Let use expression directly with RNTuple

Author: linev

modules/draw.mjs

@@ -135,7 +135,7 @@ drawFuncs = { lst: [
    { name: clTBranchFunc, icon: 'img_leaf_method', draw: () => import_tree().then(h => h.drawTree), opt: ';dump', noinspect: true },
    { name: /^TBranch/, icon: 'img_branch', draw: () => import_tree().then(h => h.drawTree), dflt: 'expand', opt: ';dump', ctrl: 'dump', shift: kInspect, ignore_online: true, always_draw: true },
    { name: /^TLeaf/, icon: 'img_leaf', noexpand: true, draw: () => import_tree().then(h => h.drawTree), opt: ';dump', ctrl: 'dump', ignore_online: true, always_draw: true },
-   { name: 'ROOT::RNTuple', icon: 'img_tree', get_expand: () => import('./rntuple.mjs').then(h => h.tupleHierarchy) },
+   { name: 'ROOT::RNTuple', icon: 'img_tree', get_expand: () => import('./rntuple.mjs').then(h => h.tupleHierarchy), draw: () => import('./draw/RNTuple.mjs').then(h => h.drawRNTuple) },
    { name: 'ROOT::RNTupleField', icon: 'img_leaf', draw: () => import('./draw/RNTuple.mjs').then(h => h.drawRNTuple), opt: ';dump', ctrl: 'dump', shift: kInspect, ignore_online: true, always_draw: true },
    { name: clTList, icon: 'img_list', draw: () => import_h().then(h => h.drawList), get_expand: () => import_h().then(h => h.listHierarchy), dflt: 'expand' },
    { name: clTHashList, sameas: clTList },

modules/draw/RNTuple.mjs

@@ -17,6 +17,9 @@ async function drawRNTuple(dom, obj, opt) {
          args.expr += '>>' + opt;
       else if (opt)
          args.expr += opt;
+   } else {
+      tuple = obj;
+      args.expr = opt;
    }
 
    if (!tuple)

modules/tree.mjs

@@ -982,7 +982,9 @@ class TDrawSelector extends TSelector {
       let expr = this.parseParameters(tree, args, args.expr), cut = '';
 
       // parse option for histogram creation
-      this.draw_title = `drawing '${expr}' from ${tree.fName}`;
+      this.draw_title = `drawing '${expr}'`;
+      if (tree?.fName)
+         this.draw_title += `from ${tree.fName}`;
 
       let pos;
       if (args.cut)
@@ -1062,7 +1064,7 @@ class TDrawSelector extends TSelector {
       this.vars[0] = new TDrawVariable(this.globals);
       if (!this.vars[0].parse(tree, this, expr, branch, args.direct_branch))
          return false;
-      this.draw_title = `drawing branch ${branch.fName} ${expr?' expr:'+expr:''} from ${tree.fName}`;
+      this.draw_title = `drawing branch ${branch.fName} ${expr?' expr:'+expr:''} from ${tree.fName ?? ''}`;
 
       this.cut = new TDrawVariable(this.globals);