The ScriptCheckBox command creates a canvas "checkbox" element, which, can be queried from the canvas during a button action.

By default, ischecked = false

The position option can be used to specify absolute coordinates for the location of the button on a canvas, or a relative position below or to the right of the previous component.

$\mathrm{with}\left(\mathrm{DocumentTools}:-\mathrm{Canvas}\right)\:$

LocateVariables := proc( canvas )
   local script := Script(':-canvas'=canvas);
   for local m in GetMath(canvas) do
       script:-SetActive(script,m);
       local vars := indets(m:-math);
       for local v in vars do
          script:-Highlight(script,v);
       end do;
   end do;
   script:-ToString(script);
end proc:

$\mathrm{cv}≔\mathrm{NewCanvas}\left(\left[''Write\; An\; Expression\; with\; Variables''\,\mathrm{ScriptButton}\left(''Identify\; Variables''\,\mathrm{LocateVariables}\,\mathrm{position}\=\left[500\,50\right]\right)\right]\right)\:$

$\mathrm{ShareCanvas}\left(\mathrm{cv}\right)$

$\mathrm{ShowCanvas}\left(\mathrm{cv}\right)$

The DocumentTools[Canvas][ScriptCheckBox] command was introduced in Maple 2022.

For more information on Maple 2022 changes, see Updates in Maple 2022.