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package ca.allanwang.kau.swipe
/**
* Created by Mr.Jude on 2015/8/26.
*
* Updated by Allan Wang on 2017/07/05
*
* Helper class to give the previous activity an offset as the main page is pulled
*/
internal class RelativeSlider(var curPage: SwipeBackPage) : SwipeListener {
var offset = 0f
var enabled: Boolean
get() = curPage.hasListener(this)
set(value) {
if (value) curPage.addListener(this)
else curPage.removeListener(this)
}
/**
* Set offset of previous page based on the edge flag and percentage scrolled
*/
override fun onScroll(percent: Float, px: Int, edgeFlag: Int) {
if (offset == 0f) return //relative slider is not enabled
val page = SwipeBackHelper.getPrePage(curPage) ?: return
if (percent == 0f) {
page.swipeBackLayout.x = 0f
page.swipeBackLayout.y = 0f
return
}
when (edgeFlag) {
SWIPE_EDGE_LEFT -> page.swipeBackLayout.x = Math.min(-offset * Math.max(1 - percent, 0f) + DEFAULT_OFFSET, 0f)
SWIPE_EDGE_RIGHT -> page.swipeBackLayout.x = Math.min(offset * Math.max(1 - percent, 0f) - DEFAULT_OFFSET, 0f)
SWIPE_EDGE_TOP -> page.swipeBackLayout.y = Math.min(-offset * Math.max(1 - percent, 0f) + DEFAULT_OFFSET, 0f)
SWIPE_EDGE_BOTTOM -> page.swipeBackLayout.y = Math.min(offset * Math.max(1 - percent, 0f) - DEFAULT_OFFSET, 0f)
}
}
override fun onEdgeTouch() {}
/**
* Reset offsets for previous page
*/
override fun onScrollToClose(edgeFlag: Int) {
val prePage = SwipeBackHelper.getPrePage(curPage) ?: return
prePage.swipeBackLayout.x = 0f
prePage.swipeBackLayout.y = 0f
}
companion object {
private const val DEFAULT_OFFSET = 40
}
}
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