[nautilus/wip/antoniof/flowbox-to-gridview: 7/14] icon-controller: Add gestures to children

[António Fernandes <antoniof src gnome org>]

commit 5cf8b6302ede87729e23549e8f70b0ca0924d560
Author: António Fernandes <antoniof gnome org>
Date:   Mon Jan 31 10:52:30 2022 +0000

    icon-controller: Add gestures to children
    
    GtkFlowBox allows us to get a child by its coordinates, but this will
    not be possible with GtkGridView.
    
    Instead, let's add gestures to each children such that we can get the
    clicked widget using gtk_event_controller_get_widget(). This requires
    using the bubble phase such that children can capture the event before
    the parent, and translating event coordinates to the view ones. As we
    can't get the position from the event widget, also introduce a method to
    get the model item from the widget.
    
    While here, rename an outlier callback symbol and remove a GTK3 #if.

 src/nautilus-view-icon-controller.c | 78 ++++++++++++++++++++++---------------
 src/nautilus-view-icon-item-ui.c    | 10 +++++
 src/nautilus-view-icon-item-ui.h    |  1 +
 3 files changed, 57 insertions(+), 32 deletions(-)
---
diff --git a/src/nautilus-view-icon-controller.c b/src/nautilus-view-icon-controller.c
index f13cabdb1..5ffc0588b 100644
--- a/src/nautilus-view-icon-controller.c
+++ b/src/nautilus-view-icon-controller.c
@@ -770,32 +770,28 @@ activate_selection_on_click (NautilusViewIconController *self,
 }
 
 static void
-on_button_press_event (GtkGestureClick *gesture,
-                       gint             n_press,
-                       gdouble          x,
-                       gdouble          y,
-                       gpointer         user_data)
+on_click_pressed (GtkGestureClick *gesture,
+                  gint             n_press,
+                  gdouble          x,
+                  gdouble          y,
+                  gpointer         user_data)
 {
     NautilusViewIconController *self;
+    GtkWidget *event_widget;
     guint button;
-    GdkModifierType modifiers = 0;
+    GdkModifierType modifiers;
     gdouble view_x;
     gdouble view_y;
-    GtkFlowBoxChild *child_at_pos;
 
     self = NAUTILUS_VIEW_ICON_CONTROLLER (user_data);
+    event_widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
     button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
-#if GTK_MAJOR_VERSION < 4
-    gtk_get_current_event_state (&modifiers);
-#else
     modifiers = gtk_event_controller_get_current_event_state (GTK_EVENT_CONTROLLER (gesture));
-#endif
 
-    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)
+    gtk_widget_translate_coordinates (event_widget, GTK_WIDGET (self),
+                                      x, y,
+                                      &view_x, &view_y);
+    if (NAUTILUS_IS_VIEW_ICON_ITEM_UI (event_widget))
     {
         gboolean selection_mode;
 
@@ -817,8 +813,7 @@ on_button_press_event (GtkGestureClick *gesture,
             NautilusViewItemModel *item_model;
             g_autolist (NautilusFile) selection = NULL;
 
-            item_model = g_list_model_get_item (G_LIST_MODEL (self->model),
-                                                gtk_flow_box_child_get_index (child_at_pos));
+            item_model = nautilus_view_icon_item_ui_get_model (NAUTILUS_VIEW_ICON_ITEM_UI (event_widget));
             selected_file = nautilus_view_item_model_get_file (item_model);
             selection = nautilus_view_get_selection (NAUTILUS_VIEW (self));
             if (g_list_find (selection, selected_file) == NULL)
@@ -842,16 +837,21 @@ on_button_press_event (GtkGestureClick *gesture,
         else if (button == GDK_BUTTON_SECONDARY)
         {
             nautilus_files_view_pop_up_selection_context_menu (NAUTILUS_FILES_VIEW (self),
-                                                               x, y);
+                                                               view_x, view_y);
+            gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
         }
     }
     else
     {
-        nautilus_view_set_selection (NAUTILUS_VIEW (self), NULL);
+        if (!self->activate_on_release)
+        {
+            nautilus_view_set_selection (NAUTILUS_VIEW (self), NULL);
+        }
+
         if (button == GDK_BUTTON_SECONDARY)
         {
             nautilus_files_view_pop_up_background_context_menu (NAUTILUS_FILES_VIEW (self),
-                                                                x, y);
+                                                                view_x, view_y);
         }
     }
 }
@@ -889,26 +889,27 @@ on_longpress_gesture_pressed_callback (GtkGestureLongPress *gesture,
                                        gpointer             user_data)
 {
     NautilusViewIconController *self;
-    GtkFlowBoxChild *child_at_pos;
+    GtkWidget *event_widget;
     gdouble view_x;
     gdouble view_y;
 
     self = NAUTILUS_VIEW_ICON_CONTROLLER (user_data);
+    event_widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
 
