libsysprof-gtk: add specialized symbol label for descendants

This allows us to provide a bit more context to things in the descendants
callgraph based on the symbol. Context switches get specialized highlight
as well as All Processes and Processes nodes.

src/libsysprof-gtk/meson.build

@@ -6,6 +6,7 @@ libsysprof_gtk_public_sources = [
 libsysprof_gtk_private_sources = [
   'sysprof-css.c',
   'sysprof-progress-cell.c',
+  'sysprof-symbol-label.c',
 ]
 
 libsysprof_gtk_public_headers = [

src/libsysprof-gtk/style.css

@@ -30,5 +30,33 @@ progresscell label.in-progress {
  color: @accent_fg_color;
 }
 
+callgraphview {
+  font-size: .9em;
+}
+
 callgraphview treeexpander indent { -gtk-icon-size: 8px; }
 callgraphview treeexpander indent:nth-child(n+20) { -gtk-icon-size: 0px; }
+
+callgraphview symbol {
+  margin: -1px -3px;
+  padding: 1px 6px;
+}
+callgraphview symbol.context-switch,
+callgraphview symbol.process,
+callgraphview symbol.root,
+callgraphview symbol.unwindable {
+  font-weight: 600;
+}
+callgraphview row:not(:selected) treeexpander expander:checked+box symbol.process,
+callgraphview row:not(:selected) treeexpander expander:checked+box symbol.root {
+  border-radius: 9999px;
+  background-color: alpha(currentColor, .05);
+}
+callgraphview row:not(:selected) treeexpander symbol.context-switch {
+  border-radius: 9999px;
+  background-color: alpha(@warning_color, .1);
+}
+callgraphview row:not(:selected) treeexpander symbol.unwindable {
+  border-radius: 9999px;
+  background-color: alpha(@error_color, .1);
+}

src/libsysprof-gtk/sysprof-callgraph-view.c

@@ -25,6 +25,7 @@
 #include "libsysprof-gtk-resources.h"
 
 #include "sysprof-callgraph-view-private.h"
+#include "sysprof-symbol-label-private.h"
 
 enum {
   PROP_0,
@@ -427,6 +428,7 @@ sysprof_callgraph_view_class_init (SysprofCallgraphViewClass *klass)
   g_resources_register (libsysprof_gtk_get_resource ());
 
   g_type_ensure (PANEL_TYPE_PANED);
+  g_type_ensure (SYSPROF_TYPE_SYMBOL_LABEL);
 }
 
 static void

src/libsysprof-gtk/sysprof-callgraph-view.ui

@@ -177,15 +177,11 @@
               </lookup>
             </binding>
             <child>
-              <object class="GtkInscription">
-                <property name="xalign">0</property>
+              <object class="SysprofSymbolLabel">
                 <property name="hexpand">true</property>
-                <property name="min-chars">25</property>
-                <binding name="text">
-                  <lookup name="name" type="SysprofSymbol">
-                    <lookup name="symbol" type="SysprofCallgraphFrame">
-                      <lookup name="item">expander</lookup>
-                    </lookup>
+                <binding name="symbol">
+                  <lookup name="symbol" type="SysprofCallgraphFrame">
+                    <lookup name="item">expander</lookup>
                   </lookup>
                 </binding>
               </object>

src/libsysprof-gtk/sysprof-symbol-label-private.h

@@ -0,0 +1,38 @@
+/* sysprof-symbol-label-private.h
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include <sysprof-analyze.h>
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_SYMBOL_LABEL (sysprof_symbol_label_get_type())
+
+G_DECLARE_FINAL_TYPE (SysprofSymbolLabel, sysprof_symbol_label, SYSPROF, SYMBOL_LABEL, GtkWidget)
+
+GtkWidget     *sysprof_symbol_label_new        (void);
+SysprofSymbol *sysprof_symbol_label_get_symbol (SysprofSymbolLabel *self);
+void           sysprof_symbol_label_set_symbol (SysprofSymbolLabel *self,
+                                                SysprofSymbol      *symbol);
+
+G_END_DECLS

