Perspectives

import org.apache.hop.core.gui.plugin.GuiPlugin;
import org.apache.hop.ui.hopgui.HopGui;
import org.apache.hop.ui.hopgui.file.IHopFileType;
import org.apache.hop.ui.hopgui.perspective.HopPerspectivePlugin;
import org.apache.hop.ui.hopgui.perspective.IHopPerspective;
import java.util.Collections;
import java.util.List;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

@HopPerspectivePlugin(
    id = "300-CustomPerspective",             // Numeric prefix dictates sidebar icon order
    name = "Custom Workbench",
    description = "Custom analytics workbench",
    image = "custom-perspective.svg"
)
@GuiPlugin
public class CustomPerspective implements IHopPerspective {

  private static CustomPerspective instance;
  private Composite composite;
  private boolean initialized;

  public CustomPerspective() {
    instance = this;
  }

  public static CustomPerspective getInstance() {
    return instance;
  }

  @Override
  public String getId() {
    return "300-CustomPerspective";
  }

  @Override
  public void initialize(HopGui hopGui, Composite parent) {
    this.composite = new Composite(parent, SWT.NONE);
    this.composite.setLayout(new FillLayout());

    // Build workbench UI controls inside this.composite...

    this.initialized = true;
  }

  @Override
  public void activate() {
    // Called when the user clicks this perspective's icon in the sidebar
  }

  @Override
  public void perspectiveActivated() {
    // Post-activation logic
  }

  @Override
  public boolean isActive() {
    return HopGui.getInstance().isActivePerspective(this);
  }

  @Override
  public Control getControl() {
    return composite;
  }

  @Override
  public List<IHopFileType> getSupportedHopFileTypes() {
    return Collections.emptyList();
  }

  public boolean isInitialized() {
    return initialized;
  }
}