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Call the windows message hook while inside a modal message loop

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Fixes https://github.com/libsdl-org/SDL/issues/12029
This commit is contained in:
Sam Lantinga 2025-01-20 15:07:39 -08:00
parent b6d0bc0431
commit b476695e67
2 changed files with 50 additions and 16 deletions
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65
src/video/windows/SDL_windowsevents.c
View file

@ -174,6 +174,16 @@ static Uint64 WIN_GetEventTimestamp(void)
return timestamp;
}
// A message hook called before TranslateMessage()
static SDL_WindowsMessageHook g_WindowsMessageHook = NULL;
static void *g_WindowsMessageHookData = NULL;
void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
{
g_WindowsMessageHook = callback;
g_WindowsMessageHookData = userdata;
}
static SDL_Scancode WindowsScanCodeToSDLScanCode(LPARAM lParam, WPARAM wParam, Uint16 *rawcode, bool *virtual_key)
{
SDL_Scancode code;
@ -1042,6 +1052,25 @@ static bool SkipAltGrLeftControl(WPARAM wParam, LPARAM lParam)
return false;
}
static bool DispatchModalLoopMessageHook(HWND *hwnd, UINT *msg, WPARAM *wParam, LPARAM *lParam)
{
MSG dummy;
SDL_zero(dummy);
dummy.hwnd = *hwnd;
dummy.message = *msg;
dummy.wParam = *wParam;
dummy.lParam = *lParam;
if (g_WindowsMessageHook(g_WindowsMessageHookData, &dummy)) {
// Can't modify the hwnd, but everything else is fair game
*msg = dummy.message;
*wParam = dummy.wParam;
*lParam = dummy.lParam;
return true;
}
return false;
}
LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
SDL_WindowData *data;
@ -1071,6 +1100,14 @@ LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
}
#endif // WMMSG_DEBUG
if (g_WindowsMessageHook && data->in_modal_loop) {
// Synthesize a message for window hooks so they can modify the message if desired
if (!DispatchModalLoopMessageHook(&hwnd, &msg, &wParam, &lParam)) {
return 0;
}
}
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
if (WIN_HandleIMEMessage(hwnd, msg, wParam, &lParam, data->videodata)) {
return 0;
@ -1684,12 +1721,15 @@ LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
case WM_ENTERSIZEMOVE:
case WM_ENTERMENULOOP:
{
data->initial_size_rect.left = data->window->x;
data->initial_size_rect.right = data->window->x + data->window->w;
data->initial_size_rect.top = data->window->y;
data->initial_size_rect.bottom = data->window->y + data->window->h;
++data->in_modal_loop;
if (data->in_modal_loop == 1) {
data->initial_size_rect.left = data->window->x;
data->initial_size_rect.right = data->window->x + data->window->w;
data->initial_size_rect.top = data->window->y;
data->initial_size_rect.bottom = data->window->y + data->window->h;
SetTimer(hwnd, (UINT_PTR)SDL_IterateMainCallbacks, USER_TIMER_MINIMUM, NULL);
SetTimer(hwnd, (UINT_PTR)SDL_IterateMainCallbacks, USER_TIMER_MINIMUM, NULL);
}
} break;
case WM_TIMER:
@ -1703,7 +1743,10 @@ LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
case WM_EXITSIZEMOVE:
case WM_EXITMENULOOP:
{
KillTimer(hwnd, (UINT_PTR)SDL_IterateMainCallbacks);
--data->in_modal_loop;
if (data->in_modal_loop == 0) {
KillTimer(hwnd, (UINT_PTR)SDL_IterateMainCallbacks);
}
} break;
case WM_SIZING:
@ -2305,16 +2348,6 @@ static void WIN_UpdateMouseCapture(void)
}
#endif // !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
// A message hook called before TranslateMessage()
static SDL_WindowsMessageHook g_WindowsMessageHook = NULL;
static void *g_WindowsMessageHookData = NULL;
void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
{
g_WindowsMessageHook = callback;
g_WindowsMessageHookData = userdata;
}
int WIN_WaitEventTimeout(SDL_VideoDevice *_this, Sint64 timeoutNS)
{
if (g_WindowsEnableMessageLoop) {

1
src/video/windows/SDL_windowswindow.h
View file

@ -83,6 +83,7 @@ struct SDL_WindowData
bool in_window_deactivation;
bool force_ws_maximizebox;
bool disable_move_size_events;
int in_modal_loop;
RECT initial_size_rect;
RECT cursor_clipped_rect; // last successfully committed clipping rect for this window
RECT cursor_ctrlock_rect; // this is Windows-specific, but probably does not need to be per-window