[Lazarus] Scaling of toolbar icons

[Werner Pamler]

Am 09.07.2017 um 07:18 schrieb Ondrej Pokorny via Lazarus:
> On 09.07.2017 0:22, Werner Pamler via Lazarus wrote:
>> Ondrej, you implemented scaling of the images used for the toolbar 
>> and menu of the IDE. Where can I find these methods?
>
> IDEImagesIntf.pas
>
>> Are they available for standard imagelists for non-IDE usage?
>
> No, the current solution is Lazarus specific. (It doesn't make sense 
> to have IDEImagesIntf.pas in LCL.) You can use a similar approach for 
> your applications, though.

Thanks. I have the idea of writing a "TScaledImageList" which needs up 
to three imagelists with different resolutions. It will calculate the 
required image size from its BaseWidth/BaseHeight and BasePixelsPerInch 
settings and the current PixelsPerInch. If the requested image size 
matches one of the linked image lists it will copy these images to 
itself. If the image size does not match it will create stretchdrawn 
images from those with the closest size. The ScaledImageList is the 
imagelist linked to form components, such as TListView or TTreeView. I 
did not start any coding, yet, but I think it should work and should 
greatly facilitate using scaled images at the application level.