yet another easy task i cant figure out

[sincnarf]

sorry guys for my noobness but i have another problem

Given this custom graphics view... Whenever I press a mouse button a messagebox should appear but it's not. But when I change the QGraphicsSceneMouseEvent into QMouseEvent, the message box appears. And that is weird.

My graphicsView by the way has a pre loaded image (so this means it already has a default graphicsscene)

#include <QtGui>
#include "iadfuqgraphicsview.h"
 
IADFUQGraphicsView::IADFUQGraphicsView(QGraphicsScene *scene, QWidget* parent) :
	QGraphicsView(scene, parent) {
	setAcceptDrops(true);
	setAttribute(Qt::WA_InputMethodEnabled);
	setBackgroundRole(QPalette::Base);
	setDragMode(QGraphicsView::RubberBandDrag);
	setInteractive(true);
	setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
	setBackgroundBrush(QPixmap(":/images/background.png"));
	setAutoFillBackground(true);
#ifdef QT_OPENGL_SUPPORT
	setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#endif
	//	QGraphicsPixmapItem *m_pixmapItem = new QGraphicsPixmapItem(QPixmap::fromImage(QImage(":/images/circle.png")), 0, scene);
 
}
 
IADFUQGraphicsView::IADFUQGraphicsView(QWidget* parent) :
	QGraphicsView(parent) {
	setAcceptDrops(true);
	setAttribute(Qt::WA_InputMethodEnabled);
	setBackgroundRole(QPalette::Base);
	setDragMode(QGraphicsView::RubberBandDrag);
	setInteractive(true);
	setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
	setBackgroundBrush(QPixmap(":/images/background.png"));
	setAutoFillBackground(true);
#ifdef QT_OPENGL_SUPPORT
	setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#endif
}
 
void IADFUQGraphicsView::mousePressEvent(QGraphicsSceneMouseEvent *event) {
 
	QMessageBox::information(this, tr("Problem"), tr("Why isn't this message box showing?"));
 
}

#include <QtGui>
#include "iadfuqgraphicsview.h"

IADFUQGraphicsView::IADFUQGraphicsView(QGraphicsScene *scene, QWidget* parent) :
	QGraphicsView(scene, parent) {
	setAcceptDrops(true);
	setAttribute(Qt::WA_InputMethodEnabled);
	setBackgroundRole(QPalette::Base);
	setDragMode(QGraphicsView::RubberBandDrag);
	setInteractive(true);
	setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
	setBackgroundBrush(QPixmap(":/images/background.png"));
	setAutoFillBackground(true);
#ifdef QT_OPENGL_SUPPORT
	setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#endif
	//	QGraphicsPixmapItem *m_pixmapItem = new QGraphicsPixmapItem(QPixmap::fromImage(QImage(":/images/circle.png")), 0, scene);

}

IADFUQGraphicsView::IADFUQGraphicsView(QWidget* parent) :
	QGraphicsView(parent) {
	setAcceptDrops(true);
	setAttribute(Qt::WA_InputMethodEnabled);
	setBackgroundRole(QPalette::Base);
	setDragMode(QGraphicsView::RubberBandDrag);
	setInteractive(true);
	setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
	setBackgroundBrush(QPixmap(":/images/background.png"));
	setAutoFillBackground(true);
#ifdef QT_OPENGL_SUPPORT
	setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#endif
}

void IADFUQGraphicsView::mousePressEvent(QGraphicsSceneMouseEvent *event) {

	QMessageBox::information(this, tr("Problem"), tr("Why isn't this message box showing?"));
	
}

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[jpn]

It's because QGraphicsView is a QWidget, not QGraphicsItem. Notice the difference between QWidget::mousePressEvent() and QGraphicsItem::mousePressEvent().

