/// <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);
}
}
