[nautilus/wip/antoniof/reimplement-search-tags: 4/6] query-editor: Don't use GtkSearchEntry

[António Fernandes <antoniof src gnome org>]

commit ecd73b39eda0a2b05617869a9aaa12dddc45a0a2
Author: António Fernandes <antoniof gnome org>
Date:   Fri Apr 22 17:30:00 2022 +0100

    query-editor: Don't use GtkSearchEntry
    
    We are going to reintroduce support for filter tags, so we need to
    build our own custom entry from GtkText up.
    
    Reimplement the parts of GtkSearchEntry that we need.

 src/nautilus-query-editor.c   | 130 ++++++++++++++++++++++++++++--------------
 src/resources/css/Adwaita.css |  19 ++++++
 2 files changed, 105 insertions(+), 44 deletions(-)
---
diff --git a/src/nautilus-query-editor.c b/src/nautilus-query-editor.c
index c36d0026a..07d9497e0 100644
--- a/src/nautilus-query-editor.c
+++ b/src/nautilus-query-editor.c
@@ -41,6 +41,7 @@ struct _NautilusQueryEditor
     GtkWidget parent_instance;
 
     GtkWidget *entry;
+    GtkWidget *clear_icon;
     GtkWidget *popover;
     GtkWidget *dropdown_button;
 
@@ -49,6 +50,7 @@ struct _NautilusQueryEditor
     GdTaggedEntryTag *date_range_tag;
 #endif
 
+    guint search_changed_timeout_id;
     gboolean change_frozen;
 
     GFile *location;
@@ -83,6 +85,8 @@ static void nautilus_query_editor_changed (NautilusQueryEditor *editor);
 
 G_DEFINE_TYPE (NautilusQueryEditor, nautilus_query_editor, GTK_TYPE_WIDGET);
 
+#define SEARCH_CHANGED_TIMEOUT 150
+
 static void
 update_fts_sensitivity (NautilusQueryEditor *editor)
 {
@@ -135,8 +139,12 @@ nautilus_query_editor_dispose (GObject *object)
 
     editor = NAUTILUS_QUERY_EDITOR (object);
 
+    g_clear_handle_id (&editor->search_changed_timeout_id, g_source_remove);
+
+    gtk_widget_unparent (gtk_widget_get_first_child (GTK_WIDGET (editor)));
     g_clear_pointer (&editor->entry, gtk_widget_unparent);
     g_clear_pointer (&editor->dropdown_button, gtk_widget_unparent);
+    g_clear_pointer (&editor->clear_icon, gtk_widget_unparent);
 
     g_clear_object (&editor->location);
     g_clear_object (&editor->query);
@@ -157,7 +165,7 @@ nautilus_query_editor_grab_focus (GtkWidget *widget)
 
     if (gtk_widget_get_visible (widget) && !gtk_widget_is_focus (editor->entry))
     {
-        return gtk_widget_grab_focus (editor->entry);
+        return gtk_text_grab_focus_without_selecting (GTK_TEXT (editor->entry));
     }
 
     return FALSE;
@@ -296,6 +304,10 @@ nautilus_query_editor_class_init (NautilusQueryEditorClass *class)
                                  gtk_signal_action_new ("focus-view"));
     gtk_widget_class_add_shortcut (widget_class, shortcut);
 
+    gtk_widget_class_add_binding_signal (widget_class,
+                                         GDK_KEY_Escape, 0, "cancel",
+                                         NULL);
+
     /**
      * NautilusQueryEditor::location:
      *
@@ -324,6 +336,8 @@ nautilus_query_editor_class_init (NautilusQueryEditorClass *class)
                                                           G_PARAM_READWRITE));
 
     gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
+    gtk_widget_class_set_css_name (widget_class, "entry");
+    gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_TEXT_BOX);
 }
 
 GFile *
@@ -373,14 +387,15 @@ entry_activate_cb (GtkWidget           *entry,
     g_signal_emit (editor, signals[ACTIVATED], 0);
 }
 
