diff options
Diffstat (limited to 'src/widgets/kernel/qstandardgestures.cpp')
| -rw-r--r-- | src/widgets/kernel/qstandardgestures.cpp | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/src/widgets/kernel/qstandardgestures.cpp b/src/widgets/kernel/qstandardgestures.cpp index 6656903e70..d19e473d18 100644 --- a/src/widgets/kernel/qstandardgestures.cpp +++ b/src/widgets/kernel/qstandardgestures.cpp @@ -1,7 +1,7 @@ /**************************************************************************** ** -** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/legal +** Copyright (C) 2015 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ ** ** This file is part of the QtWidgets module of the Qt Toolkit. ** @@ -10,9 +10,9 @@ ** 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. +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser @@ -23,8 +23,8 @@ ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and ** 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 +** As a special exception, The Qt Company gives you certain additional +** rights. These rights are described in The Qt Company LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** $QT_END_LICENSE$ @@ -44,6 +44,11 @@ QT_BEGIN_NAMESPACE +// If the change in scale for a single touch event is out of this range, +// we consider it to be spurious. +static const qreal kSingleStepScaleMax = 2.0; +static const qreal kSingleStepScaleMin = 0.1; + QGesture *QPanGestureRecognizer::create(QObject *target) { if (target && target->isWidgetType()) { @@ -197,7 +202,10 @@ QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state, d->lastScaleFactor = d->scaleFactor; QLineF line(p1.screenPos(), p2.screenPos()); QLineF lastLine(p1.lastScreenPos(), p2.lastScreenPos()); - d->scaleFactor = line.length() / lastLine.length(); + qreal newScaleFactor = line.length() / lastLine.length(); + if (newScaleFactor > kSingleStepScaleMax || newScaleFactor < kSingleStepScaleMin) + return QGestureRecognizer::Ignore; + d->scaleFactor = newScaleFactor; } d->totalScaleFactor = d->totalScaleFactor * d->scaleFactor; d->changeFlags |= QPinchGesture::ScaleFactorChanged; |