/// <summary>
/// Defines the common dialog box hook procedure that is overridden to add specific functionality to a common dialog box.
/// </summary>
/// <returns>
/// A zero value if the default dialog box procedure processes the message; a nonzero value if the default dialog box procedure ignores the message.
/// </returns>
/// <param name="hWnd">The handle to the dialog box window. </param><param name="msg">The message being received. </param><param name="wparam">Additional information about the message. </param><param name="lparam">Additional information about the message. </param>
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));
int results = ProcessNotifyMessage(hWnd, notifyData);
if (results != 0)
{
InteropUtil.SetWindowLongW(hWnd, InteropUtil.DWL_MSGRESULT, results);
return((IntPtr)results);
}
break;
}
case InteropUtil.WM_SIZE:
{
ResizeCustomControl(hWnd);
break;
}
case (InteropUtil.BN_CLICKED << 16) | InteropUtil.IDOK:
{
break;
}
case InteropUtil.WM_COMMAND:
{
unchecked
{
IntPtr hParent = InteropUtil.AssumeNonZero(InteropUtil.GetParent(hWnd));
uint code = HIGH((uint)wParam);
uint 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.
InteropUtil.SendMessage(hParent, InteropUtil.WM_CLOSE, 0, 0);
break;
}
case InteropUtil.ID_SELECT:
{
if (ProcessSelection(hParent, true))
{
InteropUtil.SendMessage(hParent, 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.
InteropUtil.SendMessage
(hParent,
InteropUtil.WM_COMMAND,
(InteropUtil.BN_CLICKED << 16) | InteropUtil.IDOK,
unchecked ((uint)InteropUtil.GetDlgItem(hParent, InteropUtil.IDOK))
);
break;
}
}
}
}
break;
}
}
return(base.HookProc(hWnd, msg, wParam, lparam));
}
