qt 键盘驱动分析

http://www.cuteqt.com/blog/?p=322

qkbdlinuxinput.cpp

QWSKeyboardHandler::KeycodeAction ka;
ka = m_handler->processKeycode(code, value != 0, value == 2);

qkbd_qws.cpp

// simple builtin US keymap

//包含了默认的s_keymap_default和s_keycompose_default
#include "qkbd_defaultmap_qws_p.h"

// the unloadKeymap() function needs to be AFTER the defaultmap include,
// since the sizeof(s_keymap_default) wouldn't work otherwise.

void QWSKbPrivate::unloadKeymap()
{
    if (m_keymap && m_keymap != s_keymap_default)
        delete [] m_keymap;
    if (m_keycompose && m_keycompose != s_keycompose_default)
        delete [] m_keycompose;

    m_keymap = s_keymap_default;
    m_keymap_size = sizeof(s_keymap_default) / sizeof(s_keymap_default[0]);
    m_keycompose = s_keycompose_default;
    m_keycompose_size = sizeof(s_keycompose_default) / sizeof(s_keycompose_default[0]);

    // reset state, so we could switch keymaps at runtime
    m_modifiers = 0;
    memset(m_locks, 0, sizeof(m_locks));
    m_composing = 0;
    m_dead_unicode = 0xffff;
}

Maps keycode according to a keymap and sends that key event to the Qt for Embedded Linux server application.

QWSKeyboardHandler::KeycodeAction QWSKeyboardHandler::processKeycode(quint16 keycode, bool pressed, bool autorepeat)

{

……

    // send the result to the QWS server
    processKeyEvent(unicode, qtcode & ~modmask, Qt::KeyboardModifiers(qtcode & modmask), pressed, autorepeat);

}

Note that this function does not handle key mapping. Please use processKeycode() if you need that functionality.

void QWSKeyboardHandler::processKeyEvent(int unicode, int keycode, Qt::KeyboardModifiers modifiers,
                        bool isPress, bool autoRepeat)
{
    qwsServer->processKeyEvent(unicode, keycode, modifiers, isPress, autoRepeat);
}