eva/3 Application Builder • Developing eva/3 Applications • Working with expressions • Expression-Editor
User interface
The user interface consists of five different registers:
The function register, the operator register, the constant register, the component register
and the calculator register.
Fig. 247: ExpressionEditor
Function register
The function register provides different functions, which can be selected and taken over
into the editor by a middleclick.
Fig. 248: Function register
Operator register
In the operator register it is possible to choose between mathematical and relational operators.
Fig. 249: Operator register
Constant register
The constant register contains the constants true, false, null
and a empty string.
Fig. 250: Constant register
Component register
In the component register all components/objects which are in the formular
can be choosen and insert by a double click.
Fig. 251: Component register
Calculator register
The calculator register contains a multitude of numbers, functions and
relational operators.
By a easy click at the button they will be taken over.
Fig. 252: Calculator register
Expression-Editor