src/libsysprof-gtk/sysprof-symbol-label.c

@@ -0,0 +1,196 @@
+/* sysprof-symbol-label.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-symbol-label-private.h"
+
+#include "sysprof-symbol-private.h"
+
+#define CSS_CLASS_PROCESS        "process"
+#define CSS_CLASS_ROOT           "root"
+#define CSS_CLASS_CONTEXT_SWITCH "context-switch"
+
+struct _SysprofSymbolLabel
+{
+  GtkWidget parent_instance;
+  GtkWidget *text;
+  SysprofSymbol *symbol;
+};
+
+enum {
+  PROP_0,
+  PROP_SYMBOL,
+  N_PROPS
+};
+
+G_DEFINE_FINAL_TYPE (SysprofSymbolLabel, sysprof_symbol_label, GTK_TYPE_WIDGET)
+
+static GParamSpec *properties [N_PROPS];
+static const char *kind_classes[] = {
+  NULL,
+  "root",
+  "process",
+  "context-switch",
+  "user",
+  "kernel",
+  "unwindable",
+};
+
+static void
+sysprof_symbol_label_dispose (GObject *object)
+{
+  SysprofSymbolLabel *self = (SysprofSymbolLabel *)object;
+
+  g_clear_pointer (&self->text, gtk_widget_unparent);
+  g_clear_object (&self->symbol);
+
+  G_OBJECT_CLASS (sysprof_symbol_label_parent_class)->dispose (object);
+}
+
+static void
+sysprof_symbol_label_get_property (GObject    *object,
+                                   guint       prop_id,
+                                   GValue     *value,
+                                   GParamSpec *pspec)
+{
+  SysprofSymbolLabel *self = SYSPROF_SYMBOL_LABEL (object);
+
+  switch (prop_id)
+    {
+    case PROP_SYMBOL:
+      g_value_set_object (value, sysprof_symbol_label_get_symbol (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_symbol_label_set_property (GObject      *object,
+                                   guint         prop_id,
+                                   const GValue *value,
+                                   GParamSpec   *pspec)
+{
+  SysprofSymbolLabel *self = SYSPROF_SYMBOL_LABEL (object);
+
+  switch (prop_id)
+    {
+    case PROP_SYMBOL:
+      sysprof_symbol_label_set_symbol (self, g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_symbol_label_class_init (SysprofSymbolLabelClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->dispose = sysprof_symbol_label_dispose;
+  object_class->get_property = sysprof_symbol_label_get_property;
+  object_class->set_property = sysprof_symbol_label_set_property;
+
+  properties [PROP_SYMBOL] =
+    g_param_spec_object ("symbol", NULL, NULL,
+                         SYSPROF_TYPE_SYMBOL,
+                         (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, N_PROPS, properties);
+
+  gtk_widget_class_set_css_name (widget_class, "symbol");
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
+}
+
+static void
+sysprof_symbol_label_init (SysprofSymbolLabel *self)
+{
+  self->text = g_object_new (GTK_TYPE_INSCRIPTION,
+                             "xalign", .0f,
+                             "text-overflow", GTK_INSCRIPTION_OVERFLOW_CLIP,
+                             NULL);
+  gtk_widget_set_parent (GTK_WIDGET (self->text), GTK_WIDGET (self));
+}
+
+GtkWidget *
+sysprof_symbol_label_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_SYMBOL_LABEL, NULL);
+}
+
+/**
+ * sysprof_symbol_label_get_label:
+ * @self: a #SysprofSymbolLabel
+ *
+ * Returns: (transfer none) (nullable): a #SysprofSymbol
+ */
+SysprofSymbol *
+sysprof_symbol_label_get_symbol (SysprofSymbolLabel *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_SYMBOL_LABEL (self), NULL);
+
+  return self->symbol;
+}
+
+void
+sysprof_symbol_label_set_symbol (SysprofSymbolLabel *self,
+                                 SysprofSymbol      *symbol)
+{
+  SysprofSymbolKind old_kind;
+  SysprofSymbolKind new_kind;
+  const char *name;
+
+  g_return_if_fail (SYSPROF_IS_SYMBOL_LABEL (self));
+  g_return_if_fail (!symbol || SYSPROF_IS_SYMBOL (symbol));
+
+  if (self->symbol == symbol)
+    return;
+
+  if (self->symbol && symbol && _sysprof_symbol_equal (self->symbol, symbol))
+    return;
+
+  old_kind = sysprof_symbol_get_kind (self->symbol);
+  new_kind = sysprof_symbol_get_kind (symbol);
+
+  g_set_object (&self->symbol, symbol);
+
+  if (old_kind != new_kind)
+    {
+      if (old_kind > 0)
+        gtk_widget_remove_css_class (GTK_WIDGET (self), kind_classes[old_kind]);
+
+      if (new_kind > 0)
+        gtk_widget_add_css_class (GTK_WIDGET (self), kind_classes[new_kind]);
+    }
+
+  if (symbol != NULL)
+    name = sysprof_symbol_get_name (symbol);
+  else
+    name = NULL;
+
+  gtk_inscription_set_text (GTK_INSCRIPTION (self->text), name);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SYMBOL]);
+}