GreetingState.java

package dev.simplified.tabsimile.header;

import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.components.Service;
import dev.simplified.tabsimile.session.SessionManager;
import org.jetbrains.annotations.NotNull;

/**
 * Whether the greeting label is showing in the header.
 *
 * <p>
 * Application-level rather than project-level, which is what makes one toggle apply
 * to every open Tabsimile tool window at once instead of only the window it was
 * flipped in. The state lives in memory and is deliberately not persisted - there is
 * no {@code PersistentStateComponent} here, so it resets when the IDE restarts.
 *
 * <p>
 * Contrast {@link SessionManager}, which is the same idea one scope down: a project
 * service, because session tabs belong to a project rather than to the application.
 */
@Service(Service.Level.APP)
public final class GreetingState {

    private boolean visible;

    /**
     * Returns the application-wide greeting state.
     *
     * @return the single greeting-state instance
     */
    public static @NotNull GreetingState getInstance() {
        return ApplicationManager.getApplication().getService(GreetingState.class);
    }

    /**
     * Returns whether the greeting label should be painted.
     *
     * @return true while the label is showing
     */
    public boolean isVisible() {
        return this.visible;
    }

    /**
     * Sets whether the greeting label should be painted.
     *
     * @param visible true to show the label
     */
    public void setVisible(boolean visible) {
        this.visible = visible;
    }
}