Repo created

ui-utils/ToolbarBottomSheet/build.gradle.kts

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+plugins {
+    id(ThunderbirdPlugins.Library.android)
+}
+
+dependencies {
+    api(libs.androidx.appcompat)
+    api(libs.android.material)
+    api(libs.androidx.coordinatorlayout)
+
+    implementation(libs.androidx.annotation)
+    implementation(libs.androidx.fragment)
+    implementation(libs.androidx.lifecycle.viewmodel)
+}
+
+android {
+    namespace = "app.k9mail.ui.utils.bottomsheet"
+}

ui-utils/ToolbarBottomSheet/src/main/java/app/k9mail/ui/utils/bottomsheet/LayoutAwareBottomSheetBehavior.kt

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+package app.k9mail.ui.utils.bottomsheet
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import com.google.android.material.bottomsheet.BottomSheetBehavior
+import com.google.android.material.bottomsheet.BottomSheetBehavior.BottomSheetCallback
+
+/**
+ * Work around the fact that [BottomSheetCallback.onLayout] is not public.
+ */
+class LayoutAwareBottomSheetBehavior<V : View>(context: Context, attrs: AttributeSet?) :
+    BottomSheetBehavior<V>(context, attrs) {
+
+    private val callbacks = mutableSetOf<LayoutAwareBottomSheetCallback>()
+
+    internal fun addBottomSheetCallback(callback: LayoutAwareBottomSheetCallback) {
+        callbacks.add(callback)
+        super.addBottomSheetCallback(callback)
+    }
+
+    internal fun removeBottomSheetCallback(callback: LayoutAwareBottomSheetCallback) {
+        super.removeBottomSheetCallback(callback)
+        callbacks.remove(callback)
+    }
+
+    override fun onLayoutChild(parent: CoordinatorLayout, child: V, layoutDirection: Int): Boolean {
+        val layoutResult = super.onLayoutChild(parent, child, layoutDirection)
+
+        for (callback in callbacks) {
+            callback.onBottomSheetLayout(child)
+        }
+
+        return layoutResult
+    }
+
+    companion object {
+        fun <V : View> from(view: V): LayoutAwareBottomSheetBehavior<V> {
+            val params = view.layoutParams
+            require(params is CoordinatorLayout.LayoutParams) { "The view is not a child of CoordinatorLayout" }
+
+            val behavior = params.behavior
+            require(behavior is LayoutAwareBottomSheetBehavior<*>) {
+                "The view is not associated with ToolbarBottomSheetBehavior"
+            }
+
+            @Suppress("UNCHECKED_CAST")
+            return behavior as LayoutAwareBottomSheetBehavior<V>
+        }
+    }
+}

ui-utils/ToolbarBottomSheet/src/main/java/app/k9mail/ui/utils/bottomsheet/LayoutAwareBottomSheetCallback.kt

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+package app.k9mail.ui.utils.bottomsheet
+
+import android.view.View
+import com.google.android.material.bottomsheet.BottomSheetBehavior.BottomSheetCallback
+
+/**
+ * Extends [BottomSheetCallback] so we can notify listeners of layout events.
+ *
+ * See [LayoutAwareBottomSheetBehavior].
+ */
+internal abstract class LayoutAwareBottomSheetCallback : BottomSheetCallback() {
+    abstract fun onBottomSheetLayout(bottomSheet: View)
+}

ui-utils/ToolbarBottomSheet/src/main/java/app/k9mail/ui/utils/bottomsheet/ToolbarBottomSheetDialog.kt

