Name Rascal/Libraries/Vis/Figure/Figures/button

Synopsis An interactive push button.

Function Figure button(str label, void () vcallback, FProperty props...)

Description A button with the text label. Whenever the user clicks on this button, callback vcallback is called. Typically, the callback causes a state change in the Rascal program (e.g., the value of a variable is changed) and this variable is used in another part of the figure.

Examples

public Figure inc(){
  int n = 0;
  return vcat([ button("Increment", void(){n += 1;}),
                text(str(){return "<n>";})
              ]);
}
render(inc());

Clicking the button will increment the value of n.

Pitfalls Unfortunately we cannot show an interactive version of the above example here. Try it out in Rascal itself.

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