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Fixed bug 3332 - Win32: reset deadkeys in StartTextInput/StopTextInput

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Eric Wasylishen

The bug here is that a dead keys pressed before calling SDL_StartTextInput() carries over into future text input, so the next key pressed will have the deadkey applied to it.

This in undesirable, imho, and doesn't occur on OS X (haven't check Linux or elsewhere). It's causing a problem for Quakespasm on German keyboard layouts, where we use the ^ deadkey to toggle the console (which enables/disables text input), and ^ characters are showing up in the TEXTINPUT events.
This commit is contained in:
Sam Lantinga 2016-10-01 11:54:02 -07:00
parent 708def87f3
commit 1e6e595484
1 changed files with 48 additions and 2 deletions
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50
src/video/windows/SDL_windowskeyboard.c
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@ -157,11 +157,51 @@ WIN_QuitKeyboard(_THIS)
#endif
}
void
WIN_ResetDeadKeys()
{
/*
if a deadkey has been typed, but not the next character (which the deadkey might modify),
this tries to undo the effect pressing the deadkey.
see: http://archives.miloush.net/michkap/archive/2006/09/10/748775.html
*/
BYTE keyboardState[256];
WCHAR buffer[16];
int keycode, scancode, result, i;
GetKeyboardState(keyboardState);
keycode = VK_SPACE;
scancode = MapVirtualKey(keycode, MAPVK_VK_TO_VSC);
if (scancode == 0)
{
/* the keyboard doesn't have this key */
return;
}
for (i = 0; i < 5; i++)
{
result = ToUnicode(keycode, scancode, keyboardState, (LPWSTR)buffer, 16, 0);
if (result > 0)
{
/* success */
return;
}
}
}
void
WIN_StartTextInput(_THIS)
{
#ifndef SDL_DISABLE_WINDOWS_IME
SDL_Window *window = SDL_GetKeyboardFocus();
SDL_Window *window;
#endif
WIN_ResetDeadKeys();
#ifndef SDL_DISABLE_WINDOWS_IME
window = SDL_GetKeyboardFocus();
if (window) {
HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
SDL_VideoData *videodata = (SDL_VideoData *)_this->driverdata;
@ -176,7 +216,13 @@ void
WIN_StopTextInput(_THIS)
{
#ifndef SDL_DISABLE_WINDOWS_IME
SDL_Window *window = SDL_GetKeyboardFocus();
SDL_Window *window;
#endif
WIN_ResetDeadKeys();
#ifndef SDL_DISABLE_WINDOWS_IME
window = SDL_GetKeyboardFocus();
if (window) {
HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
SDL_VideoData *videodata = (SDL_VideoData *)_this->driverdata;