simple_app.cxx

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// Author: Sergey Linev <S.Linev@gsi.de>
// Date: 2017-06-29
// Warning: This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
 
// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
 
/*************************************************************************
 * Copyright (C) 1995-2023, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
 
#if !defined(_MSC_VER)
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wshadow"
#endif
 
#include "simple_app.h"
 
#include <string>
#include <cstdio>
#include <memory>
 
#include "include/base/cef_build.h"
#include "include/cef_browser.h"
#include "include/cef_version.h"
#include "include/views/cef_browser_view.h"
#include "include/views/cef_window.h"
#include "include/wrapper/cef_helpers.h"
 
#include "THttpServer.h"
#include "TTimer.h"
#include <ROOT/RLogger.hxx>
 
#include "RCefWebDisplayHandle.hxx"
 
namespace {
 
// When using the Views framework this object provides the delegate
// implementation for the CefWindow that hosts the Views-based browser.
class SimpleWindowDelegate : public CefWindowDelegate {
   CefRefPtr<CefBrowserView> fBrowserView;
   int fWidth = 800;  ///< preferred window width
   int fHeight = 600; ///< preferred window height
   bool fBatch = false;
public:
   explicit SimpleWindowDelegate(CefRefPtr<CefBrowserView> browser_view, int width = 800, int height = 600, bool batch = false)
      : fBrowserView(browser_view), fWidth(width), fHeight(height), fBatch(batch)
   {
   }
 
   void OnWindowCreated(CefRefPtr<CefWindow> window) override
   {
      window->AddChildView(fBrowserView);
 
      if (fBatch) {
         window->Hide();
      } else {
         window->Show();
         // Give keyboard focus to the browser view.
         fBrowserView->RequestFocus();
      }
   }
 
   void OnWindowDestroyed(CefRefPtr<CefWindow> window) override { fBrowserView = nullptr; }
 
   bool CanClose(CefRefPtr<CefWindow> window) override
   {
      // Allow the window to close if the browser says it's OK.
      CefRefPtr<CefBrowser> browser = fBrowserView->GetBrowser();
      if (browser)
         return browser->GetHost()->TryCloseBrowser();
      return true;
   }
 
   CefSize GetPreferredSize(CefRefPtr<CefView> view) override
   {
     return CefSize(fWidth, fHeight);
   }
 
 
private:
 
   IMPLEMENT_REFCOUNTING(SimpleWindowDelegate);
   DISALLOW_COPY_AND_ASSIGN(SimpleWindowDelegate);
};
 
 
class SimpleBrowserViewDelegate : public CefBrowserViewDelegate {
 public:
  SimpleBrowserViewDelegate() {}
 
  bool OnPopupBrowserViewCreated(CefRefPtr<CefBrowserView> browser_view,
                                 CefRefPtr<CefBrowserView> popup_browser_view,
                                 bool is_devtools) override {
    // Create a new top-level Window for the popup. It will show itself after
    // creation.
    CefWindow::CreateTopLevelWindow(new SimpleWindowDelegate(popup_browser_view));
 
    // We created the Window.
    return true;
  }
 
 private:
  IMPLEMENT_REFCOUNTING(SimpleBrowserViewDelegate);
  DISALLOW_COPY_AND_ASSIGN(SimpleBrowserViewDelegate);
};
 
 
} // namespace
 
SimpleApp::SimpleApp(bool use_viewes, bool supress_log,
                     THttpServer *serv, const std::string &url, const std::string &cont,
                     int width, int height, bool headless)
   : CefApp(), CefBrowserProcessHandler(), fUseViewes(use_viewes), fSupressLog(supress_log),
     fFirstServer(serv), fFirstUrl(url), fFirstContent(cont), fFirstHeadless(headless)
{
   fFirstRect.Set(0, 0, width, height);
 
#if defined(OS_WIN) || defined(OS_LINUX)
   // Create the browser using the Views framework if "--use-views" is specified
   // via the command-line. Otherwise, create the browser using the native
   // platform framework. The Views framework is currently only supported on
   // Windows and Linux.
#else
//   if (fUseViewes) {
//      R__LOG_ERROR(CefWebDisplayLog()) << "view framework does not supported by CEF on the platform, switching off";
//      fUseViewes = false;
//   }
#endif
 
}
 
 
void SimpleApp::SetNextHandle(RCefWebDisplayHandle *handle, bool headless)
{
   fNextHandle = handle;
   fNextHeadless = headless;
}
 
 
void SimpleApp::OnRegisterCustomSchemes(CefRawPtr<CefSchemeRegistrar> registrar)
{
   // registrar->AddCustomScheme("rootscheme", true, true, true, true, true, true);
  // registrar->AddCustomScheme("rootscheme", true, false, false, true, false, false);
}
 
void SimpleApp::OnBeforeCommandLineProcessing(const CefString &process_type, CefRefPtr<CefCommandLine> command_line)
{
   if (fSupressLog) {
      command_line->AppendSwitchWithValue("v", "-1");
      command_line->AppendSwitch("disable-logging");
      command_line->AppendSwitchWithValue("enable-logging", "none");
   }
 
   if (fNextHeadless) {
      command_line->AppendSwitchWithValue("user-data-dir", ".");
      command_line->AppendSwitch("allow-file-access-from-files");
      command_line->AppendSwitch("disable-web-security");
      command_line->AppendSwitch("off-screen-rendering-enabled");
   }
 
