Add a CefHandler::HandleSetFocus() callback that gets called when the browser control or a child widget requests focus. This callback gives the client an opportunity to cancel the focus change. (Issue #34, initial patch by tux316).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@29 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/cef.h

@@ -530,6 +530,13 @@ public:
   virtual RetVal HandleJSBinding(CefRefPtr<CefBrowser> browser,
                                  CefRefPtr<CefFrame> frame,
                                  CefRefPtr<CefV8Value> object) =0;
+
+  // Called when the browser component is requesting focus. |isWidget| will be
+  // true if the focus is requested for a child widget of the browser window.
+  // Return RV_CONTINUE to allow the focus to be set or RV_HANDLED to cancel
+  // setting the focus.
+  virtual RetVal HandleSetFocus(CefRefPtr<CefBrowser> browser,
+                                bool isWidget) =0;
 };
 
 

include/cef_capi.h

@@ -437,6 +437,14 @@ typedef struct _cef_handler_t
   enum cef_retval_t (CEF_CALLBACK *handle_jsbinding)(
       struct _cef_handler_t* handler, cef_browser_t* browser,
       cef_frame_t* frame, struct _cef_v8value_t* object);
+
+  // Called when the browser component is requesting focus. |isWidget| will be
+  // true (1) if the focus is requested for a child widget of the browser
+  // window. Return RV_CONTINUE to allow the focus to be set or RV_HANDLED to
+  // cancel setting the focus.
+  enum cef_retval_t (CEF_CALLBACK *handle_set_focus)(
+      struct _cef_handler_t* handler, cef_browser_t* browser, int isWidget);
+
 } cef_handler_t;
 
 

libcef/browser_impl.cc

@@ -548,13 +548,19 @@ bool CefBrowserImpl::UIT_Navigate(const BrowserNavigationEntry& entry,
   // In case LoadRequest failed before DidCreateDataSource was called.
   delegate_->set_pending_extra_data(NULL);
 
+  if (handler_.get() && handler_->HandleSetFocus(this, false) == RV_CONTINUE) {
     // Restore focus to the main frame prior to loading new request.
     // This makes sure that we don't have a focused iframe. Otherwise, that
     // iframe would keep focus when the SetFocus called immediately after
     // LoadRequest, thus making some tests fail (see http://b/issue?id=845337
     // for more details).
+    // TODO(cef): The above comment may be wrong, or the below call to
+    // SetFocusedFrame() may be unnecessary or in the wrong place.  See this
+    // thread for additional details:
+    // http://groups.google.com/group/chromium-dev/browse_thread/thread/42bcd31b59e3a168
     GetWebView()->SetFocusedFrame(frame);
     UIT_SetFocus(GetWebViewHost(), true);
+  }
 
   return true;
 }

libcef/browser_webview_delegate.cc

@@ -548,8 +548,11 @@ void BrowserWebViewDelegate::DidScrollRect(WebWidget* webwidget, int dx, int dy,
 }
 
 void BrowserWebViewDelegate::Focus(WebWidget* webwidget) {
-  if (WebWidgetHost* host = GetHostForWidget(webwidget))
+  if (WebWidgetHost* host = GetHostForWidget(webwidget)) {
+    CefRefPtr<CefHandler> handler = browser_->GetHandler();
+    if (handler.get() && handler->HandleSetFocus(browser_, true) == RV_CONTINUE)
       browser_->UIT_SetFocus(host, true);
+  }
 }
 
 void BrowserWebViewDelegate::Blur(WebWidget* webwidget) {

libcef_dll/cpptoc/handler_cpptoc.cc

@@ -440,6 +440,18 @@ enum cef_retval_t CEF_CALLBACK handler_handle_jsbinding(
       CefV8ValueCToCpp::Wrap(object));
 }
 
+enum cef_retval_t CEF_CALLBACK handler_handle_set_focus(
+    struct _cef_handler_t* handler, cef_browser_t* browser, int isWidget)
+{
+  DCHECK(handler);
+  DCHECK(browser);
+  if(!handler || !browser)
+    return RV_CONTINUE;
+
+  return CefHandlerCppToC::Get(handler)->HandleSetFocus(
+      CefBrowserCToCpp::Wrap(browser), isWidget);
+}
+
 
 CefHandlerCppToC::CefHandlerCppToC(CefHandler* cls)
     : CefCppToC<CefHandlerCppToC, CefHandler, cef_handler_t>(cls)
@@ -466,6 +478,7 @@ CefHandlerCppToC::CefHandlerCppToC(CefHandler* cls)
       handler_handle_before_window_close;
   struct_.struct_.handle_take_focus = handler_handle_take_focus;
   struct_.struct_.handle_jsbinding = handler_handle_jsbinding;
+  struct_.struct_.handle_set_focus = handler_handle_set_focus;
 }
 
 #ifdef _DEBUG

libcef_dll/ctocpp/handler_ctocpp.cc

@@ -328,6 +328,16 @@ CefHandler::RetVal CefHandlerCToCpp::HandleJSBinding(
       CefFrameCppToC::Wrap(frame), CefV8ValueCppToC::Wrap(object));
 }
 
+CefHandler::RetVal CefHandlerCToCpp::HandleSetFocus(
+    CefRefPtr<CefBrowser> browser, bool isWidget)
+{
+    if(CEF_MEMBER_MISSING(struct_, handle_set_focus))
+        return RV_CONTINUE;
+
+    return struct_->handle_set_focus(struct_, CefBrowserCppToC::Wrap(browser),
+        isWidget);
+}
+
 #ifdef _DEBUG
 long CefCToCpp<CefHandlerCToCpp, CefHandler, cef_handler_t>::DebugObjCt = 0;
 #endif

libcef_dll/ctocpp/handler_ctocpp.h

@@ -90,6 +90,8 @@ public:
   virtual RetVal HandleJSBinding(CefRefPtr<CefBrowser> browser,
                                  CefRefPtr<CefFrame> frame,
                                  CefRefPtr<CefV8Value> object);
+  virtual RetVal HandleSetFocus(CefRefPtr<CefBrowser> browser,
+                                bool isWidget);
 };
 
 

tests/cefclient/cefclient.cpp

@@ -720,6 +720,16 @@ public:
     return RV_HANDLED;
   }
 
+  // Called when the browser component is requesting focus. |isWidget| will be
+  // true if the focus is requested for a child widget of the browser window.
+  // Return RV_CONTINUE to allow the focus to be set or RV_HANDLED to cancel
+  // setting the focus.
+  virtual RetVal HandleSetFocus(CefRefPtr<CefBrowser> browser,
+                                bool isWidget)
+  {
+    return RV_CONTINUE;
+  }
+
   // Retrieve the current navigation state flags
   void GetNavState(bool &isLoading, bool &canGoBack, bool &canGoForward)
   {