/// <summary>
/// Sets the status text of the dialog box.
/// </summary>
/// <param name="hwnd">The hwnd of the dialog box.</param>
/// <param name="statusText">The status text to set.</param>
private static void SetStatusText(IntPtr hwnd, string statusText)
{
NativeMethods.SendMessage(hwnd, (uint)BrowseForFolderMessages.BFFM_SETSTATUSTEXTW, (IntPtr)1, statusText);
}
/// <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);
}
}
/// <summary>
/// Enables or disables the OK button in the dialog box.
/// </summary>
/// <param name="hwnd">The hwnd of the dialog box.</param>
/// <param name="isEnabled">Whether or not the OK button should be enabled.</param>
private static void EnableOk(IntPtr hwnd, bool isEnabled)
{
NativeMethods.SendMessage(hwnd, (uint)BrowseForFolderMessages.BFFM_ENABLEOK, (IntPtr)0, (IntPtr)(isEnabled ? 1 : 0));
}
void EndUpdate()
{
NativeMethods.SendMessage(Handle, NativeMethods.WM_SETREDRAW, 1, 0);
}
private void UpdateImageList()
{
IntPtr handle = IntPtr.Zero;
if (this.Style != CommandBarStyle.Menu)
{
Size size = new Size(8, 8);
for (int i = 0; i < items.Count; i++)
{
Image image = items[i].Image;
if (image != null)
{
if (image.Width > size.Width)
{
size.Width = image.Width;
}
if (image.Height > size.Height)
{
size.Height = image.Height;
}
}
}
Image[] images = new Image[items.Count];
for (int i = 0; i < items.Count; i++)
{
Image image = items[i].Image;
images[i] = (image != null) ? image : new Bitmap(size.Width, size.Height);
}
if (this.imageList == null)
{
this.imageList = new ImageList();
this.imageList.ImageSize = size;
this.imageList.ColorDepth = ColorDepth.Depth32Bit;
for (int i = 0; i < images.Length; i++)
{
this.imageList.Images.Add(images[i]);
}
}
else if (this.imageList.Images.Count == images.Length)
{
for (int i = 0; i < images.Length; i++)
{
this.imageList.Images[i] = images[i];
}
}
else
{
this.imageList.Images.Clear();
this.imageList.ImageSize = size;
for (int i = 0; i < images.Length; i++)
{
this.imageList.Images.Add(images[i]);
}
}
handle = this.imageList.Handle;
}
NativeMethods.SendMessage(this.Handle, NativeMethods.TB_SETIMAGELIST, 0, handle);
}
private void BeginUpdate()
{
NativeMethods.SendMessage(Handle, NativeMethods.WM_SETREDRAW, 0, 0);
}
private void TrackDropDown(int index)
{
while (index >= 0)
{
this.trackNextItem = -1;
this.BeginUpdate();
CommandBarMenu menu = this.items[index] as CommandBarMenu;
if (menu != null)
{
menu.PerformDropDown(EventArgs.Empty);
this.contextMenu.Items.Clear();
this.contextMenu.Items.AddRange(menu.Items); // = menu.Items;
this.contextMenu.Mnemonics = true;
}
else
{
this.contextMenu.Items.Clear(); // .Items = new CommandBarItemCollection();
this.contextMenu.Mnemonics = true;
}
// Item state
NativeMethods.SendMessage(this.Handle, NativeMethods.TB_PRESSBUTTON, index, -1);
// Trick to get the first menu item selected
NativeMethods.PostMessage(this.Handle, NativeMethods.WM_KEYDOWN, (int)Keys.Down, 1);
NativeMethods.PostMessage(this.Handle, NativeMethods.WM_KEYUP, (int)Keys.Down, 1);
this.SetState(State.HotTracking, index);
// Hook
NativeMethods.HookProc hookProc = new NativeMethods.HookProc(DropDownHook);
GCHandle hookProcHandle = GCHandle.Alloc(hookProc);
this.hookHandle = NativeMethods.SetWindowsHookEx(NativeMethods.WH_MSGFILTER, hookProc, IntPtr.Zero, NativeMethods.GetCurrentThreadId());
if (this.hookHandle == IntPtr.Zero)
{
throw new SecurityException();
}
// Ask for position
NativeMethods.RECT rect = new NativeMethods.RECT();
NativeMethods.SendMessage(Handle, NativeMethods.TB_GETRECT, index, ref rect);
Point position = new Point(rect.left, rect.bottom);
this.EndUpdate();
this.Update();
this.contextMenu.Show(this, position);
// Unhook
NativeMethods.UnhookWindowsHookEx(hookHandle);
hookProcHandle.Free();
this.hookHandle = IntPtr.Zero;
// Item state
NativeMethods.SendMessage(Handle, NativeMethods.TB_PRESSBUTTON, index, 0);
this.SetState(trackEscapePressed ? State.Hot : State.None, index);
index = trackNextItem;
}
}
private void SetHotItem(int index)
{
NativeMethods.SendMessage(Handle, NativeMethods.TB_SETHOTITEM, index, 0);
}
private int GetHotItem()
{
return(NativeMethods.SendMessage(Handle, NativeMethods.TB_GETHOTITEM, 0, 0));
}
private bool IsValid(int index)
{
int count = NativeMethods.SendMessage(Handle, NativeMethods.TB_BUTTONCOUNT, 0, 0);
return((index >= 0) && (index < count));
}
