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package ca.allanwang.kau.swipe
import android.app.Activity
import ca.allanwang.kau.R
import ca.allanwang.kau.swipe.SwipeBackHelper.onDestroy
import java.util.*
class SwipeBackException(message: String = "You Should call kauSwipeOnCreate() first") : RuntimeException(message)
/**
* Singleton to hold our swipe stack
* All activity pages held with strong references, so it is crucial to call
* [onDestroy] whenever an activity should be disposed
*/
object SwipeBackHelper {
private val pageStack = Stack<SwipeBackPage>()
private operator fun get(activity: Activity): SwipeBackPage
= pageStack.firstOrNull { it.activity === activity } ?: throw SwipeBackException()
fun getCurrentPage(activity: Activity): SwipeBackPage = this[activity]
fun onCreate(activity: Activity, builder: SwipeBackContract.() -> Unit = {}) {
val page = pageStack.firstOrNull { it.activity === activity } ?: pageStack.push(SwipeBackPage(activity).apply { builder() })
val startAnimation: Int = when (page.edgeFlag) {
SWIPE_EDGE_LEFT -> R.anim.kau_slide_in_right
SWIPE_EDGE_RIGHT -> R.anim.kau_slide_in_left
SWIPE_EDGE_TOP -> R.anim.kau_slide_in_bottom
else -> R.anim.kau_slide_in_top
}
activity.overridePendingTransition(startAnimation, 0)
}
fun onPostCreate(activity: Activity) = this[activity].onPostCreate()
fun onDestroy(activity: Activity) {
val page: SwipeBackPage = this[activity]
pageStack.remove(page)
page.activity = null
}
fun finish(activity: Activity) = this[activity].scrollToFinishActivity()
internal fun getPrePage(activity: SwipeBackPage): SwipeBackPage? {
val index = pageStack.indexOf(activity)
return if (index > 0) pageStack[index - 1] else null
}
}
/**
* The following are the activity bindings to add an activity to the stack
* onCreate, onPostCreate, and onDestroy are mandatory
* finish is there as a helper method to animate the transaction
*/
fun Activity.kauSwipeOnCreate(builder: SwipeBackContract.() -> Unit = {}) = SwipeBackHelper.onCreate(this, builder)
fun Activity.kauSwipeOnPostCreate() = SwipeBackHelper.onPostCreate(this)
fun Activity.kauSwipeOnDestroy() = SwipeBackHelper.onDestroy(this)
fun Activity.kauSwipeFinish() = SwipeBackHelper.finish(this)
/**
* Constants used for the swipe edge flags
*/
const val SWIPE_EDGE_LEFT = ViewDragHelper.EDGE_LEFT
const val SWIPE_EDGE_RIGHT = ViewDragHelper.EDGE_RIGHT
const val SWIPE_EDGE_TOP = ViewDragHelper.EDGE_TOP
const val SWIPE_EDGE_BOTTOM = ViewDragHelper.EDGE_BOTTOM
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