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Snackbar Sample
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‎android/SnackSample/.gitignore

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*.iml
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.gradle
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/local.properties
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/.idea/caches
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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/.idea/navEditor.xml
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/.idea/assetWizardSettings.xml
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.DS_Store
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/build
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/captures
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.externalNativeBuild
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.cxx

‎android/SnackSample/app/.gitignore

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/build

‎android/SnackSample/app/build.gradle

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apply plugin: 'com.android.application'
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apply plugin: 'kotlin-android'
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apply plugin: 'kotlin-android-extensions'
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android {
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compileSdkVersion 29
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buildToolsVersion "29.0.2"
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defaultConfig {
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applicationId "br.com.nglauber.snacksample"
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minSdkVersion 21
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targetSdkVersion 29
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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implementation fileTree(dir: 'libs', include: ['*.jar'])
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implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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implementation 'androidx.appcompat:appcompat:1.0.2'
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implementation 'androidx.core:core-ktx:1.0.2'
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implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
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implementation 'com.google.android.material:material:1.1.0-alpha09'
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'androidx.test:runner:1.2.0'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
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}

‎android/SnackSample/app/proguard-rules.pro

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎android/SnackSample/app/src/androidTest/java/br/com/nglauber/snacksample/ExampleInstrumentedTest.kt

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package br.com.nglauber.snacksample
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import androidx.test.platform.app.InstrumentationRegistry
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import androidx.test.ext.junit.runners.AndroidJUnit4
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import org.junit.Test
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import org.junit.runner.RunWith
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import org.junit.Assert.*
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* See [testing documentation](http://d.android.com/tools/testing).
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*/
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@RunWith(AndroidJUnit4::class)
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class ExampleInstrumentedTest {
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@Test
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fun useAppContext() {
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// Context of the app under test.
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val appContext = InstrumentationRegistry.getInstrumentation().targetContext
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assertEquals("br.com.nglauber.snacksample", appContext.packageName)
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}
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}

‎android/SnackSample/app/src/main/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="br.com.nglauber.snacksample">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity
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android:name=".MainActivity"
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android:label="@string/app_name"
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android:theme="@style/AppTheme">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎android/SnackSample/app/src/main/java/br/com/nglauber/snacksample/FakeSnackBar.kt

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package br.com.nglauber.snacksample
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import android.content.Context
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import android.view.ViewTreeObserver
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import android.widget.Button
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import android.widget.TextView
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import androidx.annotation.LayoutRes
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class FakeSnackBar private constructor() {
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lateinit var swipeView: SwipeView
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private set
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private var viewReady = false
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private var showRequested = false
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fun show() {
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showRequested = true
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if (viewReady) {
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swipeView.show()
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}
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}
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fun dismiss() {
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showRequested = false
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swipeView.dismiss()
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}
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companion object {
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fun make(
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parent: ViewGroup,
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text: String,
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actionText: String? = null,
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action: (() -> Unit)? = null
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): FakeSnackBar {
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val snack = FakeSnackBar()
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val context = parent.context
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val swipeView = buildSwipeView(context, snack)
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val content = initDefaultContent(context, parent, text, actionText) {
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action?.invoke()
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snack.dismiss()
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}
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setupViews(swipeView, content, snack, parent)
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return snack
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}
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fun make(
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parent: ViewGroup,
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@LayoutRes layout: Int
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): FakeSnackBar {
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val snack = FakeSnackBar()
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val context = parent.context
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val swipeView = buildSwipeView(context, snack)
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val content = LayoutInflater.from(context)
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.inflate(layout, parent, false)
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setupViews(swipeView, content, snack, parent)
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return snack
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}
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private fun setupViews(
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swipeView: SwipeView,
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content: View?,
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snack: FakeSnackBar,
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parent: ViewGroup
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) {
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swipeView.addView(content)
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snack.swipeView = swipeView
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parent.addView(swipeView)
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}
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private fun buildSwipeView(context: Context, snack: FakeSnackBar): SwipeView {
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val swipeView = SwipeView(context).apply {
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visibility = View.INVISIBLE
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layoutParams = ViewGroup.LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.WRAP_CONTENT
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)
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}
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swipeView.viewTreeObserver.addOnGlobalLayoutListener(object :
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ViewTreeObserver.OnGlobalLayoutListener {
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override fun onGlobalLayout() {
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swipeView.viewTreeObserver.removeOnGlobalLayoutListener(this)
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snack.viewReady = true
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if (snack.showRequested) {
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snack.show()
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}
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}
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})
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return swipeView
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}
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private fun initDefaultContent(
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context: Context,
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parent: ViewGroup,
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message: String,
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textAction: String?,
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action: () -> Unit
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) = LayoutInflater
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.from(context)
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.inflate(R.layout.mysnack, parent, false).apply {
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findViewById<TextView>(R.id.txtMessage).text = message
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if (textAction != null) {
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findViewById<Button>(R.id.btnAction).apply {
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text = textAction
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setOnClickListener {
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action()
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}
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}
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}
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}
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}
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}

‎android/SnackSample/app/src/main/java/br/com/nglauber/snacksample/FloatingActionButtonBehavior.kt

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package br.com.nglauber.snacksample
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import android.content.Context
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import android.util.AttributeSet
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import android.view.View
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import androidx.coordinatorlayout.widget.CoordinatorLayout
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import com.google.android.material.floatingactionbutton.FloatingActionButton
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class FloatingActionButtonBehavior(context: Context, attrs: AttributeSet?) :
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CoordinatorLayout.Behavior<FloatingActionButton>(context, attrs) {
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override fun layoutDependsOn(
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parent: CoordinatorLayout,
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child: FloatingActionButton,
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dependency: View
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): Boolean {
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return dependency is SwipeView // here is key idea
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}
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override fun onDependentViewChanged(
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parent: CoordinatorLayout,
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child: FloatingActionButton,
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dependency: View
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): Boolean {
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child.translationY = (parent.height - dependency.translationY) * -1
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return true
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}
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override fun onDependentViewRemoved(
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parent: CoordinatorLayout,
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child: FloatingActionButton,
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dependency: View
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) {
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super.onDependentViewRemoved(parent, child, dependency)
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child.animate()
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.translationY(0f)
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.setDuration(200)
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.start()
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}
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}

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