From fa30b863da8b6f82d20d707313b5471dfff52be1 Mon Sep 17 00:00:00 2001
From: Olaf Wintermann <olaf.wintermann@gmail.com>
Date: Sat, 30 Aug 2025 10:22:23 +0200
Subject: [PATCH] add methods for changing a UiList selection

---
 .../main/java/de/unixwork/ui/ListFuncs.java   |  7 +++++++
 .../src/main/java/de/unixwork/ui/UiList.java  | 19 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/ui-java/src/main/java/de/unixwork/ui/ListFuncs.java b/ui-java/src/main/java/de/unixwork/ui/ListFuncs.java
index e91eb73..ca9cb08 100644
--- a/ui-java/src/main/java/de/unixwork/ui/ListFuncs.java
+++ b/ui-java/src/main/java/de/unixwork/ui/ListFuncs.java
@@ -22,6 +22,8 @@ public class ListFuncs {
     public MethodHandle list_get_selection_allocated;
     public MethodHandle list_selection_get_count;
     public MethodHandle list_selection_get_rows;
+    public MethodHandle list_set_selected_indices;
+    public MethodHandle list_setselection;
     public MethodHandle list_selection_free;
 
     public MethodHandle srclist_new;
@@ -42,6 +44,7 @@ public class ListFuncs {
         FunctionDescriptor sigm_m = FunctionDescriptor.of(ValueLayout.ADDRESS, ValueLayout.ADDRESS);
         FunctionDescriptor sigv_mm = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS, ValueLayout.ADDRESS);
         FunctionDescriptor sigv_mim = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS, ValueLayout.JAVA_INT, ValueLayout.ADDRESS);
+        FunctionDescriptor sigv_mmi = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS, ValueLayout.ADDRESS, ValueLayout.JAVA_INT);
         FunctionDescriptor sigv_mi = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS, ValueLayout.JAVA_INT);
         FunctionDescriptor sigv_m = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS);
         FunctionDescriptor sigi_m = FunctionDescriptor.of(ValueLayout.JAVA_INT, ValueLayout.ADDRESS);
@@ -62,6 +65,8 @@ public class ListFuncs {
         MemorySegment ui_list_get_selection_allocated_addr = lib.find("ui_list_get_selection_allocated").orElseThrow();
         MemorySegment ui_list_selection_get_count_addr = lib.find("ui_list_selection_get_count").orElseThrow();
         MemorySegment ui_list_selection_get_rows_addr = lib.find("ui_list_selection_get_rows").orElseThrow();
+        MemorySegment ui_list_set_selected_indices_addr = lib.find("ui_list_set_selected_indices").orElseThrow();
+        MemorySegment ui_list_setselection_addr = lib.find("ui_list_setselection").orElseThrow();
         MemorySegment ui_list_selection_free_addr = lib.find("ui_list_selection_free").orElseThrow();
 
         MemorySegment ui_srclist_new_addr = lib.find("ui_srclist_new").orElseThrow();
@@ -92,6 +97,8 @@ public class ListFuncs {
         list_get_selection_allocated = linker.downcallHandle(ui_list_get_selection_allocated_addr, sigm_m);
         list_selection_get_count = linker.downcallHandle(ui_list_selection_get_count_addr, sigi_m);
         list_selection_get_rows = linker.downcallHandle(ui_list_selection_get_rows_addr, sigm_m);
+        list_set_selected_indices = linker.downcallHandle(ui_list_set_selected_indices_addr, sigv_mmi);
+        list_setselection = linker.downcallHandle(ui_list_setselection_addr, sigv_mi);
         list_selection_free = linker.downcallHandle(ui_list_selection_free_addr, sigv_m);
 
         srclist_new = linker.downcallHandle(ui_srclist_new_addr, sigm_mm);
diff --git a/ui-java/src/main/java/de/unixwork/ui/UiList.java b/ui-java/src/main/java/de/unixwork/ui/UiList.java
index 104d7f0..223c0ee 100644
--- a/ui-java/src/main/java/de/unixwork/ui/UiList.java
+++ b/ui-java/src/main/java/de/unixwork/ui/UiList.java
@@ -101,6 +101,25 @@ public class UiList<T> extends ArrayList<T> {
         return selection[0];
     }
 
+    public void setSelectedIndex(int index) {
+        ListFuncs ui = ListFuncs.getInstance();
+        try {
+            ui.list_setselection.invoke(valuePtr, index);
+        } catch (Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void setSelection(int[] selection) {
+        ListFuncs ui = ListFuncs.getInstance();
+        try (Arena arena = Arena.ofConfined()) {
+            MemorySegment rows = arena.allocateFrom(ValueLayout.JAVA_INT, selection);
+            ui.list_set_selected_indices.invoke(valuePtr, rows, selection.length);
+        } catch (Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+
     public T getSelected() {
         int index = getSelectedIndex();
         if(index == -1) {
-- 
2.47.3