Add strikethrough support for fonts defined in XRC

Handle this attribute as well as "underlined" for completeness.

docs/changes.txt

@@ -115,6 +115,7 @@ All (GUI):
 - Support strike-through in wxDataViewItem attributes (approach, Igor Korot).
 - Allow distinguishing between user- and script-opened windows in wxWebView.
 - Allow binding to events generated by their items in submenus too.
+- Add strikethrough support for fonts defined in XRC.
 
 wxGTK:
 

docs/doxygen/overviews/xrc_format.h

@@ -422,6 +422,9 @@ and can be one of the following "sub-properties":
     (default: default).}
 @row3col{underlined, @ref overview_xrcformat_type_bool,
     Whether the font should be underlined (default: 0).}
+@row3col{strikethrough, @ref overview_xrcformat_type_bool,
+    Whether the strikethrough font should be used (default: 0). This property
+    is only supported since wxWidgets 3.1.2.}
 @row3col{face, ,
     Comma-separated list of face names; the first one available is used
     (default: unspecified).}

misc/schema/xrc_schema.rnc

@@ -462,6 +462,7 @@ t_font       = (
                    [xrc:p="o"] element family       {_, ("roman" | "script" | "decorative" | "swiss" |
                                                          "modern" | "teletype") }* &
                    [xrc:p="o"] element underlined   {_, t_bool }* &
+                   [xrc:p="o"] element strikethrough{_, t_bool }* &
                    [xrc:p="o"] element face         {_, t_text }* &
                    [xrc:p="o"] element encoding     {_, t_text }* &
                    [xrc:p="o"] element sysfont      {_, ("wxSYS_OEM_FIXED_FONT" | "wxSYS_ANSI_FIXED_FONT" |

samples/xrc/rc/controls.xrc

@@ -1099,7 +1099,7 @@ lay them out using wxSizers, absolute positioning, everything you like!
                                 <flag>wxALIGN_RIGHT|wxALIGN_CENTRE_VERTICAL|wxALL</flag>
                                 <border>5</border>
                                 <object class="wxStaticText" name="wxID_STATIC">
-                                    <label>Slightly larger font:</label>
+                                    <label>Slightly larger strikethrough font:</label>
                                 </object>
                             </object>
                             <object class="sizeritem">
@@ -1109,6 +1109,7 @@ lay them out using wxSizers, absolute positioning, everything you like!
                                     <label>It was a dark and stormy night.</label>
                                     <font>
                                         <size>12.5</size>
+                                        <strikethrough>1</strikethrough>
                                     </font>
                                 </object>
                             </object>

src/xrc/xmlres.cpp

@@ -2349,6 +2349,10 @@ wxFont wxXmlResourceHandlerImpl::GetFont(const wxString& param, wxWindow* parent
     bool hasUnderlined = HasParam(wxT("underlined"));
     bool underlined = hasUnderlined ? GetBool(wxT("underlined"), false) : false;
 
+    // strikethrough
+    bool hasStrikethrough = HasParam(wxT("strikethrough"));
+    bool strikethrough = hasStrikethrough ? GetBool(wxT("strikethrough"), false) : false;
+
     // family and facename
     wxFontFamily ifamily = wxFONTFAMILY_DEFAULT;
     bool hasFamily = HasParam(wxT("family"));
@@ -2466,6 +2470,8 @@ wxFont wxXmlResourceHandlerImpl::GetFont(const wxString& param, wxWindow* parent
             font.SetNumericWeight(iweight);
         if (hasUnderlined)
             font.SetUnderlined(underlined);
+        if (hasStrikethrough)
+            font.SetStrikethrough(strikethrough);
         if (hasFamily)
             font.SetFamily(ifamily);
         if (hasFacename)
@@ -2481,6 +2487,7 @@ wxFont wxXmlResourceHandlerImpl::GetFont(const wxString& param, wxWindow* parent
                 .Style(istyle)
                 .Weight(iweight)
                 .Underlined(underlined)
+                .Strikethrough(strikethrough)
                 .Encoding(enc)
                 ;
     }