// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.

// This interface should be returned by the application during command creation.
// For the purpose of this sample, it has a barebone implementation.
// Also the same command handler is returned for every command.
//

#pragma once

// This is a generic command handler used by every command in this sample.

//
//  CLASS: CCommandHandler : IUICommandHandler
//
//  PURPOSE: Implements interface IUICommandHandler. 
//
//  COMMENTS:
//
//    This is a generic command handler used by every command in this sample.
//    IUICommandHandler should be returned by the application during command creation.
//    For the purpose of this sample, it has a barebone implementation.
//    Also the same command handler is returned for every command.
//
class CCommandHandler : public IUICommandHandler // Command handlers must implement IUICommandHandler.
{
public:
	// Static method to create an instance of the object.
	static HRESULT CreateInstance(IUICommandHandler **ppCommandHandler);

	// IUnknown methods.
	STDMETHODIMP_(ULONG) AddRef();
	STDMETHODIMP_(ULONG) Release();
	STDMETHODIMP QueryInterface(REFIID iid, void** ppv);

	// IUICommandHandler methods
	STDMETHOD(UpdateProperty)(UINT nCmdID,
		REFPROPERTYKEY key,
		const PROPVARIANT* ppropvarCurrentValue,
		PROPVARIANT* ppropvarNewValue);

	STDMETHOD(Execute)(UINT nCmdID,
		UI_EXECUTIONVERB verb,
		const PROPERTYKEY* key,
		const PROPVARIANT* ppropvarValue,
		IUISimplePropertySet* pCommandExecutionProperties);

private:
	CCommandHandler() : m_cRef(1) {}
	LONG m_cRef;                        // Reference count.
};