/****************************** Module Header ******************************\
Module Name:  PreviewHandler.h
Copyright (c) Microsoft Corporation.

This source is subject to the Microsoft Public License.
See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.
All other rights reserved.

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.
\***************************************************************************/

#pragma once

#include <windows.h>
#include <shlobj.h>
#include <thumbcache.h>


class PreviewHandler : 
  public IInitializeWithFile,
  public IPreviewHandler, 
  public IPreviewHandlerVisuals, 
  public IOleWindow, 
  public IObjectWithSite
{
public:
  // IUnknown
  IFACEMETHODIMP QueryInterface(REFIID riid, void **ppv);
  IFACEMETHODIMP_(ULONG) AddRef();
  IFACEMETHODIMP_(ULONG) Release();

  // IInitializeWithFile
  IFACEMETHODIMP Initialize(LPCWSTR pszFilePath, DWORD grfMode);

  // IPreviewHandler
  IFACEMETHODIMP SetWindow(HWND hwnd, const RECT *prc);
  IFACEMETHODIMP SetFocus();
  IFACEMETHODIMP QueryFocus(HWND *phwnd);
  IFACEMETHODIMP TranslateAccelerator(MSG *pmsg);
  IFACEMETHODIMP SetRect(const RECT *prc);
  IFACEMETHODIMP DoPreview();
  IFACEMETHODIMP Unload();

  // IPreviewHandlerVisuals (Optional)
  IFACEMETHODIMP SetBackgroundColor(COLORREF color);
  IFACEMETHODIMP SetFont(const LOGFONTW *plf);
  IFACEMETHODIMP SetTextColor(COLORREF color);

  // IOleWindow
  IFACEMETHODIMP GetWindow(HWND *phwnd);
  IFACEMETHODIMP ContextSensitiveHelp(BOOL fEnterMode);

  // IObjectWithSite
  IFACEMETHODIMP SetSite(IUnknown *punkSite);
  IFACEMETHODIMP GetSite(REFIID riid, void **ppv);

  PreviewHandler();

protected:
  ~PreviewHandler();

private:
  // Reference count of component.
  long m_cRef;

  // Provided during initialization.
  LPWSTR m_pPathFile;

  // Parent window that hosts the previewer window.
  // Note: do NOT DestroyWindow this.
  HWND m_hwndParent;

  // Bounding rect of the parent window.
  RECT m_rcParent;

  // The actual previewer window.
  HWND m_hwndPreview;

  // Site pointer from host, used to get IPreviewHandlerFrame.
  IUnknown *m_punkSite;
};

HWND CreatePreviewWindow(HWND hParent, int width, int height, const char* filename);