The Qt Resource System

http://doc.qt.io/qt-5/resources.html

The resource system is based on tight cooperation between qmake, rcc (Qt's resource compiler), and QFile.

아이콘 , 전송파일, 기타 등을 설정한다. .qrc 파일

컴파일 옵션주는법

RESOURCES     = application.qrc

main.cpp

다음과 같이 정의되어 있다.

QT_BEGIN_NAMESPACE

class QGraphicsPolygonItem;

class QGraphicsLineItem;

class QGraphicsScene;

class QRectF;

class QGraphicsSceneMouseEvent;

class QPainterPath;

QT_END_NAMESPACE

QT_BEGIN_NAMESPACE

QT_END_NAMESPACE

들어가보면

# define QT_BEGIN_NAMESPACE namespace QT_NAMESPACE {
# define QT_END_NAMESPACE }


 Q_OBJECT 란?
Q_OBJECT 메크로 역할 http://cafe.naver.com/qtprograming/36

qobjectdefs.h
/* qmake ignore Q_OBJECT */
#define Q_OBJECT \
 public: \
     Q_OBJECT_CHECK \
     static const QMetaObject staticMetaObject; \
     virtual const QMetaObject *metaObject() const; \
     virtual void *qt_metacast(const char *); \
     QT_TR_FUNCTIONS \
     virtual int qt_metacall(QMetaObject::Call, int, void **); \
 private: \
     Q_DECL_HIDDEN_STATIC_METACALL static void qt_static_metacall(QObject *, QMetaObject::Call, int, void **); \
struct QPrivateSignal {}; 





diagramitem.h
#ifndef DIAGRAMITEM_H
#define DIAGRAMITEM_H

#include <QGraphicsPixmapItem>
#include <QList>

QT_BEGIN_NAMESPACE
class QPixmap;
class QGraphicsItem;
class QGraphicsScene;
class QTextEdit;
class QGraphicsSceneMouseEvent;
class QMenu;
class QGraphicsSceneContextMenuEvent;
class QPainter;
class QStyleOptionGraphicsItem;
class QWidget;
class QPolygonF;
QT_END_NAMESPACE

class Arrow;

//! [0]
class DiagramItem : public QGraphicsPolygonItem
{
public:
    enum { Type = UserType + 15 };
    enum DiagramType { Step, Conditional, StartEnd, Io };

    DiagramItem(DiagramType diagramType, QMenu *contextMenu, QGraphicsItem *parent = 0);

    void removeArrow(Arrow *arrow);
    void removeArrows();
    DiagramType diagramType() const { return myDiagramType; }
    QPolygonF polygon() const { return myPolygon; }
    void addArrow(Arrow *arrow);
    QPixmap image() const;
    int type() const Q_DECL_OVERRIDE { return Type;}

protected:
    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) Q_DECL_OVERRIDE;
    QVariant itemChange(GraphicsItemChange change, const QVariant &value) Q_DECL_OVERRIDE;

private:
    DiagramType myDiagramType;
    QPolygonF myPolygon;
    QMenu *myContextMenu;
    QList<Arrow *> arrows;
};
//! [0]

#endif // DIAGRAMITEM_H







diagramitem.cpp
#include "diagramitem.h"
#include "arrow.h"

#include <QGraphicsScene>
#include <QGraphicsSceneContextMenuEvent>
#include <QMenu>
#include <QPainter>

//! [0]
DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
             QGraphicsItem *parent)
    : QGraphicsPolygonItem(parent)
{
    myDiagramType = diagramType;
    myContextMenu = contextMenu;

    QPainterPath path;
    switch (myDiagramType) {
        case StartEnd:
            path.moveTo(200, 50);
            path.arcTo(150, 0, 50, 50, 0, 90);
            path.arcTo(50, 0, 50, 50, 90, 90);
            path.arcTo(50, 50, 50, 50, 180, 90);
            path.arcTo(150, 50, 50, 50, 270, 90);
            path.lineTo(200, 25);
            myPolygon = path.toFillPolygon();
            break;
        case Conditional:
            myPolygon << QPointF(-100, 0) << QPointF(0, 100)
                      << QPointF(100, 0) << QPointF(0, -100)
                      << QPointF(-100, 0);
            break;
        case Step:
            myPolygon << QPointF(-100, -100) << QPointF(100, -100)
                      << QPointF(100, 100) << QPointF(-100, 100)
                      << QPointF(-100, -100);
            break;
        default:
            myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
                      << QPointF(120, 80) << QPointF(70, -80)
                      << QPointF(-120, -80);
            break;
    }
    setPolygon(myPolygon);
    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
}
//! [0]

//! [1]
void DiagramItem::removeArrow(Arrow *arrow)
{
    int index = arrows.indexOf(arrow);

    if (index != -1)
        arrows.removeAt(index);
}
//! [1]

//! [2]
void DiagramItem::removeArrows()
{
    foreach (Arrow *arrow, arrows) {
        arrow->startItem()->removeArrow(arrow);
        arrow->endItem()->removeArrow(arrow);
        scene()->removeItem(arrow);
        delete arrow;
    }
}
//! [2]

//! [3]
void DiagramItem::addArrow(Arrow *arrow)
{
    arrows.append(arrow);
}
//! [3]

//! [4]
QPixmap DiagramItem::image() const
{
    QPixmap pixmap(250, 250);
    pixmap.fill(Qt::transparent);
    QPainter painter(&pixmap);
    painter.setPen(QPen(Qt::black, 8));
    painter.translate(125, 125);
    painter.drawPolyline(myPolygon);

    return pixmap;
}
//! [4]

//! [5]
void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    scene()->clearSelection();
    setSelected(true);
    myContextMenu->exec(event->screenPos());
}
//! [5]

//! [6]
QVariant DiagramItem::itemChange(GraphicsItemChange change, const QVariant &value)
{
    if (change == QGraphicsItem::ItemPositionChange) {
        foreach (Arrow *arrow, arrows) {
            arrow->updatePosition();
        }
    }

    return value;
}
//! [6]

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