From bb508dc347f1fc7459cd35506b6507795f04553c Mon Sep 17 00:00:00 2001
From: Tobias Taschner <TcT2k@users.noreply.github.com>
Date: Thu, 16 Jan 2020 20:50:26 +0100
Subject: [PATCH] Implement text selection in wxWebViewEdge

Text selection/copy/paste etc implemented via javascript
---
 include/wx/msw/webview_edge.h |  3 ++
 interface/wx/webview.h        |  2 +-
 src/msw/webview_edge.cpp      | 54 +++++++++++++++++++++--------------
 3 files changed, 36 insertions(+), 23 deletions(-)

diff --git a/include/wx/msw/webview_edge.h b/include/wx/msw/webview_edge.h
index 6a77065a3b..e1ccdcefab 100644
--- a/include/wx/msw/webview_edge.h
+++ b/include/wx/msw/webview_edge.h
@@ -111,6 +111,9 @@ public:
     virtual void EnableAccessToDevTools(bool enable = true) wxOVERRIDE;
     virtual bool IsAccessToDevToolsEnabled() const wxOVERRIDE;
 
+    bool QueryCommandEnabled(const wxString& command) const;
+    void ExecCommand(const wxString& command);
+
     virtual bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
 
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
diff --git a/interface/wx/webview.h b/interface/wx/webview.h
index c816200dd2..6c5a2b0ad6 100644
--- a/interface/wx/webview.h
+++ b/interface/wx/webview.h
@@ -285,7 +285,7 @@ public:
     <a href="https://docs.microsoft.com/en-us/microsoft-edge/hosting/webview2">Edge WebView2</a>.
     It is available for Windows 7 and newer.
     The following features are currently unsupported with this backend:
-    virtual filesystems, custom urls, text selection, find, source code.
+    virtual filesystems, custom urls, find, source code.
 
     This backend is not enabled by default, to build it follow these steps:
     - Visual Studio 2015, or newer, is required
diff --git a/src/msw/webview_edge.cpp b/src/msw/webview_edge.cpp
index d44914ebb4..88ff6c13a2 100644
--- a/src/msw/webview_edge.cpp
+++ b/src/msw/webview_edge.cpp
@@ -598,57 +598,52 @@ void wxWebViewEdge::SetZoom(wxWebViewZoom zoom)
 
 bool wxWebViewEdge::CanCut() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return false;
+    return QueryCommandEnabled("cut");
 }
 
 bool wxWebViewEdge::CanCopy() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return false;
+    return QueryCommandEnabled("copy");
 }
 
 bool wxWebViewEdge::CanPaste() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return false;
+    return QueryCommandEnabled("paste");
 }
 
 void wxWebViewEdge::Cut()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    ExecCommand("cut");
 }
 
 void wxWebViewEdge::Copy()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    ExecCommand("copy");
 }
 
 void wxWebViewEdge::Paste()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    ExecCommand("paste");
 }
 
 bool wxWebViewEdge::CanUndo() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return false;
+    return QueryCommandEnabled("undo");
 }
 
 bool wxWebViewEdge::CanRedo() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return false;
+    return QueryCommandEnabled("redo");
 }
 
 void wxWebViewEdge::Undo()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    ExecCommand("undo");
 }
 
 void wxWebViewEdge::Redo()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    ExecCommand("redo");
 }
 
 long wxWebViewEdge::Find(const wxString& WXUNUSED(text), int WXUNUSED(flags))
@@ -670,24 +665,26 @@ bool wxWebViewEdge::IsEditable() const
 
 void wxWebViewEdge::SelectAll()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    RunScript("window.getSelection().selectAllChildren(document);");
 }
 
 bool wxWebViewEdge::HasSelection() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return false;
+    wxString rangeCountStr;
+    const_cast<wxWebViewEdge*>(this)->RunScript("window.getSelection().rangeCount;", &rangeCountStr);
+    return rangeCountStr != "0";
 }
 
 void wxWebViewEdge::DeleteSelection()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    ExecCommand("delete");
 }
 
 wxString wxWebViewEdge::GetSelectedText() const
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
-    return wxString();
+    wxString selectedText;
+    const_cast<wxWebViewEdge*>(this)->RunScript("window.getSelection().toString();", &selectedText);
+    return selectedText;
 }
 
 wxString wxWebViewEdge::GetSelectedSource() const
@@ -698,7 +695,7 @@ wxString wxWebViewEdge::GetSelectedSource() const
 
 void wxWebViewEdge::ClearSelection()
 {
-    // TODO: not implemented in SDK (could probably be implemented by script)
+    RunScript("window.getSelection().empty();");
 }
 
 void wxWebViewEdge::EnableContextMenu(bool enable)
@@ -749,6 +746,19 @@ void* wxWebViewEdge::GetNativeBackend() const
     return m_impl->m_webView;
 }
 
+bool wxWebViewEdge::QueryCommandEnabled(const wxString& command) const
+{
+    wxString resultStr;
+    const_cast<wxWebViewEdge*>(this)->RunScript(
+        wxString::Format("function f(){ return document.queryCommandEnabled('%s'); } f();", command), &resultStr);
+    return resultStr.IsSameAs("true", false);
+}
+
+void wxWebViewEdge::ExecCommand(const wxString& command)
+{
+    RunScript(wxString::Format("document.execCommand('%s');", command));
+}
+
 bool wxWebViewEdge::RunScriptSync(const wxString& javascript, wxString* output)
 {
     bool scriptExecuted = false;