Merge pull request #31 from InsanusMokrassar/0.4.12

0.4.12

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.4.12
+
+* `Coroutines`
+    * `JVM`
+        * Update `launchSynchronously` signature
+* `Selector`
+    * Project created
+
 ## 0.4.11
 
 * `Common`

README.md

@@ -17,6 +17,7 @@ You always can look at the <a href="https://github.com/InsanusMokrassar/MicroUti
 ## Projects
 
 * `common` contains common tools for platform which usually are absent out-of-the-box when you starting project
+* `selector` contains tools to use `Selector` interface with things like `RecyclerView` in android or other selection needs
 * `coroutines` is a module for `Kotlin Coroutines` with different things like subscribing on flows (`onEach` + `launchIn` shortcut :) )
 * `ktor` is a set of modules for `client`s and `server`s
 * `mime_types` is NOT lightweight set of `MimeType`s with a lot of different objected and serializable (with `Kotlin Serialization`) mime types

coroutines/src/jvmMain/kotlin/dev/inmo/micro_utils/coroutines/LaunchSynchronously.kt

@@ -2,12 +2,12 @@ package dev.inmo.micro_utils.coroutines
 
 import kotlinx.coroutines.*
 
-fun <T> launchSynchronously(scope: CoroutineScope = CoroutineScope(Dispatchers.Default), block: suspend CoroutineScope.() -> T): T {
+fun <T> CoroutineScope.launchSynchronously(block: suspend CoroutineScope.() -> T): T {
     var throwable: Throwable? = null
     var result: T? = null
     val objectToSynchronize = java.lang.Object()
     val launchCallback = {
-        scope.launch {
+        launch {
             safely(
                 {
                     throwable = it
@@ -26,3 +26,5 @@ fun <T> launchSynchronously(scope: CoroutineScope = CoroutineScope(Dispatchers.D
     }
     throw throwable ?: return result!!
 }
+
+fun <T> launchSynchronously(block: suspend CoroutineScope.() -> T): T = CoroutineScope(Dispatchers.Default).launchSynchronously(block)

gradle.properties

@@ -40,5 +40,5 @@ dokka_version=1.4.20
 # Project data
 
 group=dev.inmo
-version=0.4.11
+version=0.4.12
-android_code_version=15
+android_code_version=16

selector/common/build.gradle

@@ -0,0 +1,17 @@
+plugins {
+    id "org.jetbrains.kotlin.multiplatform"
+    id "org.jetbrains.kotlin.plugin.serialization"
+    id "com.android.library"
+}
+
+apply from: "$mppProjectWithSerializationPresetPath"
+
+kotlin {
+    sourceSets {
+        commonMain {
+            dependencies {
+                api "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
+            }
+        }
+    }
+}

