protected virtual void OnSelectedFolderChanged(
SelectedFolderChangedEventArgs args)
{
if (SelectedFolderChanged != null)
{
SelectedFolderChanged(this, args);
}
}
// ------------------------------------------------------------------
#endregion
#region Private methods.
// ------------------------------------------------------------------
private int extendedFolderBrowserDialogBrowseCallbackProc(
IntPtr hwnd,
int msg,
IntPtr lParam,
IntPtr lpData)
{
switch (msg)
{
case Win32.BFFM_INITIALIZED:
if (_selectedPath.Length != 0)
{
Win32.SendMessage(
new HandleRef(null, hwnd),
Win32.BFFM_SETSELECTION,
1,
_selectedPath);
//centerToScreen(hwnd);
_nativeWindow = new MyNativeWindow(this);
_nativeWindow.AssignHandle(hwnd);
}
break;
case Win32.BFFM_SELCHANGED:
{
//centerToScreen(hwnd);
var ptr1 = lParam;
if (ptr1 != IntPtr.Zero)
{
// --
if (_selectedPath.Length != 0)
{
// Work-around bug_ in Windows 7 that the selected item is not visible.
// http://connect.microsoft.com/VisualStudio/feedback/details/518103/bffm-setselection-does-not-work-with-shbrowseforfolder-on-windows-7
// http://stackoverflow.com/questions/7014190/why-is-enumchildwindows-skipping-children
// http://www.ureader.com/msg/14842617.aspx
// http://stackoverflow.com/questions/3660556/how-to-select-an-item-in-a-treeview-using-win32-api
var childWindows = GetChildWindows(hwnd);
if (childWindows.Count > 0)
{
var hWndTree = childWindows[0];
var treeItem =
Win32.SendMessage(
new HandleRef(null, hWndTree),
Win32.TVM_GETNEXTITEM,
Win32.TVGN_CARET,
0);
Win32.SendMessage(
new HandleRef(null, hWndTree),
Win32.TVM_ENSUREVISIBLE,
0,
treeItem);
}
}
// --
var ptr2 = Marshal.AllocHGlobal(260 * Marshal.SystemDefaultCharSize);
var flag1 = Win32.Shell32.SHGetPathFromIDList(ptr1, ptr2);
var folderPath = Marshal.PtrToStringAuto(ptr2);
Marshal.FreeHGlobal(ptr2);
var enable = flag1;
if (flag1)
{
var args =
new SelectedFolderChangedEventArgs(
ptr1,
folderPath);
OnSelectedFolderChanged(args);
enable = args.EnableOK;
}
Win32.SendMessage(
new HandleRef(null, hwnd),
Win32.BFFM_ENABLEOK,
0,
enable ? 1 : 0);
}
break;
}
}
return(0);
}
protected virtual void OnSelectedFolderChanged(
SelectedFolderChangedEventArgs args)
{
SelectedFolderChanged?.Invoke(this, args);
}
