Synchronize Data Models—Binding and Triggers - JavaFX: Developing Rich Internet Applications - page 75

var max1 = bind if ((a > b) and (a > c)) a else
if ((b > a) and (b > c)) b else c;
function getMax(i1: Integer, i2: Integer, i3: Integer)
: Integer {
if ((i1 > i2) and (i1 > i3)) { return i1; }
else if ((i2 > i1) and (i2 > i3)) { return i2; }
else { return i3; }
}
var max2 = bind getMax(a, b, c);
println("max1={max1}, max2={max2}");
a = 4;
println("max1={max1}, max2={max2}");
b = 5;
println("max1={max1}, max2={max2}");
c = 2;
println("max1={max1}, max2={max2}");
outputs the same values for each bound variable:
max1=3, max2=3
max1=4, max2=4
max1=5, max2=5
max1=5, max2=5
Binding and For Expressions
You can use the for expression to bind JavaFX sequences. For example, the fol-
lowing lines will create a sequence called seq , of length 5, where the elements
are [0, 1, 2, 3, 4] .
var val = 0;
function incrementVal() : Integer {
return val++;
}
var start = 0;
var end = 4;
var seq = bind for (x in [start..end]) incrementVal();
println(seq);
A change in value for either variable, start or end , will also change the bound
sequence seq too. Next, we'll step through changes to start and end to see how
that affects what seq looks like. Furthermore, because the incrementVal()
function always returns an element with a value one greater than its previous