QTextBrowser and ENTER key

[szarek]

I have a TextBrowser in my program. How to do that it will be respond to press ENTER key identical as is implement signal returnPressed() in lineEdit?

[Lykurg]

Subcalss QTextBrowser and reimp the key press event. Check for enter and emit a proper signal. (This will works but I fear that it won't be intuitive for your users.)

[Vit Stepanek]

Or you can use event filter - see
void QObject::installEventFilter ( QObject * filterObj )
at
http://doc.trolltech.com/latest/qobj...allEventFilter

[szarek]

I can not understand how to use installEventFilter, can somebody help me? Also I find class QShortcut and I wrote this:

#include "kczatownik.h"
#include "ui_kczatownik.h"
 
KCzatownik::KCzatownik(QWidget *parent) : QMainWindow(parent) , ui(new Ui::KCzatownik)
{
    ui->setupUi(this);
    skrot = new QShortcut(QKeySequence("Enter"),this);
    connect(skrot,SIGNAL(activated()),this,SLOT(on_textBrowser_textChanged()));
}
 
KCzatownik::~KCzatownik()
{
    delete ui;
}
 
 
void KCzatownik::on_textBrowser_textChanged()
{
    QScrollBar *bar = ui->textBrowser->verticalScrollBar();
    bar->setValue(bar->maximum());
}

#include "kczatownik.h"
#include "ui_kczatownik.h"

KCzatownik::KCzatownik(QWidget *parent) : QMainWindow(parent) , ui(new Ui::KCzatownik)
{
    ui->setupUi(this);
    skrot = new QShortcut(QKeySequence("Enter"),this);
    connect(skrot,SIGNAL(activated()),this,SLOT(on_textBrowser_textChanged()));
}

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


void KCzatownik::on_textBrowser_textChanged()
{
    QScrollBar *bar = ui->textBrowser->verticalScrollBar();
    bar->setValue(bar->maximum());
}

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but also it is not working.

[szarek]

Finally, I made that, using void QObject::installEventFilter ( QObject * filterObj ) but it is another problem. I am using QtCreator 2.0. See that:

#ifndef ENTER_H
#define ENTER_H
#include <QObject>
#include <QEvent>
#include <QKeyEvent>
#include <mainwindow.h>
class enter : public QObject
{
    Q_OBJECT
public:
    enter();
protected:
    bool eventFilter(QObject *obj, QEvent *event);
};
 
#endif // ENTER_H
//###############################################
#include "enter.h"
 
enter::enter()
{
}
 
bool enter::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::KeyPress)
    {
 
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        if(keyEvent->key()==Qt::Key_Return)
        {
            // PLACE 1
        }
    }
    return QObject::eventFilter(obj, event);
}

#ifndef ENTER_H
#define ENTER_H
#include <QObject>
#include <QEvent>
#include <QKeyEvent>
#include <mainwindow.h>
class enter : public QObject
{
    Q_OBJECT
public:
    enter();
protected:
    bool eventFilter(QObject *obj, QEvent *event);
};

#endif // ENTER_H
//###############################################
#include "enter.h"

enter::enter()
{
}

bool enter::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::KeyPress)
    {

        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        if(keyEvent->key()==Qt::Key_Return)
        {
            // PLACE 1
        }
    }
    return QObject::eventFilter(obj, event);
}

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <enter.h>
 
namespace Ui
{
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void licz();
private:
    Ui::MainWindow *ui;
private slots:
    void on_textBrowser_textChanged();
};
 
#endif // MAINWINDOW_H
//###############################################
#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->textBrowser->installEventFilter(new enter());
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::licz() //PLACE 2
{
    ui->label->setText(ui->label->text()+"0");
}
 
void MainWindow::on_textBrowser_textChanged()
{
    licz();
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <enter.h>

namespace Ui
{
    class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void licz();
private:
    Ui::MainWindow *ui;
private slots:
    void on_textBrowser_textChanged();
};

#endif // MAINWINDOW_H
//###############################################
#include "mainwindow.h"
#include "ui_mainwindow.h"

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

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

void MainWindow::licz() //PLACE 2
{
    ui->label->setText(ui->label->text()+"0");
}

void MainWindow::on_textBrowser_textChanged()
{
    licz();
}

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How to in PLACE 1 call method licz() from PLACE 2 ? I think it should be some slot,signal or emit but I do not have idea how to do it. Can someone help?

[wysota]

Move the event filter from the "enter" object to the "MainWindow" object if all the former does is to intercept the event. Then you can call the method directly.