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/*
* Copyright 2018 Allan Wang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ca.allanwang.kau.swipe
import kotlin.math.max
import kotlin.math.min
/**
* 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 =
min(-offset * max(1 - percent, 0f) + DEFAULT_OFFSET, 0f)
SWIPE_EDGE_RIGHT -> page.swipeBackLayout.x =
min(offset * max(1 - percent, 0f) - DEFAULT_OFFSET, 0f)
SWIPE_EDGE_TOP -> page.swipeBackLayout.y =
min(-offset * max(1 - percent, 0f) + DEFAULT_OFFSET, 0f)
SWIPE_EDGE_BOTTOM -> page.swipeBackLayout.y =
min(offset * 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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