[sysprof/wip/visualizers] visualizer-view: implement basic panning

[Christian Hergert <chergert src gnome org>]

commit caa95fcca706c212f919d47a94859c27ec48c985
Author: Christian Hergert <chergert redhat com>
Date:   Thu Sep 29 14:37:00 2016 -0700

    visualizer-view: implement basic panning
    
    There are lots of little things that need fixing, such as the
    ticks positioning, and reusing surfaces as much as possible, but
    this gets our "MVP" panning in place.

 lib/resources/ui/sp-visualizer-view.ui |   25 +++++++++++-
 lib/sp-visualizer-view.c               |   66 ++++++++++++++++++++++++++++++--
 2 files changed, 84 insertions(+), 7 deletions(-)
---
diff --git a/lib/resources/ui/sp-visualizer-view.ui b/lib/resources/ui/sp-visualizer-view.ui
index 8dc003b..638174e 100644
--- a/lib/resources/ui/sp-visualizer-view.ui
+++ b/lib/resources/ui/sp-visualizer-view.ui
@@ -12,11 +12,25 @@
           </object>
         </child>
         <child>
-          <object class="GtkScrolledWindow">
+          <object class="GtkBox">
+            <property name="orientation">vertical</property>
             <property name="visible">true</property>
-            <property name="propagate-natural-height">true</property>
             <child>
-              <object class="SpVisualizerList" id="list">
+              <object class="GtkScrolledWindow">
+                <property name="hscrollbar-policy">external</property>
+                <property name="visible">true</property>
+                <property name="propagate-natural-height">true</property>
+                <child>
+                  <object class="SpVisualizerList" id="list">
+                    <property name="visible">true</property>
+                  </object>
+                </child>
+              </object>
+            </child>
+            <child>
+              <object class="GtkScrollbar" id="scrollbar">
+                <property name="adjustment">scroll_adjustment</property>
+                <property name="orientation">horizontal</property>
                 <property name="visible">true</property>
               </object>
             </child>
@@ -25,4 +39,9 @@
       </object>
     </child>
   </template>
+  <object class="GtkAdjustment" id="scroll_adjustment">
+    <property name="lower">0.0</property>
+    <property name="upper">0.0</property>
+    <property name="value">0.0</property>
+  </object>
 </interface>
diff --git a/lib/sp-visualizer-view.c b/lib/sp-visualizer-view.c
index 39f90f3..cb046db 100644
--- a/lib/sp-visualizer-view.c
+++ b/lib/sp-visualizer-view.c
@@ -29,10 +29,11 @@
 typedef struct
 {
   SpCaptureReader   *reader;
+  SpZoomManager     *zoom_manager;
 
   SpVisualizerList  *list;
+  GtkAdjustment     *scroll_adjustment;
   SpVisualizerTicks *ticks;
-  SpZoomManager     *zoom_manager;
 } SpVisualizerViewPrivate;
 
 enum {
@@ -85,6 +86,41 @@ sp_visualizer_view_row_removed (SpVisualizerView *self,
 }
 
 static void
+sp_visualizer_view_set_time_range (SpVisualizerView *self,
+                                   gint64            begin_time,
+                                   gint64            end_time)
+{
+  SpVisualizerViewPrivate *priv = sp_visualizer_view_get_instance_private (self);
+
+  g_assert (SP_IS_VISUALIZER_VIEW (self));
+
+  if (begin_time < end_time)
+    {
+      gint64 tmp = begin_time;
+      begin_time = end_time;
+      end_time = tmp;
+    }
+
+  sp_visualizer_list_set_time_range (priv->list, begin_time, end_time);
+  sp_visualizer_ticks_set_time_range (priv->ticks, begin_time, end_time);
+}
+
+static void
+sp_visualizer_view_adjustment_value_changed (SpVisualizerView *self,
+                                             GtkAdjustment    *adjustment)
+{
+  gint64 begin_time;
+  gint64 end_time;
+
+  g_assert (SP_IS_VISUALIZER_VIEW (self));
+  g_assert (GTK_IS_ADJUSTMENT (adjustment));
+
+  begin_time = gtk_adjustment_get_value (adjustment);
+  end_time = begin_time + gtk_adjustment_get_page_size (adjustment);
+  sp_visualizer_view_set_time_range (self, begin_time, end_time);
+}
+
+static void
 sp_visualizer_view_notify_zoom (SpVisualizerView *self,
                                 GParamSpec       *pspec,
                                 SpZoomManager    *zoom_manager)
@@ -104,8 +140,8 @@ sp_visualizer_view_notify_zoom (SpVisualizerView *self,
 
   end_time = begin_time + (NSEC_PER_SEC * 60.0 / zoom);
 
-  sp_visualizer_list_set_time_range (priv->list, begin_time, end_time);
-  sp_visualizer_ticks_set_time_range (priv->ticks, begin_time, end_time);
+  sp_visualizer_view_set_time_range (self, begin_time, end_time);
+  gtk_adjustment_set_page_size (priv->scroll_adjustment, end_time - begin_time);
 }
 
 static void
@@ -210,6 +246,7 @@ sp_visualizer_view_class_init (SpVisualizerViewClass *klass)
 
   gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/sysprof/ui/sp-visualizer-view.ui");
   gtk_widget_class_bind_template_child_private (widget_class, SpVisualizerView, list);
+  gtk_widget_class_bind_template_child_private (widget_class, SpVisualizerView, scroll_adjustment);
   gtk_widget_class_bind_template_child_private (widget_class, SpVisualizerView, ticks);
 
   gtk_widget_class_set_css_name (widget_class, "visualizers");
@@ -233,6 +270,12 @@ sp_visualizer_view_init (SpVisualizerView *self)
                            G_CALLBACK (sp_visualizer_view_row_removed),
                            self,
                            G_CONNECT_SWAPPED);
+
+  g_signal_connect_object (priv->scroll_adjustment,
+                           "value-changed",
+                           G_CALLBACK (sp_visualizer_view_adjustment_value_changed),
+                           self,
+                           G_CONNECT_SWAPPED);
 }
 
 /**
@@ -261,9 +304,24 @@ sp_visualizer_view_set_reader (SpVisualizerView *self,
   if (priv->reader != reader)
     {
       g_clear_pointer (&priv->reader, sp_capture_reader_unref);
-      priv->reader = sp_capture_reader_ref (reader);
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_READER]);
       sp_visualizer_list_set_reader (priv->list, reader);
+      if (reader != NULL)
+        {
+          gint64 begin_time = 0;
+          gint64 end_time = 0;
+
+          priv->reader = sp_capture_reader_ref (reader);
+          begin_time = sp_capture_reader_get_start_time (reader);
+          end_time = sp_capture_reader_get_end_time (reader);
+
+          g_object_set (priv->scroll_adjustment,
+                        "lower", (gdouble)begin_time,
+                        "upper", (gdouble)end_time,
+                        "value", (gdouble)begin_time,
+                        NULL);
+        }
+
       if (priv->zoom_manager != NULL)
         sp_visualizer_view_notify_zoom (self, NULL, priv->zoom_manager);
     }