New implementation of ObservableList<T>

1 files changed, 206 insertions, 0 deletions

diff --git a/src/main/kotlin/pl/treksoft/kvision/utils/ObservableList.kt b/src/main/kotlin/pl/treksoft/kvision/utils/ObservableList.kt
new file mode 100644
index 00000000..193cd575
--- /dev/null
+++ b/src/main/kotlin/pl/treksoft/kvision/utils/ObservableList.kt
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2017-present Robert Jaros
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package pl.treksoft.kvision.utils
+
+/**
+ * Observable list interface.
+ */
+interface ObservableList<T> : MutableList<T> {
+    val onUpdate: MutableCollection<(MutableList<T>) -> Unit>
+}
+
+/**
+ * Simple observable list implementation.
+ */
+class ObservableListWrapper<T>(val mutableList: MutableList<T> = mutableListOf()) : MutableList<T>, ObservableList<T> {
+
+    override val onUpdate: MutableCollection<(MutableList<T>) -> Unit> = mutableListOf()
+
+    override val size: Int
+        get() = mutableList.size
+
+    override fun contains(element: T): Boolean {
+        return mutableList.contains(element)
+    }
+
+    override fun containsAll(elements: Collection<T>): Boolean {
+        return mutableList.containsAll(elements)
+    }
+
+    override fun get(index: Int): T {
+        return mutableList[index]
+    }
+
+    override fun indexOf(element: T): Int {
+        return mutableList.indexOf(element)
+    }
+
+    override fun isEmpty(): Boolean {
+        return mutableList.isEmpty()
+    }
+
+    override fun iterator(): MutableIterator<T> = object : MutableIterator<T> {
+        val inner = mutableList.iterator()
+        override fun hasNext(): Boolean = inner.hasNext()
+        override fun next(): T = inner.next()
+        override fun remove() {
+            inner.remove()
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+    }
+
+    override fun lastIndexOf(element: T): Int {
+        return mutableList.lastIndexOf(element)
+    }
+
+    override fun listIterator(): MutableListIterator<T> = object : MutableListIterator<T> {
+        val inner = mutableList.listIterator()
+
+        override fun hasNext() = inner.hasNext()
+        override fun next() = inner.next()
+        override fun hasPrevious() = inner.hasPrevious()
+        override fun nextIndex() = inner.nextIndex()
+        override fun previous() = inner.previous()
+        override fun previousIndex() = inner.previousIndex()
+
+        override fun add(element: T) {
+            inner.add(element)
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+
+        override fun set(element: T) {
+            inner.set(element)
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+
+        override fun remove() {
+            inner.remove()
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+    }
+
+    override fun listIterator(index: Int): MutableListIterator<T> = object : MutableListIterator<T> {
+        val inner = mutableList.listIterator(index)
+
+        override fun hasNext() = inner.hasNext()
+        override fun next() = inner.next()
+        override fun hasPrevious() = inner.hasPrevious()
+        override fun nextIndex() = inner.nextIndex()
+        override fun previous() = inner.previous()
+        override fun previousIndex() = inner.previousIndex()
+
+        override fun add(element: T) {
+            inner.add(element)
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+
+        override fun set(element: T) {
+            inner.set(element)
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+
+        override fun remove() {
+            inner.remove()
+            onUpdate.forEach { it(this@ObservableListWrapper) }
+        }
+    }
+
+    override fun subList(fromIndex: Int, toIndex: Int): MutableList<T> {
+        return mutableList.subList(fromIndex, toIndex)
+    }
+
+    override fun add(element: T): Boolean {
+        val result = mutableList.add(element)
+        if (result) {
+            onUpdate.forEach { it(this) }
+        }
+        return result
+    }
+
+    override fun add(index: Int, element: T) {
+        mutableList.add(index, element)
+        onUpdate.forEach { it(this) }
+    }
+
+    override fun addAll(elements: Collection<T>): Boolean {
+        val result = mutableList.addAll(elements)
+        if (result) {
+            onUpdate.forEach { it(this) }
+        }
+        return result
+    }
+
+    override fun addAll(index: Int, elements: Collection<T>): Boolean {
+        val result = mutableList.addAll(index, elements)
+        if (result) {
+            onUpdate.forEach { it(this) }
+        }
+        return result
+    }
+
+    override fun clear() {
+        mutableList.clear()
+        onUpdate.forEach { it(this) }
+    }
+
+    override fun remove(element: T): Boolean {
+        val result = mutableList.remove(element)
+        if (result) {
+            onUpdate.forEach { it(this) }
+        }
+        return result
+    }
+
+    override fun removeAt(index: Int): T {
+        val result = mutableList.removeAt(index)
+        onUpdate.forEach { it(this) }
+        return result
+    }
+
+    override fun removeAll(elements: Collection<T>): Boolean {
+        val result = mutableList.removeAll(elements)
+        if (result) {
+            onUpdate.forEach { it(this) }
+        }
+        return result
+    }
+
+    override fun retainAll(elements: Collection<T>): Boolean {
+        val result = mutableList.retainAll(elements)
+        if (result) {
+            onUpdate.forEach { it(this) }
+        }
+        return result
+    }
+
+    override fun set(index: Int, element: T): T {
+        val result = mutableList.set(index, element)
+        onUpdate.forEach { it(this) }
+        return result
+    }
+}
+
+/**
+ * Creates an instance of ObservableList<T>
+ */
+fun <T> observableListOf(vararg items: T) = ObservableListWrapper(items.toMutableList())