Kevin Cochran wrote:
> "Jeroen Mostert" wrote:
>
>> Kevin Cochran wrote:
>>> I am using .NET 2.0, and I would like to specify a custom icon for the
>>> balloon tip using NotifyIcon. I've noticed in the platform SDK that a custom
>>> icon can be specified for a balloon tip using TTM_SETTITLE, but I can't
>>> figure out how to get it to work.
>>>
>> For notify icons, there's already NotifyIcon.BalloonTipIcon. For general
>> tooltips, you can use ToolTip.IsBalloon and ToolTip.ToolTipIcon. The latter
>> does require you to draw the tooltip yourself if the icon isn't a standard
>> icon, but arguably, this is not a bad thing, because using TTM_SETTITLE to
>> specify an icon is only supported from XP SP2 onward.
>>
>> That said, if you don't mind saddling your users with a requirement just to
>> display nice graphics and you're too lazy to draw the tooltip from scratch,
>> this should do the trick. I'm assuming you've already got an icon and a
>> tooltip laying around somewhere.
>>
>> [DllImport("user32.dll")]
>> private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr
>> wParam, IntPtr lParam);
>>
>> const uint TTM_SETTITLEW = 1057;
>>
>> IntPtr tmpStr = null;
>> try {
>> tmpStr = Marshal.StringToHGlobalUni(toolTip.ToolTipTitle);
>> SendMessage(toolTip.Handle, TTM_SETTITLEW, icon.Handle, tmpStr);
>> } finally {
>> Marshal.FreeHGlobal(tmpStr);
>> }
>>
>> Warning: untested.
>>
> Thanks for the advice. Oh, I'm lazy for sure, but in this case, I think I'd
> prefer to draw the icon myself. It's just what's needed in this case. My app
> is build around the NotifyIcon class because it's windowless, and the
> NotifyIcon.BalloonTipIcon does not appear to let you do custom icons, you can
> only choose from one of four predefined ones.
>
> That said, how can I use the ToolTip class in place of the built-in one that
> NotifyIcon uses?
>
Silly me, I didn't notice that NotifyIcon.BalloonTipIcon is *also*
restricted to the default icons! Now look who's lazy.
Alright, yes, getting NotifyIcon to do a custom icon happens to be a *lot*
harder. The shell unfortunately does not use the tool tip control for notify
icons, so TTM_SETTITLE will not avail you here (and custom drawing is not
possible, the best you can do is a custom icon). NotifyIcon does not expose
its notification window handle or id, so you cannot call Shell_NotifyIcon
yourself either. Finally, you cannot determine the position of a notify
icon, so you cannot draw the balloon tip yourself either!
When do you need the balloon tip to appear? If it has to occur as a result
of the user clicking, you can still make it work by handling the MouseClick
event and drawing around that position. Here's a post where that solution is
used:
http://forums.microsoft.com/MSDN/Sho...51783&SiteID=1
If you really need the balloon tip to appear with a custom icon when you
want it, not when the user does something, then start reading up on
Shell_NotifyIcon and good luck writing your own class...
--
J.
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