Added comment element.

NuiCpp · Oct 1, 2023 · 70257b8 · 70257b8
1 parent d751320
commit 70257b8
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diff --git a/nui/include/nui/frontend/elements.hpp b/nui/include/nui/frontend/elements.hpp
@@ -17,6 +17,7 @@
 #include <nui/frontend/elements/caption.hpp>
 #include <nui/frontend/elements/cite.hpp>
 #include <nui/frontend/elements/code.hpp>
+#include <nui/frontend/elements/comment.hpp>
 #include <nui/frontend/elements/data.hpp>
 #include <nui/frontend/elements/datalist.hpp>
 #include <nui/frontend/elements/dd.hpp>

diff --git a/nui/include/nui/frontend/elements/comment.hpp b/nui/include/nui/frontend/elements/comment.hpp
@@ -0,0 +1,48 @@
+#pragma once
+
+#include <nui/frontend/elements/impl/html_element_incl.hpp>
+#include <nui/frontend/event_system/observed_value.hpp>
+#include <nui/frontend/event_system/event_context.hpp>
+
+#include <string_view>
+
+namespace Nui::Elements
+{
+    struct comment : HtmlElement
+    {
+        comment(comment const&) = default;
+        comment(comment&&) = default;
+        comment(std::string_view content)
+            : HtmlElement{"", &CommentElementBridge, Attribute{content, {}, {}}}
+        {}
+        comment(Nui::Observed<std::string>& obs)
+            : HtmlElement{
+                  "",
+                  &CommentElementBridge,
+                  Attribute{
+                      obs.value(),
+                      [&obs](std::weak_ptr<Dom::ChildlessElement>&& element) {
+                          const auto eventId = globalEventContext.registerEvent(Event{
+                              [element, &obs](auto eventId) {
+                                  if (auto shared = element.lock(); shared)
+                                  {
+                                      shared->setNodeValue(obs.value());
+                                      return true;
+                                  }
+                                  obs.unattachEvent(eventId);
+                                  return false;
+                              },
+                              [element]() {
+                                  return !element.expired();
+                              }});
+                          obs.attachEvent(eventId);
+                          return eventId;
+                      },
+                      [&obs](EventContext::EventIdType const& id) {
+                          obs.unattachEvent(id);
+                      },
+                  },
+              }
+        {}
+    };
+}
diff --git a/nui/include/nui/frontend/elements/impl/html_element_bridges.hpp b/nui/include/nui/frontend/elements/impl/html_element_bridges.hpp
@@ -30,4 +30,12 @@ namespace Nui
                     .call<Nui::val>("createTextNode", Nui::val{element.attributes()[0].stringData()});
             },
     };
+
+    constexpr auto CommentElementBridge = HtmlElementBridge{
+        .createElement =
+            +[](HtmlElement const& element) {
+                return Nui::val::global("document")
+                    .call<Nui::val>("createComment", Nui::val{element.attributes()[0].stringData()});
+            },
+    };
 }