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Merge branch 'gtk3-dnd-find-dest-window-fix' into 'gtk-3-24'

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GdkWin32: Fix DND destination window search

See merge request GNOME/gtk!3885
This commit is contained in:
Luca Bacci 2021-11-13 14:51:49 +00:00
commit a174568ef9
2 changed files with 66 additions and 83 deletions
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81
gdk/win32/gdkdnd-win32.c
View File

@ -2204,43 +2204,6 @@ _gdk_win32_window_get_drag_protocol (GdkWindow *window,
return protocol;
}
typedef struct {
gint x;
gint y;
HWND ignore;
HWND result;
} find_window_enum_arg;
static BOOL CALLBACK
find_window_enum_proc (HWND hwnd,
LPARAM lparam)
{
RECT rect;
POINT tl, br;
find_window_enum_arg *a = (find_window_enum_arg *) lparam;
if (hwnd == a->ignore)
return TRUE;
if (!IsWindowVisible (hwnd))
return TRUE;
tl.x = tl.y = 0;
ClientToScreen (hwnd, &tl);
GetClientRect (hwnd, &rect);
br.x = rect.right;
br.y = rect.bottom;
ClientToScreen (hwnd, &br);
if (a->x >= tl.x && a->y >= tl.y && a->x < br.x && a->y < br.y)
{
a->result = hwnd;
return FALSE;
}
else
return TRUE;
}
static GdkWindow *
gdk_win32_drag_context_find_window (GdkDragContext *context,
GdkWindow *drag_window,
@ -2250,33 +2213,31 @@ gdk_win32_drag_context_find_window (GdkDragContext *context,
GdkDragProtocol *protocol)
{
GdkWin32DragContext *context_win32 = GDK_WIN32_DRAG_CONTEXT (context);
GdkWindow *dest_window, *dw;
find_window_enum_arg a;
GdkWindow *toplevel = NULL;
HWND hwnd = NULL;
POINT pt;
a.x = x_root * context_win32->scale - _gdk_offset_x;
a.y = y_root * context_win32->scale - _gdk_offset_y;
a.ignore = drag_window ? GDK_WINDOW_HWND (drag_window) : NULL;
a.result = NULL;
pt.x = x_root * context_win32->scale - _gdk_offset_x;
pt.y = y_root * context_win32->scale - _gdk_offset_y;
GDK_NOTE (DND,
g_print ("gdk_drag_find_window_real: %p %+d%+d\n",
(drag_window ? GDK_WINDOW_HWND (drag_window) : NULL),
a.x, a.y));
g_print ("gdk_drag_find_window_real: %+d%+d\n",
(int) pt.x, (int) pt.y));
EnumWindows (find_window_enum_proc, (LPARAM) &a);
hwnd = WindowFromPoint (pt);
if (a.result == NULL)
dest_window = NULL;
else
if (hwnd)
{
dw = gdk_win32_handle_table_lookup (a.result);
if (dw)
GdkWindow *window = gdk_win32_handle_table_lookup (hwnd);
if (window)
{
dest_window = gdk_window_get_toplevel (dw);
g_object_ref (dest_window);
toplevel = gdk_window_get_toplevel (window);
g_object_ref (toplevel);
}
else
dest_window = gdk_win32_window_foreign_new_for_display (gdk_screen_get_display (screen), a.result);
toplevel = gdk_win32_window_foreign_new_for_display (gdk_screen_get_display (screen), hwnd);
}
if (use_ole2_dnd)
*protocol = GDK_DRAG_PROTO_OLE2;
@ -2284,17 +2245,15 @@ gdk_win32_drag_context_find_window (GdkDragContext *context,
*protocol = GDK_DRAG_PROTO_LOCAL;
else
*protocol = GDK_DRAG_PROTO_WIN32_DROPFILES;
}
GDK_NOTE (DND,
g_print ("gdk_drag_find_window: %p %+d%+d: %p: %p %s\n",
(drag_window ? GDK_WINDOW_HWND (drag_window) : NULL),
g_print ("gdk_drag_find_window: %+d%+d: %p: %p %s\n",
x_root, y_root,
a.result,
(dest_window ? GDK_WINDOW_HWND (dest_window) : NULL),
hwnd,
(toplevel ? GDK_WINDOW_HWND (toplevel) : NULL),
_gdk_win32_drag_protocol_to_string (*protocol)));
return dest_window;
return toplevel;
}
static gboolean

