searchbar: reorganize

Avoid the ugly priv->tool_box==NULL check in ::add (and ::remove) by
just not using template xml for this small class. Also, make sure the
GtkBin child is properly set and implement remove to also properly
remove it. Remove the manual widget margins and add some CSS for it.
Also switch to simply using a GtkCenterBox.

gtk/gtksearchbar.c

@@ -28,6 +28,9 @@
 #include "config.h"
 
 #include "gtkentry.h"
+#include "gtkbox.h"
+#include "gtkcenterbox.h"
+#include "gtkbutton.h"
 #include "gtkentryprivate.h"
 #include "gtkintl.h"
 #include "gtkprivate.h"
@@ -58,7 +61,18 @@
  *
  * # CSS nodes
  *
- * GtkSearchBar has a single CSS node with name searchbar.
+ * |[<!-- language="plain" -->
+ * searchbar
+ * ╰── revealer
+ *     ╰── box
+ *          ├── [child]
+ *          ╰── [button.close]
+ * ]|
+ *
+ * GtkSearchBar has a main CSS node with name searchbar. It has a child node
+ * with name revealer that contains a node with name box. The box node contains both the
+ * CSS node of the child widget as well as an optional button node which gets the .close
+ * style class applied.
  *
  * ## Creating a search bar
  *
@@ -68,9 +82,7 @@
  */
 
 typedef struct {
-  /* Template widgets */
   GtkWidget   *revealer;
-  GtkWidget   *tool_box;
   GtkWidget   *box_center;
   GtkWidget   *close_button;
 
@@ -252,8 +264,6 @@ reveal_child_changed_cb (GObject      *object,
   gboolean reveal_child;
 
   g_object_get (object, "reveal-child", &reveal_child, NULL);
-  if (reveal_child)
-    gtk_widget_set_child_visible (priv->revealer, TRUE);
 
   if (reveal_child == priv->reveal_child)
     return;
@@ -271,19 +281,6 @@ reveal_child_changed_cb (GObject      *object,
   g_object_notify (G_OBJECT (bar), "search-mode-enabled");
 }
 
-static void
-child_revealed_changed_cb (GObject      *object,
-                           GParamSpec   *pspec,
-                           GtkSearchBar *bar)
-{
-  GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
-  gboolean val;
-
-  g_object_get (object, "child-revealed", &val, NULL);
-  if (!val)
-    gtk_widget_set_child_visible (priv->revealer, FALSE);
-}
-
 static void
 close_button_clicked_cb (GtkWidget    *button,
                          GtkSearchBar *bar)
@@ -300,24 +297,14 @@ gtk_search_bar_add (GtkContainer *container,
   GtkSearchBar *bar = GTK_SEARCH_BAR (container);
   GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
 
-  /* When constructing the widget, we want the revealer to be added
-   * as the first child of the search bar, as an implementation detail.
-   * After that, the child added by the application should be added
-   * to box_center.
+  gtk_center_box_set_center_widget (GTK_CENTER_BOX (priv->box_center), child);
+  /* If an entry is the only child, save the developer a couple of
+   * lines of code
    */
-  if (priv->box_center == NULL)
-    {
-      GTK_CONTAINER_CLASS (gtk_search_bar_parent_class)->add (container, child);
-    }
-  else
-    {
-      gtk_container_add (GTK_CONTAINER (priv->box_center), child);
-      /* If an entry is the only child, save the developer a couple of
-       * lines of code
-       */
-      if (GTK_IS_ENTRY (child))
-        gtk_search_bar_connect_entry (bar, GTK_ENTRY (child));
-    }
+  if (GTK_IS_ENTRY (child))
+    gtk_search_bar_connect_entry (bar, GTK_ENTRY (child));
+
+  _gtk_bin_set_child (GTK_BIN (container), child);
 }
 
 static void
@@ -327,14 +314,11 @@ gtk_search_bar_remove (GtkContainer *container,
   GtkSearchBar *bar = GTK_SEARCH_BAR (container);
   GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
 
