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https://github.com/crystalidea/qt6windows7.git
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115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "diagramitem.h"
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#include "arrow.h"
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#include <QGraphicsScene>
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#include <QGraphicsSceneContextMenuEvent>
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#include <QMenu>
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#include <QPainter>
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//! [0]
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DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
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QGraphicsItem *parent)
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: QGraphicsPolygonItem(parent), myDiagramType(diagramType)
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, myContextMenu(contextMenu)
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{
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QPainterPath path;
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switch (myDiagramType) {
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case StartEnd:
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path.moveTo(200, 50);
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path.arcTo(150, 0, 50, 50, 0, 90);
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path.arcTo(50, 0, 50, 50, 90, 90);
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path.arcTo(50, 50, 50, 50, 180, 90);
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path.arcTo(150, 50, 50, 50, 270, 90);
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path.lineTo(200, 25);
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myPolygon = path.toFillPolygon();
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break;
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case Conditional:
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myPolygon << QPointF(-100, 0) << QPointF(0, 100)
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<< QPointF(100, 0) << QPointF(0, -100)
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<< QPointF(-100, 0);
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break;
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case Step:
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myPolygon << QPointF(-100, -100) << QPointF(100, -100)
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<< QPointF(100, 100) << QPointF(-100, 100)
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<< QPointF(-100, -100);
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break;
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default:
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myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
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<< QPointF(120, 80) << QPointF(70, -80)
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<< QPointF(-120, -80);
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break;
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}
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setPolygon(myPolygon);
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setFlag(QGraphicsItem::ItemIsMovable, true);
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setFlag(QGraphicsItem::ItemIsSelectable, true);
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setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
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}
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//! [0]
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//! [1]
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void DiagramItem::removeArrow(Arrow *arrow)
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{
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arrows.removeAll(arrow);
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}
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//! [1]
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//! [2]
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void DiagramItem::removeArrows()
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{
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// need a copy here since removeArrow() will
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// modify the arrows container
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const auto arrowsCopy = arrows;
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for (Arrow *arrow : arrowsCopy) {
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arrow->startItem()->removeArrow(arrow);
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arrow->endItem()->removeArrow(arrow);
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scene()->removeItem(arrow);
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delete arrow;
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}
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}
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//! [2]
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//! [3]
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void DiagramItem::addArrow(Arrow *arrow)
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{
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arrows.append(arrow);
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}
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//! [3]
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//! [4]
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QPixmap DiagramItem::image() const
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{
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QPixmap pixmap(250, 250);
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pixmap.fill(Qt::transparent);
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QPainter painter(&pixmap);
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painter.setPen(QPen(Qt::black, 8));
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painter.translate(125, 125);
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painter.drawPolyline(myPolygon);
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return pixmap;
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}
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//! [4]
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//! [5]
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void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
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{
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scene()->clearSelection();
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setSelected(true);
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myContextMenu->popup(event->screenPos());
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}
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//! [5]
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//! [6]
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QVariant DiagramItem::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (change == QGraphicsItem::ItemPositionChange) {
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for (Arrow *arrow : std::as_const(arrows))
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arrow->updatePosition();
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}
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return value;
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}
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//! [6]
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