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

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

@@ -0,0 +1,76 @@
+/*----------------------------------------------------------------------------*/
+/* 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/ShuffleboardComponentBase.h"
+
+#include <wpi/SmallVector.h>
+
+using namespace frc;
+
+ShuffleboardComponentBase::ShuffleboardComponentBase(
+    ShuffleboardContainer& parent, const wpi::Twine& title,
+    const wpi::Twine& type)
+    : ShuffleboardValue(title), m_parent(parent) {
+  wpi::SmallVector<char, 16> storage;
+  m_type = type.toStringRef(storage);
+}
+
+void ShuffleboardComponentBase::SetType(const wpi::Twine& type) {
+  wpi::SmallVector<char, 16> storage;
+  m_type = type.toStringRef(storage);
+  m_metadataDirty = true;
+}
+
+void ShuffleboardComponentBase::BuildMetadata(
+    std::shared_ptr<nt::NetworkTable> metaTable) {
+  if (!m_metadataDirty) {
+    return;
+  }
+  // Component type
+  if (GetType() == "") {
+    metaTable->GetEntry("PreferredComponent").Delete();
+  } else {
+    metaTable->GetEntry("PreferredComponent").ForceSetString(GetType());
+  }
+
+  // Tile size
+  if (m_width <= 0 || m_height <= 0) {
+    metaTable->GetEntry("Size").Delete();
+  } else {
+    metaTable->GetEntry("Size").SetDoubleArray(
+        {static_cast<double>(m_width), static_cast<double>(m_height)});
+  }
+
+  // Tile position
+  if (m_column < 0 || m_row < 0) {
+    metaTable->GetEntry("Position").Delete();
+  } else {
+    metaTable->GetEntry("Position")
+        .SetDoubleArray(
+            {static_cast<double>(m_column), static_cast<double>(m_row)});
+  }
+
+  // Custom properties
+  if (GetProperties().size() > 0) {
+    auto propTable = metaTable->GetSubTable("Properties");
+    for (auto& entry : GetProperties()) {
+      propTable->GetEntry(entry.first()).SetValue(entry.second);
+    }
+  }
+  m_metadataDirty = false;
+}
+
+ShuffleboardContainer& ShuffleboardComponentBase::GetParent() {
+  return m_parent;
+}
+
+const std::string& ShuffleboardComponentBase::GetType() const { return m_type; }
+
+const wpi::StringMap<std::shared_ptr<nt::Value>>&
+ShuffleboardComponentBase::GetProperties() const {
+  return m_properties;
+}