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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_FPICKER_SOURCE_WIN32_FILEPICKER_PREVIEWCTRL_HXX
#define INCLUDED_FPICKER_SOURCE_WIN32_FILEPICKER_PREVIEWCTRL_HXX
#include <sal/types.h>
#include <rtl/ustring.hxx>
#include <comdef.h>
#include <memory>
// declaration
class CDimension
{
public:
CDimension( ) :
m_cx( 0 ),
m_cy( 0 )
{
}
CDimension( sal_Int32 cx, sal_Int32 cy ) :
m_cx( cx ),
m_cy( cy )
{
}
sal_Int32 m_cx;
sal_Int32 m_cy;
};
// we use OleInitialize here because we are calling
// some Ole functions to realize the picture preview
// and we expect to be called from the main thread
// so that there will be no problem calling
// OleInitialize (the main thread should be an STA)
// When OleInitialize should fail at worst the
// preview doesn't work
class CAutoOleInit
{
public:
// used to communicate ole
// initialization failures
class COleInitException { };
CAutoOleInit( )
{
HRESULT hr = OleInitialize( NULL );
if ( FAILED( hr ) )
throw COleInitException( );
}
~CAutoOleInit( )
{
OleUninitialize( );
}
};
// A simple file preview class to preview some
// common picture formats like *.gif, *jpg, etc.
// This class is not thread-safe and is
// implemented as singleton, because the class
// has only one static member to reconnect
// from callback functions
// we use a singleton-destroyer to get rid off
// the singleton instance, but this happens
// only on shutdown (unloading of the dll) -
// it's a question of taste (other solutions
// are possible)
class CFilePreview
{
public:
// to ensure only one instance (singleton)
static CFilePreview* createInstance(
HWND aParent,
POINT ulCorner,
const CDimension& aSize,
HINSTANCE hInstance,
sal_Bool bShow = sal_True,
sal_Bool bEnabled = sal_True );
// sets the size of the preview window
sal_Bool SAL_CALL setSize( const CDimension& aSize );
// returns the CDimension of the preview
sal_Bool SAL_CALL getSize( CDimension& theSize ) const;
// sets the position of the upper left corner
// of the preview window relative to the
// upper left corner of the parent window
sal_Bool SAL_CALL setPos( POINT ulCorner );
// returns the current position of the preview
// relative to the upper left corner of the
// parent window
sal_Bool SAL_CALL getPos( POINT& ulCorner ) const;
// enables or disables the preview window
// bEnable - true the window is enabled and updates its
// view when update is called
// bEnable - false the window shows itself in disabled
// mode and does not update its view when update is
// called
void SAL_CALL enable( sal_Bool bEnable );
// shows the preview window
// possible values see SHOW_STATE
sal_Bool SAL_CALL show( sal_Bool bShow );
// if the preview is shown and enabled
// preview of the given file will be shown
// returns true on success or false if an error
// occurred (the file in not there or not accessible etc.)
virtual sal_Bool SAL_CALL update( const OUString& aFileName );
protected:
// clients can create instances only through the static create method
CFilePreview(
HWND aParent,
POINT ulCorner,
const CDimension& aSize,
HINSTANCE hInstance,
sal_Bool bShow = sal_True,
sal_Bool bEnabled = sal_True );
// only the singleton destroyer class is allowed to delete the
// singleton instance of this class
virtual ~CFilePreview( );
// we use the stl unique_ptr class as singleton destroyer
typedef std::unique_ptr< CFilePreview > FILEPREVIEW_SINGLETON_DESTROYER_T;
protected:
virtual void SAL_CALL onPaint( HWND hWnd, HDC hDC );
sal_Bool loadFile( const OUString& aFileName );
private:
CAutoOleInit m_autoOleInit;
POINT m_pt;
CDimension m_dim;
HWND m_hwnd;
sal_Bool m_bEnabled;
IPicturePtr m_IPicture;
ATOM m_atomPrevWndClass;
HINSTANCE m_hInstance;
static LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
static CFilePreview* s_FilePreviewInst;
static FILEPREVIEW_SINGLETON_DESTROYER_T s_SingletonDestroyer;
private:
friend FILEPREVIEW_SINGLETON_DESTROYER_T;
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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