Implement native gestures on OS X.

Add QWindowSystemInterface::GestureEvent and
QNativeGestureEvent to QtGui. These events are copies
of Qt4's QNativeGestureEvent, where it was an implementation
detail of QGestureManager.

Add gesture message handlers to QNSView and bring
back the Mac gesture recognizers for QGestureManager.

Task-number: QTBUG-28126
Change-Id: I1304e09e776fa7c44d133d54ca8b895ca2f544c5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

1 files changed, 275 insertions, 0 deletions

diff --git a/src/widgets/kernel/qmacgesturerecognizer.cpp b/src/widgets/kernel/qmacgesturerecognizer.cpp
new file mode 100644
index 0000000000..feb779e53f
--- /dev/null
+++ b/src/widgets/kernel/qmacgesturerecognizer.cpp
@@ -0,0 +1,275 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtWidgets module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmacgesturerecognizer_p.h"
+#include "qgesture.h"
+#include "qgesture_p.h"
+#include "qevent.h"
+#include "qwidget.h"
+#include "qdebug.h"
+
+#ifndef QT_NO_GESTURES
+
+QT_BEGIN_NAMESPACE
+
+QMacSwipeGestureRecognizer::QMacSwipeGestureRecognizer()
+{
+}
+
+QGesture *QMacSwipeGestureRecognizer::create(QObject * /*target*/)
+{
+    return new QSwipeGesture;
+}
+
+QGestureRecognizer::Result
+QMacSwipeGestureRecognizer::recognize(QGesture *gesture, QObject *obj, QEvent *event)
+{
+    if (event->type() == QEvent::NativeGesture && obj->isWidgetType()) {
+        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
+        switch (ev->gestureType()) {
+            case Qt::SwipeNativeGesture: {
+                QSwipeGesture *g = static_cast<QSwipeGesture *>(gesture);
+                g->setSwipeAngle(ev->value());
+                g->setHotSpot(ev->screenPos());
+                return QGestureRecognizer::FinishGesture | QGestureRecognizer::ConsumeEventHint;
+                break; }
+            default:
+                break;
+        }
+    }
+
+    return QGestureRecognizer::Ignore;
+}
+
+void QMacSwipeGestureRecognizer::reset(QGesture *gesture)
+{
+    QSwipeGesture *g = static_cast<QSwipeGesture *>(gesture);
+    g->setSwipeAngle(0);
+    QGestureRecognizer::reset(gesture);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+QMacPinchGestureRecognizer::QMacPinchGestureRecognizer()
+{
+}
+
+QGesture *QMacPinchGestureRecognizer::create(QObject * /*target*/)
+{
+    return new QPinchGesture;
+}
+
+QGestureRecognizer::Result
+QMacPinchGestureRecognizer::recognize(QGesture *gesture, QObject *obj, QEvent *event)
+{
+    if (event->type() == QEvent::NativeGesture && obj->isWidgetType()) {
+        QPinchGesture *g = static_cast<QPinchGesture *>(gesture);
+        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
+        switch (ev->gestureType()) {
+        case Qt::BeginNativeGesture:
+            reset(gesture);
+            g->setStartCenterPoint(static_cast<QWidget*>(obj)->mapFromGlobal(ev->screenPos().toPoint()));
+            g->setCenterPoint(g->startCenterPoint());
+            g->setChangeFlags(QPinchGesture::CenterPointChanged);
+            g->setTotalChangeFlags(g->totalChangeFlags() | g->changeFlags());
+            g->setHotSpot(ev->screenPos());
+            return QGestureRecognizer::MayBeGesture | QGestureRecognizer::ConsumeEventHint;
+        case Qt::RotateNativeGesture:
+            g->setLastScaleFactor(g->scaleFactor());
+            g->setLastRotationAngle(g->rotationAngle());
+            g->setRotationAngle(g->rotationAngle() + ev->value());
+            g->setChangeFlags(QPinchGesture::RotationAngleChanged);
+            g->setTotalChangeFlags(g->totalChangeFlags() | g->changeFlags());
+            g->setHotSpot(ev->screenPos());
+            return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+        case Qt::ZoomNativeGesture:
+            g->setLastScaleFactor(g->scaleFactor());
+            g->setLastRotationAngle(g->rotationAngle());
+            g->setScaleFactor(g->scaleFactor() * (1 + ev->value()));
+            g->setChangeFlags(QPinchGesture::ScaleFactorChanged);
+            g->setTotalChangeFlags(g->totalChangeFlags() | g->changeFlags());
+            g->setHotSpot(ev->screenPos());
+            return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+        case Qt::SmartZoomNativeGesture:
+            g->setLastScaleFactor(g->scaleFactor());
+            g->setLastRotationAngle(g->rotationAngle());
+            g->setScaleFactor(ev->value() ? 1.7f : 1.0f);
+            g->setChangeFlags(QPinchGesture::ScaleFactorChanged);
+            g->setTotalChangeFlags(g->totalChangeFlags() | g->changeFlags());
