Flickable: Use increased default flick parameters on BB10

Due to the high resolution the display default flicking speed
is rather slow. This change introduces increased values of
QML_FLICK_DEFAULTMAXVELOCITY and QML_FLICK_DEFAULTDECELERATION
which feel closer to the native experience.

Also cleans up the flick variables a little by moving them to
their own header, so that QQuickPathView can also benefit from
the improved behavior on BB10.

Change-Id: I80878d4cc2a53a8f530b1dc8674f729f70a83119
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>

1 files changed, 105 insertions, 0 deletions

diff --git a/src/quick/items/qquickflickablebehavior_p.h b/src/quick/items/qquickflickablebehavior_p.h
new file mode 100644
index 0000000000..317d6512e6
--- /dev/null
+++ b/src/quick/items/qquickflickablebehavior_p.h
@@ -0,0 +1,105 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Research In Motion.
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQml 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKFLICKABLEBEHAVIOR_H
+#define QQUICKFLICKABLEBEHAVIOR_H
+
+/* ### Platform specific flickable mechanics are defined either here, or in
+       mkspec files. Long-term (QtQuick 3) Flickable needs to allow such
+       mechanic details to be controlled via QML so that platforms can easily
+       load custom behavior at QML compile time.
+*/
+
+// The maximum number of pixels a flick can overshoot
+#ifndef QML_FLICK_OVERSHOOT
+#define QML_FLICK_OVERSHOOT 150
+#endif
+
+// The number of samples to use in calculating the velocity of a flick
+#ifndef QML_FLICK_SAMPLEBUFFER
+#define QML_FLICK_SAMPLEBUFFER 3
+#endif
+
+// The number of samples to discard when calculating the flick velocity.
+// Touch panels often produce inaccurate results as the finger is lifted.
+#ifndef QML_FLICK_DISCARDSAMPLES
+#define QML_FLICK_DISCARDSAMPLES 0
+#endif
+
+// The default maximum velocity of a flick.
+#ifndef QML_FLICK_DEFAULTMAXVELOCITY
+#ifdef Q_OS_BLACKBERRY
+#define QML_FLICK_DEFAULTMAXVELOCITY 10000
+#else
+#define QML_FLICK_DEFAULTMAXVELOCITY 2500
+#endif
+#endif
+
+// The default deceleration of a flick.
+#ifndef QML_FLICK_DEFAULTDECELERATION
+#ifdef Q_OS_BLACKBERRY
+#define QML_FLICK_DEFAULTDECELERATION 5000
+#else
+#define QML_FLICK_DEFAULTDECELERATION 1500
+#endif
+#endif
+
+// How much faster to decelerate when overshooting
+#ifndef QML_FLICK_OVERSHOOTFRICTION
+#define QML_FLICK_OVERSHOOTFRICTION 8
+#endif
+
+// Multiflick acceleration minimum flick velocity threshold
+#ifndef QML_FLICK_MULTIFLICK_THRESHOLD
+#define QML_FLICK_MULTIFLICK_THRESHOLD 1250
+#endif
+
+// Multiflick acceleration minimum contentSize/viewSize ratio
+#ifndef QML_FLICK_MULTIFLICK_RATIO
+#define QML_FLICK_MULTIFLICK_RATIO 10
+#endif
+
+// Multiflick acceleration maximum velocity multiplier
+#ifndef QML_FLICK_MULTIFLICK_MAXBOOST
+#define QML_FLICK_MULTIFLICK_MAXBOOST 3.0
+#endif
+
+#endif //QQUICKFLICKABLEBEHAVIOR_H