[simple-scan] Support A3 paper size

[Robert Ancell <rancell src gnome org>]

commit 314e779faa128af76eead56a0dbfd887d9f91f41
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Jun 26 09:50:17 2018 +1200

    Support A3 paper size

 src/app-window.ui           | 11 +++++++++++
 src/app-window.vala         | 13 ++++++++++++-
 src/page.vala               |  4 ++++
 src/preferences-dialog.vala |  2 ++
 4 files changed, 29 insertions(+), 1 deletion(-)
---
diff --git a/src/app-window.ui b/src/app-window.ui
index bbdf1c7..6e13088 100644
--- a/src/app-window.ui
+++ b/src/app-window.ui
@@ -390,6 +390,17 @@
                                 <signal name="toggled" handler="four_by_six_menuitem_toggled_cb" 
swapped="no"/>
                               </object>
                             </child>
+                            <child>
+                              <object class="GtkRadioMenuItem" id="a3_menuitem">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="label" translatable="yes" comments="Radio button for 
cropping page to A3">A_3</property>
+                                <property name="use_underline">True</property>
+                                <property name="draw_as_radio">True</property>
+                                <property name="group">no_crop_menuitem</property>
+                                <signal name="toggled" handler="a3_menuitem_toggled_cb" swapped="no"/>
+                              </object>
+                            </child>
                             <child>
                               <object class="GtkRadioMenuItem" id="custom_crop_menuitem">
                                 <property name="visible">True</property>
diff --git a/src/app-window.vala b/src/app-window.vala
index d956c08..b5d405d 100644
--- a/src/app-window.vala
+++ b/src/app-window.vala
@@ -52,6 +52,8 @@ public class AppWindow : Gtk.ApplicationWindow
     [GtkChild]
     private Gtk.RadioMenuItem custom_crop_menuitem;
     [GtkChild]
+    private Gtk.RadioMenuItem a3_menuitem;
+    [GtkChild]
     private Gtk.RadioMenuItem a4_menuitem;
     [GtkChild]
     private Gtk.RadioMenuItem a5_menuitem;
@@ -762,7 +764,9 @@ public class AppWindow : Gtk.ApplicationWindow
             var crop_name = page.crop_name;
             if (crop_name != null)
             {
-                if (crop_name == "A4")
+                if (crop_name == "A3")
+                    menuitem = a3_menuitem;
+                else if (crop_name == "A4")
                     menuitem = a4_menuitem;
                 else if (crop_name == "A5")
                     menuitem = a5_menuitem;
@@ -924,6 +928,13 @@ public class AppWindow : Gtk.ApplicationWindow
             set_crop ("A4");
     }
 
+    [GtkCallback]
+    private void a3_menuitem_toggled_cb (Gtk.CheckMenuItem widget)
+    {
+        if (widget.active)
+            set_crop ("A3");
+    }
+
     [GtkCallback]
     private void crop_rotate_menuitem_activate_cb (Gtk.Widget widget)
     {
diff --git a/src/page.vala b/src/page.vala
index c859df9..13de4d2 100644
--- a/src/page.vala
+++ b/src/page.vala
@@ -399,6 +399,10 @@ public class Page
         double w, h;
         switch (name)
         {
+        case "A3":
+            w = 11.7;
+            h = 16.5;
+            break;
         case "A4":
             w = 8.3;
             h = 11.7;
diff --git a/src/preferences-dialog.vala b/src/preferences-dialog.vala
index 962fa79..d58c066 100644
--- a/src/preferences-dialog.vala
+++ b/src/preferences-dialog.vala
@@ -82,6 +82,8 @@ private class PreferencesDialog : Gtk.Dialog
         paper_size_model.append (out iter);
         paper_size_model.set (iter, 0, 2100, 1, 2970, 2, "A4", -1);
         paper_size_model.append (out iter);
+        paper_size_model.set (iter, 0, 2970, 1, 4200, 2, "A3", -1);
+        paper_size_model.append (out iter);
         paper_size_model.set (iter, 0, 2159, 1, 2794, 2, "Letter", -1);
         paper_size_model.append (out iter);
         paper_size_model.set (iter, 0, 2159, 1, 3556, 2, "Legal", -1);