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Diffstat (limited to 'src/threed/scene/qglpicknode.cpp')
| -rw-r--r-- | src/threed/scene/qglpicknode.cpp | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/threed/scene/qglpicknode.cpp b/src/threed/scene/qglpicknode.cpp new file mode 100644 index 000000000..06a4245b3 --- /dev/null +++ b/src/threed/scene/qglpicknode.cpp @@ -0,0 +1,215 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtQuick3D 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 "qglpicknode.h" +#include "qglabstractscene.h" + +#include <QtGui/qevent.h> + +/*! + \class QGLPickNode + \brief The QGLPickNode class enables picking for objects in a 3D scene. + \since 4.8 + \ingroup qt3d + \ingroup qt3d::scene + + QGLPickNode is a QObject sub-class, relatively light-weight, that can + shadow QSceneObject instances and provide picking capability. The + QGLPickNode instance receives events sent to it by picking views, such + as the QGLView class, and emits relevant signals in response. + + QGLSceneObjects wanting to support picking, should implement the methods + \list + \o QGLSceneNode::pickNode() + \o QGLSceneNode::setPickNode() + \endlist + and also implement rendering such that the QGLPainter has the relevant + \l{QGLPainter::setObjectPickId()}{pick id function} called. + + These functions are already implemented for the QGLSceneNode object type. + + Picking can then be simply enabled by calling the QGLAbstractScene function + setPickable() to turn on picking and generate pick nodes for the relevant + scene objects. + + In order to respond to picking, the view class should simply register the + picknodes, and connect a relevant slot to the pick nodes signal. + + For the QGLView class that code is simply: + \code + QList<QGLPickNode *>nodes = manager->pickNodes(); + foreach (QGLPickNode *node, nodes) + { + registerObject(node->id(), node); + connect(node, SIGNAL(clicked()), + this, SLOT(objectPicked())); + } + \endcode + + The pick nodes should be unregistered with similar code for the QGLView if + switching to a different scene. + + To be able to recover the relevant QGLSceneNode inside the called slot, + the object may be set onto the QGLPickNode with the setTarget() function, + and recovered with target() inside the slot, since the QGLPickNode will + be the sender() for the slot. + + QGLSceneNode already sets itself as the target during the pick enable step. + + \sa QGLSceneNode, QGLView +*/ + +/*! + Construct a new QGLPickNode object managed by and parented onto + the \a parent scene. The nextPickId() function will be called on + \a parent to assign a pick id to this new node. +*/ +QGLPickNode::QGLPickNode(QGLAbstractScene *parent) : + QObject(parent), m_id(-1), m_target(0) +{ + if (parent) + m_id = parent->nextPickId(); +} + +/*! + \fn int QGLPickNode::id() const + Returns the unique id for this node. This value is assigned by + the parent scene for this node and should be different for every + node in the scene. Returns -1 if the id has not been set yet. + + \sa setId() +*/ + +/*! + \fn void QGLPickNode::setId(int id) + Sets the unique \a id for this node. Generally this function should not + be needed, since the constructor causes a unique id to be obtained + from the parent scene. This function exists mainly for testing + purposes. + + \sa id() +*/ + +/*! + \fn QGLSceneNode *QGLPickNode::target() const + Returns the QGLSceneNode which is the target of this pick node; + null if the target has not been set yet. + + \sa setTarget() +*/ + +/*! + \fn void QGLPickNode::setTarget(QGLSceneNode *target) + Sets the \a target for this pick node. + + \sa target() +*/ + +/*! + \fn void QGLPickNode::pressed() + Signal emitted when the scene object for this node has the mouse pressed + while the cursor is on the object in the scene. +*/ + +/*! + \fn void QGLPickNode::released() + Signal emitted when the scene object for this node has the mouse released + while the cursor is on the object in the scene. +*/ + +/*! + \fn void QGLPickNode::clicked() + Signal emitted when the scene object for this node has the mouse pressed + and then released while the cursor is on the object in the scene. +*/ + +/*! + \fn void QGLPickNode::doubleClicked() + Signal emitted when the scene object for this node has the mouse clicked + twice in succession while the cursor is on the object in the scene. +*/ + +/*! + \fn void QGLPickNode::hoverChanged() + Signal emitted when the scene object for this node has the mouse moved + into or out of this object in the scene. +*/ + +/*! + \internal +*/ +bool QGLPickNode::event(QEvent *e) +{ + // ripped off from teaservice demo, but not before the same code + // was ripped off and put in item3d.cpp - those should probably all + // use this implementation here + if (e->type() == QEvent::MouseButtonPress) + { + QMouseEvent *me = (QMouseEvent *)e; + if (me->button() == Qt::LeftButton) + emit pressed(); + } + else if (e->type() == QEvent::MouseButtonRelease) + { + QMouseEvent *me = (QMouseEvent *)e; + if (me->button() == Qt::LeftButton) + { + emit released(); + if (me->x() >= 0) // Positive: inside object, Negative: outside. + emit clicked(); + } + } + else if (e->type() == QEvent::MouseButtonDblClick) + { + emit doubleClicked(); + } + else if (e->type() == QEvent::Enter) + { + //m_hovering = true; + emit hoverChanged(); + } + else if (e->type() == QEvent::Leave) + { + //m_hovering = false; + emit hoverChanged(); + } + return QObject::event(e); +} |