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inputwatcher.cpp
/*
* Copyright (C) 2015 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "inputwatcher.h"
#include <QMouseEvent>
InputWatcher::InputWatcher(QObject *parent)
: QObject(parent)
, m_mousePressed(false)
, m_touchPressed(false)
{
}
QObject *InputWatcher::target() const
{
return m_target;
}
void InputWatcher::setTarget(QObject *value)
{
if (m_target == value) {
return;
}
if (m_target) {
m_target->removeEventFilter(this);
}
setMousePressed(false);
setTouchPressed(false);
m_target = value;
if (m_target) {
m_target->installEventFilter(this);
}
Q_EMIT targetChanged(value);
}
bool InputWatcher::targetPressed() const
{
return m_mousePressed || m_touchPressed;
}
bool InputWatcher::eventFilter(QObject* /*watched*/, QEvent *event)
{
switch (event->type()) {
case QEvent::TouchBegin:
setTouchPressed(true);
break;
case QEvent::TouchEnd:
setTouchPressed(false);
break;
case QEvent::MouseButtonPress:
{
QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
if (mouseEvent->button() == Qt::LeftButton) {
setMousePressed(true);
}
}
break;
case QEvent::MouseButtonRelease:
{
QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
if (mouseEvent->button() == Qt::LeftButton) {
setMousePressed(false);
}
}
break;
default:
// Not interested
break;
}
// We never filter them out. We are just watching.
return false;
}
void InputWatcher::setMousePressed(bool value)
{
if (value == m_mousePressed) {
return;
}
bool oldPressed = targetPressed();
m_mousePressed = value;
if (targetPressed() != oldPressed) {
Q_EMIT targetPressedChanged(targetPressed());
}
}
void InputWatcher::setTouchPressed(bool value)
{
if (value == m_touchPressed) {
return;
}
bool oldPressed = targetPressed();
m_touchPressed = value;
if (targetPressed() != oldPressed) {
Q_EMIT targetPressedChanged(targetPressed());
}
}