-    gtk_widget_translate_coordinates (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)),
-                                      GTK_WIDGET (self->view_ui),
+    gtk_widget_translate_coordinates (event_widget,
+                                      GTK_WIDGET (self),
                                       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)
+    if (NAUTILUS_IS_VIEW_ICON_ITEM_UI (event_widget))
     {
         nautilus_files_view_pop_up_selection_context_menu (NAUTILUS_FILES_VIEW (self),
-                                                           x, y);
+                                                           view_x, view_y);
+        gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
     }
     else
     {
         nautilus_view_set_selection (NAUTILUS_VIEW (self), NULL);
         nautilus_files_view_pop_up_background_context_menu (NAUTILUS_FILES_VIEW (self),
-                                                            x, y);
+                                                            view_x, view_y);
     }
 }
 
@@ -1309,9 +1310,23 @@ setup_item_ui (GtkWidget **child,
 {
     NautilusViewIconController *self = NAUTILUS_VIEW_ICON_CONTROLLER (user_data);
     NautilusViewIconItemUi *item_ui;
+    GtkEventController *controller;
 
     item_ui = nautilus_view_icon_item_ui_new ();
     nautilus_view_item_ui_set_caption_attributes (item_ui, self->caption_attributes);
+    controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
+    gtk_widget_add_controller (GTK_WIDGET (item_ui), controller);
+    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_BUBBLE);
+    gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (controller), 0);
+    g_signal_connect (controller, "pressed", G_CALLBACK (on_click_pressed), self);
+    g_signal_connect (controller, "stopped", G_CALLBACK (on_click_stopped), self);
+    g_signal_connect (controller, "released", G_CALLBACK (on_click_released), self);
+
+    controller = GTK_EVENT_CONTROLLER (gtk_gesture_long_press_new ());
+    gtk_widget_add_controller (GTK_WIDGET (item_ui), controller);
+    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_BUBBLE);
+    gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (controller), TRUE);
+    g_signal_connect (controller, "pressed", G_CALLBACK (on_longpress_gesture_pressed_callback), self);
 
     *child = gtk_flow_box_child_new ();
     gtk_flow_box_child_set_child (GTK_FLOW_BOX_CHILD (*child),
@@ -1401,13 +1416,12 @@ constructed (GObject *object)
 
     self->view_icon = g_themed_icon_new ("view-grid-symbolic");
 
-    /* Compensating for the lack of event boxen to allow clicks outside the flow box. */
     controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
     gtk_widget_add_controller (GTK_WIDGET (content_widget), controller);
-    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_CAPTURE);
+    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_BUBBLE);
     gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (controller), 0);
     g_signal_connect (controller, "pressed",
-                      G_CALLBACK (on_button_press_event), self);
+                      G_CALLBACK (on_click_pressed), self);
     g_signal_connect (controller, "stopped",
                       G_CALLBACK (on_click_stopped), self);
     g_signal_connect (controller, "released",
@@ -1415,7 +1429,7 @@ constructed (GObject *object)
 
     controller = GTK_EVENT_CONTROLLER (gtk_gesture_long_press_new ());
     gtk_widget_add_controller (GTK_WIDGET (self->view_ui), controller);
-    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_CAPTURE);
+    gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_BUBBLE);
     gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (controller), TRUE);
     g_signal_connect (controller, "pressed",
                       (GCallback) on_longpress_gesture_pressed_callback, self);
diff --git a/src/nautilus-view-icon-item-ui.c b/src/nautilus-view-icon-item-ui.c
index b638f5315..8e23d3580 100644
--- a/src/nautilus-view-icon-item-ui.c
+++ b/src/nautilus-view-icon-item-ui.c
@@ -275,6 +275,16 @@ nautilus_view_icon_item_ui_set_model (NautilusViewIconItemUi *self,
     g_object_set (self, "model", model, NULL);
 }
 
+NautilusViewItemModel *
+nautilus_view_icon_item_ui_get_model (NautilusViewIconItemUi *self)
+{
+    NautilusViewItemModel *model = NULL;
+
+    g_object_get (self, "model", &model, NULL);
+
+    return model;
+}
+
 void
 nautilus_view_item_ui_set_caption_attributes (NautilusViewIconItemUi *self,
                                               GQuark                 *attrs)
diff --git a/src/nautilus-view-icon-item-ui.h b/src/nautilus-view-icon-item-ui.h
index 09fcf7f0c..3f6c62e5b 100644
--- a/src/nautilus-view-icon-item-ui.h
+++ b/src/nautilus-view-icon-item-ui.h
@@ -22,6 +22,7 @@ G_DECLARE_FINAL_TYPE (NautilusViewIconItemUi, nautilus_view_icon_item_ui, NAUTIL
 NautilusViewIconItemUi * nautilus_view_icon_item_ui_new (void);
 void nautilus_view_icon_item_ui_set_model (NautilusViewIconItemUi *self,
                                            NautilusViewItemModel  *model);
+NautilusViewItemModel *nautilus_view_icon_item_ui_get_model (NautilusViewIconItemUi *self);
 void nautilus_view_item_ui_set_caption_attributes (NautilusViewIconItemUi *self,
                                                    GQuark                 *attrs);