QGraphicsScene doesn't respond to mousePressEvent

[Affenbrotbaum]

Hey there,

I've been looking around and at the example but just can't figure out why my code won't accept the mousePressEvent. It would be great if someone could please have a look at it.

MainWindow.cpp

#include <QGraphicsTextItem>
#include <QGraphicsSceneMouseEvent>
 
#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setupCalendar();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}
 
void MainWindow::setupCalendar(){
    ui->CalendarView->setScene(&calendarScene);
    ui->CalendarView->move(0,0);
    ui->CalendarView->show();
 
    initializeCalendarVariables();
    drawGrid();
}
 
void MainWindow::initializeCalendarVariables(){
    columns = 3;
 
    interval = 15;  // Minutes
    boxHeight = 19;
    dayStart = 9;
    dayEnd = 17;
 
    totalDayLength = dayEnd - dayStart;
    horizontalLines = totalDayLength * (60 / interval) + 2; // 1 for the Heading and one for OB1
    leftMargin = 35;
    topMargin = 20;
    columnWidth = 200;
    totalWidth = columnWidth *columns; //left to right
    totalHeight = boxHeight * horizontalLines; // total height
}
 
void MainWindow::drawGrid(){
 
    QPen gridLinePen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
 
    //Horizontal Lines
    for(int ii=0; ii <= horizontalLines; ii++){
        calendarScene.addLine(leftMargin,ii*boxHeight,leftMargin+totalWidth,ii*boxHeight,gridLinePen);
    }
 
    //Vertical Lines
    for(int jj=0; jj <= columns; jj ++){
        calendarScene.addLine(jj * columnWidth + leftMargin,0,jj*columnWidth + leftMargin,totalHeight,gridLinePen);
     }
}
 
void MainWindow::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    QApplication::setOverrideCursor(QCursor(Qt::WaitCursor)); //Just for testing
}

#include <QGraphicsTextItem>
#include <QGraphicsSceneMouseEvent>

#include "mainwindow.h"
#include "ui_mainwindow.h"

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

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

void MainWindow::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

void MainWindow::setupCalendar(){
    ui->CalendarView->setScene(&calendarScene);
    ui->CalendarView->move(0,0);
    ui->CalendarView->show();

    initializeCalendarVariables();
    drawGrid();
}

void MainWindow::initializeCalendarVariables(){
    columns = 3;

    interval = 15;  // Minutes
    boxHeight = 19;
    dayStart = 9;
    dayEnd = 17;

    totalDayLength = dayEnd - dayStart;
    horizontalLines = totalDayLength * (60 / interval) + 2; // 1 for the Heading and one for OB1
    leftMargin = 35;
    topMargin = 20;
    columnWidth = 200;
    totalWidth = columnWidth *columns; //left to right
    totalHeight = boxHeight * horizontalLines; // total height
}

void MainWindow::drawGrid(){

    QPen gridLinePen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);

    //Horizontal Lines
    for(int ii=0; ii <= horizontalLines; ii++){
        calendarScene.addLine(leftMargin,ii*boxHeight,leftMargin+totalWidth,ii*boxHeight,gridLinePen);
    }

    //Vertical Lines
    for(int jj=0; jj <= columns; jj ++){
        calendarScene.addLine(jj * columnWidth + leftMargin,0,jj*columnWidth + leftMargin,totalHeight,gridLinePen);
     }
}

void MainWindow::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    QApplication::setOverrideCursor(QCursor(Qt::WaitCursor)); //Just for testing
}

To copy to clipboard, switch view to plain text mode 

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
protected:
    void changeEvent(QEvent *e);
    void mousePressEvent(QGraphicsSceneMouseEvent *);
 
private:
    void initializeCalendarVariables();
    void setupCalendar();
 
    Ui::MainWindow *ui;
    QGraphicsScene calendarScene;
 
    //Calendar
    void drawGrid();
    int columns;
 
    int interval;
    int boxHeight;
    int horizontalLines;
    int leftMargin;
    int topMargin;
    int columnWidth;
    int totalWidth; //left to right
    int totalHeight; // total height
    int dayStart;
    int dayEnd;
    int totalDayLength;
 
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>

namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

protected:
    void changeEvent(QEvent *e);
    void mousePressEvent(QGraphicsSceneMouseEvent *);

private:
    void initializeCalendarVariables();
    void setupCalendar();

    Ui::MainWindow *ui;
    QGraphicsScene calendarScene;

    //Calendar
    void drawGrid();
    int columns;

    int interval;
    int boxHeight;
    int horizontalLines;
    int leftMargin;
    int topMargin;
    int columnWidth;
    int totalWidth; //left to right
    int totalHeight; // total height
    int dayStart;
    int dayEnd;
    int totalDayLength;

};

#endif // MAINWINDOW_H

To copy to clipboard, switch view to plain text mode 

Any ideas? I'm stomped. Thanks a lot already.
Alex

[Affenbrotbaum]

I just found a solution.
http://www.qtcentre.org/threads/2243...nt-not-working

Thanks