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// Copyright (c) 2016 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.
#ifndef UI_EVENTS_KEYCODES_PLATFORM_KEY_MAP_WIN_H_
#define UI_EVENTS_KEYCODES_PLATFORM_KEY_MAP_WIN_H_
#include <windows.h>
#include <unordered_map>
#include "base/hash.h"
#include "ui/events/event.h"
#include "ui/events/events_export.h"
#include "ui/events/keycodes/dom/dom_key.h"
#include "ui/events/keycodes/keyboard_codes_win.h"
#include "ui/events/platform_event.h"
namespace ui {
class EVENTS_EXPORT PlatformKeyMap {
public:
// Create and load key map table with specified keyboard layout.
// Visible for testing.
explicit PlatformKeyMap(HKL layout);
~PlatformKeyMap();
// Returns the DOM KeyboardEvent key from |KeyboardCode|+|EventFlags| and
// the keyboard layout of current thread. If this is an AltGraph modified
// key then |flags| will have Control+Alt removed, and AltGraph set.
// Updates a per-thread key map cache whenever the layout changes.
static DomKey DomKeyFromKeyboardCode(KeyboardCode key_code, int* flags);
// Returns true if the currently-active keymap uses AltGraph shift.
static bool UsesAltGraph();
// If the supplied event has both Control and Alt modifiers set, then they
// are replaced by AltGraph. This should only ever be applied to the flags
// for printable-character events.
static int ReplaceControlAndAltWithAltGraph(int flags);
private:
friend class PlatformKeyMapTest;
PlatformKeyMap();
// Returns the PlatformKeyMap instance for the current thread.
static PlatformKeyMap* GetThreadLocalPlatformKeyMap();
// TODO(input-dev): Expose this function when we need to access separate
// layout. Returns the DomKey 'meaning' of |KeyboardCode| in the context of
// specified |EventFlags| and stored keyboard layout.
DomKey DomKeyFromKeyboardCodeImpl(KeyboardCode, int* flags) const;
// TODO(input-dev): Expose this function in response to WM_INPUTLANGCHANGE.
void UpdateLayout(HKL layout);
HKL keyboard_layout_ = 0;
// True if |keyboard_layout_| makes use of the AltGraph modifier.
bool has_alt_graph_ = false;
typedef std::pair<int /*KeyboardCode*/, int /*EventFlags*/>
KeyboardCodeEventFlagsPair;
typedef std::unordered_map<KeyboardCodeEventFlagsPair,
DomKey,
base::IntPairHash<std::pair<int, int>>>
KeyboardCodeToKeyMap;
KeyboardCodeToKeyMap printable_keycode_to_key_;
DISALLOW_COPY_AND_ASSIGN(PlatformKeyMap);
};
} // namespace ui
#endif // UI_EVENTS_KEYCODES_PLATFORM_KEY_MAP_WIN_H_
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