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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Design Tooling
**
** 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.
**
****************************************************************************/
#include "handleitem.h"
#include "curvesegment.h"
#include "graphicsscene.h"
#include "keyframeitem.h"
#include "utils.h"
#include <QPainter>
namespace DesignTools {
struct HandleGeometry
{
HandleGeometry(const QPointF &pos, const HandleItemStyleOption &style)
{
QPointF topLeft(-style.size / 2.0, -style.size / 2.0);
handle = QRectF(topLeft, -topLeft);
toKeyframe = QLineF(QPointF(0.0, 0.0), -pos);
angle = -toKeyframe.angle() + 45.0;
bbox = handle.united(QRectF(-pos, QSizeF(1.0,1.0)));
}
QRectF bbox;
QRectF handle;
QLineF toKeyframe;
double angle;
};
HandleItem::HandleItem(QGraphicsItem *parent, HandleItem::Slot slot)
: SelectableItem(parent)
, m_slot(slot)
, m_style()
{
setFlag(QGraphicsItem::ItemStacksBehindParent, true);
}
HandleItem::~HandleItem() {}
int HandleItem::type() const
{
return Type;
}
bool HandleItem::keyframeSelected() const
{
if (auto *frame = keyframe())
return frame->selected();
return false;
}
CurveSegment HandleItem::segment() const
{
if (KeyframeItem *parent = qgraphicsitem_cast<KeyframeItem *>(parentItem()))
return parent->segment(m_slot);
return CurveSegment();
}
KeyframeItem *HandleItem::keyframe() const
{
if (KeyframeItem *parent = qgraphicsitem_cast<KeyframeItem *>(parentItem()))
return parent;
return nullptr;
}
HandleItem::Slot HandleItem::slot() const
{
return m_slot;
}
QRectF HandleItem::boundingRect() const
{
HandleGeometry geom(pos(), m_style);
return geom.bbox;
}
bool HandleItem::contains(const QPointF &point) const
{
if (KeyframeItem *parent = keyframe()) {
HandleGeometry geom(pos(), m_style);
geom.handle.moveCenter(parent->pos() + pos());
return geom.handle.contains(point);
}
return false;
}
void HandleItem::underMouseCallback()
{
if (auto *gscene = qobject_cast<GraphicsScene *>(scene()))
gscene->handleUnderMouse(this);
}
void HandleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
if (locked())
return;
Q_UNUSED(option)
Q_UNUSED(widget)
QColor handleColor(selected() ? m_style.selectionColor : m_style.color);
if (activated())
handleColor = m_style.activeColor;
if (isUnderMouse())
handleColor = m_style.hoverColor;
HandleGeometry geom(pos(), m_style);
QPen pen = painter->pen();
pen.setWidthF(m_style.lineWidth);
pen.setColor(handleColor);
painter->save();
painter->setPen(pen);
painter->drawLine(geom.toKeyframe);
painter->rotate(geom.angle);
painter->fillRect(geom.handle, handleColor);
painter->restore();
}
void HandleItem::setStyle(const CurveEditorStyle &style)
{
m_style = style.handleStyle;
}
QVariant HandleItem::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value)
{
if (change == ItemPositionChange) {
if (!scene())
return QGraphicsItem::itemChange(change, value);
if (KeyframeItem *keyItem = keyframe()) {
CurveSegment seg = segment();
if (!seg.isLegal())
return value;
QPointF pos = value.toPointF();
QPointF relativePosition = keyItem->transform().inverted().map(pos);
if (m_slot == HandleItem::Slot::Left) {
if (pos.x() > 0.0)
pos.rx() = 0.0;
Keyframe key = seg.right();
key.setLeftHandle(key.position() + relativePosition);
seg.setRight(key);
} else if (m_slot == HandleItem::Slot::Right) {
if (pos.x() < 0.0)
pos.rx() = 0.0;
Keyframe key = seg.left();
key.setRightHandle(key.position() + relativePosition);
seg.setLeft(key);
}
if (seg.isLegal())
m_validPos = pos;
return QVariant(m_validPos);
}
}
return QGraphicsItem::itemChange(change, value);
}
} // End namespace DesignTools.
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