libsysprof-gtk: start on new axis/series design

This will mean we move series work from libsysprof-analyze into
libsysprof-gtk so we get access to things like GtkExpression.

src/libsysprof-gtk/sysprof-axis.c

@@ -0,0 +1,160 @@
+/* sysprof-axis.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 <math.h>
+
+#include "sysprof-axis-private.h"
+
+enum {
+  PROP_0,
+  PROP_TITLE,
+  N_PROPS
+};
+
+enum {
+  RANGE_CHANGED,
+  N_SIGNALS
+};
+
+G_DEFINE_ABSTRACT_TYPE (SysprofAxis, sysprof_axis, G_TYPE_OBJECT)
+
+static GParamSpec *properties[N_PROPS];
+static guint signals[N_SIGNALS];
+
+static double
+sysprof_axis_real_normalize (SysprofAxis  *axis,
+                             const GValue *value)
+{
+  return -INFINITY;
+}
+
+static void
+sysprof_axis_finalize (GObject *object)
+{
+  SysprofAxis *self = (SysprofAxis *)object;
+
+  g_clear_pointer (&self->title, g_free);
+
+  G_OBJECT_CLASS (sysprof_axis_parent_class)->finalize (object);
+}
+
+static void
+sysprof_axis_get_property (GObject    *object,
+                           guint       prop_id,
+                           GValue     *value,
+                           GParamSpec *pspec)
+{
+  SysprofAxis *self = SYSPROF_AXIS (object);
+
+  switch (prop_id)
+    {
+    case PROP_TITLE:
+      g_value_set_string (value, sysprof_axis_get_title (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_axis_set_property (GObject      *object,
+                           guint         prop_id,
+                           const GValue *value,
+                           GParamSpec   *pspec)
+{
+  SysprofAxis *self = SYSPROF_AXIS (object);
+
+  switch (prop_id)
+    {
+    case PROP_TITLE:
+      sysprof_axis_set_title (self, g_value_get_string (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_axis_class_init (SysprofAxisClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = sysprof_axis_finalize;
+  object_class->get_property = sysprof_axis_get_property;
+  object_class->set_property = sysprof_axis_set_property;
+
+  klass->normalize = sysprof_axis_real_normalize;
+
+  properties [PROP_TITLE] =
+    g_param_spec_string ("title", NULL, NULL,
+                         NULL,
+                         (G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, N_PROPS, properties);
+
+  /**
+   * SysprofAxis::range-changed:
+   *
+   * This signal is emitted when the range of the axis has changed.
+   */
+  signals[RANGE_CHANGED] =
+    g_signal_new ("range-changed",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  NULL,
+                  G_TYPE_NONE, 0);
+}
+
+static void
+sysprof_axis_init (SysprofAxis *self)
+{
+}
+
+const char *
+sysprof_axis_get_title (SysprofAxis *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_AXIS (self), NULL);
+
+  return self->title;
+}
+
+void
+sysprof_axis_set_title (SysprofAxis *self,
+                        const char  *title)
+{
+  g_return_if_fail (SYSPROF_IS_AXIS (self));
+
+  if (g_set_str (&self->title, title))
+    g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_TITLE]);
+}
+
+void
+_charts_axis_emit_range_changed (SysprofAxis *self)
+{
+  g_return_if_fail (SYSPROF_IS_AXIS (self));
+
+  g_signal_emit (self, signals[RANGE_CHANGED], 0);
+}