Add persistent alerts widget

plugins/base/src/main/java/edu/wpi/first/shuffleboard/plugin/base/BasePlugin.java

@@ -17,6 +17,7 @@
 import edu.wpi.first.shuffleboard.api.widget.LayoutClass;
 import edu.wpi.first.shuffleboard.api.widget.WidgetType;
 import edu.wpi.first.shuffleboard.plugin.base.data.types.AccelerometerType;
+import edu.wpi.first.shuffleboard.plugin.base.data.types.AlertsType;
 import edu.wpi.first.shuffleboard.plugin.base.data.types.AnalogInputType;
 import edu.wpi.first.shuffleboard.plugin.base.data.types.BasicSubsystemType;
 import edu.wpi.first.shuffleboard.plugin.base.data.types.CommandType;
@@ -43,6 +44,7 @@
 import edu.wpi.first.shuffleboard.plugin.base.layout.ListLayout;
 import edu.wpi.first.shuffleboard.plugin.base.layout.SubsystemLayout;
 import edu.wpi.first.shuffleboard.plugin.base.widget.AccelerometerWidget;
+import edu.wpi.first.shuffleboard.plugin.base.widget.AlertsWidget;
 import edu.wpi.first.shuffleboard.plugin.base.widget.BasicFmsInfoWidget;
 import edu.wpi.first.shuffleboard.plugin.base.widget.BasicSubsystemWidget;
 import edu.wpi.first.shuffleboard.plugin.base.widget.BooleanBoxWidget;
@@ -81,7 +83,7 @@
 @Description(
     group = "edu.wpi.first.shuffleboard",
     name = "Base",
-    version = "1.3.6",
+    version = "1.3.7",
     summary = "Defines all the WPILib data types and stock widgets"
 )
 @SuppressWarnings("PMD.CouplingBetweenObjects")
@@ -129,7 +131,8 @@ public List<DataType> getDataTypes() {
         DifferentialDriveType.Instance,
         FmsInfoType.Instance,
         UltrasonicType.Instance,
-        FieldType.Instance
+        FieldType.Instance,
+        AlertsType.Instance
     );
   }
 
@@ -165,6 +168,7 @@ public List<ComponentType> getComponents() {
         WidgetType.forAnnotatedWidget(BasicFmsInfoWidget.class),
         WidgetType.forAnnotatedWidget(UltrasonicWidget.class),
         WidgetType.forAnnotatedWidget(FieldWidget.class),
+        WidgetType.forAnnotatedWidget(AlertsWidget.class),
         new LayoutClass<>("List Layout", ListLayout.class),
         new LayoutClass<>("Grid Layout", GridLayout.class),
         createSubsystemLayoutType()
@@ -198,6 +202,7 @@ public Map<DataType, ComponentType> getDefaultComponents() {
         .put(UltrasonicType.Instance, WidgetType.forAnnotatedWidget(UltrasonicWidget.class))
         .put(BasicSubsystemType.Instance, WidgetType.forAnnotatedWidget(BasicSubsystemWidget.class))
         .put(FieldType.Instance, WidgetType.forAnnotatedWidget(FieldWidget.class))
+        .put(AlertsType.Instance, WidgetType.forAnnotatedWidget(AlertsWidget.class))
         .put(SubsystemType.Instance, createSubsystemLayoutType())
         .build();
   }

plugins/base/src/main/java/edu/wpi/first/shuffleboard/plugin/base/data/AlertsData.java

