121 lines
4.1 KiB
Kotlin
121 lines
4.1 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.browser
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import android.animation.ValueAnimator
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import android.content.Context
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import android.util.AttributeSet
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import android.view.Gravity
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import android.view.View
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import android.view.View.SCROLL_AXIS_VERTICAL
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import android.view.animation.DecelerateInterpolator
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import androidx.coordinatorlayout.widget.CoordinatorLayout
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import androidx.core.view.ViewCompat.TYPE_NON_TOUCH
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import androidx.core.view.ViewCompat.TYPE_TOUCH
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import com.google.android.material.snackbar.Snackbar
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import mozilla.components.browser.toolbar.BrowserToolbar
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import org.mozilla.fenix.R
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import kotlin.math.max
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import kotlin.math.min
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private const val SNAP_ANIMATION_DURATION = 150L
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/**
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* A [CoordinatorLayout.Behavior] implementation to be used when placing [BrowserToolbar] at the top of the screen.
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*
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* This implementation will:
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* - Show/Hide the [BrowserToolbar] automatically when scrolling vertically.
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* - On showing a [Snackbar] position it above the [BrowserToolbar].
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* - Snap the [BrowserToolbar] to be hidden or visible when the user stops scrolling.
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*/
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class BrowserToolbarTopBehavior(
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context: Context?,
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attrs: AttributeSet?
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) : CoordinatorLayout.Behavior<BrowserToolbar>(context, attrs) {
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// This implementation is heavily based on this blog article:
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// https://android.jlelse.eu/scroll-your-bottom-navigation-view-away-with-10-lines-of-code-346f1ed40e9e
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internal var shouldSnapAfterScroll: Boolean = false
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internal var snapAnimator: ValueAnimator = ValueAnimator().apply {
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interpolator = DecelerateInterpolator()
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duration = SNAP_ANIMATION_DURATION
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}
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fun forceExpand(view: View) {
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animateSnap(view, SnapDirection.DOWN)
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}
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override fun onStartNestedScroll(
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coordinatorLayout: CoordinatorLayout,
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child: BrowserToolbar,
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directTargetChild: View,
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target: View,
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axes: Int,
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type: Int
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): Boolean {
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return if (axes == SCROLL_AXIS_VERTICAL) {
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shouldSnapAfterScroll = type == TYPE_TOUCH
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snapAnimator.cancel()
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true
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} else {
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false
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}
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}
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override fun onStopNestedScroll(
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coordinatorLayout: CoordinatorLayout,
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child: BrowserToolbar,
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target: View,
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type: Int
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) {
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if (shouldSnapAfterScroll || type == TYPE_NON_TOUCH) {
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if (child.translationY >= (-child.height / 2f)) {
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animateSnap(child, SnapDirection.DOWN)
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} else {
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animateSnap(child, SnapDirection.UP)
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}
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}
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}
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override fun onNestedPreScroll(
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coordinatorLayout: CoordinatorLayout,
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child: BrowserToolbar,
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target: View,
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dx: Int,
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dy: Int,
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consumed: IntArray,
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type: Int
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) {
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super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type)
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child.translationY = max(-child.height.toFloat(), min(0f, child.translationY - dy))
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}
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override fun layoutDependsOn(parent: CoordinatorLayout, child: BrowserToolbar, dependency: View): Boolean {
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if (dependency is Snackbar.SnackbarLayout) {
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positionSnackbar(dependency)
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}
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return super.layoutDependsOn(parent, child, dependency)
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}
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private fun animateSnap(child: View, direction: SnapDirection) = with(snapAnimator) {
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addUpdateListener { child.translationY = it.animatedValue as Float }
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setFloatValues(child.translationY, if (direction == SnapDirection.DOWN) 0f else -child.height.toFloat())
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start()
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}
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private fun positionSnackbar(view: View) {
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val params = view.layoutParams as CoordinatorLayout.LayoutParams
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// Position the snackbar below the toolbar so that it doesn't overlay the toolbar.
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params.anchorId = R.id.toolbar
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params.anchorGravity = Gravity.BOTTOM or Gravity.CENTER_HORIZONTAL
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params.gravity = Gravity.BOTTOM or Gravity.CENTER_HORIZONTAL
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view.layoutParams = params
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}
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}
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