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+/*
+ * Copyright (C) 2023 K-9 Mail contributors
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 app.k9mail.ui.utils.bottomsheet
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.graphics.Color
+import android.graphics.drawable.ColorDrawable
+import android.os.Build.VERSION
+import android.os.Build.VERSION_CODES
+import android.os.Bundle
+import android.util.TypedValue
+import android.view.View
+import android.view.ViewGroup
+import android.view.Window
+import android.view.WindowManager
+import android.widget.FrameLayout
+import androidx.annotation.LayoutRes
+import androidx.annotation.StyleRes
+import androidx.appcompat.app.AppCompatDialog
+import androidx.appcompat.widget.Toolbar
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.view.AccessibilityDelegateCompat
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsControllerCompat
+import androidx.core.view.accessibility.AccessibilityNodeInfoCompat
+import androidx.core.view.doOnLayout
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
+import com.google.android.material.bottomsheet.BottomSheetBehavior
+import com.google.android.material.bottomsheet.BottomSheetBehavior.BottomSheetCallback
+import com.google.android.material.color.MaterialColors
+import com.google.android.material.shape.MaterialShapeDrawable
+
+/**
+ * Modal bottom sheet that displays a toolbar when it is fully expanded. Only meant to be used with
+ * [ToolbarBottomSheetDialogFragment].
+ *
+ * Based on [com.google.android.material.bottomsheet.BottomSheetDialog].
+ */
+class ToolbarBottomSheetDialog internal constructor(context: Context, @StyleRes theme: Int) :
+    AppCompatDialog(context, getThemeResId(context, theme)) {
+
+    private var internalBehavior: LayoutAwareBottomSheetBehavior<FrameLayout>? = null
+    val behavior: LayoutAwareBottomSheetBehavior<*>
+        get() {
+            if (internalBehavior == null) {
+                ensureContainerAndBehavior()
+            }
+
+            return internalBehavior ?: error("Missing ToolbarBottomSheetBehavior")
+        }
+
+    private var container: FrameLayout? = null
+    private var coordinator: CoordinatorLayout? = null
+    private var bottomSheet: FrameLayout? = null
+
+    var toolbar: Toolbar? = null
+        private set
+
+    /**
+     * `true` if dismissing will perform the swipe down animation on the bottom sheet, rather than the window animation
+     * for the dialog.
+     */
+    var isDismissWithAnimation = false
+
+    private var toolbarVisibilityCallback: LayoutAwareBottomSheetCallback? = null
+
+    init {
+        // We hide the title bar for any style configuration. Otherwise, there will be a gap above the bottom sheet
+        // when it is expanded.
+        supportRequestWindowFeature(Window.FEATURE_NO_TITLE)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setCancelable(true)
+
+        val window = window
+        if (window != null) {
+            // The status bar should always be transparent because of the window animation.
+            window.statusBarColor = Color.TRANSPARENT
+            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
+
+            if (VERSION.SDK_INT < VERSION_CODES.M) {
+                // It can be transparent for API 23 and above because we will handle switching the status
+                // bar icons to light or dark as appropriate. For API 21 and API 22 we just set the
+                // translucent status bar.
+                window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
+            }
+
+            window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
+        }
+    }
+
+    override fun setContentView(@LayoutRes layoutResID: Int) {
+        error("Not supported")
+    }
+
+    override fun setContentView(view: View) {
+        super.setContentView(wrapInBottomSheet(view))
+    }
+
+    override fun setContentView(view: View, params: ViewGroup.LayoutParams?) {
+        error("Not supported")
+    }
+
+    override fun onStart() {
+        super.onStart()
+
+        internalBehavior?.let { behavior ->
+            if (behavior.state == BottomSheetBehavior.STATE_HIDDEN) {
+                behavior.state = BottomSheetBehavior.STATE_COLLAPSED
+            }
+        }
+    }
+
+    override fun onAttachedToWindow() {
+        super.onAttachedToWindow()
+
+        val window = window
+        if (window != null) {
+            container?.fitsSystemWindows = false
+            coordinator?.fitsSystemWindows = false
+
+            val flags = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+            window.decorView.systemUiVisibility = window.decorView.systemUiVisibility or flags
+        }
+    }
+
+    /**
+     * This function can be called from a few different use cases, including Swiping the dialog down or calling
+     * `dismiss()` from a `BottomSheetDialogFragment`, tapping outside a dialog, etc…
+     *
+     * The default animation to dismiss this dialog is a fade-out transition through a
+     * windowAnimation. Call `setDismissWithAnimation(true)` if you want to utilize the BottomSheet animation
+     * instead.
+     *
+     * If this function is called from a swipe down interaction, or dismissWithAnimation is false,
+     * then keep the default behavior.
+     *
