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/*
* Copyright 2019 Allan Wang
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.pitchedapps.frost.views
import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import android.view.ViewConfiguration
import android.webkit.WebView
import android.widget.ListView
import androidx.core.widget.ListViewCompat
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout.OnChildScrollUpCallback
import com.pitchedapps.frost.utils.L
/**
* Variant that forbids refreshing if child layout is not at the top
* Inspired by https://github.com/slapperwan/gh4a/blob/master/app/src/main/java/com/gh4a/widget/SwipeRefreshLayout.java
*
*/
class SwipeRefreshLayout @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
SwipeRefreshLayout(context, attrs) {
private var preventRefresh: Boolean = false
private var downY: Float = -1f
private val touchSlop = ViewConfiguration.get(context).scaledTouchSlop
private var nestedCanChildScrollUp: OnChildScrollUpCallback? = null
/**
* Copy of [canChildScrollUp], with additional support if necessary
*/
private val canChildScrollUp = OnChildScrollUpCallback { parent, child ->
nestedCanChildScrollUp?.canChildScrollUp(parent, child) ?: when (child) {
is WebView -> child.canScrollVertically(-1).apply {
L.d { "Webview can scroll up $this" }
}
is ListView -> ListViewCompat.canScrollList(child, -1)
// Supports webviews as well
else -> child?.canScrollVertically(-1) ?: false
}
}
init {
setOnChildScrollUpCallback(canChildScrollUp)
}
override fun setOnChildScrollUpCallback(callback: OnChildScrollUpCallback?) {
this.nestedCanChildScrollUp = callback
}
override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
if (ev.action != MotionEvent.ACTION_DOWN && preventRefresh) {
return false
}
when (ev.action) {
MotionEvent.ACTION_DOWN -> {
downY = ev.y
preventRefresh = canChildScrollUp()
}
MotionEvent.ACTION_MOVE -> {
if (downY - ev.y > touchSlop) {
preventRefresh = true
return false
}
}
}
return super.onInterceptTouchEvent(ev)
}
override fun onNestedScroll(
target: View,
dxConsumed: Int,
dyConsumed: Int,
dxUnconsumed: Int,
dyUnconsumed: Int
) {
if (preventRefresh) {
/*
* Ignoring offsetInWindow since
* 1. It doesn't seem to matter in the typical use case
* 2. It isn't being transferred to the underlying array used by the super class
*/
dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, null)
} else {
super.onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed)
}
}
}
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