selector/common/src/commonMain/kotlin/dev/inmo/micro_utils/selector/Selector.kt

@@ -0,0 +1,168 @@
+package dev.inmo.micro_utils.selector
+
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.sync.Mutex
+
+/**
+ * Unified interface which can be used in any system which require some selection functionality
+ */
+interface Selector<T> {
+    val selectedItems: List<T>
+    val itemSelected: SharedFlow<T>
+    val itemUnselected: SharedFlow<T>
+
+    suspend fun toggleSelection(element: T)
+    suspend fun forceSelect(element: T)
+    suspend fun forceDeselect(element: T)
+    suspend fun clearSelection()
+}
+
+@Suppress("NOTHING_TO_INLINE")
+inline operator fun <T> Selector<T>.contains(element: T) = selectedItems.contains(element)
+@Suppress("NOTHING_TO_INLINE")
+inline fun <T> Selector<T>.nothingSelected(): Boolean = selectedItems.isEmpty()
+suspend inline fun <T> Selector<T>.toggleSelection(elements: List<T>) = elements.forEach { toggleSelection(it) }
+suspend inline fun <T> Selector<T>.forceSelect(elements: List<T>) = elements.forEach { forceSelect(it) }
+suspend inline fun <T> Selector<T>.forceDeselect(elements: List<T>) = elements.forEach { forceDeselect(it) }
+suspend inline fun <T> Selector<T>.toggleSelection(firstElement: T, vararg elements: T) = toggleSelection(listOf(firstElement) + elements.toList())
+suspend inline fun <T> Selector<T>.forceSelect(firstElement: T, vararg elements: T) = forceSelect(listOf(firstElement) + elements.toList())
+suspend inline fun <T> Selector<T>.forceDeselect(firstElement: T, vararg elements: T) = forceDeselect(listOf(firstElement) + elements.toList())
+
+/**
+ * Realization of [Selector] with one or without selected element. This realization will always have empty
+ * [selectedItems] when nothing selected and one element in [selectedItems] when something selected. Contains
+ * [selectedItem] value for simple access to currently selected item.
+ *
+ * On calling of [toggleSelection] previous selection will be erased and [itemUnselected] will emit this element.
+ *
+ * @param safeChanges Set to false to disable using of [mutex] for synchronizing changes on [toggleSelection]
+ */
+class SingleSelector<T>(
+    selectedItem: T? = null,
+    safeChanges: Boolean = true
+) : Selector<T> {
+    var selectedItem: T? = selectedItem
+        private set
+    override val selectedItems: List<T>
+        get() = selectedItem ?.let { listOf(it) } ?: emptyList()
+
+    private val _itemSelected = MutableSharedFlow<T>()
+    override val itemSelected: SharedFlow<T> = _itemSelected.asSharedFlow()
+    private val _itemUnselected = MutableSharedFlow<T>()
+    override val itemUnselected: SharedFlow<T> = _itemUnselected.asSharedFlow()
+
+    private val mutex = if (safeChanges) {
+        Mutex()
+    } else {
+        null
+    }
+
+    override suspend fun forceDeselect(element: T) {
+        mutex ?.lock()
+        if (selectedItem == element) {
+            selectedItem = null
+            _itemUnselected.emit(element)
+        }
+        mutex ?.unlock()
+    }
+
+    override suspend fun forceSelect(element: T) {
+        mutex ?.lock()
+        if (selectedItem != element) {
+            selectedItem = element
+            _itemSelected.emit(element)
+        }
+        mutex ?.unlock()
+    }
+
+    override suspend fun toggleSelection(element: T) {
+        mutex ?.lock()
+        if (selectedItem == element) {
+            selectedItem = null
+            _itemUnselected.emit(element)
+        } else {
+            val previouslySelected = selectedItem
+            selectedItem = null
+            if (previouslySelected != null) {
+                _itemUnselected.emit(previouslySelected)
+            }
+            selectedItem = element
+            _itemSelected.emit(element)
+        }
+        mutex ?.unlock()
+    }
+
+    override suspend fun clearSelection() {
+        selectedItem ?.let { forceDeselect(it) }
+    }
+}
+
+/**
+ * Realization of [Selector] with multiple selected elements. On calling of [toggleSelection] this realization will select passed element OR deselect it if it is already in
+ * [selectedItems]
+ *
+ * @param safeChanges Set to false to disable using of [mutex] for synchronizing changes on [toggleSelection]
+ */
+class MultipleSelector<T>(
+    selectedItems: List<T> = emptyList(),
+    safeChanges: Boolean = true
+) : Selector<T> {
+    private val _selectedItems: MutableList<T> = selectedItems.toMutableList()
+    override val selectedItems: List<T> = _selectedItems
+
+    private val _itemSelected = MutableSharedFlow<T>()
+    override val itemSelected: SharedFlow<T> = _itemSelected.asSharedFlow()
+    private val _itemUnselected = MutableSharedFlow<T>()
+    override val itemUnselected: SharedFlow<T> = _itemUnselected.asSharedFlow()
+
+    private val mutex = if (safeChanges) {
+        Mutex()
+    } else {
+        null
+    }
+
+    override suspend fun forceDeselect(element: T) {
+        mutex ?.lock()
+        if (_selectedItems.remove(element)) {
+            _itemUnselected.emit(element)
+        }
+        mutex ?.unlock()
+    }
+
+    override suspend fun forceSelect(element: T) {
+        mutex ?.lock()
+        if (element !in _selectedItems && _selectedItems.add(element)) {
+            _itemSelected.emit(element)
+        }
+        mutex ?.unlock()
+    }
+
+    override suspend fun toggleSelection(element: T) {
+        mutex ?.lock()
+        if (_selectedItems.remove(element)) {
+            _itemUnselected.emit(element)
+        } else {
+            _selectedItems.add(element)
+            _itemSelected.emit(element)
+        }
+        mutex ?.unlock()
+    }
+
+    override suspend fun clearSelection() {
+        mutex ?.lock()
+        val preSelectedItems = _selectedItems.toList()
+        _selectedItems.clear()
+        preSelectedItems.forEach { _itemUnselected.emit(it) }
+        mutex ?.unlock()
+    }
+}
+
+@Suppress("FunctionName", "NOTHING_TO_INLINE")
+inline fun <T> Selector(
+    multiple: Boolean,
+    safeChanges: Boolean = true
+): Selector<T> = if (multiple) {
+    MultipleSelector(safeChanges = safeChanges)
+} else {
+    SingleSelector(safeChanges = safeChanges)
+}

selector/common/src/commonMain/kotlin/dev/inmo/micro_utils/selector/SelectorItemsFlow.kt

@@ -0,0 +1,17 @@
+package dev.inmo.micro_utils.selector
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.*
+
+/**
+ * @return Returned [SharedFlow] will emit true when [element] has been selected in [this] [Selector] and will emit
+ * false when this [element] was deselected
+ *
+ * @see [Selector]
+ * @see [Selector.itemSelected]
+ * @see [Selector.itemUnselected]
+ */
+fun <T> Selector<T>.itemSelectionFlow(element: T, scope: CoroutineScope): SharedFlow<Boolean> = MutableSharedFlow<Boolean>().apply {
+    itemSelected.onEach { if (it == element) emit(true) }.launchIn(scope)
+    itemUnselected.onEach { if (it == element) emit(false) }.launchIn(scope)
+}.asSharedFlow()

selector/common/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest package="dev.inmo.micro_utils.selector"/>

settings.gradle

@@ -2,6 +2,7 @@ rootProject.name='micro_utils'
 
 String[] includes = [
     ":common",
+    ":selector:common",
     ":pagination:common",
     ":pagination:exposed",
     ":pagination:ktor:common",