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/****************************************************************************
**
** Copyright (C) 2018 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 "Qt3DSCommonPrecompile.h"
#include "scenecamerascrollarea.h"
#include "scenecameraglwidget.h"
#include "Core.h"
#include <QtWidgets/qscrollbar.h>
#include <QtGui/qevent.h>
SceneCameraScrollArea::SceneCameraScrollArea(QWidget *parent)
: QAbstractScrollArea(parent)
{
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
m_glWidget = new SceneCameraGlWidget(this);
}
SceneCameraScrollArea::~SceneCameraScrollArea()
{
}
void SceneCameraScrollArea::setZoom(qreal zoom, const QPoint &zoomPoint)
{
// Calculate the actual presentation point
qreal oldH = (horizontalScrollBar()->value() + zoomPoint.x()) / m_zoom;
qreal oldV = (verticalScrollBar()->value() + zoomPoint.y()) / m_zoom;
m_zoom = zoom;
recalculateScrollRanges();
// Move the scrollbars so that the actual presentation point stays in the same location
horizontalScrollBar()->setValue(qRound(oldH * m_zoom - zoomPoint.x()));
verticalScrollBar()->setValue(qRound(oldV * m_zoom - zoomPoint.y()));
recalculateOffsets();
Q_EMIT needUpdate();
}
void SceneCameraScrollArea::setPresentationSize(const QSize &size)
{
if (m_presentationSize != size) {
m_presentationSize = size;
recalculateScrollRanges();
recalculateOffsets();
}
}
void SceneCameraScrollArea::recalculateScrollRanges()
{
const QSizeF presSize = zoomedPresentationSize();
const QSize viewSize = viewport()->size();
horizontalScrollBar()->setRange(0, int(presSize.width() - viewSize.width()));
verticalScrollBar()->setRange(0, int(presSize.height() - viewSize.height()));
horizontalScrollBar()->setPageStep(viewSize.width());
verticalScrollBar()->setPageStep(viewSize.height());
}
void SceneCameraScrollArea::recalculateOffsets()
{
// Texture offset vector contains normalized rect of the viewable area of the texture
const QSize viewSize = viewport()->size();
const qreal fullWidth = qreal(horizontalScrollBar()->maximum() + viewSize.width());
const qreal fullHeight = qreal(verticalScrollBar()->maximum() + viewSize.height());
QVector4D textureOffset(
float(horizontalScrollBar()->value() / fullWidth),
float((verticalScrollBar()->maximum() - verticalScrollBar()->value()) / fullHeight),
float(viewSize.width() / fullWidth), float(viewSize.height() / fullHeight));
m_glWidget->setTextureOffset(textureOffset);
// The geometry offset is adjusted to keep aspect ratio when view area is larger than
// zoomed width/height. Since the geometry of the quad is in range [-1, 1], the width/height of
// the offset is just a direct multiplier to the coordinate.
// XY contain the subpixel offset to ensure we don't get artifacts depending on pixel alignment.
const QSizeF presSize = zoomedPresentationSize();
float subPixelX = 0.0f;
float subPixelY = 0.0f;
qreal normWidth = 1.0;
qreal normHeight = 1.0;
if (presSize.width() < fullWidth) {
qreal diffX = (fullWidth - qRound(presSize.width())) / 2.0;
subPixelX = float((diffX - qRound(diffX)) / fullWidth);
normWidth = presSize.width() / fullWidth;
}
if (presSize.height() < fullHeight) {
qreal diffY = (fullHeight - qRound(presSize.height())) / 2.0;
subPixelY = float((diffY - qRound(diffY)) / fullHeight);
normHeight = presSize.height() / fullHeight;
}
QVector4D geometryOffset(subPixelX, subPixelY, float(normWidth), float(normHeight));
m_glWidget->setGeometryOffset(geometryOffset);
}
void SceneCameraScrollArea::scrollContentsBy(int, int)
{
recalculateOffsets();
Q_EMIT needUpdate();
}
void SceneCameraScrollArea::showEvent(QShowEvent *event)
{
QAbstractScrollArea::showEvent(event);
recalculateScrollRanges();
recalculateOffsets();
resizeGlWidget();
}
void SceneCameraScrollArea::resizeGlWidget()
{
m_glWidget->resize(viewport()->size());
}
QSizeF SceneCameraScrollArea::zoomedPresentationSize()
{
// Multiply QSize components separately to avoid rounding to integers
QSizeF size = QSizeF(m_presentationSize.width() * m_zoom,
m_presentationSize.height() * m_zoom);
return size;
}
void SceneCameraScrollArea::resizeEvent(QResizeEvent *event)
{
QAbstractScrollArea::resizeEvent(event);
recalculateScrollRanges();
recalculateOffsets();
resizeGlWidget();
}
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