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// Copyright (c) 2011 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_BASE_IME_INPUT_METHOD_FACTORY_H_
#define UI_BASE_IME_INPUT_METHOD_FACTORY_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "ui/base/ime/input_method_initializer.h"
#include "ui/base/ui_export.h"
#include "ui/gfx/native_widget_types.h"
template <typename T> struct DefaultSingletonTraits;
namespace ui {
namespace internal {
class InputMethodDelegate;
} // namespace internal
class InputMethod;
class UI_EXPORT InputMethodFactory {
public:
// Returns the current active factory.
// If no factory was set, sets the DefaultInputMethodFactory by default. Once
// a factory was set, you cannot change the factory, and always the same
// factory is returned.
static InputMethodFactory* GetInstance();
// Sets an InputMethodFactory to be used.
// This function must be called at most once. |instance| is not owned by this
// class or marked automatically as a leaky object. It's a caller's duty to
// destroy the object or mark it as leaky.
static void SetInstance(InputMethodFactory* instance);
virtual ~InputMethodFactory() {}
// Creates and returns an input method implementation.
virtual scoped_ptr<InputMethod> CreateInputMethod(
internal::InputMethodDelegate* delegate,
gfx::AcceleratedWidget widget) = 0;
private:
static void ClearInstance();
friend UI_EXPORT void ShutdownInputMethod();
friend UI_EXPORT void ShutdownInputMethodForTesting();
};
class DefaultInputMethodFactory : public InputMethodFactory {
public:
// For Singleton
static DefaultInputMethodFactory* GetInstance();
// Overridden from InputMethodFactory.
virtual scoped_ptr<InputMethod> CreateInputMethod(
internal::InputMethodDelegate* delegate,
gfx::AcceleratedWidget widget) OVERRIDE;
private:
DefaultInputMethodFactory() {}
friend struct DefaultSingletonTraits<DefaultInputMethodFactory>;
DISALLOW_COPY_AND_ASSIGN(DefaultInputMethodFactory);
};
class MockInputMethodFactory : public InputMethodFactory {
public:
// For Singleton
static MockInputMethodFactory* GetInstance();
// Overridden from InputMethodFactory.
virtual scoped_ptr<InputMethod> CreateInputMethod(
internal::InputMethodDelegate* delegate,
gfx::AcceleratedWidget widget) OVERRIDE;
private:
MockInputMethodFactory() {}
friend struct DefaultSingletonTraits<MockInputMethodFactory>;
DISALLOW_COPY_AND_ASSIGN(MockInputMethodFactory);
};
// Shorthand for
// InputMethodFactory::GetInstance()->CreateInputMethod(delegate, widget).
UI_EXPORT scoped_ptr<InputMethod> CreateInputMethod(
internal::InputMethodDelegate* delegate,
gfx::AcceleratedWidget widget);
// Shorthand for InputMethodFactory::SetInstance(new MockInputMethodFactory()).
// TODO(yukishiino): Retires this shorthand, and makes ui::InitializeInputMethod
// and ui::InitializeInputMethodForTesting set the appropriate factory.
UI_EXPORT void SetUpInputMethodFactoryForTesting();
#if defined(OS_WIN)
// Returns a shared input method object for the platform. Caller must not
// delete the object. Currently supported only on Windows. This method is
// for non-Aura environment, where only one input method object is created for
// the browser process.
UI_EXPORT InputMethod* GetSharedInputMethod();
namespace internal {
// Destroys the shared input method object returned by GetSharedInputMethod().
// This function must be called only from input_method_initializer.cc.
void DestroySharedInputMethod();
} // namespace internal
#endif
} // namespace ui;
#endif // UI_BASE_IME_INPUT_METHOD_FACTORY_H_
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