File indexing completed on 2024-04-14 04:36:49

 /*
  * SPDX-FileCopyrightText: (C) 2020 Carl Schwan <carl@carlschwan.eu>
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #include "resizerectangle.h"
 
 #include <QDebug>
 #include <QSGFlatColorMaterial>
 #include <QSGGeometry>
 #include <QSGGeometryNode>
 
 ResizeRectangle::ResizeRectangle(QQuickItem *parent)
     : QQuickItem(parent)
 {
     setAcceptedMouseButtons(Qt::LeftButton);
     setFlag(ItemHasContents);
 }
 
 void ResizeRectangle::componentComplete()
 {
     QQuickItem::componentComplete();
     QQmlEngine *engine = qmlEngine(this);
     m_handleComponent = new QQmlComponent(engine, QUrl(QStringLiteral("qrc:/BasicResizeHandle.qml")));
 
     auto handleItem = qobject_cast<QQuickItem *>(m_handleComponent->create());
     qDebug() << handleItem;
     m_handleBottomLeft = qobject_cast<ResizeHandle *>(handleItem);
     m_handleBottomLeft->setParent(this);
     m_handleBottomLeft->setParentItem(this);
     m_handleBottomLeft->setResizeCorner(ResizeHandle::BottomLeft);
     m_handleBottomLeft->setX(m_insideX - 5);
     m_handleBottomLeft->setY(m_insideY + m_insideHeight - 5);
     m_handleBottomLeft->setRectangle(this);
 
     handleItem = qobject_cast<QQuickItem *>(m_handleComponent->create());
     m_handleBottomRight = qobject_cast<ResizeHandle *>(handleItem);
     m_handleBottomRight->setParent(this);
     m_handleBottomRight->setParentItem(this);
     m_handleBottomRight->setResizeCorner(ResizeHandle::BottomRight);
     m_handleBottomRight->setX(m_insideX + m_insideWidth - 5);
     m_handleBottomRight->setY(m_insideY + m_insideHeight - 5);
     m_handleBottomRight->setRectangle(this);
 
     handleItem = qobject_cast<QQuickItem *>(m_handleComponent->create());
     m_handleTopLeft = qobject_cast<ResizeHandle *>(handleItem);
     m_handleTopLeft->setParent(this);
     m_handleTopLeft->setParentItem(this);
     m_handleTopLeft->setResizeCorner(ResizeHandle::TopLeft);
     m_handleTopLeft->setX(m_insideX - 5);
     m_handleTopLeft->setY(m_insideY - 5);
     m_handleTopLeft->setRectangle(this);
 
     handleItem = qobject_cast<QQuickItem *>(m_handleComponent->create());
     m_handleTopRight = qobject_cast<ResizeHandle *>(handleItem);
     m_handleTopRight->setParent(this);
     m_handleTopRight->setParentItem(this);
     m_handleTopRight->setResizeCorner(ResizeHandle::TopRight);
     m_handleTopRight->setX(m_insideX + m_insideWidth - 5);
     m_handleTopRight->setY(m_insideY - 5);
     m_handleTopRight->setRectangle(this);
 }
 
 void ResizeRectangle::updateHandles()
 {
     if (isComponentComplete()) {
         m_handleTopRight->setX(m_insideX + m_insideWidth - 5);
         m_handleTopRight->setY(m_insideY - 5);
         m_handleTopLeft->setX(m_insideX - 5);
         m_handleTopLeft->setY(m_insideY - 5);
         m_handleBottomRight->setX(m_insideX + m_insideWidth - 5);
         m_handleBottomRight->setY(m_insideY + m_insideHeight - 5);
         m_handleBottomLeft->setX(m_insideX - 5);
         m_handleBottomLeft->setY(m_insideY + m_insideHeight - 5);
     }
 }
 
 qreal ResizeRectangle::insideX() const
 {
     return m_insideX;
 }
 
 void ResizeRectangle::setInsideX(qreal x)
 {
     x = qBound(0.0, x, this->width() - m_insideWidth);
     if (m_insideX == x) {
         return;
     }
     m_insideX = x;
     updateHandles();
     Q_EMIT insideXChanged();
     update();
 }
 
 qreal ResizeRectangle::insideY() const
 {
     return m_insideY;
 }
 
 void ResizeRectangle::setInsideY(qreal y)
 {
     y = qBound(0.0, y, this->height() - m_insideHeight);
     if (m_insideY == y) {
         return;
     }
     m_insideY = y;
     updateHandles();
     Q_EMIT insideYChanged();
     update();
 }
 
 qreal ResizeRectangle::insideWidth() const
 {
     return m_insideWidth;
 }
 
 void ResizeRectangle::setInsideWidth(qreal width)
 {
     width = qMin(width, this->width());
     if (m_insideWidth == width) {
         return;
     }
     m_insideWidth = width;
     updateHandles();
     Q_EMIT insideWidthChanged();
     update();
 }
 
 qreal ResizeRectangle::insideHeight() const
 {
     return m_insideHeight;
 }
 
 void ResizeRectangle::setInsideHeight(qreal height)
 {
     height = qMin(height, this->height());
     if (m_insideHeight == height) {
         return;
     }
     m_insideHeight = height;
     updateHandles();
     Q_EMIT insideHeightChanged();
     update();
 }
 
