Add persistent shared editor tree interactions

editor/src/panels/ProjectPanel.cpp

@@ -14,6 +14,26 @@
 namespace XCEngine {
 namespace Editor {
 
+namespace {
+
+void DrawProjectFolderTreePrefix(const UI::TreeNodePrefixContext& context) {
+    if (!context.drawList) {
+        return;
+    }
+
+    const float iconWidth = 14.0f;
+    const float iconHeight = 11.0f;
+    const float minX = context.min.x + ((context.max.x - context.min.x) - iconWidth) * 0.5f;
+    const float minY = context.min.y + ((context.max.y - context.min.y) - iconHeight) * 0.5f;
+    UI::DrawAssetIcon(
+        context.drawList,
+        ImVec2(minX, minY),
+        ImVec2(minX + iconWidth, minY + iconHeight),
+        UI::AssetIconKind::Folder);
+}
+
+} // namespace
+
 ProjectPanel::ProjectPanel() : Panel("Project") {
 }
 
@@ -118,19 +138,24 @@ void ProjectPanel::RenderFolderTreeNode(
         }
     }
 
-    UI::TreeNodeOptions nodeOptions;
-    nodeOptions.selected = folder->fullPath == currentFolderPath;
-    nodeOptions.leaf = !hasChildFolders;
-    nodeOptions.defaultOpen = IsCurrentTreeBranch(currentFolderPath, folder->fullPath);
+    UI::TreeNodeDefinition nodeDefinition;
+    nodeDefinition.options.selected = folder->fullPath == currentFolderPath;
+    nodeDefinition.options.leaf = !hasChildFolders;
+    nodeDefinition.options.defaultOpen = IsCurrentTreeBranch(currentFolderPath, folder->fullPath);
+    nodeDefinition.persistenceKey = folder->fullPath;
+    nodeDefinition.prefix.width = UI::NavigationTreePrefixWidth();
+    nodeDefinition.prefix.draw = DrawProjectFolderTreePrefix;
+    nodeDefinition.callbacks.onInteraction = [&manager, folder](const UI::TreeNodeResult& node) {
+        if (node.clicked) {
+            manager.NavigateToFolder(folder);
+        }
+    };
 
     const UI::TreeNodeResult node = UI::DrawTreeNode(
+        &m_folderTreeState,
         (void*)folder.get(),
         folder->name.c_str(),
-        nodeOptions);
-
-    if (node.clicked) {
-        manager.NavigateToFolder(folder);
-    }
+        nodeDefinition);
 
     if (node.open) {
         for (const auto& child : folder->children) {