// Copyright (c) 2014 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.

#include "cefsimple/simple_handler.h"

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <string>

#include "include/cef_browser.h"
#include "include/wrapper/cef_helpers.h"

void SimpleHandler::OnTitleChange(CefRefPtr<CefBrowser> browser,
                                  const CefString& title) {
  CEF_REQUIRE_UI_THREAD();
  std::string titleStr(title);

  // Retrieve the X11 display shared with Chromium.
  ::Display* display = cef_get_xdisplay();
  DCHECK(display);

  // Retrieve the X11 window handle for the browser.
  ::Window window = browser->GetHost()->GetWindowHandle();
  DCHECK(window != kNullWindowHandle);

  // Retrieve the atoms required by the below XChangeProperty call.
  const char* kAtoms[] = {
    "_NET_WM_NAME",
    "UTF8_STRING"
  };
  Atom atoms[2];
  int result = XInternAtoms(display, const_cast<char**>(kAtoms), 2, false,
                            atoms);
  if (!result)
    NOTREACHED();

  // Set the window title.
  XChangeProperty(display,
                  window,
                  atoms[0],
                  atoms[1],
                  8,
                  PropModeReplace,
                  reinterpret_cast<const unsigned char*>(titleStr.c_str()),
                  titleStr.size());

  // TODO(erg): This is technically wrong. So XStoreName and friends expect
  // this in Host Portable Character Encoding instead of UTF-8, which I believe
  // is Compound Text. This shouldn't matter 90% of the time since this is the
  // fallback to the UTF8 property above.
  XStoreName(display, browser->GetHost()->GetWindowHandle(), titleStr.c_str());
}