Koan and MPAndroidChart together about anko HOT 16 CLOSED

I found how can I to use certain this

lineChart {
 setOnChartValueSelectedListener(this@MainActivity)
}

But my other issues still to be resolved.

from anko.

Hello, @xgrommx!

You can make use of ctx and act extension properties in any class that extends Activity (explained in Instance shorthands part of manual) as well as using this@MainActivity syntax.

As for replacing setData() with data property, Kotlin does not provide native properties for Java classes automatically. Properties for the Views in Android SDK are contained in Koan, though you must write your own for the custom types.

For example,

var <T> Chart<T>.data: T
    get() = getData()
    set(value) = setData(value)

from anko.

@yanex I don't know when I should put this code =(

var <T> Chart<T>.data: T
    set(value) = setData(value)

from anko.

Also I have yet another question. Now I use this construction:

                    var set1 = RadarDataSet(generateSourceY(2), "Set 1")
                    set1.setColor(Color.RED)
                    set1.setDrawFilled(true)
                    set1.setLineWidth(2f)

But I would like use it as in C#(I'm .net developer, but kotlin of interest to me)

                    RadarDataSet() {
                        source = generateSourceY(2)
                        label = "Set 1"
                        color = Color.RED
                        drawFilled = true
                        lineWidth = 2f
                    }

or

                    RadarDataSet(generateSourceY(2), "Set 1") {
                        color = Color.RED
                        drawFilled = true
                        lineWidth = 2f
                    }

Could you please explain how can I do it?

from anko.

I don't know when I should put this code =(

You could put it in any .kt file in your project from where you could import it.
If you have lots of custom components, it would be easier to manage them if put in the separate file (CustomDslComponents.kt or similar).

By the way, your property declaration doesn't contain get() clause. As for now, val property in Kotlin must contain a getter, and var (mutable) property — a pair of getter and setter.

Could you please explain how can I do it?

The code is similar as for getData() except it has different types:

var RadarDataSet.lineWidth: Float
    get() = getLineWidth()
    set(value) = setLineWidth(value)

And so on. Also you could use a Kotlin's with() function:

with(RadarDataSet()) {
    // `this` now is a RadarDataSet instance
    color = Color.RED
    lineWidth = 2f
}

You can read more about extension functions and properties here.

from anko.

But with return Unit type instead of a new instance RadarDataSet =( and if I use without with operator I got errors =>

var set = RadarDataSet(generateSourceY(2), "Set 1") {
                        color = Color.RED
                    }

from anko.

Well, you can either return this from lambda:

val dataSet = with(RadarDataSet()) {
    color = Color.RED
    this
}

or replace with function with the custom function that returns the argument instead of lambda calculation result:

inline fun <T> have(obj: T, init: T.() -> Unit): T {
    obj.init()
    return obj
}

val dataSet = have(RadarDataSet()) {
    color: Color.RED
}

As an alternative, you could make a new function specially for the RadarDataSet() type that imitates constructor:

fun RadarDataSet(init: RadarDataSet.() -> Unit): RadarDataSet {
    val obj = RadarDataSet()
    obj.init()
    return obj
}

val dataSet = RadarDataSet {
    color: Color.RED
}

from anko.

Thanks! It's work now!)

    public var RadarDataSet.color: Int
        get() = getColor()
        set(value) = setColor(value)

    public var RadarDataSet.lineWidth: Float
        get() = getLineWidth()
        set(value) = setLineWidth(value)

    public var RadarDataSet.drawFilled: Boolean
        get() = isDrawFilledEnabled()
        set(value) = setDrawFilled(value)

    fun RadarDataSet(list: ArrayList<Entry>, label: String, init: RadarDataSet.() -> Unit): RadarDataSet {
        val obj = RadarDataSet(list, label)
        obj.init()
        return obj;
    }
    var set = RadarDataSet(generateSourceY(2), "Set1") {
        color = Color.RED
        lineWidth = 2f
        drawFilled = true
    }
}

As I understood the same way for radarChart?

    fun ViewManager.radarChart(init: RadarChart.() -> Unit = {}) = __dslAddView({ RadarChart(it)}, init, this)

I just need create similar function and getters, setters and I could be use it like a RadarDataSet?

from anko.

Yes, that's it!

from anko.

But that is not working in this case. RadarChart has the method getXLabels() which return XLabels class.

    public var XLabels.textSize: Float
        get() = getTextSize()
        set(value) = setTextSize(value)

And this code doesn't work now. No errors but and no results of work

    getXLabels() {
        textSize = 9f
    }

How can I solve this case?

from anko.

Which getXLabels() function do you use? If one defined in RadarChart.java, the code you provided is unlikely to compile.

It would be better if you show some additional code.

from anko.

Sure, all files you can see in my repository. Now I use java way https://github.com/xgrommx/KoanMPAndroidChartExample/blob/master/app/src/main/kotlin/com/gromm/koanexample/MainActivity.kt#L152 but will be good if I can use a declarative style.

from anko.

Well, you could write this (the fastest way if you don't need the result):

with (getXLabels()) {
    setTextSize(9f)
}

Or write an another extension function:

fun RadarChart.xLabels(init: XLabels.() -> Unit): XLabels {
    val obj = getXLabels()
    obj.init()
    return obj
}

xLabels {
    setTextSize(9f)
}

from anko.

Awesome! Thanks, as for me Kotlin looks very clearly unlike Scala and it's good. And for Android Scala has very big runtime library. My choise for Android it's Kotlin =) Could I to ask you in future if I have questions?

from anko.

Also I have one small question. This is correct syntax or I could you use smth instead of a ViewManager

fun ViewManager.radarChart(init: RadarChart.() -> Unit = {}) = __dslAddView({ RadarChart(it)}, init, this)

Now I cannot extract a declaration of my radarChart in another function because this one required parent layout like a verticalLayout or etc.

from anko.

Sorry for the long response.
You could extract part of your DSL as an extension function.

verticalLayout {
  frameLayout {
    textView("Text")
  }
}

And extracted version:

verticalLayout {
  extractedFunction()
}

fun LinearLayout.framedText() {
  frameLayout {
    textView("Text")
  }
}

from anko.