Add methods to change the selected tab in the Shuffleboard app (#1448)

wpilibc/src/main/native/include/frc/shuffleboard/Shuffleboard.h

@@ -82,6 +82,22 @@ class Shuffleboard final {
    */
   static ShuffleboardTab& GetTab(wpi::StringRef title);
 
+  /**
+   * Selects the tab in the dashboard with the given index in the range
+   * [0..n-1], where <i>n</i> is the number of tabs in the dashboard at the time
+   * this method is called.
+   *
+   * @param index the index of the tab to select
+   */
+  static void SelectTab(int index);
+
+  /**
+   * Selects the tab in the dashboard with the given title.
+   *
+   * @param title the title of the tab to select
+   */
+  static void SelectTab(wpi::StringRef title);
+
   /**
    * Enables user control of widgets containing actuators: speed controllers,
    * relays, etc. This should only be used when the robot is in test mode.

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardInstance.h

@@ -28,6 +28,10 @@ class ShuffleboardInstance final : public ShuffleboardRoot {
 
   void DisableActuatorWidgets() override;
 
+  void SelectTab(int index) override;
+
+  void SelectTab(wpi::StringRef) override;
+
  private:
   struct Impl;
   std::unique_ptr<Impl> m_impl;

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h

@@ -45,6 +45,22 @@ class ShuffleboardRoot {
    * actuators.
    */
   virtual void DisableActuatorWidgets() = 0;
+
+  /**
+   * Selects the tab in the dashboard with the given index in the range
+   * [0..n-1], where <i>n</i> is the number of tabs in the dashboard at the time
+   * this method is called.
+   *
+   * @param index the index of the tab to select
+   */
+  virtual void SelectTab(int index) = 0;
+
+  /**
+   * Selects the tab in the dashboard with the given title.
+   *
+   * @param title the title of the tab to select
+   */
+  virtual void SelectTab(wpi::StringRef title) = 0;
 };
 
 }  // namespace frc