+     * Else, since this is a terminal event which will finish this dialog, we override the attached
+     * [BottomSheetCallback] to call this function, after [BottomSheetBehavior.STATE_HIDDEN] is set. This
+     * will enforce the swipe down animation before canceling this dialog.
+     */
+    override fun cancel() {
+        val behavior = this.behavior
+
+        if (!isDismissWithAnimation || behavior.state == BottomSheetBehavior.STATE_HIDDEN) {
+            super.cancel()
+        } else {
+            behavior.setState(BottomSheetBehavior.STATE_HIDDEN)
+        }
+    }
+
+    private fun ensureContainerAndBehavior(): FrameLayout? {
+        if (container == null) {
+            val container = View.inflate(context, R.layout.design_bottom_sheet_dialog, null) as FrameLayout
+            this.container = container
+
+            coordinator = container.findViewById(R.id.coordinator) ?: error("View not found")
+            val bottomSheet = container.findViewById<FrameLayout>(R.id.design_bottom_sheet) ?: error("View not found")
+            this.bottomSheet = bottomSheet
+
+            toolbar = bottomSheet.findViewById(R.id.toolbar)
+
+            val behavior = LayoutAwareBottomSheetBehavior.from(bottomSheet).apply {
+                addBottomSheetCallback(cancelDialogCallback)
+                isHideable = true
+            }
+            this.internalBehavior = behavior
+
+            container.doOnLayout {
+                behavior.peekHeight = container.height / 2
+            }
+
+            bottomSheet.doOnLayout {
+                // Don't draw the toolbar underneath the status bar if the bottom sheet doesn't cover the whole screen
+                // anyway.
+                if (bottomSheet.width < container.width) {
+                    container.fitsSystemWindows = true
+                    coordinator?.fitsSystemWindows = true
+                    setToolbarVisibilityCallback(topInset = 0)
+                } else {
+                    container.fitsSystemWindows = false
+                    coordinator?.fitsSystemWindows = false
+                }
+            }
+        }
+
+        return container
+    }
+
+    @SuppressLint("ClickableViewAccessibility")
+    private fun wrapInBottomSheet(view: View): View {
+        ensureContainerAndBehavior()
+
+        val container = checkNotNull(container)
+        val coordinator = checkNotNull(coordinator)
+        val bottomSheet = checkNotNull(bottomSheet)
+
+        ViewCompat.setOnApplyWindowInsetsListener(bottomSheet) { _, windowInsets ->
+            val insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
+            val topInset = insets.top
+
+            setToolbarVisibilityCallback(topInset)
+
+            WindowInsetsCompat.CONSUMED
+        }
+
+        while (bottomSheet.childCount > NUMBER_OF_OWN_BOTTOM_SHEET_CHILDREN) {
+            bottomSheet.removeViewAt(0)
+        }
+
+        bottomSheet.addView(view, 0)
+
+        // We treat the CoordinatorLayout as outside the dialog though it is technically inside
+        coordinator.findViewById<View>(R.id.touch_outside).setOnClickListener {
+            if (isShowing) {
+                cancel()
+            }
+        }
+
+        // Handle accessibility events
+        ViewCompat.setAccessibilityDelegate(
+            bottomSheet,
+            object : AccessibilityDelegateCompat() {
+                override fun onInitializeAccessibilityNodeInfo(host: View, info: AccessibilityNodeInfoCompat) {
+                    super.onInitializeAccessibilityNodeInfo(host, info)
+
+                    info.addAction(AccessibilityNodeInfoCompat.ACTION_DISMISS)
+                    info.isDismissable = true
+                }
+
+                override fun performAccessibilityAction(host: View, action: Int, args: Bundle?): Boolean {
+                    if (action == AccessibilityNodeInfoCompat.ACTION_DISMISS) {
+                        cancel()
+                        return true
+                    }
+
+                    return super.performAccessibilityAction(host, action, args)
+                }
+            },
+        )
+
+        bottomSheet.setOnTouchListener { _, _ ->
+            // Consume the event and prevent it from falling through
+            true
+        }
+
+        return container
+    }
+
+    private fun setToolbarVisibilityCallback(topInset: Int) {
+        val window = checkNotNull(window)
+        val bottomSheet = checkNotNull(bottomSheet)
+        val toolbar = checkNotNull(toolbar)
+        val behavior = checkNotNull(internalBehavior)
+
+        toolbarVisibilityCallback?.let { oldCallback ->
+            behavior.removeBottomSheetCallback(oldCallback)
+        }
+
+        val windowInsetsController = WindowCompat.getInsetsController(window, bottomSheet)
+        val newCallback = ToolbarVisibilityCallback(windowInsetsController, toolbar, topInset, behavior)
+        behavior.addBottomSheetCallback(newCallback)
+
+        this.toolbarVisibilityCallback = newCallback
+    }
+
+    fun removeDefaultCallback() {
+        checkNotNull(internalBehavior).removeBottomSheetCallback(cancelDialogCallback)
+    }
+
+    private val cancelDialogCallback: BottomSheetCallback = object : BottomSheetCallback() {
+        override fun onStateChanged(bottomSheet: View, @BottomSheetBehavior.State newState: Int) {