#ifdef OS_MACOSX
   if (fNextHeadless) {
      command_line->AppendSwitch("headless");
      command_line->AppendSwitchWithValue("use-angle", "swiftshader");
      command_line->AppendSwitch("enable-unsafe-swiftshader");
      command_line->AppendSwitch("disable-gpu");
      // command_line->AppendSwitch("enable-gpu-rasterization");
      // if (fUseViewes)
      //   command_line->AppendSwitchWithValue("ozone-platform", "headless");
   } else {
      command_line->AppendSwitchWithValue("use-angle", "metal");
      command_line->AppendSwitch("ignore-gpu-blocklist");
      command_line->AppendSwitch("enable-webgl");
   }
#endif
 
#ifdef OS_LINUX
   if (fNextHeadless) {
      command_line->AppendSwitch("headless");
      command_line->AppendSwitchWithValue("use-gl", "swiftshader");
      command_line->AppendSwitch("disable-gpu");
      command_line->AppendSwitch("ignore-gpu-blocklist");
      command_line->AppendSwitch("enable-unsafe-swiftshader");
 
      if (fUseViewes)
         command_line->AppendSwitchWithValue("ozone-platform", "headless");
   }
#endif
}
 
void SimpleApp::OnBeforeChildProcessLaunch(CefRefPtr<CefCommandLine> command_line)
{
}
 
void SimpleApp::OnContextInitialized()
{
   CEF_REQUIRE_UI_THREAD();
 
   if (!fFirstUrl.empty() || !fFirstContent.empty()) {
      StartWindow(fFirstServer, fFirstUrl, fFirstContent, fFirstRect, fFirstHeadless);
      fFirstUrl.clear();
      fFirstContent.clear();
   }
}
 
 
void SimpleApp::StartWindow(THttpServer *serv, const std::string &addr, const std::string &cont, CefRect &rect, bool is_headless)
{
   CEF_REQUIRE_UI_THREAD();
 
   bool is_batch = (addr.empty() && !cont.empty()) || is_headless;
 
   if (!fGuiHandler)
      fGuiHandler = new GuiHandler(fUseViewes);
 
   std::string url;
 
   if(is_batch)
      url = fGuiHandler->AddBatchPage(cont);
   else if (serv)
      url = fGuiHandler->MakePageUrl(serv, addr);
   else
      url = addr;
 
   // Specify CEF browser settings here.
   CefBrowserSettings browser_settings;
   if (is_batch)
      browser_settings.windowless_frame_rate = 30;
   // browser_settings.plugins = STATE_DISABLED;
   // browser_settings.file_access_from_file_urls = STATE_ENABLED;
   // browser_settings.universal_access_from_file_urls = STATE_ENABLED;
   // browser_settings.web_security = STATE_DISABLED;
 
   if (fUseViewes) {
      // Create the BrowserView.
      CefRefPtr<CefBrowserView> browser_view =
         CefBrowserView::CreateBrowserView(fGuiHandler, url, browser_settings, nullptr, nullptr, new SimpleBrowserViewDelegate());
 
      // Create the Window. It will show itself after creation.
      CefWindow::CreateTopLevelWindow(new SimpleWindowDelegate(browser_view, rect.width, rect.height, is_batch));
 
      if (fNextHandle) {
         fNextHandle->SetBrowser(browser_view->GetBrowser());
         fNextHandle = nullptr; // used only once
      }
 
   } else {
 
      CefWindowInfo window_info;
 
      // TODO: Seems to be, to configure window_info.SetAsWindowless,
      // one should implement CefRenderHandler
 
      #if defined(OS_WIN)
         if (!rect.IsEmpty())
            window_info.SetAsChild(0, rect);
         // On Windows we need to specify certain flags that will be passed to
         // CreateWindowEx().
         window_info.SetAsPopup(0, "cefsimple");
         if (is_batch)
            // window_info.SetAsWindowless(GetDesktopWindow());
            window_info.SetAsWindowless(kNullWindowHandle);
      #else
         if (!rect.IsEmpty())
            window_info.SetAsChild(0, rect);
         if (is_batch)
            window_info.SetAsWindowless(kNullWindowHandle);
      #endif
 
      // Create the first browser window.
      auto browser = CefBrowserHost::CreateBrowserSync(window_info, fGuiHandler, url, browser_settings, nullptr, nullptr);
 
      if (fNextHandle) {
         fNextHandle->SetBrowser(browser);
         fNextHandle = nullptr; // used only once
      }
 
   }
 
}