/// <summary>
/// Callback method for the handling of messages to be sent to/from the folder browser dialog.
/// </summary>
/// <param name="hwnd"></param>
/// <param name="msg"></param>
/// <param name="lParam"></param>
/// <param name="lpData"></param>
/// <returns></returns>
private int FolderBrowserDialog_BrowseCallbackProc(IntPtr hwnd, int msg, IntPtr lParam, IntPtr lpData)
{
switch (msg)
{
case NativeWindowCommon.BFFM_INITIALIZED:
// We get in here when the dialog is first displayed. If an initial directory
// has been specified we will make this the selection now, and also make sure
// that directory is expanded.
if (this.selectedPath.Length != 0)
{
NativeWindowCommon.SendMessage(hwnd, NativeWindowCommon.BFFM_SETSELECTIONW, 1, this.selectedPath);
}
break;
case NativeWindowCommon.BFFM_SELCHANGED:
{
IntPtr pidl = lParam;
if (pidl != IntPtr.Zero)
{
StringBuilder sb = new StringBuilder(MAX_PATH * Marshal.SystemDefaultCharSize);
bool flag = NativeWindowCommon.SHGetPathFromIDList(pidl, sb);
NativeWindowCommon.SendMessage(hwnd, NativeWindowCommon.BFFM_ENABLEOK, 0, flag ? 1 : 0);
}
if (!doneScrolling)
{
IntPtr hbrowse = NativeWindowCommon.FindWindowEx(hwnd, IntPtr.Zero, "SHBrowseForFolder ShellNameSpace Control", null);
IntPtr htree = NativeWindowCommon.FindWindowEx(hbrowse, IntPtr.Zero, "SysTreeView32", null);
IntPtr htis = NativeHeader.SendMessage(htree, NativeWindowCommon.TVM_GETNEXTITEM, NativeWindowCommon.TVGN_CARET, IntPtr.Zero);
IntPtr htir = NativeHeader.SendMessage(htree, NativeWindowCommon.TVM_GETNEXTITEM, NativeWindowCommon.TVGN_ROOT, IntPtr.Zero);
IntPtr htic = NativeHeader.SendMessage(htree, NativeWindowCommon.TVM_GETNEXTITEM, NativeWindowCommon.TVGN_CHILD, htir);
//we actually go into the BFFM_SELCHANGED case three times when the dialog is first shown, and it's only on the third one that we actually scroll,
//since before this htic is always zero, so you need to cope with this
//- i.e. don't set 'doneScrolling' flag until htic has been non - zero(or until you've gone into the BFFM_SELCHANGED three times).
if ((int)htic != 0)
{
doneScrolling = true;
//The only solution I've found that works consistently is to send a TVM_ENSUREVISIBLE to the tree, using TVM_GETNEXTITEM/TVGN_CARET, from BFFM_SELCHANGED.
//That works. Every time.
NativeHeader.SendMessage(htree, NativeWindowCommon.TVM_ENSUREVISIBLE, 0, htis);
//Active the tree view control window inside the folder browser dialog to set the focus on it.
NativeWindowCommon.SendMessage(htree, NativeWindowCommon.WM_ACTIVATE, 1, 0);
}
}
}
break;
}
return(0);
}
/// <summary>
/// Update the control parameter's styles.
