void QWidget::grabMouse ()
Grabs the mouse input.

This widget receives all mouse events until releaseMouse() is called; other widgets get no mouse events at all. Keyboard events are not affected. Use grabKeyboard() if you want to grab that.

Warning: Bugs in mouse-grabbing applications very often lock the terminal. Use this function with extreme caution, and consider using the -nograb command line option while debugging.

It is almost never necessary to grab the mouse when using Qt, as Qt grabs and releases it sensibly. In particular, Qt grabs the mouse when a mouse button is pressed and keeps it until the last button is released.

Note: Only visible widgets can grab mouse input. If isVisible() returns false for a widget, that widget cannot call grabMouse().

Note: (Mac OS X developers) For Cocoa, calling grabMouse() on a widget only works when the mouse is inside the frame of that widget. For Carbon, it works outside the widget's frame as well, like for Windows and X11.

See also releaseMouse(), grabKeyboard(), and releaseKeyboard().

который будет проверять, не отпустили ли пробел. Если отпустили - релизим мышь, останавливаем таймер

igor_bogomolov, а что именно должно быть не просто ? Ну а так - на Qt не делал ещё подобное.

#include <QtDebug>
void CMy::keyPressEvent(QKeyEvent *e)
{
    qDebug()<<"press";     
}

void CMy::keyReleaseEvent(QKeyEvent *e)
{
    if(!e->isAutoRepeat())
    {
        qDebug()<<"release";     
    }
    else
    {
        qDebug()<<"repeating release";     
    }
}

press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
repeating release
press
release

События нажатия кнопки мыши будет повторяться пока ты не отпустишь кнопку