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// DirDialog.cpp - implements class CDirDialog // The CDirDialog class implements a directory selection dialog by deriving from the file // selection dialog class (CFileDialog). This dialog has the advantages of the standard // file open dialog (resizeable, ability to create/delete directories etc) but is // customized for the selection of a directory rather than a file. // // USER INTERFACE // -------------- // // For example, the user can double click on a directory name or type it into the // edit control to open it in the directory listing display. To say that this is // the directory they want the user must click the "Open" button. When the user // enters a backslash (\) as the last character in the edit control the display is // changed to show the contents of the directory if it exists. The same is done if // the user presses the Enter key except that if the directory does not exist the // user is asked if they want to create it. // // When the user enters other characters and the contents don't end in a backslash // then automatic directory name completion is attempted. If the contents of the // edit box are the first character(s) of one unique existing directory then the // rest of the directory name is added to the end of the edit box. These characters // are selected so that the user can type something else and it they will be ignored. // // When selecting a directory you would normally not want to see files, but you may on // occasion. The normal "Files of Type:" drop down list is available but it has an // extra entry "Show Folders Only" that is selected by default. When files are // displayed double clicking of them is ignored (unlike the normal File Open dialog). // Double-clicking a directory name changes to that directory as normal. // // PROGRAMMER INTERFACE // -------------------- // // Add DirDialog.cpp and DirDialog.h to your project. Include DirDialog.h // in the source file(s) where you want to use the CDirDialog class. // // Create a CDirDialog object using the constructor described below. If necessary // you may then modify values in the m_ofn member of the CFileDialog base class // (see the Win32 documentation for OPENFILENAME). For example, to change the // text that appears in the title bar of the dialog use m_ofn.lpstrTitle. // // Call DoModal() to activate the dialog. If DoModal() return IDOK you can then // call GetPath() to obtain the name of the directory that the user selected. // // // CDirDialog::CDirDialog(LPCTSTR lpstrInitialDir = NULL, // LPCTSTR lpszFilter = NULL, CWnd* pParentWnd = NULL); // // lpstrInitialDir // The initial directory. If NULL then the current directory is used. // See lpstrInitialDir in the Win32 documentation for OPENFILENAME for more info. // // lpszFilter // The string pairs that specify the file filters to use. See lpszFilter // in the documentation for the CFileDialog constructor for more info. // Note that an extra entry is always added that allows the user to hide the // display of all files. If NULL is used (the default) then only the // "no files" entry and an "all files" entry are provided. // // pParentWnd // A pointer to the dialog parent window. // // virtual int CDirDialog::DoModal() // // see CFileDialog::DoModal(). // // CString CDirDialog::GetPath() // // return value // The full path name chosen by the user. // // Example: // // // Called when the Browse button is clicked in CMyDialog // void CMyDialog::OnBrowseDir() // { // if (!UpdateData(TRUE)) // Update current value of m_dir from control // return; // // CDirDialog dlg(m_dir, // "JPEG Files (*.jpg; *.jpeg)|*.jpg;*.jpeg|All Files (*.*)|*.*||", // this); // dlg.m_ofn.lpstrTitle = "Select Folder to Store Images"; // // if (dlg.DoModal() == IDOK) // { // m_dir = dlg.GetPath(); // Store selected directory name back into the control // UpdateData(FALSE); // } // } // // // INTERNAL DESIGN // --------------- // // The following changes are made to the controls in the standard file open dialog: // // The "Open" button is hidden and replaced with another button (IDC_OPEN). // The normal edit control (edt1) where the file name is entered is hidden and replaced // by a "subclassed" edit control (IDC_DIR) of class CDirEdit (derived from CEdit). // By hiding and replacing these controls we can manipulate the behaviour // of the dialog in ways not provided for in any other way. For example, by changing // the contents of the hidden edit control (edt1) and simulating a click of the hidden // Open button (IDOK) we can force the contents of a directory to be displayed. // // An extra entry is added to the file types drop down combo called "Show Folders Only" // that causes no files to be displayed. (If no filters are supplied at all by using // the default value of NULL, then an "All Files" filter type is also added.) // The filter string is a single dot (full-stop) which will match no files. // // The new edit control (IDC_DIR) is subclassed so that the contents are monitored and // the some keys can be intercepted. When the contents are changed and they end with // a backslash the current display is changed to point to the directory entered (if it // exists). When return is pressed the directory is also changed, but if it doesn't // exist then the user is asked if he wants to create it. The way the directory is // changed (ie. the files of that directory are shown in the display) is by putting the // directory name into the original edit control (edt1) and simulating a click of the // original Open button (IDOK). Directory name completion is also performed as the // user types in a directory name. // // The IDC_OPEN button is used as a replacement for the IDOK button while still allowing // the hidden IDOK button to be used to change the displayed directory. // // The CDirDialog class is derived from CFileDialog. The following base class members // are overridden: // - OnInitDone: so that the dialog controls can be reorganized // - OnFolderChange: so that when the user clicks on a folder name the edit control can // be updated to reflect the name of the currently selected directory // - OnFileNameOK: always returns TRUE so that the user can't select files by // double-clicking them (this is a DIRECTORY selection dialog after all) #include "stdafx.h" // If you don't want this as part of your project (eg to put in a library) remove // the above #include "stdafx.h" and uncomment the following 3 lines: //#define VC_EXTRALEAN // Exclude rarely-used stuff from Windows headers //#include <afxwin.h> // MFC core and standard components //#include <afxext.h> // MFC extensions #include <Dlgs.h> // For file dialog control IDs #include <imagehlp.h> // For ::MakeSureDirectoryPathExists() #include "DirDialog.h" // Our own header file #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define IDC_DIR 181 // New edit control for entering the directory name #define IDC_OPEN 182 // New "Open" button // Class CDlgWnd BEGIN_MESSAGE_MAP(CDlgWnd, CWnd) ON_BN_CLICKED(IDC_OPEN, OnOpen) END_MESSAGE_MAP() void CDlgWnd::OnOpen() { // Get the text and check whether it is a valid directory CString ss; CEdit *pEdit = (CEdit *)GetDlgItem(IDC_DIR); ASSERT(pEdit != NULL); pEdit->GetWindowText(ss); int len = ss.GetLength(); if (len == 2 && ss[0] == '\\' && ss[1] == '\\') { AfxMessageBox(ss + _T("\nThis is not a va