-static void
-entry_changed_cb (GtkWidget           *entry,
-                  NautilusQueryEditor *editor)
+static gboolean
+entry_changed_internal (NautilusQueryEditor *editor)
 {
-    if (editor->change_frozen)
-    {
-        return;
-    }
+    const gchar *text = gtk_editable_get_text (GTK_EDITABLE (editor->entry));
+    gboolean is_empty = (text == NULL && *text == '\0');
+
+    editor->search_changed_timeout_id = 0;
+
+    gtk_widget_set_child_visible (editor->clear_icon, !is_empty);
 
     if (editor->query == NULL)
     {
@@ -388,22 +403,28 @@ entry_changed_cb (GtkWidget           *entry,
     }
     else
     {
-        g_autofree gchar *text = NULL;
-
-        text = g_strdup (gtk_editable_get_text (GTK_EDITABLE (editor->entry)));
-        text = g_strstrip (text);
-
-        nautilus_query_set_text (editor->query, text);
+        g_autofree gchar *stripped_text = g_strstrip (g_strdup (text));
+        nautilus_query_set_text (editor->query, stripped_text);
     }
 
     nautilus_query_editor_changed (editor);
+
+    return G_SOURCE_REMOVE;
 }
 
 static void
-nautilus_query_editor_on_stop_search (GtkWidget           *entry,
-                                      NautilusQueryEditor *editor)
+entry_changed_cb (GtkWidget           *entry,
+                  NautilusQueryEditor *editor)
 {
-    g_signal_emit (editor, signals[CANCEL], 0);
+    if (editor->change_frozen)
+    {
+        return;
+    }
+
+    g_clear_handle_id (&editor->search_changed_timeout_id, g_source_remove);
+    editor->search_changed_timeout_id = g_timeout_add (SEARCH_CHANGED_TIMEOUT,
+                                                       G_SOURCE_FUNC (entry_changed_internal),
+                                                       editor);
 }
 
 static void
@@ -557,26 +578,63 @@ entry_tag_close_button_clicked (NautilusQueryEditor *editor,
 }
 #endif
 
+static void
+on_clear_icon_pressed (GtkGestureClick     *gesture,
+                       int                  n_press,
+                       double               x,
+                       double               y,
+                       NautilusQueryEditor *self)
+{
+    gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
+}
+
+static void
+on_clear_icon_released (GtkGestureClick     *gesture,
+                        int                  n_press,
+                        double               x,
+                        double               y,
+                        NautilusQueryEditor *self)
+{
+    gtk_editable_set_text (GTK_EDITABLE (self->entry), "");
+}
+
 static void
 nautilus_query_editor_init (NautilusQueryEditor *editor)
 {
+    gboolean rtl = (gtk_widget_get_direction (GTK_WIDGET (editor)) == GTK_TEXT_DIR_RTL);
+    GtkWidget *image;
+    GtkEventController *controller;
+
+    gtk_widget_set_name (GTK_WIDGET (editor), "NautilusQueryEditor");
+    gtk_widget_add_css_class (GTK_WIDGET (editor), "search");
+
     g_signal_connect (nautilus_preferences,
                       "changed::recursive-search",
                       G_CALLBACK (recursive_search_preferences_changed),
                       editor);
 
-    gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (editor)), "linked");
-
     /* create the search entry */
-#if 0 && TAGGED_ENTRY_NEEDS_GTK4_REIMPLEMENTATION
-    editor->entry = GTK_WIDGET (gd_tagged_entry_new ());
-#else
-    editor->entry = gtk_search_entry_new ();
-#endif
-    gtk_widget_set_hexpand (editor->entry, TRUE);
+    image = gtk_image_new_from_icon_name ("system-search-symbolic");
+    g_object_set (image, "accessible-role", GTK_ACCESSIBLE_ROLE_PRESENTATION, NULL);
+    gtk_widget_set_margin_start (image, 4);
+    gtk_widget_set_parent (image, GTK_WIDGET (editor));
 
+    editor->entry = gtk_text_new ();
+    gtk_widget_set_hexpand (editor->entry, TRUE);
     gtk_widget_set_parent (editor->entry, GTK_WIDGET (editor));
 
