mouseMoveEvent: KDE moving widget

[NullPointer]

Hi,

I'm learning to use QRubberBand, so I created a app with a QMainWindow and now I'm reimplementing the three mouse events to make possible to "select" a space using the rubber band...
Everything runs great, except that I have to "double click" or use a modifier to allow the mouseMoveEvent get caught correctly. I'm under KDE 4.5.5, and it have that thing of moving the windows when you drag a widget from anywhere...
I have tried the grabMouse, WA_NoMousePropagation, WA_NoMouseReplay, event->ignore() and event->accept, but nothing solved this issue...

My code is:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QRubberBand>
#include <QMouseEvent>
#include <QDebug>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    selection=new QRubberBand(QRubberBand::Rectangle, this);
    setAttribute(Qt::WA_NoMousePropagation, true);
    setAttribute(Qt::WA_NoMouseReplay, true);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
 
void MainWindow::mousePressEvent(QMouseEvent * event){
    //grabMouse();
    releaseMouse();
    selection->move(event->pos());
    selection->resize(1,1);
    selection->show();
    event->ignore();
}
 
void MainWindow::mouseMoveEvent(QMouseEvent * event){
    qDebug()<<event->pos();
    selection->resize(event->x()- selection->x(), event->y()- selection->y());
}
 
void MainWindow::mouseReleaseEvent(QMouseEvent * event){
    selection->hide();
    //releaseMouse();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QRubberBand>
#include <QMouseEvent>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    selection=new QRubberBand(QRubberBand::Rectangle, this);
    setAttribute(Qt::WA_NoMousePropagation, true);
    setAttribute(Qt::WA_NoMouseReplay, true);
}

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


void MainWindow::mousePressEvent(QMouseEvent * event){
    //grabMouse();
    releaseMouse();
    selection->move(event->pos());
    selection->resize(1,1);
    selection->show();
    event->ignore();
}

void MainWindow::mouseMoveEvent(QMouseEvent * event){
    qDebug()<<event->pos();
    selection->resize(event->x()- selection->x(), event->y()- selection->y());
}

void MainWindow::mouseReleaseEvent(QMouseEvent * event){
    selection->hide();
    //releaseMouse();
}

To copy to clipboard, switch view to plain text mode 

With the debug, I noticed that not always the event is called, just when I double click or use modifiers (ctrl, alt or shift) ...

How can I solve this?

[high_flyer]

Try this, and see if it helps:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    selection=new QRubberBand(QRubberBand::Rectangle, this);
    //setAttribute(Qt::WA_NoMousePropagation, true); //you are on a  top level widget!
    //setAttribute(Qt::WA_NoMouseReplay, true); //what is this for here?
}
 
void MainWindow::mousePressEvent(QMouseEvent * event){
    MainWindow::mousePressEvent(event); //if you want the normal behavior to stay
    selection->move(event->pos());
    selection->resize(1,1);
    selection->show();
    event->accept(); //why ignore? you are using the event! at any rate, since in this case you have no parents for the main windows, it doesn't really matter.
}
 
void MainWindow::mouseMoveEvent(QMouseEvent * event){
    MainWindow::mouseMoveEvent(event);
    qDebug()<<event->pos();
    selection->resize(event->x()- selection->x(), event->y()- selection->y());
}
 
void MainWindow::mouseReleaseEvent(QMouseEvent * event){
    MainWindow::mouseReleaseEvent(event);
    selection->hide();
    event->accept();
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    selection=new QRubberBand(QRubberBand::Rectangle, this);
    //setAttribute(Qt::WA_NoMousePropagation, true); //you are on a  top level widget!
    //setAttribute(Qt::WA_NoMouseReplay, true); //what is this for here?
}

void MainWindow::mousePressEvent(QMouseEvent * event){
    MainWindow::mousePressEvent(event); //if you want the normal behavior to stay
    selection->move(event->pos());
    selection->resize(1,1);
    selection->show();
    event->accept(); //why ignore? you are using the event! at any rate, since in this case you have no parents for the main windows, it doesn't really matter.
}

void MainWindow::mouseMoveEvent(QMouseEvent * event){
    MainWindow::mouseMoveEvent(event);
    qDebug()<<event->pos();
    selection->resize(event->x()- selection->x(), event->y()- selection->y());
}

void MainWindow::mouseReleaseEvent(QMouseEvent * event){
    MainWindow::mouseReleaseEvent(event);
    selection->hide();
    event->accept();
}

To copy to clipboard, switch view to plain text mode