[glass] Add Alerts widget (#7219)

glass/src/libnt/native/cpp/NTAlerts.cpp

@@ -0,0 +1,51 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "glass/networktables/NTAlerts.h"
+
+#include <utility>
+
+#include <fmt/format.h>
+
+using namespace glass;
+
+NTAlertsModel::NTAlertsModel(std::string_view path)
+    : NTAlertsModel{nt::NetworkTableInstance::GetDefault(), path} {}
+
+NTAlertsModel::NTAlertsModel(nt::NetworkTableInstance inst,
+                             std::string_view path)
+    : m_inst{inst},
+      m_infos{m_inst.GetStringArrayTopic(fmt::format("{}/infos", path))
+                  .Subscribe({})},
+      m_warnings{m_inst.GetStringArrayTopic(fmt::format("{}/warnings", path))
+                     .Subscribe({})},
+      m_errors{m_inst.GetStringArrayTopic(fmt::format("{}/errors", path))
+                   .Subscribe({})} {}
+
+void NTAlertsModel::Update() {
+  if (!m_infos.Exists()) {
+    m_infosValue.clear();
+  }
+  for (auto&& v : m_infos.ReadQueue()) {
+    m_infosValue = std::move(v.value);
+  }
+
+  if (!m_warnings.Exists()) {
+    m_warningsValue.clear();
+  }
+  for (auto&& v : m_warnings.ReadQueue()) {
+    m_warningsValue = std::move(v.value);
+  }
+
+  if (!m_errors.Exists()) {
+    m_errorsValue.clear();
+  }
+  for (auto&& v : m_errors.ReadQueue()) {
+    m_errorsValue = std::move(v.value);
+  }
+}
+
+bool NTAlertsModel::Exists() {
+  return m_infos.Exists();
+}

glass/src/libnt/native/cpp/StandardNetworkTables.cpp

@@ -4,6 +4,7 @@
 
 #include <memory>
 
+#include "glass/networktables/NTAlerts.h"
 #include "glass/networktables/NTCommandScheduler.h"
 #include "glass/networktables/NTCommandSelector.h"
 #include "glass/networktables/NTDifferentialDrive.h"
@@ -24,6 +25,16 @@
 using namespace glass;
 
 void glass::AddStandardNetworkTablesViews(NetworkTablesProvider& provider) {
+  provider.Register(
+      NTAlertsModel::kType,
+      [](nt::NetworkTableInstance inst, const char* path) {
+        return std::make_unique<NTAlertsModel>(inst, path);
+      },
+      [](Window* win, Model* model, const char*) {
+        win->SetDefaultSize(300, 150);
+        return MakeFunctionView(
+            [=] { DisplayAlerts(static_cast<NTAlertsModel*>(model)); });
+      });
   provider.Register(
       NTCommandSchedulerModel::kType,
       [](nt::NetworkTableInstance inst, const char* path) {