1 files changed, 119 insertions, 0 deletions
diff --git a/panels/sound/cc-balance-slider.c b/panels/sound/cc-balance-slider.c
new file mode 100644
index 0000000..7cb8a04
--- /dev/null
+++ b/panels/sound/cc-balance-slider.c
@@ -0,0 +1,119 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2018 Canonical Ltd.
+ *
+ * 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 2 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
+ * Lesser 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/>.
+ */
+
+#include "cc-sound-resources.h"
+#include "cc-balance-slider.h"
+#include "gvc-channel-map-private.h"
+
+struct _CcBalanceSlider
+{
+  GtkBox           parent_instance;
+
+  GtkAdjustment   *adjustment;
+
+  GvcChannelMap   *channel_map;
+  guint            volume_changed_handler_id;
+};
+
+G_DEFINE_TYPE (CcBalanceSlider, cc_balance_slider, GTK_TYPE_BOX)
+
+static void
+changed_cb (CcBalanceSlider *self)
+{
+  gdouble value;
+  const pa_channel_map *pa_map;
+  pa_cvolume pa_volume;
+
+  if (self->channel_map == NULL)
+    return;
+
+  value = gtk_adjustment_get_value (self->adjustment);
+  pa_map = gvc_channel_map_get_pa_channel_map (self->channel_map);
+  pa_volume = *gvc_channel_map_get_cvolume (self->channel_map);
+  pa_cvolume_set_balance (&pa_volume, pa_map, value);
+  gvc_channel_map_volume_changed (self->channel_map, &pa_volume, TRUE);
+}
+
+static void
+volume_changed_cb (CcBalanceSlider *self)
+{
+  const gdouble *volumes;
+
+  volumes = gvc_channel_map_get_volume (self->channel_map);
+  g_signal_handlers_block_by_func (self->adjustment, volume_changed_cb, self);
+  gtk_adjustment_set_value (self->adjustment, volumes[BALANCE]);
+  g_signal_handlers_unblock_by_func (self->adjustment, volume_changed_cb, self);
+}
+
+static void
+cc_balance_slider_dispose (GObject *object)
+{
+  CcBalanceSlider *self = CC_BALANCE_SLIDER (object);
+
+  g_clear_object (&self->channel_map);
+
+  G_OBJECT_CLASS (cc_balance_slider_parent_class)->dispose (object);
+}
+
+void
+cc_balance_slider_class_init (CcBalanceSliderClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->dispose = cc_balance_slider_dispose;
+
+  gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/control-center/sound/cc-balance-slider.ui");
+
+  gtk_widget_class_bind_template_child (widget_class, CcBalanceSlider, adjustment);
+
+  gtk_widget_class_bind_template_callback (widget_class, changed_cb);
+}
+
+void
+cc_balance_slider_init (CcBalanceSlider *self)
+{
+  g_resources_register (cc_sound_get_resource ());
+
+  gtk_widget_init_template (GTK_WIDGET (self));
+}
+
+void
+cc_balance_slider_set_channel_map (CcBalanceSlider *self,
+                                   GvcChannelMap   *channel_map)
+{
+  g_return_if_fail (CC_IS_BALANCE_SLIDER (self));
+
+  if (self->channel_map != NULL)
+    {
+      g_signal_handler_disconnect (self->channel_map, self->volume_changed_handler_id);
+      self->volume_changed_handler_id = 0;
+    }
+  g_clear_object (&self->channel_map);
+
+  if (channel_map != NULL)
+    {
+      self->channel_map = g_object_ref (channel_map);
+
+      self->volume_changed_handler_id = g_signal_connect_object (channel_map,
+                                                                 "volume-changed",
+                                                                 G_CALLBACK (volume_changed_cb),
+                                                                 self, G_CONNECT_SWAPPED);
+      volume_changed_cb (self);
+    }
+}