protected override IntPtr HookProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lparam)
{
switch (unchecked((uint)msg))
{
case InteropUtil.WM_INITDIALOG:
{
InitDialog(hWnd);
break;
}
case InteropUtil.WM_NOTIFY:
{
var notifyData = (InteropUtil.OFNOTIFY)Marshal.PtrToStructure(lparam, typeof(InteropUtil.OFNOTIFY));
var results = ProcessNotifyMessage(hWnd, notifyData);
if (results != 0)
{
hWnd.SetWindowLongW(InteropUtil.DWL_MSGRESULT, results);
return (IntPtr)results;
}
break;
}
case InteropUtil.WM_SIZE:
{
ResizeCustomControl(hWnd);
break;
}
case InteropUtil.WM_COMMAND:
{
unchecked
{
var hParent = hWnd.GetParent().AssumeNonZero();
var code = HIGH((uint)wParam);
var id = LOW((uint)wParam);
if (code == InteropUtil.BN_CLICKED)
{
switch (id)
{
case InteropUtil.ID_CUSTOM_CANCEL:
{
//The user clicked our custom cancel button. Close the dialog.
hParent.SendMessage(InteropUtil.WM_CLOSE, 0, 0);
break;
}
case InteropUtil.ID_SELECT:
{
var hFileName = hParent.GetDlgItem(InteropUtil.ID_FileNameCombo);
var currentText = (hFileName.GetWindowTextW() ?? "").Trim();
if (currentText == "" && !String.IsNullOrEmpty(m_currentFolder))
{
//there's not text in the box, so the user must want to select the current folder.
m_useCurrentDir = true;
hParent.SendMessage(InteropUtil.WM_CLOSE, 0, 0);
break;
}
else if (System.IO.Path.IsPathRooted(currentText))
{
if (Directory.Exists(currentText))
{
//the contents of the text box are a rooted path, that points to an existing directory.
//we interpret that to mean that the user wants to select that directory.
m_useCurrentDir = true;
m_currentFolder = currentText;
hParent.SendMessage(InteropUtil.WM_CLOSE, 0, 0);
break;
}
}
else if (!String.IsNullOrEmpty(m_currentFolder) && currentText != "")
{
var combined = System.IO.Path.Combine(m_currentFolder, currentText);
if (Directory.Exists(combined))
{
//the contents of the text box are a relative path, that points to a
//an existing directory. We interpret the users intent to mean that they wanted
//to select the existing path.
m_useCurrentDir = true;
m_currentFolder = combined;
hParent.SendMessage(InteropUtil.WM_CLOSE, 0, 0);
break;
}
}
//The user has not selected an existing folder.
//So we translate a click of our "Select" button into the OK button and forward the request to the
//open file dialog.
hParent.SendMessage
(
InteropUtil.WM_COMMAND,
(InteropUtil.BN_CLICKED << 16) | InteropUtil.IDOK,
unchecked((uint)hParent.GetDlgItem(InteropUtil.IDOK))
);
break;
}
}
}
}
break;
}
}
return base.HookProc(hWnd, msg, wParam, lparam);
}