+            g->setHotSpot(ev->screenPos());
+            return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+        case Qt::EndNativeGesture:
+            return QGestureRecognizer::FinishGesture | QGestureRecognizer::ConsumeEventHint;
+        default:
+            break;
+        }
+    }
+
+    return QGestureRecognizer::Ignore;
+}
+
+void QMacPinchGestureRecognizer::reset(QGesture *gesture)
+{
+    QPinchGesture *g = static_cast<QPinchGesture *>(gesture);
+    g->setChangeFlags(0);
+    g->setTotalChangeFlags(0);
+    g->setScaleFactor(1.0f);
+    g->setTotalScaleFactor(1.0f);
+    g->setLastScaleFactor(1.0f);
+    g->setRotationAngle(0.0f);
+    g->setTotalRotationAngle(0.0f);
+    g->setLastRotationAngle(0.0f);
+    g->setCenterPoint(QPointF());
+    g->setStartCenterPoint(QPointF());
+    g->setLastCenterPoint(QPointF());
+    QGestureRecognizer::reset(gesture);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+QMacPanGestureRecognizer::QMacPanGestureRecognizer() : _panCanceled(true)
+{
+}
+
+QGesture *QMacPanGestureRecognizer::create(QObject *target)
+{
+    if (!target)
+        return new QPanGesture;
+
+    if (QWidget *w = qobject_cast<QWidget *>(target)) {
+        w->setAttribute(Qt::WA_AcceptTouchEvents);
+        w->setAttribute(Qt::WA_TouchPadAcceptSingleTouchEvents);
+        return new QPanGesture;
+    }
+    return 0;
+}
+
+QGestureRecognizer::Result
+QMacPanGestureRecognizer::recognize(QGesture *gesture, QObject *target, QEvent *event)
+{
+    const int panBeginDelay = 300;
+    const int panBeginRadius = 3;
+
+    QPanGesture *g = static_cast<QPanGesture *>(gesture);
+
+    switch (event->type()) {
+    case QEvent::TouchBegin: {
+        const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+        if (ev->touchPoints().size() == 1) {
+            reset(gesture);
+            _startPos = QCursor::pos();
+            _panTimer.start(panBeginDelay, target);
+            _panCanceled = false;
+            return QGestureRecognizer::MayBeGesture;
+        }
+        break;}
+    case QEvent::TouchEnd: {
+        if (_panCanceled)
+            break;
+
+        const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+        if (ev->touchPoints().size() == 1)
+            return QGestureRecognizer::FinishGesture;
+        break;}
+    case QEvent::TouchUpdate: {
+        if (_panCanceled)
+            break;
+
+        const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+        if (ev->touchPoints().size() == 1) {
+            if (_panTimer.isActive()) {
+                // INVARIANT: Still in maybeGesture. Check if the user
+                // moved his finger so much that it makes sense to cancel the pan:
+                const QPointF p = QCursor::pos();
+                if ((p - _startPos).manhattanLength() > panBeginRadius) {
+                    _panCanceled = true;
+                    _panTimer.stop();
+                    return QGestureRecognizer::CancelGesture;
+                }
+            } else {
+                const QPointF p = QCursor::pos();
+                const QPointF posOffset = p - _startPos;
+                g->setLastOffset(g->offset());
+                g->setOffset(QPointF(posOffset.x(), posOffset.y()));
+                g->setHotSpot(_startPos);
+                return QGestureRecognizer::TriggerGesture;
+            }
+        } else if (_panTimer.isActive()) {
+            // I only want to cancel the pan if the user is pressing
+            // more than one finger, and the pan hasn't started yet:
+            _panCanceled = true;
+            _panTimer.stop();
+            return QGestureRecognizer::CancelGesture;
+        }
+        break;}
+    case QEvent::Timer: {
+        QTimerEvent *ev = static_cast<QTimerEvent *>(event);
+        if (ev->timerId() == _panTimer.timerId()) {
+            _panTimer.stop();
+            if (_panCanceled)
+                break;
+            // Begin new pan session!
+            _startPos = QCursor::pos();
+            g->setHotSpot(_startPos);
+            return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+        }
+        break; }
+    default:
+        break;
+    }
+
+    return QGestureRecognizer::Ignore;
+}
+
+void QMacPanGestureRecognizer::reset(QGesture *gesture)
+{
+    QPanGesture *g = static_cast<QPanGesture *>(gesture);
+    _startPos = QPointF();
+    _panCanceled = true;
+    g->setOffset(QPointF(0, 0));
+    g->setLastOffset(QPointF(0, 0));
+    g->setAcceleration(qreal(1));
+    QGestureRecognizer::reset(gesture);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GESTURES