Add fluent builders for more flexibly adding data to Shuffleboard (#1022)

wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardTab.cpp

@@ -0,0 +1,25 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "frc/shuffleboard/ShuffleboardTab.h"
+
+using namespace frc;
+
+ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, wpi::StringRef title)
+    : ShuffleboardValue(title), ShuffleboardContainer(title), m_root(root) {}
+
+ShuffleboardRoot& ShuffleboardTab::GetRoot() { return m_root; }
+
+void ShuffleboardTab::BuildInto(std::shared_ptr<nt::NetworkTable> parentTable,
+                                std::shared_ptr<nt::NetworkTable> metaTable) {
+  auto tabTable = parentTable->GetSubTable(GetTitle());
+  tabTable->GetEntry(".type").SetString("ShuffleboardTab");
+  for (auto& component : GetComponents()) {
+    component->BuildInto(tabTable,
+                         metaTable->GetSubTable(component->GetTitle()));
+  }
+}