@@ -0,0 +1,90 @@
+package edu.wpi.first.shuffleboard.plugin.base.data;
+
+import edu.wpi.first.shuffleboard.api.data.ComplexData;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+
+import java.util.Map;
+
+public final class AlertsData extends ComplexData<AlertsData> {
+
+  private final String[] errors;
+  private final String[] warnings;
+  private final String[] infos;
+
+  /**
+   * Creates a new AlertsData object.
+   *
+   * @param errors   List of active error alerts
+   * @param warnings List of active warning alerts
+   * @param infos    List of active info alerts
+   */
+  public AlertsData(String[] errors, String[] warnings, String[] infos) {
+    this.errors = errors;
+    this.warnings = warnings;
+    this.infos = infos;
+  }
+
+  /**
+   * Gets the list of error alerts.
+   */
+  public String[] getErrors() {
+    return errors;
+  }
+
+  /**
+   * Gets the list of warning alerts.
+   */
+  public String[] getWarnings() {
+    return warnings;
+  }
+
+  /**
+   * Gets the list of info alerts.
+   */
+  public String[] getInfos() {
+    return infos;
+  }
+
+  /**
+   * Gets a collection of all alerts.
+   */
+  public ObservableList<AlertItem> getCollection() {
+    ObservableList<AlertItem> collection = FXCollections.observableArrayList();
+    for (String text : errors) {
+      collection.add(new AlertItem(AlertType.ERROR, text));
+    }
+    for (String text : warnings) {
+      collection.add(new AlertItem(AlertType.WARNING, text));
+    }
+    for (String text : infos) {
+      collection.add(new AlertItem(AlertType.INFO, text));
+    }
+    return collection;
+  }
+
+  @Override
+  public String toHumanReadableString() {
+    return Integer.toString(errors.length) + " error(s), " + Integer.toString(warnings.length) + " warning(s), "
+        + Integer.toString(infos.length) + " info(s)";
+  }
+
+  @Override
+  public Map<String, Object> asMap() {
+    return Map.of("errors", errors, "warnings", warnings, "infos", infos);
+  }
+
+  public static class AlertItem {
+    public final AlertType type;
+    public final String text;
+
+    public AlertItem(AlertType type, String text) {
+      this.type = type;
+      this.text = text;
+    }
+  }
+
+  public static enum AlertType {
+    ERROR, WARNING, INFO
+  }
+}

plugins/base/src/main/java/edu/wpi/first/shuffleboard/plugin/base/data/types/AlertsType.java

@@ -0,0 +1,44 @@
+package edu.wpi.first.shuffleboard.plugin.base.data.types;
+
+import edu.wpi.first.shuffleboard.api.data.ComplexDataType;
+import edu.wpi.first.shuffleboard.api.util.Maps;
+import edu.wpi.first.shuffleboard.plugin.base.data.AlertsData;
+
+import java.util.Map;
+import java.util.function.Function;
+
+public final class AlertsType extends ComplexDataType<AlertsData> {
+
+  /**
+   * The name of data of this type as it would appear in a WPILib sendable's
+   * {@code .type} entry; a differential drive base a {@code .type} of
+   * "DifferentialDrive", a sendable chooser has it set to "String Chooser"; a
+   * hypothetical 2D point would have it set to "Point2D".
+   */
+  private static final String TYPE_NAME = "Alerts";
+
+  /**
+   * The single instance of the point type. By convention, this is a
+   * {@code public static final} field and the constructor is private to ensure
+   * only a single instance of the data type exists.
+   */
+  public static final AlertsType Instance = new AlertsType();
+
+  private AlertsType() {
+    super(TYPE_NAME, AlertsData.class);
+  }
+
+  @Override
+  public Function<Map<String, Object>, AlertsData> fromMap() {
+    return map -> new AlertsData(
+      Maps.getOrDefault(map, "errors", new String[0]),
+      Maps.getOrDefault(map, "warnings", new String[0]),
+      Maps.getOrDefault(map, "infos", new String[0])
+    );
+  }
+
+  @Override
+  public AlertsData getDefaultValue() {
+    return new AlertsData(new String[] {}, new String[] {}, new String[] {});
+  }
+}

plugins/base/src/main/java/edu/wpi/first/shuffleboard/plugin/base/widget/AlertsWidget.java

