[nautilus/wip/antoniof/flow-box-preparation: 4/20] view-icon-controller: Fix selection when scrolled

[António Fernandes <antoniof src gnome org>]

commit a871c29565c3d8da50e32cde2b3fff61e49dddad
Author: António Fernandes <antoniof gnome org>
Date:   Wed Dec 8 23:25:56 2021 +0000

    view-icon-controller: Fix selection when scrolled
    
    We add a click gesture to the scrolled window, not the view itself,
    because we need to get background context menus on whitespace around
    the flowbox (not only padding but bottom whitespace when the rows
    don't fill the whole height).
    
    Because of that, the selected item may not be the one which the user
    had selected (e.g. if the view is scrolled away from the top).
    
    Translate the coordinates properly to properly select the item where
    the user had clicked. Do the same for the longpress gesture.

 src/nautilus-view-icon-controller.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/src/nautilus-view-icon-controller.c b/src/nautilus-view-icon-controller.c
index 569cbed51..48d30c294 100644
--- a/src/nautilus-view-icon-controller.c
+++ b/src/nautilus-view-icon-controller.c
@@ -698,6 +698,8 @@ on_button_press_event (GtkGestureMultiPress *gesture,
     GdkEventSequence *sequence;
     const GdkEvent *event;
     g_autolist (NautilusFile) selection = NULL;
+    gint view_x;
+    gint view_y;
     GtkFlowBoxChild *child_at_pos;
 
     self = NAUTILUS_VIEW_ICON_CONTROLLER (user_data);
@@ -707,7 +709,11 @@ on_button_press_event (GtkGestureMultiPress *gesture,
 
     /* Need to update the selection so the popup has the right actions enabled */
     selection = nautilus_view_get_selection (NAUTILUS_VIEW (self));
-    child_at_pos = gtk_flow_box_get_child_at_pos (self->view_ui, x, y);
+
+    gtk_widget_translate_coordinates (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)),
+                                      GTK_WIDGET (self->view_ui),
+                                      x, y, &view_x, &view_y);
+    child_at_pos = gtk_flow_box_get_child_at_pos (self->view_ui, view_x, view_y);
     if (child_at_pos != NULL)
     {
         NautilusFile *selected_file;
@@ -756,6 +762,8 @@ on_longpress_gesture_pressed_callback (GtkGestureLongPress *gesture,
     GtkFlowBoxChild *child_at_pos;
     GdkEventSequence *event_sequence;
     GdkEvent *event;
+    gint view_x;
+    gint view_y;
 
     event_sequence = gtk_gesture_get_last_updated_sequence (GTK_GESTURE (gesture));
     event = (GdkEvent *) gtk_gesture_get_last_event (GTK_GESTURE (gesture), event_sequence);
@@ -764,7 +772,10 @@ on_longpress_gesture_pressed_callback (GtkGestureLongPress *gesture,
 
     /* Need to update the selection so the popup has the right actions enabled */
     selection = nautilus_view_get_selection (NAUTILUS_VIEW (self));
-    child_at_pos = gtk_flow_box_get_child_at_pos (self->view_ui, x, y);
+    gtk_widget_translate_coordinates (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)),
+                                      GTK_WIDGET (self->view_ui),
+                                      x, y, &view_x, &view_y);
+    child_at_pos = gtk_flow_box_get_child_at_pos (self->view_ui, view_x, view_y);
     if (child_at_pos != NULL)
     {
         NautilusFile *selected_file;