[gnome-builder] build-panel: add empty state view for build panel

[Christian Hergert <chergert src gnome org>]

commit b14a020b669dbeeea9e4c13aa2c0124e2f29d537
Author: Christian Hergert <chergert redhat com>
Date:   Mon Oct 17 17:02:38 2016 -0700

    build-panel: add empty state view for build panel
    
    This panel does not really indicate what it does when a build has not yet
    been performed. So this gives a handy empty state message and action link
    to submit a build of the project.

 plugins/build-tools/gbp-build-panel.c  |    5 +++
 plugins/build-tools/gbp-build-panel.ui |   52 +++++++++++++++++++++----------
 2 files changed, 40 insertions(+), 17 deletions(-)
---
diff --git a/plugins/build-tools/gbp-build-panel.c b/plugins/build-tools/gbp-build-panel.c
index cde0c92..ba22ce4 100644
--- a/plugins/build-tools/gbp-build-panel.c
+++ b/plugins/build-tools/gbp-build-panel.c
@@ -39,6 +39,7 @@ struct _GbpBuildPanel
   GtkTreeView         *diagnostics_tree_view;
   GtkLabel            *errors_label;
   GtkLabel            *running_time_label;
+  GtkStack            *stack;
   GtkRevealer         *status_revealer;
   GtkLabel            *status_label;
   GtkLabel            *warnings_label;
@@ -187,6 +188,8 @@ gbp_build_panel_connect (GbpBuildPanel  *self,
   egg_binding_group_set_source (self->bindings, result);
 
   gtk_revealer_set_reveal_child (self->status_revealer, TRUE);
+
+  gtk_stack_set_visible_child_name (self->stack, "diagnostics");
 }
 
 static void
@@ -201,6 +204,7 @@ gbp_build_panel_disconnect (GbpBuildPanel *self)
   g_clear_object (&self->result);
   g_hash_table_remove_all (self->diags_hash);
   gtk_list_store_clear (self->diagnostics_store);
+  gtk_stack_set_visible_child_name (self->stack, "empty-state");
 }
 
 void
@@ -430,6 +434,7 @@ gbp_build_panel_class_init (GbpBuildPanelClass *klass)
   gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, diagnostics_tree_view);
   gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, errors_label);
   gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, running_time_label);
+  gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, stack);
   gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, status_label);
   gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, status_revealer);
   gtk_widget_class_bind_template_child (widget_class, GbpBuildPanel, warnings_label);
diff --git a/plugins/build-tools/gbp-build-panel.ui b/plugins/build-tools/gbp-build-panel.ui
index 8f3a1da..a2d3662 100644
--- a/plugins/build-tools/gbp-build-panel.ui
+++ b/plugins/build-tools/gbp-build-panel.ui
@@ -138,33 +138,51 @@
           </object>
         </child>
         <child>
-          <object class="GtkScrolledWindow">
-            <property name="hscrollbar-policy">never</property>
-            <property name="vexpand">true</property>
+          <object class="GtkStack" id="stack">
             <property name="visible">true</property>
             <child>
-              <object class="GtkTreeView" id="diagnostics_tree_view">
-                <property name="activate-on-single-click">true</property>
-                <property name="tooltip-column">1</property>
-                <property name="model">diagnostics_store</property>
-                <property name="headers-visible">false</property>
+              <object class="EggEmptyState">
+                <property name="icon-name">builder-build-symbolic</property>
+                <property name="subtitle" translatable="yes" comments="the action:// link is used to execute 
a build">&lt;a href="action://build-manager.build"&gt;Build your project&lt;/a&gt; to show diagnostics 
here</property>
+                <property name="visible">true</property>
+              </object>
+              <packing>
+                <property name="name">empty-state</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkScrolledWindow">
+                <property name="hscrollbar-policy">never</property>
+                <property name="vexpand">true</property>
                 <property name="visible">true</property>
                 <child>
-                  <object class="GtkTreeViewColumn" id="diagnostics_column">
-                    <property name="expand">true</property>
+                  <object class="GtkTreeView" id="diagnostics_tree_view">
+                    <property name="activate-on-single-click">true</property>
+                    <property name="tooltip-column">1</property>
+                    <property name="model">diagnostics_store</property>
+                    <property name="headers-visible">false</property>
+                    <property name="visible">true</property>
                     <child>
-                      <object class="GtkCellRendererText" id="diagnostics_text">
-                        <property name="yalign">0.0</property>
-                        <property name="xalign">0.0</property>
-                        <property name="ypad">6</property>
-                        <property name="width-chars">0</property>
-                        <property name="ellipsize">end</property>
-                        <property name="wrap-mode">word-char</property>
+                      <object class="GtkTreeViewColumn" id="diagnostics_column">
+                        <property name="expand">true</property>
+                        <child>
+                          <object class="GtkCellRendererText" id="diagnostics_text">
+                            <property name="yalign">0.0</property>
+                            <property name="xalign">0.0</property>
+                            <property name="ypad">6</property>
+                            <property name="width-chars">0</property>
+                            <property name="ellipsize">end</property>
+                            <property name="wrap-mode">word-char</property>
+                          </object>
+                        </child>
                       </object>
                     </child>
                   </object>
                 </child>
               </object>
+              <packing>
+                <property name="name">diagnostics</property>
+              </packing>
             </child>
           </object>
         </child>