Viewing file:  BrowseForFolder.cpp (8.8 KB) -rw-rw-rw-
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//////////////////////////////////////////////////////////////////////
//
// ShellBrowser.cpp: implementation of the CShellBrowser class.
//
#include "stdafx.h"
#include "BrowseForFolder.h"
#if defined(_DEBUG) && !defined(MMGR)
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
//
// Construction/Destruction
//
CBrowseForFolder::CBrowseForFolder(const HWND hParent /*= NULL*/, const LPITEMIDLIST pidl /*= NULL*/, const int nTitleID /*= 0*/)
{
m_hwnd = NULL;
SetOwner(hParent);
SetRoot(pidl);
SetTitle(nTitleID);
m_bi.lpfn = BrowseCallbackProc;
m_bi.lParam = reinterpret_cast<long>(this);
m_bi.pszDisplayName = m_szSelected;
m_szSelected[0] = 0;
}
CBrowseForFolder::CBrowseForFolder(const HWND hParent, const LPITEMIDLIST pidl, const CString& strTitle)
{
m_hwnd = NULL;
SetOwner(hParent);
SetRoot(pidl);
SetTitle(strTitle);
m_bi.lpfn = BrowseCallbackProc;
m_bi.lParam = reinterpret_cast<long>(this);
m_bi.pszDisplayName = m_szSelected;
m_szSelected[0] = 0;
}
CBrowseForFolder::~CBrowseForFolder()
{
}
//////////////////////////////////////////////////////////////////////
//
// Implementation
//
void CBrowseForFolder::SetOwner(const HWND hwndOwner)
{
if (m_hwnd != NULL)
return;
m_bi.hwndOwner = hwndOwner;
}
void CBrowseForFolder::SetRoot(const LPITEMIDLIST pidl)
{
if (m_hwnd != NULL)
return;
m_bi.pidlRoot = pidl;
}
CString CBrowseForFolder::GetTitle() const
{
return m_bi.lpszTitle;
}
void CBrowseForFolder::SetTitle(const CString& strTitle)
{
if (m_hwnd != NULL)
return;
m_pchTitle=strTitle;
m_bi.lpszTitle = m_pchTitle;
}
bool CBrowseForFolder::SetTitle(const int nTitle)
{
if (nTitle <= 0)
return false;
CString strTitle;
if(!strTitle.LoadString(static_cast<size_t>(nTitle)))
{
return false;
}
SetTitle(strTitle);
return true;
}
void CBrowseForFolder::SetFlags(const UINT ulFlags)
{
if (m_hwnd != NULL)
return;
m_bi.ulFlags = ulFlags;
}
CString CBrowseForFolder::GetSelectedFolder() const
{
return m_szSelected;
}
bool CBrowseForFolder::SelectFolder()
{
bool bRet = false;
LPITEMIDLIST pidl;
if ((pidl = ::SHBrowseForFolder(&m_bi)) != NULL)
{
m_strPath.Empty();
if (::SHGetPathFromIDList(pidl, m_szSelected))
{
bRet = true;
m_strPath = m_szSelected;
}
LPMALLOC pMalloc;
//Retrieve a pointer to the shell's IMalloc interface
if (SUCCEEDED(SHGetMalloc(&pMalloc)))
{
// free the PIDL that SHBrowseForFolder returned to us.
pMalloc->Free(pidl);
// release the shell's IMalloc interface
(void)pMalloc->Release();
}
}
m_hwnd = NULL;
return bRet;
}
void CBrowseForFolder::OnInit() const
{
}
void CBrowseForFolder::OnSelChanged(const LPITEMIDLIST pidl) const
{
(void)pidl;
}
void CBrowseForFolder::EnableOK(const bool bEnable) const
{
if (m_hwnd == NULL)
return;
(void)SendMessage(m_hwnd, BFFM_ENABLEOK, NULL, static_cast<WPARAM>(bEnable));
}
void CBrowseForFolder::SetSelection(const LPITEMIDLIST pidl) const
{
if (m_hwnd == NULL)
return;
(void)SendMessage(m_hwnd, BFFM_SETSELECTION, FALSE, reinterpret_cast<long>(pidl));
}
void CBrowseForFolder::SetSelection(const CString& strPath) const
{
if (m_hwnd == NULL)
return;
(void)SendMessage(m_hwnd, BFFM_SETSELECTION, TRUE, reinterpret_cast<long>(LPCTSTR(strPath)));
}
void CBrowseForFolder::SetStatusText(const CString& strText) const
{
if (m_hwnd == NULL)
return;
CString oPathString = FormatLongPath(strText);
(void)SendMessage(m_hwnd, BFFM_SETSTATUSTEXT, NULL,
reinterpret_cast<long>(LPCTSTR(oPathString/*strText*/)));
}
int __stdcall CBrowseForFolder::BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM lpData)
{
CBrowseForFolder* pbff = reinterpret_cast<CBrowseForFolder*>(lpData);
pbff->m_hwnd = hwnd;
if (uMsg == BFFM_INITIALIZED)
pbff->OnInit();
else if (uMsg == BFFM_SELCHANGED)
pbff->OnSelChanged(reinterpret_cast<LPITEMIDLIST>(lParam));
return 0;
}
/*************************
3. Finally, the body of FormatLongPath looks like that:
**************************/
CString CBrowseForFolder::FormatLongPath(CString oLongPath) const
{
//will be passed instead of original
CString oModifString( oLongPath );
//will be used to get measurements
CWnd oWnd;
if( !oModifString.IsEmpty() && IsWindow(m_hwnd) && oWnd.Attach(m_hwnd) )
{
//margins must be considered
RECT Rect = { 0, 0, 7, 0 }; //my lucky guess the margin would be seven units. It used to be 7 in resource editor, so why not here?
