add QQuickPointerDeviceHandler

Many handlers are interested only in events which come from specific
devices, device types, or mouse buttons.  This provides common
filtering for them.

Change-Id: I30f406ea0c91eb016bc5fb989636787eb680dcbf
Reviewed-by: Jan Arve Sæther <jan-arve.saether@theqtcompany.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/src/quick/handlers/qquickpointerdevicehandler.cpp b/src/quick/handlers/qquickpointerdevicehandler.cpp
new file mode 100644
index 0000000000..03704ac09e
--- /dev/null
+++ b/src/quick/handlers/qquickpointerdevicehandler.cpp
@@ -0,0 +1,109 @@
+/****************************************************************************
+**
+** 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 "qquickpointerdevicehandler_p.h"
+#include <private/qquickitem_p.h>
+#include <QMouseEvent>
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    An intermediate class (not registered as a QML type)
+    for handlers which allow filtering based on device type,
+    pointer type, or device-specific buttons (such as mouse or stylus buttons).
+ */
+QQuickPointerDeviceHandler::QQuickPointerDeviceHandler(QObject *parent)
+    : QQuickPointerHandler(parent)
+    , m_acceptedDevices(QQuickPointerDevice::AllDevices)
+    , m_acceptedPointerTypes(QQuickPointerDevice::AllPointerTypes)
+    , m_acceptedButtons(Qt::AllButtons)
+{
+}
+
+QQuickPointerDeviceHandler::~QQuickPointerDeviceHandler()
+{
+}
+
+void QQuickPointerDeviceHandler::setAcceptedDevices(QQuickPointerDevice::DeviceTypes acceptedDevices)
+{
+    if (m_acceptedDevices == acceptedDevices)
+        return;
+
+    m_acceptedDevices = acceptedDevices;
+    emit acceptedDevicesChanged();
+}
+
+void QQuickPointerDeviceHandler::setAcceptedPointerTypes(QQuickPointerDevice::PointerTypes acceptedPointerTypes)
+{
+    if (m_acceptedPointerTypes == acceptedPointerTypes)
+        return;
+
+    m_acceptedPointerTypes = acceptedPointerTypes;
+    emit acceptedPointerTypesChanged();
+}
+
+void QQuickPointerDeviceHandler::setAcceptedButtons(Qt::MouseButtons buttons)
+{
+    if (m_acceptedButtons == buttons)
+        return;
+
+    m_acceptedButtons = buttons;
+    emit acceptedButtonsChanged();
+}
+
+bool QQuickPointerDeviceHandler::wantsPointerEvent(QQuickPointerEvent *event)
+{
+    if (!QQuickPointerHandler::wantsPointerEvent(event))
+        return false;
+    qCDebug(lcPointerHandlerDispatch) << objectName()
+        << "checking device type" << m_acceptedDevices
+        << "pointer type" << m_acceptedPointerTypes
+        << "buttons" << m_acceptedButtons;
+    if ((event->device()->type() & m_acceptedDevices) == 0)
+        return false;
+    if ((event->device()->pointerType() & m_acceptedPointerTypes) == 0)
+        return false;
+    if (event->device()->pointerType() != QQuickPointerDevice::Finger &&
+            (event->buttons() & m_acceptedButtons) == 0 && (event->button() & m_acceptedButtons) == 0)
+        return false;
+    return true;
+}
+
+QT_END_NAMESPACE