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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_IME_WIN_INPUT_METHOD_WIN_BASE_H_
#define UI_BASE_IME_WIN_INPUT_METHOD_WIN_BASE_H_
#include <windows.h>
#include "base/component_export.h"
#include "base/i18n/rtl.h"
#include "ui/base/ime/input_method_base.h"
namespace ui {
// A common InputMethod base implementation for Windows.
class COMPONENT_EXPORT(UI_BASE_IME_WIN) InputMethodWinBase
: public InputMethodBase {
public:
InputMethodWinBase(ImeKeyEventDispatcher* ime_key_event_dispatcher,
HWND attached_window_handle);
InputMethodWinBase(const InputMethodWinBase&) = delete;
InputMethodWinBase& operator=(const InputMethodWinBase&) = delete;
~InputMethodWinBase() override;
protected:
void OnDidChangeFocusedClient(TextInputClient* focused_before,
TextInputClient* focused) override;
ui::EventDispatchDetails DispatchKeyEvent(ui::KeyEvent* event) override;
// Returns true if the Win32 native window bound to |client| is considered
// to be ready for receiving keyboard input.
bool IsWindowFocused(const TextInputClient* client) const;
// For both WM_CHAR and WM_SYSCHAR
LRESULT OnChar(HWND window_handle,
UINT message,
WPARAM wparam,
LPARAM lparam,
const CHROME_MSG& event,
BOOL* handled);
// Some IMEs rely on WM_IME_REQUEST message even when TSF is enabled. So
// OnImeRequest (and its actual implementations as OnDocumentFeed,
// OnReconvertString, and OnQueryCharPosition) are placed in this base class.
LRESULT OnImeRequest(UINT message,
WPARAM wparam,
LPARAM lparam,
BOOL* handled);
LRESULT OnDocumentFeed(RECONVERTSTRING* reconv);
LRESULT OnReconvertString(RECONVERTSTRING* reconv);
LRESULT OnQueryCharPosition(IMECHARPOSITION* char_positon);
// Callback function for TextInputMethod::ProcessKeyEvent.
void ProcessKeyEventDone(ui::KeyEvent* event,
const std::vector<CHROME_MSG>* char_msgs,
bool is_handled);
ui::EventDispatchDetails ProcessUnhandledKeyEvent(
ui::KeyEvent* event,
const std::vector<CHROME_MSG>* char_msgs);
// For standard Chromium browser this should always be the top-level window.
// However for embedded Chromium windows this might be the embedder or the
// ancestor of the embedder.
const HWND attached_window_handle_;
// Represents if WM_CHAR[wparam=='\r'] should be dispatched to the focused
// text input client or ignored silently. This flag is introduced as a quick
// workaround against https://crbug.com/319100
// TODO(yukawa, IME): Figure out long-term solution.
bool accept_carriage_return_ = false;
// The new text direction and layout alignment requested by the user by
// pressing ctrl-shift. It'll be sent to the text input client when the key
// is released.
base::i18n::TextDirection pending_requested_direction_;
// Used for making callbacks.
base::WeakPtrFactory<InputMethodWinBase> weak_ptr_factory_{this};
private:
// Return false if |this| is destroyed during |PeekMessage| call.
bool HandlePeekMessage(HWND hwnd,
UINT msg_filter_min,
UINT msg_filter_max,
std::vector<CHROME_MSG>* char_msgs);
};
} // namespace ui
#endif // UI_BASE_IME_WIN_INPUT_METHOD_WIN_BASE_H_
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