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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qquicktransformgroup_p.h"
#include <QtQuick/private/qquickitem_p.h>
QT_BEGIN_NAMESPACE
/*!
\qmltype TransformGroup
\inqmlmodule QtQuick.VectorImage.Helpers
\brief Provides specialization for sequences of transforms.
This type allows specific specializations for sequences of transform operations required
for VectorImage.
*/
namespace {
class DummyQuickItem : public QQuickItem
{
public:
DummyQuickItem(QQuickTransformGroup *group) : m_group(group) {}
virtual void itemChange(ItemChange ic, const ItemChangeData &) override
{
if (ic == ItemTransformHasChanged)
m_group->triggerUpdate();
}
private:
QQuickTransformGroup *m_group = nullptr;
};
}
QQuickTransformGroup::QQuickTransformGroup(QObject *parent)
: QQuickTransform(parent)
{
m_dummyItem = new DummyQuickItem(this);
}
QQuickTransformGroup::~QQuickTransformGroup()
{
delete m_dummyItem;
}
void QQuickTransformGroup::activateOverride(QQuickTransform *xform)
{
m_transformFlags[xform] |= Override;
update();
}
void QQuickTransformGroup::triggerUpdate()
{
update();
}
void QQuickTransformGroup::deactivateOverride(QQuickTransform *xform)
{
m_transformFlags[xform] &= ~Override;
update();
}
void QQuickTransformGroup::deactivate(QQuickTransform *xform)
{
m_transformFlags[xform] |= Disabled;
update();
}
void QQuickTransformGroup::applyTo(QMatrix4x4 *matrix) const
{
QVarLengthArray<QQuickTransform *, 8> activeTransforms;
for (QQuickTransform *xform : m_transforms) {
int flags = m_transformFlags.value(xform);
if (!(flags & Disabled)) {
activeTransforms.append(xform);
if (flags & Override)
break;
}
}
// Apply in reverse order
for (auto it = activeTransforms.crbegin(); it != activeTransforms.crend(); ++it)
(*it)->applyTo(matrix);
}
QQmlListProperty<QQuickTransform> QQuickTransformGroup::transformSequence()
{
return QQmlListProperty<QQuickTransform>(this,
nullptr,
transformSequence_append,
transformSequence_count,
transformSequence_at,
transformSequence_clear);
}
void QQuickTransformGroup::transformSequence_append(QQmlListProperty<QQuickTransform> *prop,
QQuickTransform *transform)
{
if (!transform)
return;
QQuickTransformGroup *that = static_cast<QQuickTransformGroup *>(prop->object);
that->m_transforms.append(transform);
that->update();
transform->appendToItem(that->m_dummyItem);
}
QQuickTransform *QQuickTransformGroup::transformSequence_at(QQmlListProperty<QQuickTransform> *prop,
qsizetype idx)
{
QQuickTransformGroup *that = static_cast<QQuickTransformGroup *>(prop->object);
if (idx < 0 || idx >= that->m_transforms.size())
return nullptr;
else
return that->m_transforms.at(idx);
}
void QQuickTransformGroup::transformSequence_clear(QQmlListProperty<QQuickTransform> *prop)
{
QQuickTransformGroup *that = static_cast<QQuickTransformGroup *>(prop->object);
that->m_transforms.clear();
that->update();
}
qsizetype QQuickTransformGroup::transformSequence_count(QQmlListProperty<QQuickTransform> *prop)
{
QQuickTransformGroup *that = static_cast<QQuickTransformGroup *>(prop->object);
return that->m_transforms.size();
}
QT_END_NAMESPACE