180 lines
4.7 KiB
Java
180 lines
4.7 KiB
Java
package envoy.client.ui;
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import java.io.IOException;
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import java.util.Stack;
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import java.util.logging.Level;
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import javafx.fxml.FXMLLoader;
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import javafx.scene.Parent;
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import javafx.scene.Scene;
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import javafx.stage.Stage;
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import envoy.client.data.Settings;
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import envoy.client.event.ThemeChangeEvent;
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import envoy.event.EventBus;
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import envoy.util.EnvoyLog;
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/**
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* Manages a stack of scenes. The most recently added scene is displayed inside
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* a stage. When a scene is removed from the stack, its predecessor is
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* displayed.
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* <p>
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* When a scene is loaded, the style sheet for the current theme is applied to
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* it.
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* <p>
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* Project: <strong>envoy-client</strong><br>
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* File: <strong>SceneContext.java</strong><br>
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* Created: <strong>06.06.2020</strong><br>
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*
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* @author Kai S. K. Engelbart
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* @since Envoy Client v0.1-beta
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*/
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public final class SceneContext {
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/**
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* Contains information about different scenes and their FXML resource files.
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*
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* @author Kai S. K. Engelbart
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* @since Envoy Client v0.1-beta
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*/
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public enum SceneInfo {
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/**
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* The main scene in which the chat screen is displayed.
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*
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* @since Envoy Client v0.1-beta
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*/
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CHAT_SCENE("/fxml/ChatScene.fxml"),
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/**
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* The scene in which the settings screen is displayed.
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*
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* @since Envoy Client v0.1-beta
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*/
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SETTINGS_SCENE("/fxml/SettingsScene.fxml"),
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/**
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* The scene in which the contact search screen is displayed.
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*
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* @since Envoy Client v0.1-beta
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*/
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CONTACT_SEARCH_SCENE("/fxml/ContactSearchScene.fxml"),
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/**
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* The scene in which the group creation screen is displayed.
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*
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* @since Envoy Client v0.1-beta
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*/
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GROUP_CREATION_SCENE("/fxml/GroupCreationScene.fxml"),
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/**
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* The scene in which the login screen is displayed.
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*
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* @since Envoy Client v0.1-beta
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*/
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LOGIN_SCENE("/fxml/LoginScene.fxml"),
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/**
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* The scene in which the info screen is displayed.
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*
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* @since Envoy Client v0.1-beta
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*/
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MESSAGE_INFO_SCENE("/fxml/MessageInfoScene.fxml");
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/**
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* The path to the FXML resource.
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*/
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public final String path;
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SceneInfo(String path) { this.path = path; }
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}
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private final Stage stage;
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private final FXMLLoader loader = new FXMLLoader();
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private final Stack<Scene> sceneStack = new Stack<>();
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private final Stack<Object> controllerStack = new Stack<>();
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private static final Settings settings = Settings.getInstance();
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/**
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* Initializes the scene context.
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*
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* @param stage the stage in which scenes will be displayed
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* @since Envoy Client v0.1-beta
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*/
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public SceneContext(Stage stage) {
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this.stage = stage;
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EventBus.getInstance().register(ThemeChangeEvent.class, theme -> applyCSS());
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}
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/**
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* Loads a new scene specified by a scene info.
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*
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* @param sceneInfo specifies the scene to load
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* @throws RuntimeException if the loading process fails
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* @since Envoy Client v0.1-beta
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*/
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public void load(SceneInfo sceneInfo) {
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loader.setRoot(null);
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loader.setController(null);
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try {
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final var rootNode = (Parent) loader.load(getClass().getResourceAsStream(sceneInfo.path));
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final var scene = new Scene(rootNode);
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controllerStack.push(loader.getController());
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sceneStack.push(scene);
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stage.setScene(scene);
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applyCSS();
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stage.sizeToScene();
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stage.show();
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} catch (final IOException e) {
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EnvoyLog.getLogger(SceneContext.class).log(Level.SEVERE, String.format("Could not load scene for %s: ", sceneInfo), e);
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throw new RuntimeException(e);
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}
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}
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/**
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* Removes the current scene and displays the previous one.
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*
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* @since Envoy Client v0.1-beta
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*/
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public void pop() {
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sceneStack.pop();
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controllerStack.pop();
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if (!sceneStack.isEmpty()) {
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final var newScene = sceneStack.peek();
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stage.setScene(newScene);
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applyCSS();
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stage.sizeToScene();
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// If the controller implements the Restorable interface,
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// the actions to perform on restoration will be executed here
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final var controller = controllerStack.peek();
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if (controller instanceof Restorable) ((Restorable) controller).onRestore();
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}
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stage.show();
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}
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private void applyCSS() {
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if (!sceneStack.isEmpty()) {
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final var styleSheets = stage.getScene().getStylesheets();
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final var themeCSS = "/css/" + settings.getCurrentTheme() + ".css";
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styleSheets.clear();
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styleSheets.addAll(getClass().getResource("/css/base.css").toExternalForm(), getClass().getResource(themeCSS).toExternalForm());
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}
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}
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/**
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* @param <T> the type of the controller
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* @return the controller used by the current scene
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* @since Envoy Client v0.1-beta
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*/
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public <T> T getController() { return (T) controllerStack.peek(); }
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/**
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* @return the stage in which the scenes are displayed
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* @since Envoy Client v0.1-beta
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*/
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public Stage getStage() { return stage; }
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}
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