Igor Tarasov wrote:
2009/4/10 Nikolay Sivov bunglehead@gmail.com:
Igor Tarasov wrote:
Hi there!
I try to implement as precise as possible one undocumented feature in comctl32, this all deals with one structure field. After lots of testing I know the following:
- Default value for that field returned by getter is 0.
- By default it is ignored in behavior.
- If you change value by the setter, even to 0, behavior changes.
- Negative values, such as (-1) also produce different behavior and
cannot be used as "field not changed" flag.
So, does that mean that I have to add new flag to the structure that would be set only if that field is changed, or there is another way to do that?
What flag are you speaking about? Toolbar stuff?
Yep, it's about undocumented feature of iBitmap controlling buttons' size But it works only if cx is zero and iBitmap was not specifically set.
So (-1) for iButton is reserved for not using imagelist bitmap at all and in some places this value checked for <0 instead of == -1, right? Does it apply for separators only? If not maybe it's better to add something like BOOL IsiBitmapValid. Let's get another opinions. (Hope you'll be ready with patch for today release)