kotlinlang #tornadofx

I’ve been using tornadoFX’s ItemViewModel to wrap my data classes so I can use the properties in the view, I haven’t tried adding a custom getter, but I suppose I could try

abhinay

01/17/2018, 7:26 AM

@plebian JavaFX has Observable wrappers over most common types in Java. For ex:

IntegerProperty

for

Integer

StringProperty

for

String

and so on. You can create getters for these properties which will return just the plain Java type:

Copy code

private StringProperty name = new SimpleStringProperty();
public String getName() {
   return name.get();
}

abhinay

01/17/2018, 7:28 AM

What do you mean by

custom getter

plebian

01/17/2018, 7:29 AM

just a property with any kind of functionality backing it beyond a basic variable

plebian

01/17/2018, 7:30 AM

This is more of a "googling it is too hard" type question, but what's the best way to make a property update when certain variables are changed?

pike

01/17/2018, 7:32 AM

I’m not really sure about the best way, I’m curious how you are planning to use it?

pike

01/17/2018, 7:32 AM

you can easily add a onChangeListener to it, and handle the code there

pike

01/17/2018, 7:33 AM

Copy code

endDate.valueProperty().onChange { value ->
            val dateVal = LocalDate.parse(model.endDate.value, ymdhmsFormat).format(mdyFormat)
            if(value?.format(mdyFormat) != dateVal && value!!.isAfter(startDate.value)) {
                filterSalesData()
            }
        }

pike

01/17/2018, 7:33 AM

that’s how I handle my datepicker being updated

plebian

01/17/2018, 7:33 AM

that would probably work, I'm now remembering that I've tried this before and the problem I ran into is that when you start binding javafx properties to kotlin properties with custom getters, that they stop updating correctly because that's actually intended functionality

plebian

01/17/2018, 7:34 AM

because it would quickly become a disaster for performance if every variable involved in a custom getter were being watched for changes

plebian

01/17/2018, 7:35 AM

for a super simple example, if you have x and y, and a kproperty which gets the quotient, if a javafx property is bound to the quotient, it won't update when x or y are changed

pike

01/17/2018, 7:36 AM

oh, okay, I think I’m understanding.

pike

01/17/2018, 7:37 AM

again, I think there are many ways to skin this cat.

pike

01/17/2018, 7:38 AM

you’re trying to make it so there is a property that is bound to the x and y so that if x and y change, it will automatically change because it is bound to the properties

plebian

01/17/2018, 7:40 AM

exactly

pike

01/17/2018, 7:40 AM

but you want this to update the UI too?

plebian

01/17/2018, 7:40 AM

updating the property normally results in a ui update, but I think that I already have that tied into a refresh

pike

01/17/2018, 7:41 AM

I’d have to play with it, but, wouldn’t you just add an x.onChange { updateQuotient() } y.onChange{ updateQuotient() }

plebian

01/17/2018, 7:42 AM

that's what I'm planning to try

ron

01/17/2018, 7:43 AM

you could use a NumberBinding

plebian

01/17/2018, 7:43 AM

that could be a better solution, I'm going to play around a bit

pike

01/17/2018, 7:45 AM

interesting, I’ve not played around with Bindings much outside of the ItemViewModel … most of the time I’ve just got to do an action on a button click

pike

01/17/2018, 7:46 AM

https://docs.oracle.com/javase/8/javafx/properties-binding-tutorial/binding.htm

pike

01/17/2018, 7:48 AM

now I want to find somewhere to do it 🙂

ron

01/17/2018, 7:52 AM

@ron uploaded a file: Untitled

-.kt

Isaac

01/17/2018, 10:22 AM

Is there a way to bind the textfield to get the value the user typed? this implementation returns null everytime

-.txt

ron

01/17/2018, 10:23 AM

just

textfield(model.id)

is enough

Isaac

01/17/2018, 10:24 AM

model.id is an integer property, it gave me an error when I tried the first time

Isaac

01/17/2018, 10:24 AM

the example in the wiki only dealt with strings