueue;
     static QMutex queueMutex;