+            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
+                cancel()
+            }
+        }
+
+        override fun onSlide(bottomSheet: View, slideOffset: Float) = Unit
+    }
+
+    private class ToolbarVisibilityCallback(
+        private val windowInsetsController: WindowInsetsControllerCompat,
+        private val toolbar: Toolbar,
+        private val topInset: Int,
+        private val behavior: BottomSheetBehavior<FrameLayout>,
+    ) : LayoutAwareBottomSheetCallback() {
+
+        private val lightStatusBar: Boolean = windowInsetsController.isAppearanceLightStatusBars
+        private var lightToolbar = false
+
+        init {
+            // Try to find the background color to automatically change the status bar icons so they will
+            // still be visible when the bottomsheet slides underneath the status bar.
+            val toolbarBackground = toolbar.background
+            val backgroundTint = if (toolbarBackground is MaterialShapeDrawable) {
+                toolbarBackground.fillColor
+            } else {
+                ViewCompat.getBackgroundTintList(toolbar)
+            }
+
+            lightToolbar = if (backgroundTint != null) {
+                // First check for a tint
+                MaterialColors.isColorLight(backgroundTint.defaultColor)
+            } else if (toolbar.background is ColorDrawable) {
+                // Then check for the background color
+                MaterialColors.isColorLight((toolbar.background as ColorDrawable).color)
+            } else {
+                // Otherwise don't change the status bar color
+                lightStatusBar
+            }
+        }
+
+        override fun onStateChanged(bottomSheet: View, newState: Int) {
+            handleToolbarVisibility(bottomSheet)
+        }
+
+        override fun onSlide(bottomSheet: View, slideOffset: Float) {
+            handleToolbarVisibility(bottomSheet)
+        }
+
+        override fun onBottomSheetLayout(bottomSheet: View) {
+            handleToolbarVisibility(bottomSheet)
+        }
+
+        private fun handleToolbarVisibility(bottomSheet: View) {
+            setToolbarState(bottomSheet)
+            setStatusBarColor(bottomSheet)
+        }
+
+        private fun setToolbarState(bottomSheet: View) {
+            val top = bottomSheet.top
+
+            val collapsedOffset = (bottomSheet.parent as View).height / 2
+            if (top >= collapsedOffset || behavior.expandedOffset > 0) {
+                toolbar.isInvisible = true
+                bottomSheet.setPadding(0, 0, 0, 0)
+                return
+            }
+
+            val toolbarHeight = toolbar.height - toolbar.paddingTop
+            val toolbarHeightAndInset = toolbarHeight + topInset
+            val expandedPercentage =
+                ((collapsedOffset - top).toFloat() / (collapsedOffset - behavior.expandedOffset)).coerceAtMost(1f)
+
+            // Add top padding to bottom sheet to make room for the toolbar
+            val paddingTop = (toolbarHeightAndInset * expandedPercentage).toInt().coerceAtLeast(0)
+            bottomSheet.setPadding(0, paddingTop, 0, 0)
+
+            // Start showing the toolbar when the bottom sheet is a toolbar height away from the top of the screen.
+            // This value was chosen rather arbitrarily because it looked nice enough.
+            val toolbarPercentage =
+                ((toolbarHeight - top).toFloat() / (toolbarHeight - behavior.expandedOffset)).coerceAtLeast(0f)
+
+            if (toolbarPercentage > 0) {
+                toolbar.isVisible = true
+
+                // Set the toolbar's top padding so the toolbar covers the bottom sheet's whole top padding
+                val toolbarPaddingTop = (paddingTop - toolbarHeight).coerceAtLeast(0)
+                toolbar.setPadding(0, toolbarPaddingTop, 0, 0)
+
+                // Translate the toolbar view so it is drawn on top of the bottom sheet's top padding
+                toolbar.translationY = -paddingTop.toFloat()
+
+                toolbar.alpha = toolbarPercentage
+            } else {
+                toolbar.isInvisible = true
+            }
+        }
+
+        private fun setStatusBarColor(bottomSheet: View) {
+            val toolbarLightThreshold = topInset / 2
+            if (bottomSheet.top < toolbarLightThreshold) {
+                windowInsetsController.isAppearanceLightStatusBars = lightToolbar
+            } else if (bottomSheet.top != 0) {
+                windowInsetsController.isAppearanceLightStatusBars = lightStatusBar
+            }
+        }
+    }
+
+    companion object {
+        private const val NUMBER_OF_OWN_BOTTOM_SHEET_CHILDREN = 1
+
+        private fun getThemeResId(context: Context, themeId: Int): Int {
+            if (themeId != 0) return themeId
+
+            val outValue = TypedValue()
+
+            val wasAttributeResolved = context.theme.resolveAttribute(
+                com.google.android.material.R.attr.bottomSheetDialogTheme,
+                outValue,
+                true,
+            )
+
+            return if (wasAttributeResolved) {
+                outValue.resourceId
+            } else {
+                error("Missing bottomSheetDialogTheme attribute in theme")
+            }
+        }
+    }
+}

