[nautilus/wip/corey/list-base-click] list-base: Make view click pressed event controller better

[Corey Berla <coreyberla src gnome org>]

commit 485e28ec444e3528bc7cf17c8b101baa81fc9e23
Author: Corey Berla <corey berla me>
Date:   Tue Aug 23 20:32:31 2022 -0700

    list-base: Make view click pressed event controller better
    
    Our view click handling has an unnecessary workaround to deal with
    the propagation from item clicks.  We set the flag deny_background_click
    when an item is clicked, and then clear it on release/stop.  This is a
    little hard to follow and I think might be contributing to problems
    such a quasi-activated state for some items.
    
    Set the propagation phase to TARGET on the view.  This works out of the
    box for the GridView.  ColumnView is implemented using a child
    ListView, so we have to get that by looking at the child's silbing.

 src/nautilus-list-base.c | 29 +++++++++++------------------
 1 file changed, 11 insertions(+), 18 deletions(-)
---
diff --git a/src/nautilus-list-base.c b/src/nautilus-list-base.c
index 568070d1b..b3f34f78d 100644
--- a/src/nautilus-list-base.c
+++ b/src/nautilus-list-base.c
@@ -45,7 +45,6 @@ struct _NautilusListBasePrivate
 
     gboolean single_click_mode;
     gboolean activate_on_release;
-    gboolean deny_background_click;
 
     GdkDragAction drag_item_action;
     GdkDragAction drag_view_action;
@@ -359,7 +358,6 @@ on_item_click_pressed (GtkGestureClick *gesture,
     selection_mode = (modifiers & (GDK_CONTROL_MASK | GDK_SHIFT_MASK));
 
     /* Before anything else, store event state to be read by other handlers. */
-    priv->deny_background_click = TRUE;
     priv->activate_on_release = (priv->single_click_mode &&
                                  button == GDK_BUTTON_PRIMARY &&
                                  n_press == 1 &&
@@ -427,7 +425,6 @@ on_item_click_released (GtkGestureClick *gesture,
 
     rubberband_set_state (self, TRUE);
     priv->activate_on_release = FALSE;
-    priv->deny_background_click = FALSE;
 }
 
 static void
@@ -440,7 +437,6 @@ on_item_click_stopped (GtkGestureClick *gesture,
 
     rubberband_set_state (self, TRUE);
     priv->activate_on_release = FALSE;
-    priv->deny_background_click = FALSE;
 }
 
 static void
@@ -451,18 +447,10 @@ on_view_click_pressed (GtkGestureClick *gesture,
                        gpointer         user_data)
 {
     NautilusListBase *self = user_data;
-    NautilusListBasePrivate *priv = nautilus_list_base_get_instance_private (self);
     guint button;
     GdkModifierType modifiers;
     gboolean selection_mode;
 
-    if (priv->deny_background_click)
-    {
-        /* Item was clicked. */
-        gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_DENIED);
-        return;
-    }
-
     /* We are overriding many of the gestures for the views so let's make sure to
      * grab the focus in order to make rubberbanding and background click work */
     gtk_widget_grab_focus (GTK_WIDGET (self));
@@ -990,10 +978,6 @@ real_begin_loading (NautilusFilesView *files_view)
     nautilus_files_view_update_context_menus (files_view);
     nautilus_files_view_update_toolbar_menus (files_view);
 
-    /* When double clicking on an item this deny_background_click can persist
-     * because the new view interrupts the gesture sequence, so lets reset it.*/
-    priv->deny_background_click = FALSE;
-
     /* When DnD is used to navigate between directories, the normal callbacks
      * are ignored. Update DnD variables here upon navigating to a directory*/
     if (gtk_drop_target_get_current_drop (priv->view_drop_target) != NULL)
@@ -1756,16 +1740,25 @@ nautilus_list_base_setup_gestures (NautilusListBase *self)
     NautilusListBasePrivate *priv = nautilus_list_base_get_instance_private (self);
     GtkEventController *controller;
     GtkDropTarget *drop_target;
+    GtkWidget *view_ui = nautilus_list_base_get_view_ui (self);
+
+    if (GTK_IS_COLUMN_VIEW (view_ui))
+    {
+        /* ListView is the top-most widget in a ColumnView */
+        view_ui = gtk_widget_get_next_sibling (gtk_widget_get_first_child (view_ui));
+    }
 
     controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
-    gtk_widget_add_controller (GTK_WIDGET (self), controller);
+    gtk_widget_add_controller (view_ui, controller);
     gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (controller), 0);
+    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_TARGET);
     g_signal_connect (controller, "pressed",
                       G_CALLBACK (on_view_click_pressed), self);
 
     controller = GTK_EVENT_CONTROLLER (gtk_gesture_long_press_new ());
-    gtk_widget_add_controller (GTK_WIDGET (self), controller);
+    gtk_widget_add_controller (view_ui, controller);
     gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (controller), TRUE);
+    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_TARGET);
     g_signal_connect (controller, "pressed",
                       G_CALLBACK (on_view_longpress_pressed), self);