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unhandled_keyboard_event_handler.cc

// Copyright (c) 2010 The Chromium 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 "chrome/browser/views/unhandled_keyboard_event_handler.h"

#include "base/logging.h"
#include "views/focus/focus_manager.h"

UnhandledKeyboardEventHandler::UnhandledKeyboardEventHandler() {
#if defined(OS_WIN)
  ignore_next_char_event_ = false;
#endif
}

UnhandledKeyboardEventHandler::~UnhandledKeyboardEventHandler() {
}

void UnhandledKeyboardEventHandler::HandleKeyboardEvent(
    const NativeWebKeyboardEvent& event,
    views::FocusManager* focus_manager) {
  if (!focus_manager) {
    NOTREACHED();
    return;
  }
#if defined(OS_WIN)
  // Previous calls to TranslateMessage can generate Char events as well as
  // RawKeyDown events, even if the latter triggered an accelerator.  In these
  // cases, we discard the Char events.
  if (event.type == WebKit::WebInputEvent::Char && ignore_next_char_event_) {
    ignore_next_char_event_ = false;
    return;
  }
  // It's necessary to reset this flag, because a RawKeyDown event may not
  // always generate a Char event.
  ignore_next_char_event_ = false;
#endif

  if (event.type == WebKit::WebInputEvent::RawKeyDown) {
    views::Accelerator accelerator(
        static_cast<base::KeyboardCode>(event.windowsKeyCode),
        (event.modifiers & NativeWebKeyboardEvent::ShiftKey) ==
            NativeWebKeyboardEvent::ShiftKey,
        (event.modifiers & NativeWebKeyboardEvent::ControlKey) ==
            NativeWebKeyboardEvent::ControlKey,
        (event.modifiers & NativeWebKeyboardEvent::AltKey) ==
            NativeWebKeyboardEvent::AltKey);

#if defined(OS_WIN)
    // This is tricky: we want to set ignore_next_char_event_ if
    // ProcessAccelerator returns true. But ProcessAccelerator might delete
    // |this| if the accelerator is a "close tab" one. So we speculatively
    // set the flag and fix it if no event was handled.
    ignore_next_char_event_ = true;
#endif

    if (focus_manager->ProcessAccelerator(accelerator)) {
      return;
    }

#if defined(OS_WIN)
    // ProcessAccelerator didn't handle the accelerator, so we know both
    // that |this| is still valid, and that we didn't want to set the flag.
    ignore_next_char_event_ = false;
#endif
  }

#if defined(OS_WIN)
  // Any unhandled keyboard/character messages should be defproced.
  // This allows stuff like F10, etc to work correctly.
  DefWindowProc(event.os_event.hwnd, event.os_event.message,
                event.os_event.wParam, event.os_event.lParam);
#endif
}


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