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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "MouseHelper.h"
#include "MainFrm.h"
#include "StudioApp.h"
#include <QtWidgets/qapplication.h>
#include <QtWidgets/qmainwindow.h>
#include <QtWidgets/qwidget.h>
#include <QtGui/qcursor.h>
#include <QtGui/qwindow.h>
#include <QtGui/qscreen.h>
#include <QtCore/qtimer.h>
#include <QtGui/qevent.h>
#include <QtGui/qbitmap.h>
static void setBlankCursor()
{
// Qt::BlankCursor gets corrupted in some situations, so use custom bitmap (QTBUG-61678)
static QBitmap *zeroBitmap = nullptr;
if (!zeroBitmap) {
zeroBitmap = new QBitmap(32, 32);
zeroBitmap->clear();
}
QGuiApplication::setOverrideCursor(QCursor(*zeroBitmap, *zeroBitmap));
}
MouseHelper::MouseHelper(QObject *parent)
: QObject(parent)
, m_dragState(StateNotDragging)
, m_maxDelta(50, 50)
{
// All cursor position modifications are done asynchronously, so we don't get position
// changes in middle of mouse event handling.
m_cursorResetTimer.setInterval(0);
m_cursorResetTimer.setSingleShot(true);
connect(&m_cursorResetTimer, &QTimer::timeout, this, &MouseHelper::resetCursor);
}
void MouseHelper::startUnboundedDrag()
{
m_dragState = StateDragging;
setBlankCursor();
m_startPos = QCursor::pos();
QWindow *window = g_StudioApp.m_pMainWnd->windowHandle();
if (window)
window->installEventFilter(this); // Always install event filter to main window
if (m_widget) {
// Use the center of the on-screen portion of the parent widget as reference point.
// This ensures cursor restores properly, as the cursor stays on the widget.
m_window = m_widget->window()->windowHandle();
const QRect screenGeometry = m_window->screen()->geometry();
const QPoint bottomRight = screenGeometry.bottomRight();
QSize widgetSize = m_widget->size();
QPoint widgetPos = m_widget->mapToGlobal(QPoint(0, 0));
if (widgetPos.x() < 0) {
widgetSize.setWidth(widgetSize.width() + widgetPos.x());
widgetPos.setX(0);
}
if (widgetPos.y() < 0) {
widgetSize.setHeight(widgetSize.height() + widgetPos.y());
widgetPos.setY(0);
}
if (widgetPos.x() + widgetSize.width() > bottomRight.x())
widgetSize.setWidth(bottomRight.x() - widgetPos.x());
if (widgetPos.y() + widgetSize.height() > bottomRight.y())
widgetSize.setHeight(bottomRight.y() - widgetPos.y());
m_maxDelta = QPoint(widgetSize.width() / 2, widgetSize.height() / 2);
m_referencePoint = widgetPos + m_maxDelta;
} else {
// Just assume the screen of the app is at least 400x400 if we don't have widget
m_referencePoint = QPoint(200, 200);
m_window = nullptr;
}
m_previousPoint = m_startPos;
m_cursorResetTimer.start();
}
void MouseHelper::endUnboundedDrag()
{
QWindow *window = g_StudioApp.m_pMainWnd->windowHandle();
if (window)
window->removeEventFilter(this);
m_dragState = StateEndingDrag;
m_cursorResetTimer.start();
}
QPoint MouseHelper::delta()
{
QPoint delta(0, 0);
if (m_dragState == StateDragging) {
QPoint currentPoint = QCursor::pos();
// In macOS we come here after QCursor::setPos has been called from resetCursor(), but
// before the actual position has changed. This results in hude delta values, which makes
// mouse drag adjustment on macOS unusable (QT3DS-3763).
// This also breaks the cursor position resetting on macOS, but that's due to a bug in
// Qt (QTBUG-33959)
if (m_previousPoint != m_referencePoint) {
delta = currentPoint - m_previousPoint;
// Limit delta to even out the maximum possible change rate regardless of widget position
if (delta.x() > m_maxDelta.x())
delta.setX(m_maxDelta.x());
else if (delta.x() < -m_maxDelta.x())
delta.setX(-m_maxDelta.x());
if (delta.y() > m_maxDelta.y())
delta.setY(m_maxDelta.y());
else if (delta.y() < -m_maxDelta.y())
delta.setY(-m_maxDelta.y());
if (!m_cursorResetTimer.isActive())
m_cursorResetTimer.start();
}
m_previousPoint = currentPoint;
}
return delta;
}
void MouseHelper::setWidget(QWidget *widget)
{
m_widget = widget;
}
void MouseHelper::resetCursor()
{
switch (m_dragState) {
case StateDragging:
if (m_window)
QCursor::setPos(m_window->screen(), m_referencePoint);
else
QCursor::setPos(m_referencePoint);
m_previousPoint = m_referencePoint;
break;
case StateEndingDrag:
if (m_window)
QCursor::setPos(m_window->screen(), m_startPos);
else
QCursor::setPos(m_startPos);
m_dragState = StateFinalCursorReset;
m_cursorResetTimer.start();
break;
case StateFinalCursorReset:
// First change to default cursor to avoid any flicker of cursor
qApp->changeOverrideCursor(Qt::ArrowCursor);
qApp->restoreOverrideCursor();
m_dragState = StateNotDragging;
break;
case StateNotDragging:
break;
}
}
bool MouseHelper::eventFilter(QObject *obj, QEvent *event)
{
Q_UNUSED(obj)
// Eat all mouse button events that are not for left button and all key events
switch (event->type()) {
case QEvent::MouseButtonDblClick:
case QEvent::MouseButtonPress:
case QEvent::MouseButtonRelease: {
QMouseEvent *me = static_cast<QMouseEvent *>(event);
if (me->button() == Qt::LeftButton)
return false;
else
return true;
}
case QEvent::KeyPress:
case QEvent::KeyRelease:
case QEvent::ShortcutOverride:
return true;
default:
break;
}
return false;
}
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