/// </summary>
private void UpdateControlStyles()
{
int fStyle = NativeHeader.GetWindowLong(Handle, NativeHeader.GWL_EXSTYLE);
if (BorderStyle == BorderStyle.FixedSingle)
{
// remove the Fixed3D border style
fStyle &= ~NativeWindowCommon.WS_EX_CLIENTEDGE;
InvalidateNC();
}
if (isTransparent)
{
fStyle |= NativeHeader.WS_EX_TRANSPARENT;
}
else
{
fStyle &= ~NativeHeader.WS_EX_TRANSPARENT;
}
NativeWindowCommon.SetWindowLong(Handle, NativeHeader.GWL_EXSTYLE, fStyle);
fStyle = NativeHeader.GetWindowLong(Handle, NativeHeader.GWL_STYLE);
if (base.RightToLeft == RightToLeft.Yes)
{
fStyle |= NativeHeader.WS_EX_LTRREADING;
fStyle |= NativeHeader.WS_EX_RIGHT;
fStyle |= NativeHeader.WS_EX_LEFTSCROLLBAR;
}
else if (base.RightToLeft == RightToLeft.No)
{
fStyle |= NativeHeader.WS_EX_RTLREADING;
fStyle |= NativeHeader.WS_EX_LEFT;
fStyle |= NativeHeader.WS_EX_RIGHTSCROLLBAR;
}
NativeWindowCommon.SetWindowLong(Handle, NativeHeader.GWL_STYLE, fStyle);
}
protected int WndProc(ref Message m)
#endif
{
MouseEventArgs mouseEvents;
switch (m.Msg)
{
#if !PocketPC
case NativeWindowCommon.CBN_DROPDOWN:
{
if (OriginalDropDownWindowProc == IntPtr.Zero)
{
NativeWindowCommon.COMBOBOXINFO comboBoxInfo = new NativeWindowCommon.COMBOBOXINFO();
// alloc ptrComboBoxInfo
IntPtr ptrComboBoxInfo = Marshal.AllocHGlobal(Marshal.SizeOf(comboBoxInfo));
try
{
//get combo Box Info
comboBoxInfo.cbSize = (IntPtr)Marshal.SizeOf(comboBoxInfo);
Marshal.StructureToPtr(comboBoxInfo, ptrComboBoxInfo, true);
IntPtr intptr = NativeHeader.SendMessage(this.Handle, NativeWindowCommon.CB_GETCOMBOBOXINFO, 0, ptrComboBoxInfo);
//CB_GETCOMBOBOXINFO : If the send message succeeds, the return value is nonzero.
int returnValue = intptr.ToInt32();
if (returnValue > 0)
{
// get the info from ptrComboBoxInfo to comboBoxInfo
comboBoxInfo = (NativeWindowCommon.COMBOBOXINFO)Marshal.PtrToStructure(ptrComboBoxInfo, typeof(NativeWindowCommon.COMBOBOXINFO));
// save hwnd drop down list
HwndDropDownList = comboBoxInfo.hwndList;
//replace the window proc of the drop down list
CustomDropDownWindowProc = new ControlWndProc(DropDownWindowProc);
// save the original drop down list (most be member in the class so the garbig collection will not free it)
OriginalDropDownWindowProc = (IntPtr)NativeWindowCommon.SetWindowLong(HwndDropDownList,
NativeWindowCommon.GWL_WNDPROC, Marshal.GetFunctionPointerForDelegate(CustomDropDownWindowProc).ToInt32());
}
else
{
Debug.Assert(false);
}
}
finally
{
// free the ptrComboBoxInfo
Marshal.FreeHGlobal(ptrComboBoxInfo);
}
}
}
break;
#endif
case NativeWindowCommon.WM_LBUTTONDOWN:
case NativeWindowCommon.WM_LBUTTONDBLCLK:
if (!this.DroppedDown)
{
// prevent drop down on combo - to prevent combo openning on non parkable controls
// - it must be handled manually
mouseEvents = new MouseEventArgs(MouseButtons.Left, 0,
NativeWindowCommon.LoWord((int)m.LParam), NativeWindowCommon.HiWord((int)m.LParam), 0);
this.OnMouseDown(mouseEvents);
// provide doubleclick event
#if !PocketPC
if (m.Msg == NativeWindowCommon.WM_LBUTTONDBLCLK)
{
this.OnMouseDoubleClick(mouseEvents);
}
return;
#else
return(0);
#endif
}
break;
}
#if !PocketPC
base.WndProc(ref m);
#else
return(NativeWindowCommon.CallWindowProc(OrigWndProc, m.HWnd, (uint)m.Msg, (uint)m.WParam.ToInt32(), m.LParam.ToInt32()));
#endif
}