[sincnarf]

So i have to create my own graphics items ... I see. Oh well

I originally wantedd to implement drawing ellipses whenever a mouse click is done on a graphics view

[sincnarf]

iadfuqgraphicsitem.cpp - I subclassed QGraphicsPixmapItem

#include <QtGui>
#include "iadfuqgraphicsitem.h"
 
IADFUQGraphicsItem::IADFUQGraphicsItem(QGraphicsItem * parent) :
	QGraphicsPixmapItem(parent) {
	setAcceptDrops (false);
	setAcceptsHoverEvents(true);
	setEnabled(true);
	setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable
			| QGraphicsItem::ItemIgnoresTransformations);
	setVisible(true);
	setZValue(1);
}
 
void IADFUQGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event) {
	QMessageBox::information(0, tr("!!!!!!!"), tr("Y!!!!"));
}
 
void IADFUQGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent * event) {
}
void IADFUQGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent * event) {
}

#include <QtGui>
#include "iadfuqgraphicsitem.h"

IADFUQGraphicsItem::IADFUQGraphicsItem(QGraphicsItem * parent) :
	QGraphicsPixmapItem(parent) {
	setAcceptDrops (false);
	setAcceptsHoverEvents(true);
	setEnabled(true);
	setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable
			| QGraphicsItem::ItemIgnoresTransformations);
	setVisible(true);
	setZValue(1);
}

void IADFUQGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event) {
	QMessageBox::information(0, tr("!!!!!!!"), tr("Y!!!!"));
}

void IADFUQGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent * event) {
}
void IADFUQGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent * event) {
}

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iadfuqgraphicsitem.h

#ifndef IADFUQGRAPHICSITEM_H
#define IADFUQGRAPHICSITEM_H
#include <QGraphicsPixmapItem>
#include <QObject>
class QGraphicsSceneMouseEvent;
class IADFUQGraphicsItem : public QObject, public QGraphicsPixmapItem {
	Q_OBJECT
public:
	IADFUQGraphicsItem(QGraphicsItem* parent = 0);
protected:
	void mousePressEvent ( QGraphicsSceneMouseEvent * event );
	void mouseMoveEvent ( QGraphicsSceneMouseEvent * event );
	void mouseReleaseEvent ( QGraphicsSceneMouseEvent * event );
};
#endif

#ifndef IADFUQGRAPHICSITEM_H
#define IADFUQGRAPHICSITEM_H
#include <QGraphicsPixmapItem>
#include <QObject>
class QGraphicsSceneMouseEvent;
class IADFUQGraphicsItem : public QObject, public QGraphicsPixmapItem {
	Q_OBJECT
public:
	IADFUQGraphicsItem(QGraphicsItem* parent = 0);
protected:
	void mousePressEvent ( QGraphicsSceneMouseEvent * event );
	void mouseMoveEvent ( QGraphicsSceneMouseEvent * event );
	void mouseReleaseEvent ( QGraphicsSceneMouseEvent * event );
};
#endif

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is this the right way to create a new IADFUQGraphicsItem?

IADFUQGraphicsItem *item = qobject_cast<IADFUQGraphicsItem *>(someQGraphicsPixmapItem);

IADFUQGraphicsItem *item = qobject_cast<IADFUQGraphicsItem *>(someQGraphicsPixmapItem);

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[sincnarf]

Okay this is what I did

IADFUQGraphicsItem
			*item = qgraphicsitem_cast<IADFUQGraphicsItem *>(items.first());

IADFUQGraphicsItem
			*item = qgraphicsitem_cast<IADFUQGraphicsItem *>(items.first());

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Now how can I add the custom graphics item to a graphics view? Casting item again to

QGraphicsPixmapItem
			*pixmapItem = qgraphicsitem_cast<QGraphicsPixmapItem *>(item);

QGraphicsPixmapItem
			*pixmapItem = qgraphicsitem_cast<QGraphicsPixmapItem *>(item);

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then using scene->addPixmap(pixmapItem->pixmap()) does not show the message box at all when i click on the item. Do I need to create a method just like addPixmap that accepts my custom graphics item?

[sincnarf]

Okay solved this...

just used addItem()

the item must be set as
item->setSelected(true)

cost me 5 hours