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/****************************************************************************
**
** Copyright (C) 2016 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickpointerhandler_p.h"
QT_BEGIN_NAMESPACE
Q_LOGGING_CATEGORY(lcPointerHandlerDispatch, "qt.quick.handler.dispatch")
/*!
\qmltype PointerHandler
\instantiates QQuickPointerHandler
\inqmlmodule QtQuick
\ingroup qtquick-handlers
\brief Handler for pointer events
PointerHandler is a handler for pointer events regardless of source.
They may represent events from a touch, mouse or tablet device.
*/
QQuickPointerHandler::QQuickPointerHandler(QObject *parent)
: QObject(parent)
, m_currentEvent(nullptr)
, m_target(nullptr)
, m_enabled(true)
, m_active(false)
, m_targetExplicitlySet(false)
{
}
QQuickPointerHandler::~QQuickPointerHandler()
{
QQuickItem *parItem = parentItem();
if (parItem) {
QQuickItemPrivate *p = QQuickItemPrivate::get(parItem);
p->extra.value().pointerHandlers.removeOne(this);
}
}
void QQuickPointerHandler::setGrab(QQuickEventPoint *point, bool grab)
{
QQuickPointerHandler *oldGrabber = point->grabberPointerHandler();
if (grab && oldGrabber != this) {
if (oldGrabber)
oldGrabber->handleGrabCancel(point);
point->setGrabberPointerHandler(this);
onGrabChanged(point);
emit grabChanged(point);
} else if (!grab && oldGrabber == this) {
point->setGrabberPointerHandler(nullptr);
onGrabChanged(point);
emit grabChanged(point);
}
}
QPointF QQuickPointerHandler::eventPos(const QQuickEventPoint *point) const
{
return (target() ? target()->mapFromScene(point->scenePos()) : point->scenePos());
}
bool QQuickPointerHandler::parentContains(const QQuickEventPoint *point) const
{
if (point) {
if (QQuickItem *par = parentItem())
return par->contains(par->mapFromScene(point->scenePos()));
}
return false;
}
/*!
\qmlproperty QQuickPointerHandler::enabled
If a PointerHandler is disabled, it will reject all events
and no signals will be emitted.
TODO is it too extreme not even to emit pressed/updated/released?
or should we disable only the higher-level interpretation, in subclasses?
*/
void QQuickPointerHandler::setEnabled(bool enabled)
{
if (m_enabled == enabled)
return;
m_enabled = enabled;
emit enabledChanged();
}
void QQuickPointerHandler::setTarget(QQuickItem *target)
{
m_targetExplicitlySet = true;
if (m_target == target)
return;
m_target = target;
emit targetChanged();
}
QQuickItem *QQuickPointerHandler::target() const
{
if (!m_targetExplicitlySet)
return parentItem();
return m_target;
}
void QQuickPointerHandler::handlePointerEvent(QQuickPointerEvent *event)
{
if (wantsPointerEvent(event))
handlePointerEventImpl(event);
else
setActive(false);
}
void QQuickPointerHandler::handleGrabCancel(QQuickEventPoint *point)
{
qCDebug(lcPointerHandlerDispatch) << point;
Q_ASSERT(point);
setActive(false);
point->setAccepted(false);
emit canceled(point);
}
bool QQuickPointerHandler::wantsPointerEvent(QQuickPointerEvent *event)
{
Q_UNUSED(event)
return m_enabled;
}
void QQuickPointerHandler::setActive(bool active)
{
if (m_active != active) {
m_active = active;
onActiveChanged();
emit activeChanged();
}
}
void QQuickPointerHandler::handlePointerEventImpl(QQuickPointerEvent *event)
{
m_currentEvent = event;
}
/*!
\qmlproperty QQuickPointerHandler::parent
The \l Item which is the scope of the handler; the Item in which it was declared.
The handler will handle events on behalf of this Item, which means a
pointer event is relevant if at least one of its event points occurs within
the Item's interior. Initially \l target() is the same, but target()
can be reassigned.
\sa QQuickPointerHandler::target(), QObject::parent()
*/
QT_END_NAMESPACE
|
