Mac: implement gestures conforming to the new API

1 files changed, 258 insertions, 0 deletions

diff --git a/src/gui/kernel/qmacgesturerecognizer_mac.mm b/src/gui/kernel/qmacgesturerecognizer_mac.mm
new file mode 100644
index 0000000000..583fc9351d
--- /dev/null
+++ b/src/gui/kernel/qmacgesturerecognizer_mac.mm
@@ -0,0 +1,258 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmacgesturerecognizer_mac_p.h"
+#include "qgesture.h"
+#include "qgesture_p.h"
+#include "qevent.h"
+#include "qevent_p.h"
+#include "qwidget.h"
+#include "qdebug.h"
+
+QT_BEGIN_NAMESPACE
+
+QMacSwipeGestureRecognizer::QMacSwipeGestureRecognizer()
+{
+}
+
+QGesture *QMacSwipeGestureRecognizer::createGesture(QObject * /*target*/)
+{
+    return new QSwipeGesture;
+}
+
+QGestureRecognizer::Result
+QMacSwipeGestureRecognizer::filterEvent(QGesture *gesture, QObject *obj, QEvent *event)
+{
+    if (event->type() == QEvent::NativeGesture && obj->isWidgetType()) {
+        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
+        switch (ev->gestureType) {
+            case QNativeGestureEvent::Swipe: {
+                QSwipeGesture *g = static_cast<QSwipeGesture *>(gesture);
+                g->setSwipeAngle(ev->angle);
+                return QGestureRecognizer::GestureTriggered | 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::createGesture(QObject * /*target*/)
+{
+    return new QPinchGesture;
+}
+
+QGestureRecognizer::Result
+QMacPinchGestureRecognizer::filterEvent(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 QNativeGestureEvent::GestureBegin:
+            reset(gesture);
+            g->setStartCenterPoint(static_cast<QWidget*>(obj)->mapFromGlobal(ev->position));
+            g->setCenterPoint(g->startCenterPoint());
+            g->setWhatChanged(QPinchGesture::CenterPointChanged);
+            return QGestureRecognizer::MaybeGesture | QGestureRecognizer::ConsumeEventHint;
+        case QNativeGestureEvent::Rotate: {
+            g->setLastScaleFactor(g->scaleFactor());
+            g->setLastRotationAngle(g->rotationAngle());
+            g->setRotationAngle(g->rotationAngle() + ev->percentage);
+            g->setWhatChanged(QPinchGesture::RotationAngleChanged);
+            return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;
+            break;
+        }
+        case QNativeGestureEvent::Zoom:
+            g->setLastScaleFactor(g->scaleFactor());
+            g->setLastRotationAngle(g->rotationAngle());
+            g->setScaleFactor(g->scaleFactor() + ev->percentage);
+            g->setWhatChanged(QPinchGesture::ScaleFactorChanged);
+            return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;
+            break;
+        case QNativeGestureEvent::GestureEnd:
+            return QGestureRecognizer::GestureFinished | QGestureRecognizer::ConsumeEventHint;
+            break;
+        default:
+            break;
+        }
+    }
+
+    return QGestureRecognizer::Ignore;
+}
+
+void QMacPinchGestureRecognizer::reset(QGesture *gesture)
+{
+    QPinchGesture *g = static_cast<QPinchGesture *>(gesture);
+    g->setWhatChanged(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);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+#if defined(QT_MAC_USE_COCOA)
+
+QMacPanGestureRecognizer::QMacPanGestureRecognizer() : _panCanceled(true)
+{
+}
+
+QGesture *QMacPanGestureRecognizer::createGesture(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::filterEvent(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();
+            _lastPos = _startPos;
+            _panTimer.start(panBeginDelay, target);
+            _panCanceled = false;
+            return QGestureRecognizer::MaybeGesture;
+        }
+        break;}
+    case QEvent::TouchEnd: {
+        const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+        if (!_panCanceled && ev->touchPoints().size() == 1)
+                return QGestureRecognizer::GestureFinished;
+        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::NotGesture;
+                }
+            } else {
+                const QPointF p = QCursor::pos();
+                const QPointF posOffset = p - _lastPos;
+                g->setLastOffset(g->offset());
+                g->setOffset(QSizeF(posOffset.x(), posOffset.y()));
+                g->setTotalOffset(g->lastOffset() + g->offset());
+                _lastPos = p;
+                return QGestureRecognizer::GestureTriggered;
+            }
+        }
+        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();
+            _lastPos = _startPos;
+            return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;
+        }
+        break; }
+    default:
+        break;
+    }
+
+    return QGestureRecognizer::Ignore;
+}
+
+void QMacPanGestureRecognizer::reset(QGesture *gesture)
+{
+    QPanGesture *g = static_cast<QPanGesture *>(gesture);
+    _startPos = QPointF();
+    _lastPos = QPointF();
+    _panCanceled = true;
+    g->setOffset(QSizeF(0, 0));
+    g->setLastOffset(QSizeF(0, 0));
+    g->setTotalOffset(QSizeF(0, 0));
+    g->setAcceleration(qreal(1));
+    QGestureRecognizer::reset(gesture);
+}
+#endif // QT_MAC_USE_COCOA
+
+QT_END_NAMESPACE