Allow using a fixed version with wxWebViewEdge

A fixed version may be distributed with the application
and wxWebViewEdge::MSWSetBrowserExecutableDir() allows
it's usage with wxWebViewEdge.

include/wx/msw/private/webview_edge.h

@@ -66,6 +66,7 @@ public:
     ICoreWebView2Settings* GetSettings();
 
     static wxDynamicLibrary ms_loaderDll;
+    static wxString ms_browserExecutableDir;
 
     static bool Initialize();
 

include/wx/msw/webview_edge.h

@@ -122,6 +122,8 @@ public:
 
     virtual void* GetNativeBackend() const wxOVERRIDE;
 
+    static void MSWSetBrowserExecutableDir(const wxString& path);
+
 protected:
     virtual void DoSetPage(const wxString& html, const wxString& baseUrl) wxOVERRIDE;
 

interface/wx/webview.h

@@ -330,6 +330,12 @@ public:
     - Make sure to add a note about using the WebView2 SDK to your application
       documentation, as required by its licence
 
+    If your application should use a
+    <a href="https://docs.microsoft.com/en-us/microsoft-edge/webview2/concepts/distribution#fixed-version-distribution-mode">
+    fixed version</a> of the WebView2 runtime you must use
+    wxWebViewEdge::MSWSetBrowserExecutableDir() to specify its usage before
+    using the edge backend.
+
     @par wxWEBVIEW_WEBKIT (GTK)
 
     Under GTK the WebKit backend uses

samples/webview/webview.cpp

@@ -30,6 +30,9 @@
 #if wxUSE_WEBVIEW_IE
 #include "wx/msw/webview_ie.h"
 #endif
+#if wxUSE_WEBVIEW_EDGE
+#include "wx/msw/webview_edge.h"
+#endif
 #include "wx/webviewarchivehandler.h"
 #include "wx/webviewfshandler.h"
 #include "wx/numdlg.h"
@@ -37,6 +40,7 @@
 #include "wx/filesys.h"
 #include "wx/fs_arc.h"
 #include "wx/fs_mem.h"
+#include "wx/stdpaths.h"
 
 #ifndef wxHAS_IMAGES_IN_RESOURCES
     #include "../sample.xpm"
@@ -373,6 +377,16 @@ WebFrame::WebFrame(const wxString& url) :
     // Create the webview
     wxString backend = wxWebViewBackendDefault;
 #ifdef __WXMSW__
+    // Check if a fixed version of edge is present in
+    // $executable_path/edge_fixed and use it
+    wxFileName edgeFixedDir(wxStandardPaths::Get().GetExecutablePath());
+    edgeFixedDir.SetFullName("");
+    edgeFixedDir.AppendDir("edge_fixed");
+    if (edgeFixedDir.DirExists())
+    {
+        wxWebViewEdge::MSWSetBrowserExecutableDir(edgeFixedDir.GetFullPath());
+        wxLogMessage("Using fixed edge version");
+    }
     if (wxWebView::IsBackendAvailable(wxWebViewBackendEdge))
     {
         wxLogMessage("Using Edge backend");

src/msw/webview_edge.cpp

@@ -52,6 +52,7 @@ CreateCoreWebView2EnvironmentWithOptions_t wxCreateCoreWebView2EnvironmentWithOp
 GetAvailableCoreWebView2BrowserVersionString_t wxGetAvailableCoreWebView2BrowserVersionString = NULL;
 
 wxDynamicLibrary wxWebViewEdgeImpl::ms_loaderDll;
+wxString wxWebViewEdgeImpl::ms_browserExecutableDir;
 
 wxWebViewEdgeImpl::wxWebViewEdgeImpl(wxWebViewEdge* webview):
     m_ctrl(webview)
@@ -85,7 +86,7 @@ bool wxWebViewEdgeImpl::Create()
     wxString userDataPath = wxStandardPaths::Get().GetUserLocalDataDir();
 
     HRESULT hr = wxCreateCoreWebView2EnvironmentWithOptions(
-        nullptr,
+        ms_browserExecutableDir.wc_str(),
         userDataPath.wc_str(),
         nullptr,
         Callback<ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler>(this,
@@ -127,7 +128,8 @@ bool wxWebViewEdgeImpl::Initialize()
 
     // Check if a Edge browser can be found by the loader DLL
     wxCoTaskMemPtr<wchar_t> versionStr;
-    HRESULT hr = wxGetAvailableCoreWebView2BrowserVersionString(NULL, &versionStr);
+    HRESULT hr = wxGetAvailableCoreWebView2BrowserVersionString(
+        ms_browserExecutableDir.wc_str(), &versionStr);
     if (FAILED(hr) || !versionStr)
     {
         wxLogApiError("GetCoreWebView2BrowserVersionInfo", hr);
@@ -780,6 +782,11 @@ bool wxWebViewEdge::QueryCommandEnabled(const wxString& command) const
 void wxWebViewEdge::ExecCommand(const wxString& command)
 {
     RunScript(wxString::Format("document.execCommand('%s');", command));
+}
+
+void wxWebViewEdge::MSWSetBrowserExecutableDir(const wxString & path)
+{
+    wxWebViewEdgeImpl::ms_browserExecutableDir = path;
 }
 
 bool wxWebViewEdge::RunScriptSync(const wxString& javascript, wxString* output)