How to create a button in an Openoffice Calc table cell and assign a function (macro) to it?

Question

Macros

I ask you to help create a button in a given cell using the simplest example (I will figure it out myself later). I tormented Google - I did not find anything understandable. Office version 4.1.6.
Given:
1) cells in row A contain either numbers or are empty;
2) cell B1 contains a real number b, B2 contains a natural number n.
Required:
create a button in cell C2, by pressing it, run a script that, in the range of cells from A1 to An, sets the background color #ffaa11 to those of them whose value is strictly greater than b, and the values ​​of the remaining cells from the range are summed up and assigned to cell C1.
The example can be in any language (preferably Java).