50
gdk/win32/gdkwindow-win32.c
View File

@ -885,13 +885,13 @@ _gdk_win32_display_create_window_impl (GdkDisplay *display,
if (impl->type_hint == GDK_WINDOW_TYPE_HINT_UTILITY)
dwExStyle |= WS_EX_TOOLWINDOW;
/* WS_EX_TRANSPARENT means "try draw this window last, and ignore input".
* It's the last part we're after. We don't want DND indicator to accept
* input, because that will make it a potential drop target, and if it's
* under the mouse cursor, this will kill any DND.
/* WS_EX_LAYERED | WS_EX_TRANSPARENT makes the window transparent w.r.t.
* pointer input: the system will direct all pointer input to the window
* below. We don't want a DND indicator to accept pointer input, because
* that will make it a potential drop target.
*/
if (impl->type_hint == GDK_WINDOW_TYPE_HINT_DND)
dwExStyle |= WS_EX_TRANSPARENT;
dwExStyle |= WS_EX_LAYERED | WS_EX_TRANSPARENT;
klass = RegisterGdkClass (window->window_type, impl->type_hint);
@ -1277,10 +1277,10 @@ show_window_internal (GdkWindow *window,
exstyle = GetWindowLong (GDK_WINDOW_HWND (window), GWL_EXSTYLE);
/* Use SetWindowPos to show transparent windows so automatic redraws
* in other windows can be suppressed.
/* If we have to show an input-only window,
* redraws can be safely skipped.
*/
if (exstyle & WS_EX_TRANSPARENT)
if (window->input_only)
{
UINT flags = SWP_SHOWWINDOW | SWP_NOREDRAW | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER;
@ -1416,7 +1416,6 @@ show_window_internal (GdkWindow *window,
}
}
if (window->state & GDK_WINDOW_STATE_FULLSCREEN)
{
gdk_window_fullscreen (window);
@ -1489,10 +1488,10 @@ gdk_win32_window_hide (GdkWindow *window)
if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_TOPLEVEL)
ShowOwnedPopups (GDK_WINDOW_HWND (window), FALSE);
/* Use SetWindowPos to hide transparent windows so automatic redraws
* in other windows can be suppressed.
/* If we have to hide an input-only window,
* readraws can be safely skipped.
*/
if (GetWindowLong (GDK_WINDOW_HWND (window), GWL_EXSTYLE) & WS_EX_TRANSPARENT)
if (window->input_only)
{
SetWindowPos (GDK_WINDOW_HWND (window), SWP_NOZORDER_SPECIFIED,
0, 0, 0, 0,
@ -2787,6 +2786,7 @@ _gdk_win32_window_update_style_bits (GdkWindow *window)
GdkWindowImplWin32 *impl = (GdkWindowImplWin32 *)window->impl;
GdkWMDecoration decorations;
LONG old_style, new_style, old_exstyle, new_exstyle;
gboolean needs_basic_layering = FALSE;
gboolean all;
RECT rect, before, after;
gboolean was_topmost;
@ -2842,7 +2842,18 @@ _gdk_win32_window_update_style_bits (GdkWindow *window)
else
impl->layered = FALSE;
if (impl->layered)
/* DND windows need to have the WS_EX_TRANSPARENT | WS_EX_LAYERED styles
* set so to behave in input passthrough mode. That's essential for DND
* indicators.
*/
if (!impl->layered &&
GDK_WINDOW_HWND (window) != NULL &&
impl->type_hint == GDK_WINDOW_TYPE_HINT_DND)
{
needs_basic_layering = TRUE;
}
if (impl->layered || needs_basic_layering)
new_exstyle |= WS_EX_LAYERED;
else
new_exstyle &= ~WS_EX_LAYERED;
@ -2859,6 +2870,19 @@ _gdk_win32_window_update_style_bits (GdkWindow *window)
update_single_bit (&new_style, all, decorations & GDK_DECOR_MAXIMIZE, WS_MAXIMIZEBOX);
}
if (needs_basic_layering)
{
/* SetLayeredWindowAttributes may have been already called, e.g. to set an opacity level.
* We only have to call the API in case it has never been called before on the window.
*/
if (SetLastError(0),
!GetLayeredWindowAttributes (GDK_WINDOW_HWND (window), NULL, NULL, NULL) &&
GetLastError() == 0)
{
API_CALL (SetLayeredWindowAttributes, (GDK_WINDOW_HWND (window), 0, 255, LWA_ALPHA));
}
}
if (old_style == new_style && old_exstyle == new_exstyle )
{
GDK_NOTE (MISC, g_print ("_gdk_win32_window_update_style_bits: %p: no change\n",