alexmprog’s gists

adam-hurwitz / Event.kt

Last active August 30, 2020 15:50

UDF - Kotlin Flow vs. Rx: OnEachEvent view effects with Flow

	/**
	* Used as a wrapper for data that is exposed via an observable that represents an event.
	* Developed by Jose Alcérreca.
	* See [https://gist.github.com/JoseAlcerreca/5b661f1800e1e654f07cc54fe87441af#file-event-kt]
	*/
	open class Event<out T>(private val content: T) {

	var hasBeenHandled = false
	private set // Allow external read but not write

discord-gists / PanelsPreLayoutViewUpdates.kt

Last active August 30, 2020 15:35

a simplified code example of how Discord's Android app maintains panel states through device rotations while applying view updates before onLayout

	class OverlappingPanelsLayout: FrameLayout {
	private lateinit var startPanel: View
	private lateinit var centerPanel: View
	private lateinit var endPanel: View
	private var pendingUpdate: (() -> Unit)? = null

	...

	private fun openStartPanel() {

discord-gists / PanelsHorizontalScrollingInChildViews.kt

Last active March 2, 2022 19:22

a simplified code example of how Discord's Android app selectively allows child views of OverlappingPanelsLayout to handle their own horizontal scrolls

	class PanelsChildGestureRegionObserver : View.OnLayoutChangeListener {
	...
	override fun onLayoutChange(
	view: View?,
	left: Int,
	top: Int,
	right: Int,
	bottom: Int,
	oldLeft: Int,
	oldTop: Int,

discord-gists / CustomPanelGestureDetection.kt

Last active March 2, 2022 19:16

a simplified code example for how Discord's Android app supports custom panel gesture detection

	class OverlappingPanelsLayout : FrameLayout {

	private var scrollingSlopPx: Float = 0f
	private var velocityTracker: VelocityTracker? = null

	private var isScrollingHorizontally = false
	private var xFromInterceptActionDown: Float = 0f
	private var yFromInterceptActionDown: Float = 0f

	... // initialize scrollingSlopPx and VelocityTracker

davidliu / FragmentViewModelFactory.kt

Created February 16, 2020 20:49

View model factory extensions

	import android.os.Bundle
	import androidx.fragment.app.Fragment
	import androidx.fragment.app.activityViewModels
	import androidx.fragment.app.viewModels
	import androidx.lifecycle.AbstractSavedStateViewModelFactory
	import androidx.lifecycle.SavedStateHandle
	import androidx.lifecycle.ViewModel
	import androidx.lifecycle.ViewModelProvider
	import androidx.savedstate.SavedStateRegistryOwner

marcellogalhardo / ActivityScope.kt

Last active January 20, 2021 10:11

Scoping Dagger Components with ViewModels

	@Scope
	@Retention(AnnotationRetention.RUNTIME)
	annotation class ActivityScope

objcode / ConcurrencyHelpers.kt

Last active February 19, 2026 14:35

Helpers to control concurrency for one shot requests using Kotlin coroutines.

	/* Copyright 2019 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
	*
	* https://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,

HansMuller / model_binding_demo.dart

Created December 14, 2018 23:05

	/*

	ModelBinding<T>: a simple class for binding a Flutter app to a immutable
	model of type T.

	This is a complete application. The app shows the state of an instance of
	MyModel in a button's label, and replaces its MyModel instance when the
	button is pressed.

	ModelBinding is an inherited widget that must be created in a context above

SabagRonen / Presentation.java

Created October 6, 2018 13:38

Why Should You Wrap LiveData With Your Own Abstraction

	interface MyGeneralObserver<T> {
	void notifyUpdate(T value);
	}

	interface ObservableViewState {
	void observeTitle(LifecycleOwner lifecycleOwner, MyGeneralObserver<String> observer);
	}

	interface IScreenPresenter extends ObservableViewState {
	void loadData();

premnirmal / FragmentDelegates.kt

Last active October 16, 2018 18:01

	/**
	* Delegate that sets and disposes the fragment's listener by casting it to the fragment's activity.
	*/
	class ParentActivityDelegate<T>(fragment: Fragment) : BaseParentDelegate<T>(fragment) {

	override fun extractValue(fragment: Fragment): T? = fragment.activity as? T
	}

	/**
	* Delegate that sets and disposes the fragment's listener by casting it to the fragment's

Alexandr Golovach alexmprog