102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
//
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// Copyright (C) 2017 James Turner zakalawe@mac.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include "canvasitem.h"
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#include <QMatrix4x4>
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#include <QSGClipNode>
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class LocalTransform : public QQuickTransform
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{
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Q_OBJECT
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public:
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LocalTransform(QObject *parent) : QQuickTransform(parent) {}
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void setTransform(const QMatrix4x4 &t) {
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transform = t;
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update();
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}
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void applyTo(QMatrix4x4 *matrix) const override
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{
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*matrix *= transform;
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}
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private:
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QMatrix4x4 transform;
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};
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CanvasItem::CanvasItem(QQuickItem* pr)
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: QQuickItem(pr)
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, m_localTransform(new LocalTransform(this))
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{
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setFlag(ItemHasContents);
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m_localTransform->prependToItem(this);
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}
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void CanvasItem::setTransform(const QMatrix4x4 &mat)
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{
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m_localTransform->setTransform(mat);
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}
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void CanvasItem::setGlobalClip(const QRectF &clip)
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{
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m_hasClip = true;
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m_globalClipRect = clip;
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update();
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}
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void CanvasItem::clearClip()
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{
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m_hasClip = false;
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update();
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}
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QSGNode *CanvasItem::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
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{
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if (m_hasClip && oldNode && (oldNode->type() == QSGNode::BasicNodeType)) {
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delete oldNode;
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}
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if (!m_hasClip && m_clipNode) {
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oldNode = new QSGNode;
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}
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updateClipNode();
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return m_hasClip ? m_clipNode : oldNode;
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}
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QSGClipNode *CanvasItem::updateClipNode()
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{
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if (!m_hasClip) {
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if (m_clipNode) {
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delete m_clipNode;
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m_clipNode = nullptr;
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}
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return nullptr;
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}
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if (!m_clipNode) {
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m_clipNode = new QSGClipNode();
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}
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// transform global rect to local
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QRectF localRect(mapFromGlobal(m_globalClipRect.topLeft()),
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mapFromGlobal(m_globalClipRect.bottomRight()));
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m_clipNode->setClipRect(localRect);
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return m_clipNode;
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}
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#include "canvasitem.moc"
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