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compositor: Add MetaWindowDrag API to add a hint on the grab coordinates

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This is added as a hint so that the caller can optionally use it, e.g.
in the case that a window drag is driven by the mouse. This will be used
to more accurately follow the drag position, other than starting at the
current pointer position.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3546>
This commit is contained in:
Carlos Garnacho 2024-01-25 12:38:01 +01:00
parent 4fa2706b9b
commit e4542a6495
2 changed files with 20 additions and 0 deletions
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17
src/compositor/meta-window-drag.c
View File

@ -56,6 +56,8 @@ struct _MetaWindowDrag {
MetaGrabOp grab_op; MetaGrabOp grab_op;
ClutterGrab *grab; ClutterGrab *grab;
graphene_point_t pos_hint;
ClutterInputDevice *leading_device; ClutterInputDevice *leading_device;
ClutterEventSequence *leading_touch_sequence; ClutterEventSequence *leading_touch_sequence;
double anchor_rel_x; double anchor_rel_x;
@ -79,6 +81,7 @@ struct _MetaWindowDrag {
guint tile_preview_timeout_id; guint tile_preview_timeout_id;
guint preview_tile_mode : 2; guint preview_tile_mode : 2;
guint pos_hint_set : 1;
}; };
G_DEFINE_FINAL_TYPE (MetaWindowDrag, meta_window_drag, G_TYPE_OBJECT) G_DEFINE_FINAL_TYPE (MetaWindowDrag, meta_window_drag, G_TYPE_OBJECT)
@ -1781,6 +1784,11 @@ meta_window_drag_begin (MetaWindowDrag *window_drag,
{ {
warp_grab_pointer (window_drag, window, grab_op, &root_x, &root_y); warp_grab_pointer (window_drag, window, grab_op, &root_x, &root_y);
} }
else if (window_drag->pos_hint_set)
{
root_x = window_drag->pos_hint.x;
root_y = window_drag->pos_hint.y;
}
else else
{ {
ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend); ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
@ -1917,3 +1925,12 @@ meta_window_drag_update_edges (MetaWindowDrag *window_drag)
{ {
meta_window_drag_edge_resistance_cleanup (window_drag); meta_window_drag_edge_resistance_cleanup (window_drag);
} }
void
meta_window_drag_set_position_hint (MetaWindowDrag *window_drag,
graphene_point_t *pos_hint)
{
window_drag->pos_hint_set = pos_hint != NULL;
if (pos_hint)
window_drag->pos_hint = *pos_hint;
}

3
src/compositor/meta-window-drag.h
View File

@ -43,3 +43,6 @@ MetaWindow * meta_window_drag_get_window (MetaWindowDrag *window_drag);
MetaGrabOp meta_window_drag_get_grab_op (MetaWindowDrag *window_drag); MetaGrabOp meta_window_drag_get_grab_op (MetaWindowDrag *window_drag);
void meta_window_drag_update_edges (MetaWindowDrag *window_drag); void meta_window_drag_update_edges (MetaWindowDrag *window_drag);
void meta_window_drag_set_position_hint (MetaWindowDrag *window_drag,
graphene_point_t *pos_hint);