Add support for specifying high DPI animations in XRC

Deprecate wxXmlResourceHandler::GetAnimation() function which returns
just a single animation and add a new GetAnimations() replacing it.

Use the new function in wxAnimationCtrl XRC handler to pass all the
animations defined in the XRC file to the control.

docs/doxygen/overviews/xrc_format.h

@@ -653,7 +653,9 @@ controls cannot have children.
 @beginTable
 @hdr3col{property, type, description}
 @row3col{animation, @ref overview_xrcformat_type_url,
-    Animation file to load into the control (default: none).}
+    Animation file to load into the control or, since wxWindow 3.3.0, multiple
+    semicolon-separated files in order of increasing size, corresponding to
+    multiple versions of the animation for different resolutions (default: none).}
 @row3col{inactive-bitmap, @ref overview_xrcformat_type_bitmap,
     Bitmap to use when not playing the animation (default: the default).}
 @endTable

include/wx/xrc/xmlres.h

@@ -621,11 +621,19 @@ public:
     wxImageList *GetImageList(const wxString& param = wxT("imagelist")) override;
 
 #if wxUSE_ANIMATIONCTRL
+    // Get all the animations defined in the given parameter which may contain
+    // more than one semicolon-separated paths.
+    wxAnimationBundle GetAnimations(const wxString& param = wxT("animation"),
+                                    wxAnimationCtrlBase* ctrl = nullptr) override;
+
+#if WXWIN_COMPATIBILITY_3_2
+    wxDEPRECATED_MSG("Use GetAnimations() instead")
     // Gets an animation creating it using the provided control (so that it
     // will be compatible with it) if any.
     wxAnimation* GetAnimation(const wxString& param = wxT("animation"),
                               wxAnimationCtrlBase* ctrl = nullptr) override;
-#endif
+#endif // WXWIN_COMPATIBILITY_3_2
+#endif // wxUSE_ANIMATIONCTRL
 
     // Gets a font.
     wxFont GetFont(const wxString& param = wxT("font"), wxWindow* parent = nullptr) override;

include/wx/xrc/xmlreshandler.h

@@ -22,6 +22,7 @@
 #include "wx/window.h"
 
 class WXDLLIMPEXP_FWD_CORE wxAnimation;
+class WXDLLIMPEXP_FWD_CORE wxAnimationBundle;
 class WXDLLIMPEXP_FWD_CORE wxAnimationCtrlBase;
 
 class WXDLLIMPEXP_FWD_XML wxXmlNode;
@@ -109,9 +110,15 @@ public:
     virtual wxImageList *GetImageList(const wxString& param = wxT("imagelist")) = 0;
 
 #if wxUSE_ANIMATIONCTRL
+    virtual wxAnimationBundle GetAnimations(const wxString& param = wxT("animation"),
+                                            wxAnimationCtrlBase* ctrl = nullptr) = 0;
+
+#if WXWIN_COMPATIBILITY_3_2
+    wxDEPRECATED_BUT_USED_INTERNALLY_MSG("Use GetAnimations() instead")
     virtual wxAnimation* GetAnimation(const wxString& param = wxT("animation"),
                                       wxAnimationCtrlBase* ctrl = nullptr) = 0;
-#endif
+#endif // WXWIN_COMPATIBILITY_3_2
+#endif // wxUSE_ANIMATIONCTRL
 
     virtual wxFont GetFont(const wxString& param = wxT("font"), wxWindow* parent = nullptr) = 0;
     virtual bool GetBoolAttr(const wxString& attr, bool defaultv) = 0;
@@ -377,12 +384,14 @@ protected:
     }
 
 #if wxUSE_ANIMATIONCTRL
+    wxAnimationBundle GetAnimations(const wxString& param = wxT("animation"),
+                                    wxAnimationCtrlBase* ctrl = nullptr);
+
+#if WXWIN_COMPATIBILITY_3_2
     wxAnimation* GetAnimation(const wxString& param = wxT("animation"),
-                              wxAnimationCtrlBase* ctrl = nullptr)
-    {
-        return GetImpl()->GetAnimation(param, ctrl);
-    }
-#endif
+                              wxAnimationCtrlBase* ctrl = nullptr);
+#endif // WXWIN_COMPATIBILITY_3_2
+#endif // wxUSE_ANIMATIONCTRL
 
     wxFont GetFont(const wxString& param = wxT("font"),
                    wxWindow* parent = nullptr)

src/xrc/xh_animatctrl.cpp

@@ -58,9 +58,9 @@ wxObject *wxAnimationCtrlXmlHandler::DoCreateResource()
     if ( GetBool("hidden", 0) == 1 )
         ctrl->Hide();
 
