74 lines
2.9 KiB
Kotlin
74 lines
2.9 KiB
Kotlin
/* Copyright 2019 Joel Pyska
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.util
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import android.content.Context
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import android.util.AttributeSet
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import android.view.MotionEvent
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import com.google.android.material.appbar.AppBarLayout
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import androidx.coordinatorlayout.widget.CoordinatorLayout
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import android.view.View
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import android.view.ViewGroup
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import androidx.recyclerview.widget.RecyclerView
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/**
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* Disable AppBar scroll if content view empty or don't need to scroll
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*/
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class AppBarLayoutNoEmptyScrollBehavior : AppBarLayout.Behavior {
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constructor() : super()
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constructor (context: Context, attrs: AttributeSet) : super(context, attrs)
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private fun isRecyclerViewScrollable(appBar: AppBarLayout, recyclerView: RecyclerView?): Boolean {
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if (recyclerView == null)
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return false
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var recyclerViewHeight = recyclerView.height // Height includes RecyclerView plus AppBarLayout at same level
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val appCompatHeight = appBar.height
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recyclerViewHeight -= appCompatHeight
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return recyclerView.computeVerticalScrollRange() > recyclerViewHeight
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}
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override fun onStartNestedScroll(parent: CoordinatorLayout, child: AppBarLayout, directTargetChild: View, target: View, nestedScrollAxes: Int, type: Int): Boolean {
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return if (isRecyclerViewScrollable(child, getRecyclerView(parent))) {
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super.onStartNestedScroll(parent, child, directTargetChild, target, nestedScrollAxes, type)
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} else false
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}
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override fun onTouchEvent(parent: CoordinatorLayout, child: AppBarLayout, ev: MotionEvent): Boolean {
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//Prevent scroll on app bar drag
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return if (child.isShown && !isRecyclerViewScrollable(child, getRecyclerView(parent)))
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true
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else
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super.onTouchEvent(parent, child, ev)
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}
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private fun getRecyclerView(parent: ViewGroup): RecyclerView? {
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for (i in 0 until parent.childCount) {
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val child = parent.getChildAt(i)
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if (child is RecyclerView)
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return child
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else if (child is ViewGroup) {
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val childRecyclerView = getRecyclerView(child)
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if (childRecyclerView is RecyclerView)
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return childRecyclerView
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}
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}
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return null
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}
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} |