Commit 2df9f571 authored by Volker Rümelin's avatar Volker Rümelin Committed by Gerd Hoffmann
Browse files

ui/win32-kbd-hook: handle AltGr in a hook procedure 



Import win32 keyboard hooking code from project spice-gtk. This
patch removes the extra left control key up/down input events
inserted by Windows for the right alt key up/down input events
with international keyboard layouts. Additionally there's some
code to grab the keyboard.

The next patches will use this code.

Only Windows needs this.

Signed-off-by: default avatarVolker Rümelin <vr_qemu@t-online.de>
Message-id: 20200516072014.7766-1-vr_qemu@t-online.de
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent debe78ce

include/ui/win32-kbd-hook.h

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/*

 * SPDX-License-Identifier: GPL-2.0-or-later

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 */



#ifndef UI_WIN32_KBD_HOOK_H

#define UI_WIN32_KBD_HOOK_H



void win32_kbd_set_window(void *hwnd);

void win32_kbd_set_grab(bool grab);



#endif

stubs/Makefile.objs

+1 −0
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@@ -32,6 +32,7 @@ stub-obj-y += trace-control.o 
stub-obj-y += uuid.o

stub-obj-y += vm-stop.o

stub-obj-y += vmstate.o

stub-obj-y += win32-kbd-hook.o

stub-obj-y += fd-register.o

stub-obj-y += qmp_memory_device.o

stub-obj-y += target-monitor-defs.o

stubs/win32-kbd-hook.c

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/*

 * Win32 keyboard hook stubs

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or

 * (at your option) any later version.  See the COPYING file in the

 * top-level directory.

 */



#include "qemu/osdep.h"

#include "ui/win32-kbd-hook.h"



void win32_kbd_set_window(void *hwnd)

{

}



void win32_kbd_set_grab(bool grab)

{

}

ui/Makefile.objs

+3 −0
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@@ -15,6 +15,9 @@ common-obj-$(CONFIG_SPICE) += spice-core.o spice-input.o spice-display.o 
common-obj-$(CONFIG_COCOA) += cocoa.o

common-obj-$(CONFIG_VNC) += $(vnc-obj-y)

common-obj-$(call lnot,$(CONFIG_VNC)) += vnc-stubs.o

ifneq (,$(findstring m,$(CONFIG_SDL)$(CONFIG_GTK)))

common-obj-$(CONFIG_WIN32) += win32-kbd-hook.o

endif



# ui-sdl module

common-obj-$(CONFIG_SDL) += sdl.mo

ui/win32-kbd-hook.c

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/*

 * This work is licensed under the terms of the GNU GPL, version 2 or

 * (at your option) any later version.  See the COPYING file in the

 * top-level directory.

 *

 * The win32 keyboard hooking code was imported from project spice-gtk.

 */



#include "qemu/osdep.h"

#include "sysemu/sysemu.h"

#include "ui/win32-kbd-hook.h"



static Notifier win32_unhook_notifier;

static HHOOK win32_keyboard_hook;

static HWND win32_window;

static DWORD win32_grab;



static LRESULT CALLBACK keyboard_hook_cb(int code, WPARAM wparam, LPARAM lparam)

{

    if  (win32_window && code == HC_ACTION && win32_window == GetFocus()) {

        KBDLLHOOKSTRUCT *hooked = (KBDLLHOOKSTRUCT *)lparam;



        if (wparam != WM_KEYUP) {

            DWORD dwmsg = (hooked->flags << 24) |

                          ((hooked->scanCode & 0xff) << 16) | 1;



            switch (hooked->vkCode) {

            case VK_CAPITAL:

                /* fall through */

            case VK_SCROLL:

                /* fall through */

            case VK_NUMLOCK:

                /* fall through */

            case VK_LSHIFT:

                /* fall through */

            case VK_RSHIFT:

                /* fall through */

            case VK_RCONTROL:

                /* fall through */

            case VK_LMENU:

                /* fall through */

            case VK_RMENU:

                break;



            case VK_LCONTROL:

                /*

                 * When pressing AltGr, an extra VK_LCONTROL with a special

                 * scancode with bit 9 set is sent. Let's ignore the extra

                 * VK_LCONTROL, as that will make AltGr misbehave.

                 */

                if (hooked->scanCode & 0x200) {

                    return 1;

                }

                break;



            default:

                if (win32_grab) {

                    SendMessage(win32_window, wparam, hooked->vkCode, dwmsg);

                    return 1;

                }

                break;

            }



        } else {

            switch (hooked->vkCode) {

            case VK_LCONTROL:

                if (hooked->scanCode & 0x200) {

                    return 1;

                }

                break;

            }

        }

    }



    return CallNextHookEx(NULL, code, wparam, lparam);

}



static void keyboard_hook_unhook(Notifier *n, void *data)

{

    UnhookWindowsHookEx(win32_keyboard_hook);

    win32_keyboard_hook = NULL;

}



void win32_kbd_set_window(void *hwnd)

{

    if (hwnd && !win32_keyboard_hook) {

        /* note: the installing thread must have a message loop */

        win32_keyboard_hook = SetWindowsHookEx(WH_KEYBOARD_LL, keyboard_hook_cb,

                                               GetModuleHandle(NULL), 0);

        if (win32_keyboard_hook) {

            win32_unhook_notifier.notify = keyboard_hook_unhook;

            qemu_add_exit_notifier(&win32_unhook_notifier);

        }

    }



    win32_window = hwnd;

}



void win32_kbd_set_grab(bool grab)

{

    win32_grab = grab;

}