Reference - Focus Policy

This chapter describes how to implement the focus handling for a reference. A transparent object changes the color when the reference gets the focus.

  1. In the reference, change the color of the object by adding a script to the Clicked, KeyBoardFocusIn and KeyBoardFocusOut events. In this example a rectangle that contains an ellipse, a text field and a button is used. Add the scripts to the rectangle.

    Clicked:

    main(mapping event)
    {
       if ( ELLIPSE1.backCol == "red" )
           ELLIPSE1.backCol = "green";
        else
            ELLIPSE1.backCol = "red";
    }   

    KeyBoardFocusIn:

    main()
    {
       this.foreCol = "blue";
       ELLIPSE1.foreCol = "blue";
    }  

    KeyBoardFocusOut:

    main()
    {
       this.foreCol = "";
    }    
  2. Set the Focus Policy of the rectangle in the attribute editor to StrongFocus and save the reference.
  3. Add the reference to a panel. Use the tab key to move from one object to another.
  4. The color is changed when the rectangle gets the focus.
    Abbildung 1. Focus Policy