public static extern int GetTextExtentPoint32(IntPtr hDC, string String, int stringSize, ref WINAPI.SIZE size);
/// <summary>
/// Shows the ballon tooltip
/// </summary>
/// <param name="timeout"></param>
public void ShowBalloonTip(int timeout)
{
//Check if a balloon already is shown or no user control was defined
if (moNativeWindow.Handle != IntPtr.Zero || moPanel == null)
return;
//Get a handle for the notify icon
IntPtr loNotifyIconHandle = GetHandler(moNotifyIcon);
if (loNotifyIconHandle == IntPtr.Zero)
return;
//Trying to find notify icon rectangle on a desktop
if (!GetNotifyIconScreenRect(loNotifyIconHandle))
return;
//Create parameters for a new tooltip window
System.Windows.Forms.CreateParams moCreateParams = new System.Windows.Forms.CreateParams();
// New window is a tooltip and a balloon
moCreateParams.ClassName = WINAPI.TOOLTIPS_CLASS;
moCreateParams.Style = WINAPI.WS_POPUP | WINAPI.TTS_NOPREFIX | WINAPI.TTS_ALWAYSTIP | WINAPI.TTS_BALLOON;
moCreateParams.Parent = loNotifyIconHandle;
// Create the tooltip window
moNativeWindow.CreateHandle(moCreateParams);
//We save old window proc to be used later and replac it our own
IntPtr loNativeProc = WINAPI.SetWindowLong(moNativeWindow.Handle, WINAPI.GWL_WNDPROC, wpcallback);
if (loNativeProc == IntPtr.Zero)
return;
if (WINAPI.SetProp(moNativeWindow.Handle, "NATIVEPROC", loNativeProc) == 0)
return;
// Make tooltip the top level window
if (!WINAPI.SetWindowPos(moNativeWindow.Handle, WINAPI.HWND_TOPMOST, 0, 0, 0, 0, WINAPI.SWP_NOACTIVATE | WINAPI.SWP_NOSIZE))
return;
// Tool tip info. Set a TRACK flag to show it in specified position
WINAPI.TOOLINFO ti = new WINAPI.TOOLINFO();
ti.cbSize = Marshal.SizeOf(ti);
ti.uFlags = WINAPI.TTF_TRACK;
ti.hwnd = loNotifyIconHandle;
//Approximating window size by use of char size
WINAPI.SIZE size = new WINAPI.SIZE();
IntPtr hDC = WINAPI.GetDC(moNativeWindow.Handle);
if (hDC == IntPtr.Zero)
return;
if (WINAPI.GetTextExtentPoint32(hDC, ".", 1, ref size) == 0)
return;
int lines = 1 + moPanel.Height / size.cy;
int cols = moPanel.Width / size.cx;
ti.lpszText = ".";
for (int i = 0; i < lines; i++)
{
for (int j = 0; j < cols; j++)
ti.lpszText += ".";
ti.lpszText += "\r\n";
}
//Add tool to the notify icon
if (WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_ADDTOOL, 0, ref ti) == 0)
return;
WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_SETTIPBKCOLOR,
ColorTranslator.ToWin32(Color.LightYellow), ref ti);
WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_SETTIPTEXTCOLOR,
ColorTranslator.ToWin32(Color.Black), ref ti);
WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_SETDELAYTIME, Duration.AutoPop, 1000);
WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_TRACKPOSITION, 0, (moPosition.Y << 16) + moPosition.X);
WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_SETTITLE, (int)BalloonTipIcon, BalloonTipTitle);
WINAPI.SendMessage(moNativeWindow.Handle, WINAPI.TTM_TRACKACTIVATE, 1, ref ti);
// Raise shown event
OnBalloonTipShown(this, EventArgs.Empty);
// Timeout for the tooltip
moTimer.Interval = timeout;
moTimer.Start();
}