Remove content model and replace with path changed callback

For #8

component/src/desktopMain/kotlin/org/pushingpixels/aurora/component/AuroraBreadcrumbBar.kt

@@ -48,6 +48,7 @@ import org.pushingpixels.aurora.theming.*
 @Composable
 fun <T> AuroraBreadcrumbBar(
     contentProvider: BreadcrumbBarContentProvider<T>,
+    onShownPathChanged: ((List<BreadcrumbItem<T>>) -> Unit)? = null,
     presentationModel: BreadcrumbBarPresentationModel = BreadcrumbBarPresentationModel(),
     modifier: Modifier
 ) {
@@ -60,7 +61,6 @@ fun <T> AuroraBreadcrumbBar(
     // for the root.
     val shownPathChoices: MutableList<List<BreadcrumbItem<T>>> = remember { mutableStateListOf() }
 
-    val contentModel = remember { BreadcrumbBarContentModel(shownPath) }
     if (!initialized.value) {
         LaunchedEffect(null) {
             coroutineScope {
@@ -240,6 +240,8 @@ fun <T> AuroraBreadcrumbBar(
                                 action = {
                                     shownPath.clear()
                                     shownPath.add(rootChoice)
+                                    onShownPathChanged?.invoke(shownPath)
+
                                     scope.launch {
                                         while (shownPathChoices.size > 1) {
                                             shownPathChoices.removeLast()
@@ -261,6 +263,7 @@ fun <T> AuroraBreadcrumbBar(
                 action = {
                     // Clear all entries in the shown path
                     shownPath.clear()
+                    onShownPathChanged?.invoke(shownPath)
                 },
                 secondaryContentModel = rootSecondaryContentModel
             )
@@ -285,6 +288,7 @@ fun <T> AuroraBreadcrumbBar(
                                             shownPath.removeLast()
                                         }
                                         shownPath.add(entryChoice)
+                                        onShownPathChanged?.invoke(shownPath)
 
                                         // And load choices for this entry
                                         scope.launch {
@@ -312,6 +316,7 @@ fun <T> AuroraBreadcrumbBar(
                     while (shownPath.size > indexInShownPathChoices) {
                         shownPath.removeLast()
                     }
+                    onShownPathChanged?.invoke(shownPath)
                 },
                 secondaryContentModel = shownPathEntryMenuContentModel
             )

component/src/desktopMain/kotlin/org/pushingpixels/aurora/component/model/BreadcrumbBarModels.kt

@@ -15,13 +15,10 @@
  */
 package org.pushingpixels.aurora.component.model
 
-import androidx.compose.runtime.mutableStateListOf
-import androidx.compose.runtime.remember
 import androidx.compose.ui.graphics.painter.Painter
 import org.pushingpixels.aurora.theming.BackgroundAppearanceStrategy
 import org.pushingpixels.aurora.theming.IconFilterStrategy
 import java.io.InputStream
-import java.util.*
 
 /**
  * A single item in the breadcrumb bar model.
@@ -66,77 +63,6 @@ interface BreadcrumbBarContentProvider<T> {
     }
 }
 
-/**
- * Model for the breadcrumb bar component.
- */
-class BreadcrumbBarContentModel<T>(val items: MutableList<BreadcrumbItem<T>>) {
-    /**
-     * Returns the index of the specified item.
-     *
-     * @param item Item.
-     * @return Index of the item if it is in the model or -1 if it is not.
-     */
-    fun indexOf(item: BreadcrumbItem<T>): Int {
-        return items.indexOf(item)
-    }
-
-    /**
-     * Removes the last item in this model.
-     */
-    fun removeLast() {
-        items.removeLast()
-    }
-
-    /**
-     * Resets this model, removing all the items.
-     */
-    fun reset() {
-        items.clear()
-    }
-
-    /**
-     * Returns the number of items in this model.
-     *
-     * @return Number of items in this model.
-     */
-    val itemCount: Int = items.size
-
-    /**
-     * Returns the model item at the specified index.
-     *
-     * @param index Item index.
-     * @return The model item at the specified index. Will return
-     * `null` if the index is negative or larger than the
-     * number of items.
-     */
-    fun getItem(index: Int): BreadcrumbItem<T>? {
-        if (index < 0) return null
-        return if (index >= itemCount) null else items[index]
-    }
-
-    /**
-     * Replaces the current item list with the specified list.
-     *
-     * @param items New contents of the model.
-     */
-    fun replace(items: List<BreadcrumbItem<T>>) {
-        this.items.clear()
-        for (i in items.indices) {
-            this.items.add(items[i])
-        }
-    }
-
-    /**
-     * Adds the specified item at the end of the path.
-     *
-     * @param item Item to add.
-     */
-    fun add(item: BreadcrumbItem<T>) {
-        items.add(item)
-    }
-}
-
-
 data class BreadcrumbBarPresentationModel(
     val presentationState: CommandButtonPresentationState = CommandButtonPresentationState.Medium,
     val backgroundAppearanceStrategy: BackgroundAppearanceStrategy = BackgroundAppearanceStrategy.Flat,

demo/src/desktopMain/kotlin/org/pushingpixels/aurora/demo/AuroraBreadcrumbBarDemo.kt

@@ -112,6 +112,9 @@ fun AuroraApplicationScope.BreadcrumbContent(auroraSkinDefinition: MutableState<
         AuroraDecorationArea(decorationAreaType = DecorationAreaType.Header) {
             AuroraBreadcrumbBar(
                 contentProvider = contentProvider,
+                onShownPathChanged = {
+                    println(it.last().data)
+                },
                 presentationModel = BreadcrumbBarPresentationModel(
                     iconActiveFilterStrategy = IconFilterStrategy.ThemedFollowText,
                     iconEnabledFilterStrategy = IconFilterStrategy.ThemedFollowText,