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: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 20200516072014.7766-1-vr_qemu@t-online.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2020-05-16 09:20:04 +02:00 committed by Gerd Hoffmann
parent debe78ce14
commit 2df9f5718d
5 changed files with 138 additions and 0 deletions

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@ -0,0 +1,14 @@
/*
* 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

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@ -32,6 +32,7 @@ stub-obj-y += trace-control.o
stub-obj-y += uuid.o stub-obj-y += uuid.o
stub-obj-y += vm-stop.o stub-obj-y += vm-stop.o
stub-obj-y += vmstate.o stub-obj-y += vmstate.o
stub-obj-y += win32-kbd-hook.o
stub-obj-y += fd-register.o stub-obj-y += fd-register.o
stub-obj-y += qmp_memory_device.o stub-obj-y += qmp_memory_device.o
stub-obj-y += target-monitor-defs.o stub-obj-y += target-monitor-defs.o

18
stubs/win32-kbd-hook.c Normal file
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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)
{
}

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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-$(CONFIG_COCOA) += cocoa.o
common-obj-$(CONFIG_VNC) += $(vnc-obj-y) common-obj-$(CONFIG_VNC) += $(vnc-obj-y)
common-obj-$(call lnot,$(CONFIG_VNC)) += vnc-stubs.o common-obj-$(call lnot,$(CONFIG_VNC)) += vnc-stubs.o
ifneq (,$(findstring m,$(CONFIG_SDL)$(CONFIG_GTK)))
common-obj-$(CONFIG_WIN32) += win32-kbd-hook.o
endif
# ui-sdl module # ui-sdl module
common-obj-$(CONFIG_SDL) += sdl.mo common-obj-$(CONFIG_SDL) += sdl.mo

102
ui/win32-kbd-hook.c Normal file
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@ -0,0 +1,102 @@
/*
* 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;
}