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/*
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Licensed to the Software Freedom Conservancy (SFC) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The SFC licenses this file
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to you under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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     http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Author: [email protected]
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*/
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#ifndef WINAPIHANDLER_H_
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#define WINAPIHANDLER_H_
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#include <vector>
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#include <string>
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#include <utility>
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#include <windows.h>
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#include "imehandler.h"
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// a pair representing an entry as written in the windows registry:
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// HKL <-> Keyboard layout name
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typedef std::pair<std::string, std::string> keyboard_layout;
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class WinapiHandler : public ImeHandler {
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 public:
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  WinapiHandler();
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  virtual ~WinapiHandler() {}
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  virtual std::string GetToggleKeys() const;
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  virtual std::vector<std::string> GetLoadedEngines() const;
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  virtual std::vector<std::string> GetAvailableEngines() const;
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  virtual std::string GetNextEngineKeys() const;
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  virtual std::string GetActiveEngine() const;
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  virtual bool IsActivated() const;
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  virtual void Deactivate();
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  virtual int LoadEngines(const std::vector<std::string>& engines);
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  virtual bool ActivateEngine(const std::string& engine);
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  // The following is specific to this handler's implementation.
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  std::string GetSwitchingKeysForEngine(std::string engine);
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 protected:
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  std::vector<keyboard_layout> keyboard_layouts;
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  /* 
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   * Converts from HKL hexadecimal strings to human readable
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   * names and vice versa.
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   */
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  std::string GetLayoutName(std::string hkl) const;
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  std::string GetLayoutHkl(const std::string& name) const;
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  unsigned int GetHKLFromString(const std::string &) const;
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  /* 
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   * Reads the registry and loads all the available layouts
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   * and engines.
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   */
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  void LoadAvailableLayouts();
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  /*
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   * Return the key modifiers�@for the DWORD value usually
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   * taken as written in the registry.
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   */
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  std::string GetModifiers(DWORD value);
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};
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#endif  // WINAPIHANDLER_H_
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