How to use QKeyEvents in Qt

Comments

19 Sep
2009

Article Review by nayan_trivedi (20090919)

This class describes key event.This is basic article of Qt.It shows the use of QKeyEvents class.code snippet shown describes that whatever key you are select from key board written in red color is done function as written in that event by the widget.

Using this Key event any can make functionality of Widget simple.This article is very useful for doing different functions using key board.event sent to widget when you press the key from key board.

This article is very useful for beginner as well as intermediate.

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Article Metadata

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Tested with

Devices(s): S60 Emulator

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Compatibility

Platform(s): Qt 4.5

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Article

Keywords: QKeyEvents

Created: mind_freak (26 Jul 2009)

Last edited: hamishwillee (11 Oct 2012)

Overview

This example shows how you can send key events to the widget with keyboard input focus when keys are pressed or released. A key event contains a special accept flag that indicates whether the receiver will handle the key event.

Classes used in this code: QKeyEvents-Describes a key event.

Event Code

void my_app::clicked0 () //For tab Event
{
    QKeyEvent key(QKeyEvent::KeyPress, Qt::Key_Tab, Qt::NoModifier, "Tab", false, 0 );
    QApplication::sendEvent(this, &key);
}
 
void my_app::clicked1 () //For tab shift
{
    QKeyEvent key(QKeyEvent::KeyPress, Qt::Key_Tab, Qt::ShiftModifier, "Tab-Shift", false, 0 );
    QApplication::sendEvent(this, &key);
}
 
void my_app::clicked2 () //For space
{
    QKeyEvent key(QKeyEvent::KeyPress, Qt::Key_Return, Qt::NoModifier, "Return", false, 0 );
    QApplication::sendEvent(this, &key);
}
 
void my_app::clicked3 () //For enter Event
{
    QKeyEvent key(QKeyEvent::KeyPress, Qt::Key_Space, Qt::NoModifier, "Space", false, 0 );
    QApplication::sendEvent(this, &key);
}