Agnostic project and ToolBar Icons

General
1

The project is agnostic, so I created a data folder where the informations are stored (using default names: logo.png and address.txt) and read when needed in the program.

Now, I have to add icons I will use in the ToolBar and I realize that I do not know how to load dynamically a “Xojo Picture“ (better know as ImageSet) with two resolutions (1x and 2x).
Of course, I created the logo as Icons and when I wanted to code the ToolBarIcon change I realized… “I do not know how to do that”.

I read:
Getting Started with Graphics
HiDPI Support

Constructor(width As Integer, height As Integer, bitmaps() As Picture)
looks the way to go, but there is no indication on how to add bitmaps to the Picture.

Just before sending this, I made a search in the Fodum and found this same question from 2021 with an answer from Anthony G. Cyphers.

Please, add this to the documentation.

I will implement it hopping everything is OK.

2

Load each of the resolutions into an array, starting with the 1x image (if you’re doing a Windows app, load a 3x version as well). Then use the width and height of the 1x version for the picture.

The trick is that all of the images need to have the exact same dimension in points. Let’s say that the icon is 30x30.

  • At 1x, the image is 30x30
  • At 2x, the image is 60x60
  • At 3x, the image is 90x90

If you don’t get the sizes exactly right, I believe you’ll get an exception. I suggest loading them into the array in order so you can use the first element for the dimensions as well.

3

Thanks Greg.

In the mean time, I implemented Anthony solution.

Works really fine.