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-rw-r--r--src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractSingleSelectionList.kt105
-rw-r--r--src/android/app/src/main/java/org/yuzu/yuzu_emu/model/SelectableItem.kt9
2 files changed, 114 insertions, 0 deletions
diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractSingleSelectionList.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractSingleSelectionList.kt
new file mode 100644
index 000000000..52163f9d7
--- /dev/null
+++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractSingleSelectionList.kt
@@ -0,0 +1,105 @@
+// SPDX-FileCopyrightText: 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.yuzu.yuzu_emu.adapters
+
+import org.yuzu.yuzu_emu.model.SelectableItem
+import org.yuzu.yuzu_emu.viewholder.AbstractViewHolder
+
+/**
+ * Generic list class meant to take care of single selection UI updates
+ * @param currentList The list to show initially
+ * @param defaultSelection The default selection to use if no list items are selected by
+ * [SelectableItem.selected] or if the currently selected item is removed from the list
+ */
+abstract class AbstractSingleSelectionList<
+ Model : SelectableItem,
+ Holder : AbstractViewHolder<Model>
+ >(
+ final override var currentList: List<Model>,
+ private val defaultSelection: DefaultSelection = DefaultSelection.Start
+) : AbstractListAdapter<Model, Holder>(currentList) {
+ var selectedItem = getDefaultSelection()
+
+ init {
+ findSelectedItem()
+ }
+
+ /**
+ * Changes the selection state of the [SelectableItem] that was selected and the previously selected
+ * item and notifies the underlying adapter of the change for those items. Invokes [callback] last.
+ * Does nothing if [position] is the same as the currently selected item.
+ * @param position Index of the item that was selected
+ * @param callback Lambda that's called at the end of the list changes and has the selected list
+ * position passed in as a parameter
+ */
+ fun selectItem(position: Int, callback: ((position: Int) -> Unit)? = null) {
+ if (position == selectedItem) {
+ return
+ }
+
+ val previouslySelectedItem = selectedItem
+ selectedItem = position
+ if (currentList.indices.contains(selectedItem)) {
+ currentList[selectedItem].onSelectionStateChanged(true)
+ }
+ if (currentList.indices.contains(previouslySelectedItem)) {
+ currentList[previouslySelectedItem].onSelectionStateChanged(false)
+ }
+ onItemChanged(previouslySelectedItem)
+ onItemChanged(selectedItem)
+ callback?.invoke(position)
+ }
+
+ /**
+ * Removes a given item from the list and notifies the underlying adapter of the change. If the
+ * currently selected item was the item that was removed, the item at the position provided
+ * by [defaultSelection] will be made the new selection. Invokes [callback] last.
+ * @param position Index of the item that was removed
+ * @param callback Lambda that's called at the end of the list changes and has the removed and
+ * selected list positions passed in as parameters
+ */
+ fun removeSelectableItem(
+ position: Int,
+ callback: ((removedPosition: Int, selectedPosition: Int) -> Unit)?
+ ) {
+ removeItem(position)
+ if (position == selectedItem) {
+ selectedItem = getDefaultSelection()
+ currentList[selectedItem].onSelectionStateChanged(true)
+ onItemChanged(selectedItem)
+ } else if (position < selectedItem) {
+ selectedItem--
+ }
+ callback?.invoke(position, selectedItem)
+ }
+
+ override fun addItem(item: Model, position: Int, callback: ((Int) -> Unit)?) {
+ super.addItem(item, position, callback)
+ if (position <= selectedItem && position != -1) {
+ selectedItem++
+ }
+ }
+
+ override fun replaceList(newList: List<Model>) {
+ super.replaceList(newList)
+ findSelectedItem()
+ }
+
+ private fun findSelectedItem() {
+ for (i in currentList.indices) {
+ if (currentList[i].selected) {
+ selectedItem = i
+ break
+ }
+ }
+ }
+
+ private fun getDefaultSelection(): Int =
+ when (defaultSelection) {
+ DefaultSelection.Start -> currentList.indices.first
+ DefaultSelection.End -> currentList.indices.last
+ }
+
+ enum class DefaultSelection { Start, End }
+}
diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/model/SelectableItem.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/model/SelectableItem.kt
new file mode 100644
index 000000000..11c22d323
--- /dev/null
+++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/model/SelectableItem.kt
@@ -0,0 +1,9 @@
+// SPDX-FileCopyrightText: 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.yuzu.yuzu_emu.model
+
+interface SelectableItem {
+ var selected: Boolean
+ fun onSelectionStateChanged(selected: Boolean)
+}