private Size GetToolTipWindowSize(string contentSpacing)
{
Win32.TOOLINFO ti = new Win32.TOOLINFO();
ti.cbSize = Marshal.SizeOf(ti);
ti.uFlags = Win32.TTF_TRACK;
ti.lpszText = contentSpacing;
if (0 == Win32.SendMessage(Handle, Win32.TTM_ADDTOOL, 0, ref ti))
{
throw new Exception();
}
// enable multi-line text-layout
Win32.SendMessage(Handle, Win32.TTM_SETMAXTIPWIDTH, 0, SystemInformation.MaxWindowTrackSize.Width);
Win32.SendMessage(Handle, Win32.TTM_TRACKACTIVATE, 1, ref ti);
Win32.RECT rect = new Win32.RECT();
Win32.GetWindowRect(Handle, ref rect);
Win32.SendMessage(Handle, Win32.TTM_TRACKACTIVATE, 0, ref ti);
Win32.SendMessage(Handle, Win32.TTM_DELTOOL, 0, ref ti);
return(new Size(rect.right - rect.left, rect.bottom - rect.top));
}
private Win32.TOOLINFO CreateTool(string contentSpacing, IWin32Window window, StemPosition stemPosition)
{
Win32.TOOLINFO ti = new Win32.TOOLINFO();
ti.cbSize = Marshal.SizeOf(ti);
ti.uFlags = Win32.TTF_IDISHWND | Win32.TTF_TRACK | Win32.TTF_TRANSPARENT;
ti.uId = window.Handle;
ti.hwnd = window.Handle;
ti.lpszText = contentSpacing;
if (StemPosition.BottomCentre == stemPosition || StemPosition.TopCentre == stemPosition)
{
ti.uFlags |= Win32.TTF_CENTERTIP;
}
if (0 == Win32.SendMessage(Handle, Win32.TTM_ADDTOOL, 0, ref ti))
{
throw new Exception();
}
// enable multi-line text-layout
Win32.SendMessage(Handle, Win32.TTM_SETMAXTIPWIDTH, 0, SystemInformation.MaxWindowTrackSize.Width);
return(ti);
}
public ToolTipWindow(Control content, IWin32Window window, int x, int y, StemPosition stemPosition, bool useAnimation, bool useFading)
{
Window = window;
CreateParams createParams = new CreateParams();
createParams.ClassName = Win32.TOOLTIPS_CLASS;
createParams.Style = Win32.TTS_ALWAYSTIP | Win32.TTS_BALLOON;
if (!useAnimation)
{
createParams.Style |= Win32.TTS_NOANIMATE;
}
if (!useFading)
{
createParams.Style |= Win32.TTS_NOFADE;
}
CreateHandle(createParams);
// first, work out the actual stem-position: the supplied value is a hint, but may have to be changed if there isn't enough space to accomodate it
string contentSpacing = GetSizingText(content);
// this is where the caller would like us to be
Rectangle toolTipBounds = CalculateToolTipLocation(contentSpacing, Window, x, y, stemPosition);
Screen currentScreen = Screen.FromHandle(Window.Handle);
Rectangle screenBounds = currentScreen.WorkingArea;
stemPosition = AdjustStemPosition(stemPosition, ref toolTipBounds, ref screenBounds);
// and this is where we'll actually end up
toolTipBounds = CalculateToolTipLocation(contentSpacing, Window, x, y, stemPosition);
toolTipBounds.X = Math.Max(0, toolTipBounds.X);
toolTipBounds.Y = Math.Max(0, toolTipBounds.Y);
// build the tooltip window
_toolInfo = CreateTool(contentSpacing, Window, stemPosition);
// initial position to force the stem into the correct orientation
int initialX = screenBounds.X;
int initialY = screenBounds.Y;
if (StemPosition.TopLeft == stemPosition || StemPosition.BottomLeft == stemPosition)
{
initialX += StemInset;
}
else if (StemPosition.TopCentre == stemPosition || StemPosition.BottomCentre == stemPosition)
{
initialX += screenBounds.Width / 2;
}
else
{
initialX += screenBounds.Width - StemInset;
}
if (StemPosition.BottomLeft == stemPosition || StemPosition.BottomCentre == stemPosition || StemPosition.BottomRight == stemPosition)
{
initialY += screenBounds.Height;
}
Win32.SendMessage(Handle, Win32.TTM_TRACKPOSITION, 0, (initialY << 16) | initialX);
// and finally display it
Win32.SendMessage(Handle, Win32.TTM_TRACKACTIVATE, 1, ref _toolInfo);
DoLayout(Window, content, stemPosition, ref toolTipBounds);
_contentPanel.MouseDown += delegate(object sender, MouseEventArgs e) {
if (null != MouseDown && _mouseOverToolTip)
{
_mouseOverToolTip = true;
MouseDown(this, e);
}
};
_contentPanel.MouseEnter += delegate(object sender, EventArgs e)
{
if (null != MouseEnter && !_mouseOverToolTip)
{
_mouseOverToolTip = true;
MouseEnter(this, e);
}
};
_contentPanel.MouseLeave += delegate(object sender, EventArgs e)
{
// only send the event if the mouse has actually left the balloon and not simply moved from _contentPanel to the caller-supplied content
if (null != MouseLeave && _mouseOverToolTip && null == _contentPanel.GetChildAtPoint(_contentPanel.PointToClient(Control.MousePosition)))
{
_mouseOverToolTip = false;
MouseLeave(this, e);
}
};
}
