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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "rotationmanipulator.h"
#include "formeditoritem.h"
#include "formeditorscene.h"
#include "qmlanchors.h"
#include <QDebug>
#include <QtMath>
#include "enumeration.h"
#include "mathutils.h"
#include <limits>
namespace QmlDesigner {
RotationManipulator::RotationManipulator(LayerItem *layerItem, FormEditorView *view)
: m_view(view)
, m_beginTopMargin(0.0)
, m_beginLeftMargin(0.0)
, m_beginRightMargin(0.0)
, m_beginBottomMargin(0.0)
, m_layerItem(layerItem)
{
}
RotationManipulator::~RotationManipulator()
{
deleteSnapLines();
}
void RotationManipulator::setHandle(RotationHandleItem *rotationHandle)
{
Q_ASSERT(rotationHandle);
m_rotationHandle = rotationHandle;
m_rotationController = rotationHandle->rotationController();
Q_ASSERT(m_rotationController.isValid());
}
void RotationManipulator::removeHandle()
{
m_rotationController = RotationController();
m_rotationHandle = nullptr;
}
void RotationManipulator::begin(const QPointF &/*beginPoint*/)
{
if (m_rotationController.isValid()) {
m_isActive = true;
m_beginBoundingRect = m_rotationController.formEditorItem()->qmlItemNode().instanceBoundingRect();
m_beginFromContentItemToSceneTransform = m_rotationController.formEditorItem()->instanceSceneContentItemTransform();
m_beginFromSceneToContentItemTransform = m_beginFromContentItemToSceneTransform.inverted();
m_beginFromItemToSceneTransform = m_rotationController.formEditorItem()->instanceSceneTransform();
m_beginToParentTransform = m_rotationController.formEditorItem()->qmlItemNode().instanceTransform();
m_rewriterTransaction = m_view->beginRewriterTransaction(QByteArrayLiteral("RotationManipulator::begin"));
m_rewriterTransaction.ignoreSemanticChecks();
m_beginBottomRightPoint = m_beginToParentTransform.map(m_rotationController.formEditorItem()->qmlItemNode().instanceBoundingRect().bottomRight());
QmlAnchors anchors(m_rotationController.formEditorItem()->qmlItemNode().anchors());
m_beginTopMargin = anchors.instanceMargin(AnchorLineTop);
m_beginLeftMargin = anchors.instanceMargin(AnchorLineLeft);
m_beginRightMargin = anchors.instanceMargin(AnchorLineRight);
m_beginBottomMargin = anchors.instanceMargin(AnchorLineBottom);
m_beginRotation = m_rotationController.formEditorItem()->qmlItemNode().rotation();
deleteSnapLines();
}
}
void RotationManipulator::update(const QPointF& updatePoint, Qt::KeyboardModifiers keyMods)
{
if (m_rotationController.isValid()) {
FormEditorItem *formEditorItem = m_rotationController.formEditorItem();
const bool degreeStep5 = keyMods.testFlag(Qt::ShiftModifier);
const bool degreeStep45 = keyMods.testFlag(Qt::AltModifier);
QPointF updatePointInLocalSpace = m_beginFromSceneToContentItemTransform.map(updatePoint);
QRectF boundingRect(m_beginBoundingRect);
QPointF transformOrigin;
QVariant transformOriginVar = formEditorItem->qmlItemNode().transformOrigin();
if (transformOriginVar.isValid()) {
QmlDesigner::Enumeration a = transformOriginVar.value<QmlDesigner::Enumeration>();
const QString originStr = a.nameToString();
if (originStr == "TopLeft") {
transformOrigin = boundingRect.topLeft();
}
else if (originStr == "Top") {
transformOrigin.setX(boundingRect.center().x());
transformOrigin.setY(boundingRect.top());
}
else if (originStr == "TopRight") {
transformOrigin = boundingRect.topRight();
}
else if (originStr == "Right") {
transformOrigin.setX(boundingRect.right());
transformOrigin.setY(boundingRect.center().y());
}
else if (originStr == "BottomRight") {
transformOrigin = boundingRect.bottomRight();
}
else if (originStr == "Bottom") {
transformOrigin.setX(boundingRect.center().x());
transformOrigin.setY(boundingRect.bottom());
}
else if (originStr == "BottomLeft") {
transformOrigin = boundingRect.bottomLeft();
}
else if (originStr == "Left") {
transformOrigin.setX(boundingRect.left());
transformOrigin.setY(boundingRect.center().y());
}
else {
//center and anything else
transformOrigin = boundingRect.center();
}
}
else {
transformOrigin = boundingRect.center();
}
auto angleCalc = [](const QPointF &origin, const QPointF &position){
const qreal deltaX = origin.x() - position.x();
const qreal deltaY = origin.y() - position.y();
return qRadiansToDegrees(qAtan2(deltaY, deltaX));
};
auto snapCalc = [](const qreal angle, const qreal snap){
return qRound(angle/snap)*snap;
};
auto resultCalc = [&](qreal cursorAngle, qreal handleAngle) {
qreal result = 0.0;
const qreal rotateBy = cursorAngle - handleAngle;
if (degreeStep45)
result = snapCalc(rotateBy, 45.0);
else if (degreeStep5)
result = snapCalc(rotateBy, 5.0);
else
result = rotateBy;
while (result > 360.)