ui-utils/ToolbarBottomSheet/src/main/java/app/k9mail/ui/utils/bottomsheet/ToolbarBottomSheetDialogFragment.kt

@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2023 K-9 Mail contributors
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 app.k9mail.ui.utils.bottomsheet
+
+import android.app.Dialog
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatDialogFragment
+import androidx.appcompat.widget.Toolbar
+import com.google.android.material.bottomsheet.BottomSheetBehavior
+
+/**
+ * Modal bottom sheet that displays a toolbar when it is fully expanded.
+ *
+ * Based on [com.google.android.material.bottomsheet.BottomSheetDialogFragment].
+ */
+open class ToolbarBottomSheetDialogFragment : AppCompatDialogFragment() {
+    /**
+     * Tracks if we are waiting for a dismissAllowingStateLoss or a regular dismiss once the BottomSheet is hidden and
+     * onStateChanged() is called.
+     */
+    private var waitingForDismissAllowingStateLoss = false
+
+    val toolbar: Toolbar?
+        get() = dialog?.toolbar
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        return ToolbarBottomSheetDialog(requireContext(), theme)
+    }
+
+    override fun dismiss() {
+        if (!tryDismissWithAnimation(false)) {
+            super.dismiss()
+        }
+    }
+
+    override fun dismissAllowingStateLoss() {
+        if (!tryDismissWithAnimation(true)) {
+            super.dismissAllowingStateLoss()
+        }
+    }
+
+    override fun getDialog(): ToolbarBottomSheetDialog? {
+        return super.getDialog() as ToolbarBottomSheetDialog?
+    }
+
+    /**
+     * Tries to dismiss the dialog fragment with the bottom sheet animation. Returns true if possible, false otherwise.
+     */
+    private fun tryDismissWithAnimation(allowingStateLoss: Boolean): Boolean {
+        val dialog = dialog
+        if (dialog != null) {
+            val behavior = dialog.behavior
+            if (behavior.isHideable && dialog.isDismissWithAnimation) {
+                dismissWithAnimation(behavior, allowingStateLoss)
+                return true
+            }
+        }
+
+        return false
+    }
+
+    private fun dismissWithAnimation(behavior: BottomSheetBehavior<*>, allowingStateLoss: Boolean) {
+        waitingForDismissAllowingStateLoss = allowingStateLoss
+
+        if (behavior.state == BottomSheetBehavior.STATE_HIDDEN) {
+            dismissAfterAnimation()
+        } else {
+            dialog?.removeDefaultCallback()
+            behavior.addBottomSheetCallback(BottomSheetDismissCallback())
+            behavior.setState(BottomSheetBehavior.STATE_HIDDEN)
+        }
+    }
+
+    private fun dismissAfterAnimation() {
+        if (waitingForDismissAllowingStateLoss) {
+            super.dismissAllowingStateLoss()
+        } else {
+            super.dismiss()
+        }
+    }
+
+    private inner class BottomSheetDismissCallback : BottomSheetBehavior.BottomSheetCallback() {
+        override fun onStateChanged(bottomSheet: View, newState: Int) {
+            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
+                dismissAfterAnimation()
+            }
+        }
+
+        override fun onSlide(bottomSheet: View, slideOffset: Float) = Unit
+    }
+}

ui-utils/ToolbarBottomSheet/src/main/res/layout/design_bottom_sheet_dialog.xml

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2023 K-9 Mail contributors
+  ~ Copyright (C) 2015 The Android Open Source Project
+  ~
+  ~ 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.
+-->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fitsSystemWindows="true">
+
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
+        android:id="@+id/coordinator"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:fitsSystemWindows="true">
+
+        <View
+            android:id="@+id/touch_outside"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:focusable="false"
+            android:importantForAccessibility="no"
+            android:soundEffectsEnabled="false"
+            tools:ignore="UnusedAttribute" />
+
+        <FrameLayout
+            android:id="@+id/design_bottom_sheet"
+            style="?attr/bottomSheetStyle"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal|top"
+            android:clipChildren="false"
+            android:clipToPadding="false"
+            app:layout_behavior="app.k9mail.ui.utils.bottomsheet.LayoutAwareBottomSheetBehavior">
+
+            <com.google.android.material.appbar.MaterialToolbar
+                android:id="@+id/toolbar"
+                style="?attr/toolbarStyle"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:visibility="invisible" />
+
+        </FrameLayout>
+
+    </androidx.coordinatorlayout.widget.CoordinatorLayout>
+
+</FrameLayout>