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Diffstat (limited to 'src/quick/handlers/qquickdraghandler_p.h')
-rw-r--r-- | src/quick/handlers/qquickdraghandler_p.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/quick/handlers/qquickdraghandler_p.h b/src/quick/handlers/qquickdraghandler_p.h new file mode 100644 index 0000000000..387a81eb43 --- /dev/null +++ b/src/quick/handlers/qquickdraghandler_p.h @@ -0,0 +1,110 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQuick 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 The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/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 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QQUICKDRAGHANDLER_H +#define QQUICKDRAGHANDLER_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include "qquickmultipointhandler_p.h" +#include "qquickdragaxis_p.h" + +QT_BEGIN_NAMESPACE + +class Q_AUTOTEST_EXPORT QQuickDragHandler : public QQuickMultiPointHandler +{ + Q_OBJECT + Q_PROPERTY(QQuickDragAxis * xAxis READ xAxis CONSTANT) + Q_PROPERTY(QQuickDragAxis * yAxis READ yAxis CONSTANT) + Q_PROPERTY(QVector2D translation READ translation NOTIFY translationChanged) + +public: + explicit QQuickDragHandler(QQuickItem *parent = nullptr); + + void handlePointerEventImpl(QQuickPointerEvent *event) override; + + QQuickDragAxis *xAxis() { return &m_xAxis; } + QQuickDragAxis *yAxis() { return &m_yAxis; } + + QVector2D translation() const { return m_translation; } + void setTranslation(const QVector2D &trans); + + void enforceConstraints(); + +Q_SIGNALS: + void translationChanged(); + +protected: + void onActiveChanged() override; + void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabTransition transition, QQuickEventPoint *point) override; + +private: + void ungrab(); + void enforceAxisConstraints(QPointF *localPos); + bool targetContainsCentroid(); + QPointF targetCentroidPosition(); + +private: + QPointF m_pressTargetPos; // We must also store the local targetPos, because we cannot deduce + // the press target pos from the scene pos in case there was e.g a + // flick in one of the ancestors during the drag. + QVector2D m_translation; + + QQuickDragAxis m_xAxis; + QQuickDragAxis m_yAxis; + bool m_pressedInsideTarget = false; + + friend class QQuickDragAxis; +}; + +QT_END_NAMESPACE + +QML_DECLARE_TYPE(QQuickDragHandler) +QML_DECLARE_TYPE(QQuickDragAxis) + +#endif // QQUICKDRAGHANDLER_H |