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/*
* Copyright (c) 2017-present Robert Jaros
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package pl.treksoft.kvision.data
import com.github.snabbdom.VNode
import com.lightningkite.kotlin.observable.list.ObservableList
import pl.treksoft.kvision.core.Component
import pl.treksoft.kvision.core.Container
import pl.treksoft.kvision.core.Widget
import pl.treksoft.kvision.panel.VPanel
/**
* A container class with support for observable data model.
*
* @constructor Creates DataContainer bound to given data model.
* @param M data model type
* @param C visual component type
* @param model data model of type *ObservableList<M>*
* @param binding a function which creates component C from data model at given index
* @param filter a filtering function
* @param child internal container (defaults to [VPanel])
* @param init an initializer extension function
*/
class DataContainer<M, C : Component>(
private val model: ObservableList<M>,
private val binding: (Int) -> C,
private val filter: ((Int) -> Boolean)? = null,
private val child: Container = VPanel(),
init: (DataContainer<M, C>.() -> Unit)? = null
) :
Widget(setOf()), Container, DataUpdatable {
override var visible
get() = child.visible
set(value) {
child.visible = value
}
internal var onUpdateHandler: (() -> Unit)? = null
init {
child.parent = this
model.onUpdate += { _ ->
update()
}
update()
@Suppress("LeakingThis")
init?.invoke(this)
}
override fun add(child: Component): Container {
this.child.add(child)
return this
}
override fun addAll(children: List<Component>): Container {
this.child.addAll(children)
return this
}
override fun remove(child: Component): Container {
this.child.remove(child)
return this
}
override fun removeAll(): Container {
this.child.removeAll()
return this
}
override fun getChildren(): List<Component> {
return this.child.getChildren()
}
override fun renderVNode(): VNode {
return this.child.renderVNode()
}
/**
* Updates view from the current data model state.
*/
override fun update() {
model.forEach {
if (it is DataComponent) it.container = this
}
singleRender {
child.removeAll()
val indexed = model.mapIndexed { index, m -> index to m }
val children = if (filter != null) {
indexed.filter { p -> filter.invoke(p.first) }
} else {
indexed
}.map { p -> binding(p.first) }
child.addAll(children)
}
onUpdateHandler?.invoke()
}
/**
* Sets a notification handler called after every update.
* @param handler notification handler
* @return current container
*/
fun onUpdate(handler: () -> Unit): DataContainer<M, C> {
onUpdateHandler = handler
return this
}
/**
* Clears notification handler.
* @return current container
*/
fun clearOnUpdate(): DataContainer<M, C> {
onUpdateHandler = null
return this
}
companion object {
/**
* DSL builder extension function.
*
* It takes the same parameters as the constructor of the built component.
*/
fun <M, C : Component> Container.dataContainer(
model: ObservableList<M>,
binding: (Int) -> C,
filter: ((Int) -> Boolean)? = null,
child: Container = VPanel(),
init: (DataContainer<M, C>.() -> Unit)? = null
): DataContainer<M, C> {
val dataContainer = DataContainer(model, binding, filter, child, init)
this.add(dataContainer)
return dataContainer
}
}
}
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