-    std::unique_ptr<wxAnimation> animation(GetAnimation("animation", ctrl));
-    if ( animation )
-        ctrl->SetAnimation(*animation);
+    const auto animations = GetAnimations("animation", ctrl);
+    if ( animations.IsOk() )
+        ctrl->SetAnimation(animations);
 
     // if no inactive-bitmap has been provided, GetBitmapBundle() will return
     // an empty bundle, which just tells wxAnimationCtrl to use the default
@@ -78,39 +78,61 @@ bool wxAnimationCtrlXmlHandler::CanHandle(wxXmlNode *node)
            IsOfClass(node, wxT("wxGenericAnimationCtrl"));
 }
 
+wxAnimationBundle
+wxXmlResourceHandlerImpl::GetAnimations(const wxString& param,
+                                        wxAnimationCtrlBase* ctrl)
+{
+    wxString paths = GetFilePath(GetParamNode(param));
+    if ( paths.empty() )
+        return {};
+
+    wxAnimationBundle animations;
+    for ( const auto& name: wxSplit(paths, ';', '\0') )
+    {
+        // create compatible animation object
+        wxAnimation ani;
+        if ( ctrl )
+            ani = ctrl->CreateAnimation();
+
+        // load the animation from file
+#if wxUSE_FILESYSTEM
+        wxFSFile * const
+            fsfile = GetCurFileSystem().OpenFile(name, wxFS_READ | wxFS_SEEKABLE);
+        if ( fsfile )
+        {
+            ani.Load(*fsfile->GetStream());
+            delete fsfile;
+        }
+#else
+        ani.LoadFile(name);
+#endif
+
+        if ( !ani.IsOk() )
+        {
+            ReportParamError
+            (
+                param,
+                wxString::Format("cannot create animation from \"%s\"", name)
+            );
+            return {};
+        }
+
+        animations.Add(ani);
+    }
+
+    return animations;
+}
+
+#if WXWIN_COMPATIBILITY_3_2
+
 wxAnimation* wxXmlResourceHandlerImpl::GetAnimation(const wxString& param,
                                                     wxAnimationCtrlBase* ctrl)
 {
-    wxString name = GetFilePath(GetParamNode(param));
-    if ( name.empty() )
-        return nullptr;
+    const auto animations = GetAnimations(param, ctrl);
 
-    // load the animation from file
-    std::unique_ptr<wxAnimation> ani(ctrl ? new wxAnimation(ctrl->CreateAnimation())
-                                      : new wxAnimation);
-#if wxUSE_FILESYSTEM
-    wxFSFile * const
-        fsfile = GetCurFileSystem().OpenFile(name, wxFS_READ | wxFS_SEEKABLE);
-    if ( fsfile )
-    {
-        ani->Load(*fsfile->GetStream());
-        delete fsfile;
-    }
-#else
-    ani->LoadFile(name);
-#endif
-
-    if ( !ani->IsOk() )
-    {
-        ReportParamError
-        (
-            param,
-            wxString::Format("cannot create animation from \"%s\"", name)
-        );
-        return nullptr;
-    }
-
-    return ani.release();
+    return animations.IsOk() ? new wxAnimation(animations.GetAll()[0]) : nullptr;
 }
 
+#endif // WXWIN_COMPATIBILITY_3_2
+
 #endif // wxUSE_XRC && wxUSE_ANIMATIONCTRL

src/xrc/xmlreshandler.cpp

@@ -14,6 +14,10 @@
 
 #include "wx/xrc/xmlreshandler.h"
 
+#if wxUSE_ANIMATIONCTRL
+    #include "wx/animate.h"
+#endif
+
 wxIMPLEMENT_ABSTRACT_CLASS(wxXmlResourceHandler, wxObject);
 
 wxXmlResourceHandlerImplBase* wxXmlResourceHandler::GetImpl() const
@@ -65,4 +69,24 @@ void wxXmlResourceHandler::AddWindowStyles()
     XRC_ADD_STYLE(wxWS_EX_PROCESS_UI_UPDATES);
 }
 
+#if wxUSE_ANIMATIONCTRL
+
+wxAnimationBundle
+wxXmlResourceHandler::GetAnimations(const wxString& param,
+                                    wxAnimationCtrlBase* ctrl)
+{
+    return GetImpl()->GetAnimations(param, ctrl);
+}
+
+#if WXWIN_COMPATIBILITY_3_2
+wxAnimation*
+wxXmlResourceHandler::GetAnimation(const wxString& param,
+                                   wxAnimationCtrlBase* ctrl)
+{
+    return GetImpl()->GetAnimation(param, ctrl);
+}
+#endif // WXWIN_COMPATIBILITY_3_2
+
+#endif // wxUSE_ANIMATIONCTRL
+
 #endif // wxUSE_XRC