int nMargin = MapDialogRect( m_hwnd, &Rect ) ? Rect.right : 20; //convert into pixels then
//measure the width first
CRect oClientRect;
oWnd.GetClientRect( &oClientRect );
oClientRect.NormalizeRect();
int nMaxTextWidth = oClientRect.Width() - nMargin*2;
CClientDC oClientDC(&oWnd);
//trying to determine the system metrix to create apropriate fonts for measurement
NONCLIENTMETRICS NonClientMetrics;
NonClientMetrics.cbSize = sizeof(NONCLIENTMETRICS);
BOOL bSystemMetrics = SystemParametersInfo( SPI_GETNONCLIENTMETRICS,
NonClientMetrics.cbSize,
&NonClientMetrics,
0 );
if( bSystemMetrics )
{
CFont oMessageFont;//lets create the fonts same as the selected Message Font on the Display/Appearance tab
if( oMessageFont.CreateFontIndirect(&NonClientMetrics.lfMessageFont) )
{
oClientDC.SelectObject( &oMessageFont );
}
}
else
{
oClientDC.SelectStockObject( SYSTEM_FONT ); //it MUST NOT happen, but in case...
}
//measure the actual text width
int nTextWidth = oClientDC.GetTextExtent( oModifString ).cx;
//to check whether it's correct uncoment below and change directory few times...
//oClientDC.SelectStockObject( BLACK_PEN );
//oClientDC.Rectangle( 0, 0, nMargin, nMargin*5 );
//oClientDC.Rectangle( nMaxTextWidth+nMargin, 0, oClientRect.Width(), nMargin*5 );
//oClientDC.Rectangle( nMargin, 0, nMaxTextWidth+nMargin, nMargin );
//oClientDC.TextOut( nMargin, 0, oModifString );
//after all this measurements time to do the real job
if( nTextWidth > nMaxTextWidth )
{
int nRootDirIndex, nLastDirIndex;
//this is the testing line:
//oModifString = "\\\\computer_name\\dir1\\subdir1" + oModifString.Right(oModifString.GetLength() - 2 );
nRootDirIndex = oModifString.Find( '\\' );
nLastDirIndex = oModifString.ReverseFind( '\\' );
if( nRootDirIndex == 0 ) //we have to deal with the network 'drive', which would look like that: \\computer_name\dir1\subdir1
{
nRootDirIndex = oModifString.Find( '\\', nRootDirIndex+1 );
if( nRootDirIndex != -1 )
{
nRootDirIndex = oModifString.Find( '\\', nRootDirIndex+1 );
}
}
if( nRootDirIndex != -1 && nLastDirIndex != -1 )
{
nRootDirIndex += 1; //increase for the tactical reasons
CString oDottedText( "..." );//this three dots will be used to indicate the cut part of the path
CString oRootDirectory; //this can be cut as the last one
CString oMidDirectoryPart; //we will try to shorten this part first
CString oLastDirectory; //and then, if still too long we'll cut this one
oRootDirectory = oModifString.Left( nRootDirIndex );
oMidDirectoryPart = oModifString.Mid( nRootDirIndex, nLastDirIndex - nRootDirIndex );
oLastDirectory = oModifString.Mid( nLastDirIndex );
while( nTextWidth > nMaxTextWidth )
{
int nMidPartLenght = oMidDirectoryPart.GetLength();
oModifString = oRootDirectory + oMidDirectoryPart + oDottedText + oLastDirectory;
//measure the actual text width again
nTextWidth = oClientDC.GetTextExtent( oModifString ).cx;
if( nMidPartLenght > 0 )
{
//prepare for the next loop (if any)
oMidDirectoryPart = oMidDirectoryPart.Left(oMidDirectoryPart.GetLength() - 1 );
}
else
{
int nLastDirectoryLenght = oLastDirectory.GetLength();
if( nLastDirectoryLenght > 0 )
{
//prepare for the next loop (if any)
oLastDirectory = oLastDirectory.Right(oLastDirectory.GetLength() - 1 );
}
else
{
//should not come here, what size of the fonts are you using?!
//anyway, we will do different now, cutting from the end...
int nRootDirectoryLenght = oRootDirectory.GetLength();
if( nRootDirectoryLenght > 0 )
{
oRootDirectory = oRootDirectory.Left(oRootDirectory.GetLength() - 1 );
}
else
{
TRACE0( "Mayday, Mayday!!!\n" );
oModifString = oLongPath;
//something wrong, give me a...
break;
}
}
}
}//end while
}
}
oWnd.Detach();
}
return oModifString;
}
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