[gnome-boxes/wip/rishi/rhel: 2/9] wizard, wizard-source: Use the headerbar to go back from "Enter URL"

[Debarshi Ray <debarshir src gnome org>]

commit 76e6ed1bfc9d4be7f9483eaddb0cc930cf62da6f
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Aug 23 18:35:10 2017 +0200

    wizard, wizard-source: Use the headerbar to go back from "Enter URL"
    
    This makes the "Enter URL" page visually consistent with the others,
    and enables the alt+<left> keyboard shortcut.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786689

 data/ui/wizard-source.ui |   42 ------------------------------------------
 src/wizard-source.vala   |   13 ++++++-------
 src/wizard.vala          |   20 +++++++++++++++-----
 3 files changed, 21 insertions(+), 54 deletions(-)
---
diff --git a/data/ui/wizard-source.ui b/data/ui/wizard-source.ui
index d85376c..4664fe7 100644
--- a/data/ui/wizard-source.ui
+++ b/data/ui/wizard-source.ui
@@ -202,48 +202,6 @@
           <class name="boxes-menu"/>
         </style>
         <child>
-          <object class="GtkButton" id="url_back_button">
-          <property name="visible">True</property>
-            <signal name="clicked" handler="on_url_back_button_clicked"/>
-            <style>
-              <class name="boxes-menu-row"/>
-            </style>
-            <child>
-              <object class="GtkBox" id="url_back_box">
-                <property name="visible">True</property>
-                <property name="margin-top">10</property>
-                <property name="margin-bottom">10</property>
-                <property name="margin-start">20</property>
-                <property name="margin-end">20</property>
-                <property name="spacing">20</property>
-                <property name="orientation">horizontal</property>
-                <child>
-                  <object class="GtkLabel" id="enter_url_back_label">
-                    <property name="visible">True</property>
-                    <property name="label" translatable="yes">◀</property>
-                  </object>
-                  <packing>
-                    <property name="expand">False</property>
-                    <property name="fill">False</property>
-                  </packing>
-                </child>
-                <child>
-                  <object class="GtkLabel" id="enter_url_label2">
-                    <property name="visible">True</property>
-                    <property name="halign">start</property>
-                    <property name="label" translatable="yes">Enter URL</property>
-                  </object>
-                  <packing>
-                    <property name="expand">True</property>
-                    <property name="fill">True</property>
-                  </packing>
-                </child>
-              </object>
-            </child>
-          </object>
-        </child>
-
-        <child>
           <object class="GtkBox" id="url_entry_vbox">
             <property name="visible">True</property>
             <property name="orientation">vertical</property>
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index eb99882..4f7613d 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -126,6 +126,8 @@ private class Boxes.WizardSource: Gtk.Stack {
 
     private AppWindow window;
 
+    private weak Wizard wizard;
+
     private Gtk.Box media_vbox;
 
     public MediaManager media_manager;
@@ -145,6 +147,7 @@ private class Boxes.WizardSource: Gtk.Stack {
         set {
             _page = value;
 
+            wizard.update_back_button_sensitivity ();
             visible_child_name = page_names[value];
 
             if (selected != null)
@@ -177,10 +180,12 @@ private class Boxes.WizardSource: Gtk.Stack {
         transition_type = Gtk.StackTransitionType.SLIDE_LEFT_RIGHT; // FIXME: Why this won't work from .ui 
file?
     }
 
-    public void setup_ui (AppWindow window) {
+    public void setup_ui (AppWindow window, WizardWindow wizard_window) {
         assert (window != null);
+        assert (wizard_window != null);
 
         this.window = window;
+        wizard = wizard_window.wizard;
 
         var os_db = media_manager.os_db;
         os_db.get_all_media_urls_as_store.begin ((db, result) => {
@@ -223,12 +228,6 @@ private class Boxes.WizardSource: Gtk.Stack {
         activated ();
     }
 
-    [GtkCallback]
-    private void on_url_back_button_clicked () {
-        selected = null;
-        page = SourcePage.MAIN;
-    }
-
     private async void add_media_entries () {
         var medias = yield media_manager.list_installer_medias ();
 
diff --git a/src/wizard.vala b/src/wizard.vala
index 16879ad..069004c 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -132,7 +132,7 @@ private class Boxes.Wizard: Gtk.Stack, Boxes.UI {
                 return;
 
             _page = value;
-            back_button.sensitive = (value != WizardPage.SOURCE);
+            update_back_button_sensitivity ();
             wizard_window.topbar.set_title_for_page (value);
             visible_child_name = page_names[value];
 
@@ -629,9 +629,14 @@ private class Boxes.Wizard: Gtk.Stack, Boxes.UI {
         cancel_button.clicked.connect (cancel);
         back_button = wizard_window.topbar.back_btn;
         back_button.clicked.connect (() => {
-            prepare_cancellable.cancel ();
-
-            page = page - 1;
+            if (page == WizardPage.SOURCE) {
+                return_if_fail (wizard_source.page == SourcePage.URL);
+                wizard_source.selected = null;
+                wizard_source.page = SourcePage.MAIN;
+            } else {
+                prepare_cancellable.cancel ();
+                page = page - 1;
+            }
         });
         continue_button = wizard_window.topbar.continue_btn;
         continue_button.clicked.connect (() => {
@@ -643,7 +648,12 @@ private class Boxes.Wizard: Gtk.Stack, Boxes.UI {
             page = WizardPage.LAST;
         });
 
-        wizard_source.setup_ui (window);
+        wizard_source.setup_ui (window, wizard_window);
+    }
+
+    public void update_back_button_sensitivity () {
+        var disable_back_button = page == WizardPage.SOURCE && wizard_source.page == SourcePage.MAIN;
+        back_button.sensitive = !disable_back_button;
     }
 
     public void open_with_uri (string uri, bool skip_review_for_live = true) {