-  if (priv->box_center == NULL)
-    {
-      GTK_CONTAINER_CLASS (gtk_search_bar_parent_class)->remove (container, child);
-    }
-  else
-    {
-      gtk_container_remove (GTK_CONTAINER (priv->box_center), child);
-    }
+  if (GTK_IS_ENTRY (child))
+    gtk_search_bar_connect_entry (bar, NULL);
+
+  gtk_center_box_set_center_widget (GTK_CENTER_BOX (priv->box_center), NULL);
+  _gtk_bin_set_child (GTK_BIN (container), NULL);
 }
 
 static void
@@ -389,12 +373,52 @@ static void
 gtk_search_bar_dispose (GObject *object)
 {
   GtkSearchBar *bar = GTK_SEARCH_BAR (object);
+  GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
+
+  if (gtk_bin_get_child (GTK_BIN (bar)) != NULL)
+    {
+      gtk_center_box_set_center_widget (GTK_CENTER_BOX (priv->box_center), NULL);
+      _gtk_bin_set_child (GTK_BIN (bar), NULL);
+    }
+
+  if (priv->revealer != NULL)
+    {
+      gtk_widget_unparent (priv->revealer);
+      priv->revealer = NULL;
+    }
 
   gtk_search_bar_set_entry (bar, NULL);
 
   G_OBJECT_CLASS (gtk_search_bar_parent_class)->dispose (object);
 }
 
+static void
+gtk_search_bar_measure (GtkWidget      *widget,
+                        GtkOrientation  orientation,
+                        int             for_size,
+                        int            *minimum,
+                        int            *natural,
+                        int            *minimum_baseline,
+                        int            *natural_baseline)
+{
+  GtkSearchBar *bar = GTK_SEARCH_BAR (widget);
+  GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
+
+  gtk_widget_measure (priv->revealer, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline);
+}
+
+static void
+gtk_search_bar_size_allocate (GtkWidget           *widget,
+                              const GtkAllocation *allocation,
+                              int                  baseline,
+                              GtkAllocation       *out_clip)
+{
+  GtkSearchBar *bar = GTK_SEARCH_BAR (widget);
+  GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
+
+  gtk_widget_size_allocate (priv->revealer, allocation, baseline, out_clip);
+}
+
 static void
 gtk_search_bar_class_init (GtkSearchBarClass *klass)
 {
@@ -406,6 +430,9 @@ gtk_search_bar_class_init (GtkSearchBarClass *klass)
   object_class->set_property = gtk_search_bar_set_property;
   object_class->get_property = gtk_search_bar_get_property;
 
+  widget_class->measure = gtk_search_bar_measure;
+  widget_class->size_allocate = gtk_search_bar_size_allocate;
+
   container_class->add = gtk_search_bar_add;
   container_class->remove = gtk_search_bar_remove;
 
@@ -435,12 +462,6 @@ gtk_search_bar_class_init (GtkSearchBarClass *klass)
 
   g_object_class_install_properties (object_class, LAST_PROPERTY, widget_props);
 
-  gtk_widget_class_set_template_from_resource (widget_class, "/org/gtk/libgtk/ui/gtksearchbar.ui");
-  gtk_widget_class_bind_template_child_private (widget_class, GtkSearchBar, tool_box);
-  gtk_widget_class_bind_template_child_private (widget_class, GtkSearchBar, revealer);
-  gtk_widget_class_bind_template_child_private (widget_class, GtkSearchBar, box_center);
-  gtk_widget_class_bind_template_child_private (widget_class, GtkSearchBar, close_button);
-
   gtk_widget_class_set_css_name (widget_class, I_("searchbar"));
 }
 
@@ -449,21 +470,28 @@ gtk_search_bar_init (GtkSearchBar *bar)
 {
   GtkSearchBarPrivate *priv = gtk_search_bar_get_instance_private (bar);
 
