add nf7::File::RequestFocus()

common/gui.cc

@@ -22,7 +22,7 @@ void FileMenuItems(nf7::File& f) noexcept {
   auto config = f.interface<nf7::Config>();
 
   if (ImGui::MenuItem("request focus")) {
-    f.env().Handle({.id = f.id(), .type = nf7::File::Event::kReqFocus});
+    f.RequestFocus();
   }
   if (ImGui::MenuItem("copy path")) {
     ImGui::SetClipboardText(f.abspath().Stringify().c_str());

file/system_dir.cc

@@ -149,7 +149,7 @@ void Dir::UpdateTree() noexcept {
 
     // send nf7::File::Event::kReqFocus on double click
     if (ImGui::IsItemHovered() && ImGui::IsMouseDoubleClicked(ImGuiMouseButton_Left)) {
-      env().Handle({.id = file.id(), .type = nf7::File::Event::kReqFocus});
+      file.RequestFocus();
     }
 
     // context menu

nf7.cc

@@ -114,6 +114,9 @@ void File::Touch() noexcept {
         }
       });
 }
+void File::RequestFocus() noexcept {
+  env().Handle({ .id = id_, .type = nf7::File::Event::kReqFocus });
+}
 File& File::FindOrThrow(std::string_view name) const {
   if (auto ret = Find(name)) return *ret;
   throw NotFoundException("missing child: "+std::string(name));

nf7.hh

@@ -95,6 +95,7 @@ class File {
   void Isolate() noexcept;
 
   void Touch() noexcept;
+  void RequestFocus() noexcept;
 
   virtual void Update() noexcept { }
   virtual void Handle(const Event&) noexcept { }
@@ -137,14 +138,9 @@ class File {
 struct File::Event final {
  public:
   enum Type {
-    // emitted by system (do not emit manually)
     kAdd,
     kRemove,
-
-    // can be emitted from inside of File
     kUpdate,
-
-    // can be emitted from outside of File
     kReqFocus,
   };
   Id   id;