@@ -0,0 +1,155 @@
+package edu.wpi.first.shuffleboard.plugin.base.widget;
+
+import edu.wpi.first.shuffleboard.api.widget.Description;
+import edu.wpi.first.shuffleboard.api.widget.ParametrizedController;
+import edu.wpi.first.shuffleboard.api.widget.SimpleAnnotatedWidget;
+import edu.wpi.first.shuffleboard.plugin.base.data.AlertsData;
+import edu.wpi.first.shuffleboard.plugin.base.data.AlertsData.AlertItem;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import javafx.fxml.FXML;
+import javafx.geometry.Pos;
+import javafx.scene.control.ListCell;
+import javafx.scene.control.ListView;
+import javafx.scene.control.MultipleSelectionModel;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.GridPane;
+import javafx.scene.layout.Pane;
+import javafx.scene.text.TextAlignment;
+
+@Description(name = "Alerts", dataTypes = AlertsData.class, summary = "Displays a list of alerts.")
+@ParametrizedController("AlertsWidget.fxml")
+public final class AlertsWidget extends SimpleAnnotatedWidget<AlertsData> {
+
+  private Image errorIcon = new Image(getClass().getResourceAsStream("icons/error.png"));
+  private Image warningIcon = new Image(getClass().getResourceAsStream("icons/warning.png"));
+  private Image infoIcon = new Image(getClass().getResourceAsStream("icons/info.png"));
+
+  @FXML
+  private Pane root;
+
+  @FXML
+  private ListView<AlertItem> list;
+
+  @FXML
+  private GridPane placeholder;
+
+  @FXML
+  private void initialize() {
+    list.setCellFactory(param -> new ListCell<AlertItem>() {
+      @Override
+      protected void updateItem(AlertItem item, boolean empty) {
+        super.updateItem(item, empty);
+        if (empty || item == null) {
+          setGraphic(null);
+          setText(null);
+        } else {
+          setMinWidth(param.getWidth() - 32);
+          setMaxWidth(param.getWidth() - 32);
+          setPrefWidth(param.getWidth() - 32);
+
+          setWrapText(true);
+          setText(item.text);
+          setTextAlignment(TextAlignment.LEFT);
+
+          ImageView imageView = new ImageView();
+          switch (item.type) {
+            case ERROR:
+              imageView.setImage(errorIcon);
+              break;
+            case WARNING:
+              imageView.setImage(warningIcon);
+              break;
+            case INFO:
+              imageView.setImage(infoIcon);
+              break;
+            default:
+              break;
+          }
+          imageView.setFitHeight(20);
+          imageView.setFitWidth(20);
+          imageView.setTranslateX(-3);
+          imageView.setSmooth(true);
+          setGraphic(imageView);
+        }
+      }
+    });
+
+    list.setSelectionModel(new NoSelectionModel<AlertItem>());
+    list.itemsProperty().bind(dataOrDefault.map(AlertsData::getCollection));
+    placeholder.setAlignment(Pos.TOP_CENTER);
+  }
+
+  @Override
+  public Pane getView() {
+    return root;
+  }
+
+  private static class NoSelectionModel<T> extends MultipleSelectionModel<T> {
+
+    @Override
+    public ObservableList<Integer> getSelectedIndices() {
+      return FXCollections.emptyObservableList();
+    }
+
+    @Override
+    public ObservableList<T> getSelectedItems() {
+      return FXCollections.emptyObservableList();
+    }
+
+    @Override
+    public void selectIndices(int index, int... indices) {
+    }
+
+    @Override
+    public void selectAll() {
+    }
+
+    @Override
+    public void selectFirst() {
+    }
+
+    @Override
+    public void selectLast() {
+    }
+
+    @Override
+    public void clearAndSelect(int index) {
+    }
+
+    @Override
+    public void select(int index) {
+    }
+
+    @Override
+    public void select(T obj) {
+    }
+
+    @Override
+    public void clearSelection(int index) {
+    }
+
+    @Override
+    public void clearSelection() {
+    }
+
+    @Override
+    public boolean isSelected(int index) {
+      return false;
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return true;
+    }
+
+    @Override
+    public void selectPrevious() {
+    }
+
+    @Override
+    public void selectNext() {
+    }
+  }
+}

plugins/base/src/main/resources/edu/wpi/first/shuffleboard/plugin/base/widget/AlertsWidget.fxml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.ListView?>
+<?import javafx.scene.image.ImageView?>
+<?import javafx.scene.image.Image?>
+<?import javafx.scene.layout.*?>
+<VBox xmlns="http://javafx.com/javafx"
+      xmlns:fx="http://javafx.com/fxml"
+      fx:controller="edu.wpi.first.shuffleboard.plugin.base.widget.AlertsWidget"
+      fx:id="root"
+      stylesheets="@alerts-widget.css">
+      <ListView fx:id="list">
+            <placeholder>
+                  <GridPane fx:id="placeholder">
+                        <Label text="(Nothing to report)"/>
+                  </GridPane>
+            </placeholder>
+      </ListView>
+</VBox>

plugins/base/src/main/resources/edu/wpi/first/shuffleboard/plugin/base/widget/alerts-widget.css

@@ -0,0 +1,3 @@
+.list-view .list-cell {
+    -fx-background-color: transparent;
+}