Diagram Scene Example▲
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#ifndef DIAGRAMSCENE_H
#define DIAGRAMSCENE_H
#include
"diagramitem.h"
#include
"diagramtextitem.h"
#include <QGraphicsScene>
class
QGraphicsSceneMouseEvent;
class
QMenu;
class
QPointF;
class
QGraphicsLineItem;
class
QFont;
class
QGraphicsTextItem;
class
QColor;
class
DiagramScene : public
QGraphicsScene
{
Q_OBJECT
public
:
enum
Mode {
InsertItem, InsertLine, InsertText, MoveItem }
;
explicit
DiagramScene(QMenu *
itemMenu, QObject *
parent =
0
);
QFont font() const
{
return
myFont; }
QColor textColor() const
{
return
myTextColor; }
QColor itemColor() const
{
return
myItemColor; }
QColor lineColor() const
{
return
myLineColor; }
void
setLineColor(const
QColor &
amp;color);
void
setTextColor(const
QColor &
amp;color);
void
setItemColor(const
QColor &
amp;color);
void
setFont(const
QFont &
amp;font);
public
slots:
void
setMode(Mode mode);
void
setItemType(DiagramItem::
DiagramType type);
void
editorLostFocus(DiagramTextItem *
item);
signals
:
void
itemInserted(DiagramItem *
item);
void
textInserted(QGraphicsTextItem *
item);
void
itemSelected(QGraphicsItem *
item);
protected
:
void
mousePressEvent(QGraphicsSceneMouseEvent *
mouseEvent) override
;
void
mouseMoveEvent(QGraphicsSceneMouseEvent *
mouseEvent) override
;
void
mouseReleaseEvent(QGraphicsSceneMouseEvent *
mouseEvent) override
;
private
:
bool
isItemChange(int
type);
DiagramItem::
DiagramType myItemType;
QMenu *
myItemMenu;
Mode myMode;
bool
leftButtonDown;
QPointF startPoint;
QGraphicsLineItem *
line;
QFont myFont;
DiagramTextItem *
textItem;
QColor myTextColor;
QColor myItemColor;
QColor myLineColor;
}
;
#endif
// DIAGRAMSCENE_H