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Improve BaseDynamicListUi FAB animation

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This commit is contained in:
Rocka 2025-11-02 20:25:30 +08:00
parent 4ad17d1891
commit bca654e8a8
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1 changed files with 30 additions and 18 deletions
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48
app/src/main/java/org/fcitx/fcitx5/android/ui/common/BaseDynamicListUi.kt
View File

@ -1,6 +1,6 @@
/*
* SPDX-License-Identifier: LGPL-2.1-or-later
* SPDX-FileCopyrightText: Copyright 2021-2023 Fcitx5 for Android Contributors
* SPDX-FileCopyrightText: Copyright 2021-2025 Fcitx5 for Android Contributors
*/
package org.fcitx.fcitx5.android.ui.common
@ -13,6 +13,7 @@ import android.widget.CheckBox
import android.widget.ImageButton
import androidx.activity.OnBackPressedDispatcher
import androidx.coordinatorlayout.widget.CoordinatorLayout
import androidx.core.content.ContextCompat
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import androidx.core.view.doOnAttach
@ -21,9 +22,8 @@ import androidx.core.view.updateLayoutParams
import androidx.core.widget.addTextChangedListener
import androidx.recyclerview.widget.ItemTouchHelper
import arrow.core.identity
import com.google.android.material.behavior.HideBottomViewOnScrollBehavior
import com.google.android.material.behavior.HideViewOnScrollBehavior
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.android.material.snackbar.BaseTransientBottomBar
import com.google.android.material.snackbar.Snackbar
import org.fcitx.fcitx5.android.R
import org.fcitx.fcitx5.android.utils.onPositiveButtonClick
@ -52,7 +52,6 @@ import splitties.views.dsl.recyclerview.recyclerView
import splitties.views.gravityEndBottom
import splitties.views.imageDrawable
import splitties.views.recyclerview.verticalLayoutManager
import kotlin.math.min
abstract class BaseDynamicListUi<T>(
override val ctx: Context,
@ -174,15 +173,6 @@ abstract class BaseDynamicListUi<T>(
action.invoke()
suspendUndo = false
}
.addCallback(object : BaseTransientBottomBar.BaseCallback<Snackbar>() {
override fun onShown(transientBottomBar: Snackbar) {
// snackbar is invisible when it attached to parent,
// but change visibility won't trigger `onDependentViewChanged`.
// so we need to update fab position when snackbar fully shown
// see [^1]
fab.translationY = -transientBottomBar.view.height.toFloat()
}
})
.show()
}
@ -310,7 +300,12 @@ abstract class BaseDynamicListUi<T>(
add(fab, defaultLParams {
gravity = gravityEndBottom
margin = dp(16)
behavior = object : HideBottomViewOnScrollBehavior<FloatingActionButton>() {
behavior = object : HideViewOnScrollBehavior<FloatingActionButton>(EDGE_BOTTOM) {
/**
* the `translationY` FAB needs to be shown above the snackbar
*/
var scrollInOffset = 0f
@SuppressLint("RestrictedApi")
override fun layoutDependsOn(
parent: CoordinatorLayout,
@ -325,10 +320,11 @@ abstract class BaseDynamicListUi<T>(
child: FloatingActionButton,
dependency: View
): Boolean {
scrollInOffset = dependency.translationY - dependency.height
// [^1]: snackbar is invisible when it attached to parent
// update fab position only when snackbar is visible
if (dependency.isVisible) {
child.translationY = min(0f, dependency.translationY - dependency.height)
// update FAB position only when snackbar is visible
if (isScrolledIn && dependency.isVisible) {
child.translationY = scrollInOffset
return true
}
return false
@ -339,7 +335,23 @@ abstract class BaseDynamicListUi<T>(
child: FloatingActionButton,
dependency: View
) {
child.translationY = 0f
// if the user dismiss the snackbar manually while FAB is visible,
// move the FAB back to its normal position
if (isScrolledIn) {
child.animate().translationY(0f)
}
}
}.apply {
addOnScrollStateChangedListener { view, _ ->
// overwrite FAB's position when scrolling in while snackbar is visible
if (isScrolledIn && scrollInOffset < 0f) {
// need to post because `HideViewOnScrollBehavior#slideIn` starts animation
// after notifying all onScrollStateChangedListeners
ContextCompat.getMainExecutor(ctx).execute {
view.clearAnimation()
view.animate().translationY(scrollInOffset)
}
}
}
}
})