QGraphicsSceneMousePressEvent inconsistent dll linkage

khalistan

my MainWindow header file looks like this;
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include "QtGui"
#include "QMouseEvent"
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_actionOpen_triggered();

void on_pushButtonZoomOut_clicked();

void on_pushButtonZoomIn_clicked();

void on_pushButtonNewLine_clicked();

void on_pushButtonLastLine_clicked();

// void taskCompleted();
void on_pushButtonRotate_clicked();

void on_pushButtonRotateA_clicked();

private:
Ui::MainWindow *ui;
QGraphicsItem *item;
QGraphicsScene *scene;
QGraphicsEllipseItem *ellipse;
};

#endif // MAINWINDOW_H
..............
/Now mainwindow.cpp file like this:-/
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtCore>
#include <QtGui>
#include "QFileDialog"
#include <QDebug>

QString im;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_actionOpen_triggered() //Open Button, to open File Dailog
{
QFileDialog dialog(this);
dialog.setNameFilter(tr("Images(*.png *.xpm *.jpg *.JPG .JPEG"));
dialog.setViewMode(QFileDialog::Detail);
QString filName = QFileDialog::getOpenFileName(this,tr("Open Images"), "./", tr("Image Files(.jpg *.png *.JPEG *.JPG"));
if(!filName.isEmpty()){
QImage image(filName);
item = new QGraphicsPixmapItem(QPixmap::fromImage(image));
scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);
scene->addItem(item);
im = "open";
}

}

void MainWindow::on_pushButtonZoomOut_clicked()
{
ui->graphicsView->scale(.5,.5);
}

void MainWindow::on_pushButtonZoomIn_clicked()
{
ui->graphicsView->scale(2,2);
}

void MainWindow::on_pushButtonNewLine_clicked()
{
if(im =="open"){
QBrush redBrush(Qt::red);
QBrush blueBrush(Qt::blue);
QPen blackpen(Qt::black);
blackpen.setWidth(6);
ellipse = scene->addEllipse(10,10,100,100,blackpen,redBrush);
ellipse->setFlag(QGraphicsItem::ItemIsMovable);
}
}

void MainWindow::on_pushButtonLastLine_clicked()
{

}
void QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *event){
int x = event->scenePos().x();
qDebug()<<x;
}
void MainWindow::on_pushButtonRotate_clicked()
{
ui->graphicsView->rotate(-10);
}

void MainWindow::on_pushButtonRotateA_clicked()
{
ui->graphicsView->rotate(+10);
}
..........................................................
Now i am getting error E:\test\untitled\customview.cpp:19: warning: C4273: 'QGraphicsScene::mousePressEvent' : inconsistent dll linkage

If i am using in header file
void QGraphicsSceneMouseEvent(QGraphicsSceneMouseEvent *ev);
then I try it in cpp file as
MainWindow::QGraphicsSceneMouseEvent(QGraphicsSceneMouseEvent *ev){
qDebug()<<ev->scenePos().x();
}
Then it shows nothing..
I want to know distance on two points from image. Those two point i will show on image.For that I need to know mouse position only on Image(which is displayed on graphics)
Thanks for help. Please help me out

SGaist

Hi and welcome to devnet,

void QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *event)

belongs to QGraphicsScene, you can't reimplement it like that. You have to do it in a subclass of QGraphicsScene.

For the second question, you have another thread already there