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GdkWin32: Fix handling of WM_NCHITTEST

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Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/5114
This commit is contained in:
Luca Bacci 2022-08-19 19:21:17 +02:00
parent 3a8e45963f
commit 5e299cd3d2
1 changed files with 24 additions and 17 deletions
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41
gdk/win32/gdkevents-win32.c
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@ -1433,35 +1433,42 @@ handle_nchittest (HWND hwnd,
gint16 screen_y,
int *ret_valp)
{
RECT rect;
GdkWin32Surface *impl;
RECT client_rect;
POINT client_pt;
if (window == NULL || window->input_region == NULL)
if (window == NULL)
return FALSE;
/* If the window has decorations, DefWindowProc() will take
* care of NCHITTEST.
*/
if (!_gdk_win32_surface_lacks_wm_decorations (window))
/* If the window has no particular input pass-through region,
* then we can simply let DefWindowProc() handle the message */
if (window->input_region == NULL)
return FALSE;
if (!GetWindowRect (hwnd, &rect))
if (!GetClientRect (hwnd, &client_rect))
return FALSE;
client_pt.x = screen_x;
client_pt.y = screen_y;
if (!ScreenToClient (hwnd, &client_pt))
return FALSE;
/* Check whether the point lies within the client area */
if (!PtInRect (&client_rect, client_pt))
return FALSE;
impl = GDK_WIN32_SURFACE (window);
rect.left = screen_x - rect.left;
rect.top = screen_y - rect.top;
/* If it's inside the rect, return FALSE and let DefWindowProc() handle it */
/* If the point lies inside the input region, return HTCLIENT,
* otherwise return HTTRANSPARENT. */
if (cairo_region_contains_point (window->input_region,
rect.left / impl->surface_scale,
rect.top / impl->surface_scale))
return FALSE;
client_pt.x / impl->surface_scale,
client_pt.y / impl->surface_scale))
*ret_valp = HTCLIENT;
else
*ret_valp = HTTRANSPARENT;
/* Otherwise override DefWindowProc() and tell WM that the point is not
* within the window
*/
*ret_valp = HTNOWHERE;
/* We handled the message, no need to call DefWindowProc() */
return TRUE;
}