 QSGNode *ResizeRectangle::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
 {
     QSGGeometryNode *node = nullptr;
     QSGGeometry *geometry = nullptr;
 
     const int vertexCount = 12;
     const int indexCount = 8 * 3;
     if (!oldNode) {
         node = new QSGGeometryNode;
         geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), vertexCount, indexCount);
         geometry->setIndexDataPattern(QSGGeometry::StaticPattern);
         geometry->setDrawingMode(QSGGeometry::DrawTriangles);
         node->setGeometry(geometry);
         node->setFlag(QSGNode::OwnsGeometry);
 
         QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
         material->setColor(QColor(0, 0, 0, 70));
         node->setMaterial(material);
         node->setFlag(QSGNode::OwnsMaterial);
     } else {
         node = static_cast<QSGGeometryNode *>(oldNode);
         geometry = node->geometry();
         geometry->allocate(vertexCount, indexCount);
     }
 
     QSGGeometry::Point2D *points = geometry->vertexDataAsPoint2D();
     points[0].set(0, 0);
     points[1].set(0, height());
     points[2].set(m_insideX, 0);
     points[3].set(m_insideX, height());
 
     points[4].set(m_insideX + m_insideWidth, 0);
     points[5].set(m_insideX + m_insideWidth, height());
     points[6].set(width(), 0);
     points[7].set(width(), height());
 
     points[8].set(m_insideX, m_insideY);
     points[9].set(m_insideX + m_insideWidth, m_insideY);
     points[10].set(m_insideX + m_insideWidth, m_insideY + m_insideHeight);
     points[11].set(m_insideX, m_insideY + m_insideHeight);
 
     quint16 *indices = geometry->indexDataAsUShort();
     // left
     indices[0 + 0] = 0;
     indices[0 + 1] = 1;
     indices[0 + 2] = 2;
 
     indices[3 + 0] = 3;
     indices[3 + 1] = 1;
     indices[3 + 2] = 2;
 
     // right
     indices[6 + 0] = 4;
     indices[6 + 1] = 5;
     indices[6 + 2] = 6;
 
     indices[9 + 0] = 7;
     indices[9 + 1] = 5;
     indices[9 + 2] = 6;
 
     // top
     indices[12 + 0] = 2;
     indices[12 + 1] = 8;
     indices[12 + 2] = 4;
 
     indices[15 + 0] = 9;
     indices[15 + 1] = 8;
     indices[15 + 2] = 4;
 
     // bottom
     indices[18 + 0] = 3;
     indices[18 + 1] = 11;
     indices[18 + 2] = 10;
 
     indices[21 + 0] = 3;
     indices[21 + 1] = 5;
     indices[21 + 2] = 10;
 
     geometry->markIndexDataDirty();
     geometry->markVertexDataDirty();
     node->markDirty(QSGNode::DirtyGeometry | QSGNode::DirtyMaterial);
     return node;
 }
 
 void ResizeRectangle::mouseReleaseEvent(QMouseEvent *event)
 {
     m_mouseClickedOnRectangle = false;
     event->accept();
 }
 
 void ResizeRectangle::mousePressEvent(QMouseEvent *event)
 {
     m_mouseDownPosition = event->pos();
     m_mouseDownGeometry = QPointF(m_insideX, m_insideY);
     if (m_mouseDownPosition.x() >= m_insideX && m_mouseDownPosition.x() <= m_insideX + m_insideWidth && m_mouseDownPosition.y() >= m_insideY
         && m_mouseDownPosition.y() <= m_insideY + m_insideHeight) {
         m_mouseClickedOnRectangle = true;
     }
     event->accept();
 }
 
 void ResizeRectangle::mouseMoveEvent(QMouseEvent *event)
 {
     if (m_mouseClickedOnRectangle) {
         const QPointF difference = m_mouseDownPosition - event->pos();
         const qreal x = m_mouseDownGeometry.x() - difference.x();
         const qreal y = m_mouseDownGeometry.y() - difference.y();
         setInsideX(x);
         setInsideY(y);
     }
 }
 
 void ResizeRectangle::mouseDoubleClickEvent(QMouseEvent *event)
 {
     Q_EMIT acceptSize();
     event->accept();
 }
 
 #include "moc_resizerectangle.cpp"