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fix mouse jumping: query GDK pointer position at call time

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Flutter's globalPosition is window-relative, not screen-absolute.
Now using gdk_device_get_position() on the native side to get
the actual screen coordinates at the moment startDrag/startResize
is called. Dart no longer passes coordinates — the native handler
queries the pointer directly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-04-23 09:47:44 +02:00
co-authored by Claude Opus 4.6
parent 5debc57d31
commit fa0adb0998
5 changed files with 20 additions and 27 deletions
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linux/runner/my_application.cc
+13 -13
View File
@@ -157,28 +157,28 @@ static void my_application_activate(GApplication* application) {
g_autoptr(FlMethodResponse) response = nullptr;
if (g_strcmp0(method, "startDrag") == 0) {
FlValue* args = fl_method_call_get_args(method_call);
int x = 0, y = 0;
if (fl_value_get_type(args) == FL_VALUE_TYPE_MAP) {
FlValue* vx = fl_value_lookup_string(args, "x");
FlValue* vy = fl_value_lookup_string(args, "y");
if (vx) x = (int)fl_value_get_int(vx);
if (vy) y = (int)fl_value_get_int(vy);
}
GdkDisplay* display = gtk_widget_get_display(GTK_WIDGET(w));
GdkSeat* seat = gdk_display_get_default_seat(display);
GdkDevice* pointer = gdk_seat_get_pointer(seat);
gint x = 0, y = 0;
gdk_device_get_position(pointer, nullptr, &x, &y);
gtk_window_begin_move_drag(w, 1, x, y, GDK_CURRENT_TIME);
response = FL_METHOD_RESPONSE(
fl_method_success_response_new(fl_value_new_null()));
} else if (g_strcmp0(method, "startResize") == 0) {
FlValue* args = fl_method_call_get_args(method_call);
int edge = 7, x = 0, y = 0;
int edge = 7;
if (fl_value_get_type(args) == FL_VALUE_TYPE_MAP) {
FlValue* ve = fl_value_lookup_string(args, "edge");
FlValue* vx = fl_value_lookup_string(args, "x");
FlValue* vy = fl_value_lookup_string(args, "y");
if (ve) edge = (int)fl_value_get_int(ve);
if (vx) x = (int)fl_value_get_int(vx);
if (vy) y = (int)fl_value_get_int(vy);
} else if (fl_value_get_type(args) == FL_VALUE_TYPE_INT) {
edge = (int)fl_value_get_int(args);
}
GdkDisplay* display = gtk_widget_get_display(GTK_WIDGET(w));
GdkSeat* seat = gdk_display_get_default_seat(display);
GdkDevice* pointer = gdk_seat_get_pointer(seat);
gint x = 0, y = 0;
gdk_device_get_position(pointer, nullptr, &x, &y);
static const GdkWindowEdge edges[] = {
GDK_WINDOW_EDGE_NORTH_WEST, GDK_WINDOW_EDGE_NORTH,
GDK_WINDOW_EDGE_NORTH_EAST, GDK_WINDOW_EDGE_WEST,