result -= 360.;
while (result < -360.)
result += 360.;
return result;
};
const qreal cursorAngle = angleCalc(transformOrigin, updatePointInLocalSpace);
const QPointF topLeftHandle = boundingRect.topLeft();
const QPointF topRightHandle = boundingRect.topRight();
const QPointF bottomRightHandle = boundingRect.bottomRight();
const QPointF bottomLeftHandle = boundingRect.bottomLeft();
if (m_rotationHandle->isTopLeftHandle()) {
//we need to change origin coords, otherwise item will rotate unpredictably:
if (transformOrigin == topLeftHandle)
transformOrigin = boundingRect.center();
const qreal handleAngle = angleCalc(transformOrigin, topLeftHandle);
formEditorItem->qmlItemNode().setRotation(resultCalc(cursorAngle + m_beginRotation, handleAngle));
}
else if (m_rotationHandle->isTopRightHandle()) {
if (transformOrigin == topRightHandle)
transformOrigin = boundingRect.center();
const qreal handleAngle = angleCalc(transformOrigin, topRightHandle);
formEditorItem->qmlItemNode().setRotation(resultCalc(cursorAngle + m_beginRotation, handleAngle));
}
else if (m_rotationHandle->isBottomRightHandle()) {
if (transformOrigin == bottomRightHandle)
transformOrigin = boundingRect.center();
const qreal handleAngle = angleCalc(transformOrigin, bottomRightHandle);
formEditorItem->qmlItemNode().setRotation(resultCalc(cursorAngle + m_beginRotation, handleAngle));
}
else if (m_rotationHandle->isBottomLeftHandle()) {
if (transformOrigin == bottomLeftHandle)
transformOrigin = boundingRect.center();
const qreal handleAngle = angleCalc(transformOrigin, bottomLeftHandle);
formEditorItem->qmlItemNode().setRotation(resultCalc(cursorAngle + m_beginRotation, handleAngle));
}
}
}
void RotationManipulator::end()
{
m_isActive = false;
m_rewriterTransaction.commit();
clear();
removeHandle();
}
void RotationManipulator::deleteSnapLines()
{
if (m_layerItem) {
for (QGraphicsItem *item : qAsConst(m_graphicsLineList)) {
m_layerItem->scene()->removeItem(item);
delete item;
}
}
m_graphicsLineList.clear();
m_view->scene()->update();
}
RotationHandleItem *RotationManipulator::rotationHandle()
{
return m_rotationHandle;
}
void RotationManipulator::clear()
{
m_rewriterTransaction.commit();
deleteSnapLines();
m_beginBoundingRect = QRectF();
m_beginFromSceneToContentItemTransform = QTransform();
m_beginFromContentItemToSceneTransform = QTransform();
m_beginFromItemToSceneTransform = QTransform();
m_beginToParentTransform = QTransform();
m_beginTopMargin = 0.0;
m_beginLeftMargin = 0.0;
m_beginRightMargin = 0.0;
m_beginBottomMargin = 0.0;
removeHandle();
}
bool RotationManipulator::isActive() const
{
return m_isActive;
}
}
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