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/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]);
+}