SysImageList problem

Johnny_Bit · Moderator Joined: 15 Jun 2003 Posts: 170

Hi, I have little problem with SysImageList, concretly with drawning icons. The problem is that icon is placed on non-transparent white square and no settings about drawning style, or bk color can change it. maybe screen will show it:

Kambiz · Posted: 22/06/04 10:11 Post subject:

Probably you set the DrawingStyle property of TSysImageList to dsNormal. It should be dsTransparent.

Johnny_Bit · Moderator Joined: 15 Jun 2003 Posts: 170

it is dsTransparent by Default.. i tried to change blend and bk color to cl none but that doesn't help...

Kambiz · Posted: 22/06/04 19:45 Post subject:

It could not be because of TSysImageList, because the component just set the image list handle, and doesn't override the base class methods.

Are you using a third party XP Theme Manager?

Johnny_Bit · Moderator Joined: 15 Jun 2003 Posts: 170

Well i do use ThemeManager from Delphi Germs, but when i removed it (completly, so there are no even single call or unit left knowing 'bout existence of it) and problem still exist...

Kambiz · Posted: 27/06/04 21:05 Post subject:

Is the drawing okay when you use TImageList instead of TSysImageList?

Johnny_Bit · Moderator Joined: 15 Jun 2003 Posts: 170

Icons & bitmaps works fine, but i didn't tried 32 bits icons. i try later, more sets but it seems that this problem is hard to solve...

Kambiz · Posted: 30/06/04 16:30 Post subject:

Hi,

Suddenly today I encountered to the same problem in my own application.

The controls use either ImageList_Draw or ImageList_DrawEx API function to draw an imagelist image on their device context. The controls that using the second API, have problem with image transparency.

ImageList_DrawEx API as one of its parameters needs the background color, and imagelist provides a value for this parameter by BkColor property. To have a transparent image, the BkColor property must be clNone.

To resolve the problem in SysImageList, I changed the default value of BkColor property to clNone.

The update is available to download.

Cheers,
Kambiz

Johnny_Bit · Moderator Joined: 15 Jun 2003 Posts: 170

heh... i didn't thinked that it was it... i've got same problem with api functions when i tried to make nice gray out effect and hotlight efect on images... damn.. if i had just hard line connection to internet on my home computer... it would be great. thanks a lot Kambiz