Adapter concept

expandable-recyclerview/build.gradle

@@ -15,7 +15,7 @@ android {
         minSdkVersion 23
         targetSdkVersion 29
         versionCode 1
-        versionName "0.0.1-alpha01"
+        versionName "0.0.1-alpha02"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         consumerProguardFiles 'consumer-rules.pro'
@@ -35,7 +35,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.core:core-ktx:1.1.0'
     implementation "androidx.recyclerview:recyclerview:1.1.0"
-    implementation "com.github.adriankuta:tree-structure:1.1.0"
+    implementation "com.github.adriankuta:tree-structure:1.2.0"
 
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'

expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableGroup.kt

@@ -1,19 +0,0 @@
-package com.github.adriankuta.expandable_recyclerview
-
-import com.github.adriankuta.datastructure.tree.TreeNode
-
-open class ExpandableGroup<T>(value: T) : TreeNode<T>(value) {
-
-    private var _isExpanded = false
-    val isExpanded: Boolean
-        get() = _isExpanded
-
-
-    open fun expand() {
-        _isExpanded = true
-    }
-
-    open fun collapse() {
-        _isExpanded = false
-    }
-}

expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableRecyclerView.kt

@@ -1,12 +0,0 @@
-package com.github.adriankuta.expandable_recyclerview
-
-import android.content.Context
-import android.util.AttributeSet
-import androidx.recyclerview.widget.RecyclerView
-
-class ExpandableRecyclerView @JvmOverloads constructor(
-    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
-) : RecyclerView(context, attrs, defStyleAttr) {
-
-
-}

expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableTreeNode.kt

@@ -0,0 +1,38 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import com.github.adriankuta.datastructure.tree.ChildDeclaration
+import com.github.adriankuta.datastructure.tree.TreeNode
+
+class ExpandableTreeNode<T>(value: T) : TreeNode<T>(value) {
+
+    var expanded: Boolean = true
+        set(value) {
+            field = value
+            children.forEach {
+                (it as ExpandableTreeNode).expanded = value
+            }
+        }
+
+    override fun child(value: T, childDeclaration: ChildDeclaration<T>?) {
+        val newChild = ExpandableTreeNode(value)
+        if (childDeclaration != null)
+            newChild.childDeclaration()
+        addChild(newChild)
+    }
+
+    fun getVisibleNodeCount(): Int {
+        return onlyVisibleItems()
+            .size
+    }
+
+    fun getVisibleNode(position: Int): ExpandableTreeNode<T> {
+        return onlyVisibleItems()[position]
+    }
+
+    private fun onlyVisibleItems(): List<ExpandableTreeNode<T>> {
+        //Visible if parent of node is expanded.
+        return map { it as ExpandableTreeNode }
+            .filter { (it.parent as? ExpandableTreeNode)?.expanded ?: true }
+    }
+
+}

expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableTreeNodeExt.kt

@@ -0,0 +1,14 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import com.github.adriankuta.datastructure.tree.ChildDeclaration
+
+
+@JvmSynthetic
+inline fun <reified T> expandableTree(
+    value: T,
+    childDeclaration: ChildDeclaration<T>
+): ExpandableTreeNode<T> {
+    val treeNode = ExpandableTreeNode(value)
+    treeNode.childDeclaration()
+    return treeNode
+}

expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/MultilevelRecyclerViewAdapter.kt

@@ -3,24 +3,34 @@ package com.github.adriankuta.expandable_recyclerview
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 
-abstract class MultilevelRecyclerViewAdapter<T, VH: RecyclerView.ViewHolder>: RecyclerView.Adapter<VH>() {
+abstract class MultilevelRecyclerViewAdapter<T, VH : RecyclerView.ViewHolder> :
+    RecyclerView.Adapter<VH>() {
 
-    abstract fun getExpandableGroups(): ExpandableGroup<T>
+    private lateinit var treeNodes: ExpandableTreeNode<T>
 
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VH {
-        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+
+    abstract override fun onCreateViewHolder(parent: ViewGroup, nestLevel: Int): VH
+
+    final override fun onBindViewHolder(holder: VH, position: Int) {
+        onBindViewHolder(holder, treeNodes.getVisibleNode(position))
     }
 
-    override fun getItemCount(): Int {
-        getExpandableGroups().toList()
-        return getExpandableGroups().nodeCount()
+    abstract fun onBindViewHolder(holder: VH, treeNode: ExpandableTreeNode<T>)
+
+    abstract fun getTreeNodes(): ExpandableTreeNode<T>
+
+    final override fun getItemCount(): Int {
+        treeNodes = getTreeNodes()
+        return treeNodes.getVisibleNodeCount()
     }
 
-    override fun onBindViewHolder(holder: VH, position: Int) {
-        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    final override fun getItemViewType(position: Int): Int {
+
+        return treeNodes.getVisibleNode(position).depth()
     }
 
-    override fun getItemViewType(position: Int): Int {
-        return super.getItemViewType(position)
+    fun toggleGroup(expandableTreeNode: ExpandableTreeNode<T>) {
+        expandableTreeNode.expanded = !expandableTreeNode.expanded
+        notifyDataSetChanged()
     }
 }

expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/Temp.java

@@ -1,9 +0,0 @@
-package com.github.adriankuta.expandable_recyclerview;
-
-public class Temp {
-
-    public static void main(String[] args) {
-        ExpandableGroup<String> group = new ExpandableGroup<>("");
-
-    }
-}