protected virtual void OnHeaderToolTip(ToolTipShowingEventArgs args) {
if (this.HeaderToolTipShowing != null)
this.HeaderToolTipShowing(this, args);
}
private void ApplyEventFormatting(ToolTipShowingEventArgs args) {
if (!args.IsBalloon.HasValue &&
!args.BackColor.HasValue &&
!args.ForeColor.HasValue &&
args.Title == null &&
!args.StandardIcon.HasValue &&
!args.AutoPopDelay.HasValue &&
args.Font == null)
return;
this.PushSettings();
if (args.IsBalloon.HasValue)
this.IsBalloon = args.IsBalloon.Value;
if (args.BackColor.HasValue)
this.BackColor = args.BackColor.Value;
if (args.ForeColor.HasValue)
this.ForeColor = args.ForeColor.Value;
if (args.StandardIcon.HasValue)
this.StandardIcon = args.StandardIcon.Value;
if (args.AutoPopDelay.HasValue)
this.AutoPopDelay = args.AutoPopDelay.Value;
if (args.Font != null)
this.Font = args.Font;
if (args.Title != null)
this.Title = args.Title;
}
protected virtual void OnShowing(ToolTipShowingEventArgs e) {
if (this.Showing != null)
this.Showing(this, e);
}
/// <summary>
/// Handle a get display info message
/// </summary>
/// <param name="msg">The msg</param>
/// <returns>True if the message has been handled</returns>
public virtual bool HandleGetDispInfo(ref Message msg) {
//System.Diagnostics.Trace.WriteLine("HandleGetDispInfo");
this.SetMaxWidth();
ToolTipShowingEventArgs args = new ToolTipShowingEventArgs();
args.ToolTipControl = this;
this.OnShowing(args);
if (String.IsNullOrEmpty(args.Text))
return false;
this.ApplyEventFormatting(args);
NativeMethods.NMTTDISPINFO dispInfo = (NativeMethods.NMTTDISPINFO)msg.GetLParam(typeof(NativeMethods.NMTTDISPINFO));
dispInfo.lpszText = args.Text;
dispInfo.hinst = IntPtr.Zero;
if (args.RightToLeft == RightToLeft.Yes)
dispInfo.uFlags |= TTF_RTLREADING;
Marshal.StructureToPtr(dispInfo, msg.LParam, false);
return true;
}