/// <summary>Callback for Windows.</summary> /// <param name="hwnd">Window handle of the browse dialog box.</param> /// <param name="uMsg">Dialog box event that generated the statusMessage.</param> /// <param name="lParam">Value whose meaning depends on the event specified in uMsg.</param> /// <param name="lpData">Application-defined value that was specified in the lParam member of the BROWSEINFO structure used in the call to SHBrowseForFolder.</param> /// <returns> /// Returns 0 except in the case of BFFM_VALIDATEFAILED. For that flag, returns 0 to dismiss the dialog or nonzero to keep the dialog displayed. /// </returns> //[CLSCompliant(false)] private int OnBrowseEvent(IntPtr hwnd, BrowseForFolderMessages uMsg, IntPtr lParam, IntPtr lpData) { var messsage = uMsg; href = new HandleRef(this, hwnd); switch (messsage) { case BrowseForFolderMessages.BFFM_INITIALIZED: // Dialog is being initialized, so set the initial parameters if (!string.IsNullOrEmpty(Caption)) { SetWindowText(href, Caption); } if (!string.IsNullOrEmpty(SelectedItem)) { SendMessage(href, (uint)BrowseForFolderMessages.BFFM_SETSELECTIONW, (IntPtr)1, SelectedItem); } if (Expanded) { SendMessage(href, (uint)BrowseForFolderMessages.BFFM_SETEXPANDED, (IntPtr)1, rootPidl.DangerousGetHandle()); } if (!string.IsNullOrEmpty(OkText)) { SendMessage(href, (uint)BrowseForFolderMessages.BFFM_SETOKTEXT, (IntPtr)0, OkText); } Initialized?.Invoke(this, new FolderBrowserDialogInitializedEventArgs(hwnd)); initialized = true; return(0); case BrowseForFolderMessages.BFFM_SELCHANGED: try { if (!initialized || pidl?.DangerousGetHandle() == lParam) { return(0); } var tmpPidl = new PIDL(lParam, false, false); var str = GetNameForPidl(tmpPidl); if (string.IsNullOrEmpty(str)) { return(0); } SelectedItem = str; pidl = tmpPidl; } catch { return(0); } SelectedItemChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SelectedItem))); return(0); case BrowseForFolderMessages.BFFM_VALIDATEFAILEDA: case BrowseForFolderMessages.BFFM_VALIDATEFAILEDW: if (InvalidFolderSelected != null) { var folderName = messsage == BrowseForFolderMessages.BFFM_VALIDATEFAILEDA ? Marshal.PtrToStringAnsi(lParam) : Marshal.PtrToStringUni(lParam); var e = new InvalidFolderEventArgs(folderName, true); InvalidFolderSelected?.Invoke(this, e); return(e.DismissDialog ? 0 : 1); } return(0); default: return(0); } }
/// <summary> /// Callback for Windows. /// </summary> /// <param name="hwnd">Window handle of the browse dialog box.</param> /// <param name="uMsg">Dialog box event that generated the statusMessage.</param> /// <param name="lParam">Value whose meaning depends on the event specified in uMsg.</param> /// <param name="lpData">Application-defined value that was specified in the lParam member of the BROWSEINFO structure used in the call to SHBrowseForFolder.</param> /// <returns>Returns 0 except in the case of BFFM_VALIDATEFAILED. For that flag, returns 0 to dismiss the dialog or nonzero to keep the dialog displayed.</returns> //[CLSCompliant(false)] private int OnBrowseEvent(IntPtr hwnd, uint uMsg, IntPtr lParam, IntPtr lpData) { BrowseForFolderMessages messsage = (BrowseForFolderMessages)uMsg; switch (messsage) { case BrowseForFolderMessages.BFFM_INITIALIZED: // Dialog is being initialized, so set the initial parameters if (!String.IsNullOrEmpty(Caption)) { NativeMethods.SetWindowText(hwnd, Caption); } if (!String.IsNullOrEmpty(SelectedPath)) { NativeMethods.SendMessage(hwnd, (uint)BrowseForFolderMessages.BFFM_SETEXPANDED, (IntPtr)1, SelectedPath); NativeMethods.SendMessage(hwnd, (uint)BrowseForFolderMessages.BFFM_SETSELECTIONW, (IntPtr)1, SelectedPath); } if (!String.IsNullOrEmpty(OkText)) { NativeMethods.SendMessage(hwnd, (uint)BrowseForFolderMessages.BFFM_SETOKTEXT, (IntPtr)0, OkText); } if (Initialized != null) { EventHandler <FolderBrowserDialogInitializedEventArgs> h = Initialized; h(this, new FolderBrowserDialogInitializedEventArgs(hwnd)); } return(0); case BrowseForFolderMessages.BFFM_SELCHANGED: try { StringBuilder sb = new StringBuilder(260); if (lParam == IntPtr.Zero || 0 == NativeMethods.SHGetPathFromIDList(lParam, sb)) { return(0); } SelectedPath = sb.ToString(); } catch { return(0); } if (SelectedPathChanged != null) { PropertyChangedEventHandler h = SelectedPathChanged; h(this, new PropertyChangedEventArgs("SelectedPath")); } return(0); case BrowseForFolderMessages.BFFM_VALIDATEFAILEDA: case BrowseForFolderMessages.BFFM_VALIDATEFAILEDW: if (InvalidFolderSelected != null) { string folderName; if (messsage == BrowseForFolderMessages.BFFM_VALIDATEFAILEDA) { folderName = Marshal.PtrToStringAnsi(lParam); } else { folderName = Marshal.PtrToStringUni(lParam); } EventHandler <InvalidFolderEventArgs> h = InvalidFolderSelected; InvalidFolderEventArgs e = new InvalidFolderEventArgs(folderName, true); h(this, e); return(e.DismissDialog ? 0 : 1); } return(0); default: return(0); } }