-  gtk_widget_init_template (GTK_WIDGET (bar));
+  priv->revealer = gtk_revealer_new ();
+  gtk_revealer_set_reveal_child (GTK_REVEALER (priv->revealer), FALSE);
+  gtk_widget_set_hexpand (priv->revealer, TRUE);
+  gtk_widget_set_parent (priv->revealer, GTK_WIDGET (bar));
+
+  priv->box_center = gtk_center_box_new ();
+  gtk_widget_set_hexpand (priv->box_center, TRUE);
+
+  priv->close_button = gtk_button_new_from_icon_name ("window-close-symbolic");
+  gtk_style_context_add_class (gtk_widget_get_style_context (priv->close_button), "close");
+  gtk_center_box_set_end_widget (GTK_CENTER_BOX (priv->box_center), priv->close_button);
+  gtk_widget_hide (priv->close_button);
+
+  gtk_container_add (GTK_CONTAINER (priv->revealer), priv->box_center);
 
-  /* We use child-visible to avoid the unexpanded revealer
-   * peaking out by 1 pixel
-   */
-  gtk_widget_set_child_visible (priv->revealer, FALSE);
 
   g_signal_connect (priv->revealer, "notify::reveal-child",
                     G_CALLBACK (reveal_child_changed_cb), bar);
-  g_signal_connect (priv->revealer, "notify::child-revealed",
-                    G_CALLBACK (child_revealed_changed_cb), bar);
 
   g_signal_connect (priv->close_button, "clicked",
                     G_CALLBACK (close_button_clicked_cb), bar);
-};
+}
 
 /**
  * gtk_search_bar_new:

gtk/theme/Adwaita/_common.scss

@@ -1404,6 +1404,13 @@ searchbar,
   padding: 0px;
 }
 
+searchbar {
+  padding: 0px;
+  >revealer>box {
+    padding: 6px;
+  }
+}
+
 %darkbar {
   border-style: solid;
   border-color: $borders_color;

gtk/theme/Adwaita/gtk-contained-dark.css

@@ -585,6 +585,8 @@ toolbar:not(.inline-toolbar):not(.osd) switch, toolbar:not(.inline-toolbar):not(
 
 searchbar, .location-bar { border-width: 0 0 1px; padding: 0px; }
 
+searchbar > revealer > box { padding: 6px; }
+
 .inline-toolbar, searchbar, .location-bar { border-style: solid; border-color: #1b1f20; background-color: #2c3133; }
 
 .inline-toolbar:backdrop, searchbar:backdrop, .location-bar:backdrop { border-color: #202425; background-color: #2c3233; box-shadow: none; transition: 200ms ease-out; }

gtk/theme/Adwaita/gtk-contained.css

@@ -593,6 +593,8 @@ toolbar:not(.inline-toolbar):not(.osd) switch, toolbar:not(.inline-toolbar):not(
 
 searchbar, .location-bar { border-width: 0 0 1px; padding: 0px; }
 
+searchbar > revealer > box { padding: 6px; }
+
 .inline-toolbar, searchbar, .location-bar { border-style: solid; border-color: #b6b6b3; background-color: #d9d9d7; }
 
 .inline-toolbar:backdrop, searchbar:backdrop, .location-bar:backdrop { border-color: #c0c0bd; background-color: #dadad8; box-shadow: none; transition: 200ms ease-out; }

gtk/ui/gtksearchbar.ui

@@ -1,41 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<interface domain="gtk40">
-  <!-- interface-requires gtk+ 3.10 -->
-  <template class="GtkSearchBar" parent="GtkBin">
-    <child>
-      <object class="GtkRevealer" id="revealer">
-        <property name="hexpand">1</property>
-        <child>
-          <object class="GtkBox" id="tool_box">
-            <property name="spacing">6</property>
-            <child>
-              <object class="GtkBox" id="box_center">
-                <property name="halign">center</property>
-                <property name="orientation">vertical</property>
-                <property name="hexpand">1</property>
-              </object>
-              <packing>
-                <property name="position">1</property>
-              </packing>
-            </child>
-            <child>
-              <object class="GtkButton" id="close_button">
-                <property name="visible">0</property>
-                <property name="can-focus">1</property>
-                <property name="receives-default">1</property>
-                <property name="relief">none</property>
-                <property name="icon-name">window-close-symbolic</property>
-                <style>
-                  <class name="close"/>
-                </style>
-              </object>
-              <packing>
-                <property name="position">2</property>
-              </packing>
-            </child>
-          </object>
-        </child>
-      </object>
-    </child>
-  </template>
-</interface>