+    editor->clear_icon = gtk_image_new_from_icon_name (rtl ? "edit-clear-rtl-symbolic" :
+                                                             "edit-clear-symbolic");
+    g_object_set (editor->clear_icon, "accessible-role", GTK_ACCESSIBLE_ROLE_PRESENTATION, NULL);
+    gtk_widget_set_tooltip_text (editor->clear_icon, _("Clear entry"));
+    gtk_widget_set_child_visible (editor->clear_icon, FALSE);
+    gtk_widget_set_parent (editor->clear_icon, GTK_WIDGET (editor));
+
+    controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
+    g_signal_connect (controller, "pressed", G_CALLBACK (on_clear_icon_pressed), editor);
+    g_signal_connect (controller, "released", G_CALLBACK (on_clear_icon_released), editor);
+    gtk_widget_add_controller (editor->clear_icon, controller);
+
 #if 0 && TAGGED_ENTRY_NEEDS_GTK4_REIMPLEMENTATION
     editor->mime_types_tag = gd_tagged_entry_tag_new (NULL);
     editor->date_range_tag = gd_tagged_entry_tag_new (NULL);
@@ -607,13 +665,12 @@ nautilus_query_editor_init (NautilusQueryEditor *editor)
     editor->dropdown_button = gtk_menu_button_new ();
     gtk_menu_button_set_popover (GTK_MENU_BUTTON (editor->dropdown_button), editor->popover);
     gtk_widget_set_parent (editor->dropdown_button, GTK_WIDGET (editor));
+    gtk_widget_add_css_class (editor->dropdown_button, "circular");
 
     g_signal_connect (editor->entry, "activate",
                       G_CALLBACK (entry_activate_cb), editor);
-    g_signal_connect (editor->entry, "search-changed",
+    g_signal_connect (editor->entry, "changed",
                       G_CALLBACK (entry_changed_cb), editor);
-    g_signal_connect (editor->entry, "stop-search",
-                      G_CALLBACK (nautilus_query_editor_on_stop_search), editor);
     g_signal_connect (editor->popover, "date-range",
                       G_CALLBACK (search_popover_date_range_changed_cb), editor);
     g_signal_connect (editor->popover, "mime-type",
@@ -774,7 +831,6 @@ nautilus_query_editor_handle_event (NautilusQueryEditor   *self,
                                     guint                  keyval,
                                     GdkModifierType        state)
 {
-    GtkWidget *text;
     g_return_val_if_fail (NAUTILUS_IS_QUERY_EDITOR (self), GDK_EVENT_PROPAGATE);
     g_return_val_if_fail (controller != NULL, GDK_EVENT_PROPAGATE);
 
@@ -786,19 +842,5 @@ nautilus_query_editor_handle_event (NautilusQueryEditor   *self,
         return GDK_EVENT_PROPAGATE;
     }
 
-    text = gtk_widget_get_first_child (GTK_WIDGET (self->entry));
-    while (text != NULL)
-    {
-        if (GTK_IS_TEXT (text))
-        {
-            break;
-        }
-        text = gtk_widget_get_next_sibling (text);
-    }
-
-    if (text == NULL)
-    {
-        return FALSE;
-    }
-    return gtk_event_controller_key_forward (controller, text);
+    return gtk_event_controller_key_forward (controller, self->entry);
 }
diff --git a/src/resources/css/Adwaita.css b/src/resources/css/Adwaita.css
index 47110f38e..478bb811d 100644
--- a/src/resources/css/Adwaita.css
+++ b/src/resources/css/Adwaita.css
@@ -78,6 +78,25 @@
   opacity: 1;
 }
 
+/* Search bar */
+
+#NautilusQueryEditor > * {
+  margin-top: 5px;
+  margin-bottom: 5px;
+}
+
+/* Mimic the style of GtkEntry icons, but keep button background if pressed. */
+#NautilusQueryEditor > menubutton > button {
+  min-width: 24px;
+  min-height: 24px;
+}
+#NautilusQueryEditor > menubutton > button:not(:checked) {
+  background: none;
+}
+#NautilusQueryEditor > menubutton > button:not(:hover):not(:checked) {
+  opacity: 0.7;
+}
+
 /* Floating status bar */
 .floating-bar {
   padding: 3px;