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425 lines
15 KiB
Java
425 lines
15 KiB
Java
package de.thm.tlf.photoViewer;
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import de.thm.tlf.photoViewer.data.PicturePreview;
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import javafx.application.Application;
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import javafx.application.Platform;
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import javafx.beans.binding.Bindings;
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import javafx.beans.property.DoubleProperty;
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import javafx.beans.property.SimpleDoubleProperty;
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import javafx.concurrent.Task;
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import javafx.event.ActionEvent;
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import javafx.event.EventHandler;
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import javafx.geometry.Insets;
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import javafx.geometry.Pos;
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import javafx.scene.Node;
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import javafx.scene.Scene;
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import javafx.scene.control.*;
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import javafx.scene.image.ImageView;
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import javafx.scene.input.KeyCode;
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import javafx.scene.input.KeyCodeCombination;
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import javafx.scene.input.KeyCombination;
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import javafx.scene.layout.*;
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import javafx.stage.FileChooser;
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import javafx.stage.Stage;
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import java.io.File;
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import java.util.List;
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/**
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* Controller Class for Image-viewer.
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* Holds GUI elements as well as the handling of any user input.
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*
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* @author Tim Lukas Förster
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* @version 1.0
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*/
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public class Controller extends Application {
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////////////////////////////
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//------ Attributes ------//
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////////////////////////////
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// CENTER //
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private final ScrollPane currentViewSP = new ScrollPane();
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private final ImageView centerImageView = new ImageView();
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// TOP //
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private final VBox menu = new VBox();
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private final MenuBar menuBar = new MenuBar();
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private final Menu fileMenu = new Menu("File");
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private final Menu aboutMenu = new Menu("About");
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private final MenuItem openFiles = new MenuItem("Open");
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private final MenuItem clearViewer = new Menu("Close all");
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private final MenuItem startSlideShow = new MenuItem("Start Slide Show");
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private final MenuItem exitViewer = new Menu("Exit");
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private final MenuItem showInfo = new Menu("Information");
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// BOTTOM //
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private final VBox bottomPanel = new VBox();
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private final HBox selectionPane = new HBox();
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private final ScrollPane pictureSelector = new ScrollPane();
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private final BorderPane bottomLowerPanel = new BorderPane();
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private final HBox bottomLeft = new HBox();
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private final HBox bottomMid = new HBox();
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private final HBox bottomRight = new HBox();
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private final Button openFilesButton = new Button("Open Pictures");
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private Slider zoomSlider;
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private Slider slideShowSpeedSlider;
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private final Button prevPicBtn = new Button("<-");
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private final Button nextPicBtn = new Button("->");
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private final Button slideShowBtn = new Button("Slide Show");
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private final Button fullScreenBtn = new Button("Fullscreen");
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// Picture handling //
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private PictureHandler picHandler;
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// Etc. //
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private boolean bIsFullScreen = false;
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private boolean bSlideShowActive = false;
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private final DoubleProperty slideShowSpeed = new SimpleDoubleProperty(4);
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private final DoubleProperty zoomProperty = new SimpleDoubleProperty(200);
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private final KeyCombination keyCrtlQ = new KeyCodeCombination(KeyCode.Q, KeyCombination.CONTROL_ANY);
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////////////////////////////////
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//------ End Attributes ------//
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////////////////////////////////
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/////////////////////////
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//------ Methods ------//
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/////////////////////////
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/**
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* Entrypoint to program
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* @param args String-Array supplied when starting the application
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*/
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public static void main(String[] args) {
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launch(args);
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}
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/**
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* Method initializing GUI
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* @param primaryStage Default stage supplied when GUI is created
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*/
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@Override
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public void start(Stage primaryStage) {
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picHandler = PictureHandler.getInstance();
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BorderPane root = new BorderPane();
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root.setCenter(createCenter());
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root.setTop(createTop());
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root.setBottom(createBottom());
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Scene mainScene = new Scene(root, 1200, 800);
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// Create all Actions //
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createSliderActions();
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createMenuActions(primaryStage);
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createButtonActions(primaryStage);
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// Keypress Actions //
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mainScene.setOnKeyPressed(event -> {
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if (keyCrtlQ.match(event)) {
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Platform.exit();
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}
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else{
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switch (event.getCode()) {
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case RIGHT:
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case A:
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try {
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centerImageView.setImage(picHandler.getPrevPicture().getImage());
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} catch (NoPicturesLoadedException npl) {
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showNoPicturesLoadedWarning();
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}
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break;
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case LEFT:
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case D:
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try {
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centerImageView.setImage(picHandler.getNextPicture().getImage());
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} catch (NoPicturesLoadedException npl) {
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showNoPicturesLoadedWarning();
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}
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break;
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}
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}
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});
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primaryStage.setTitle("Photo Viewer");
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primaryStage.setScene(mainScene);
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primaryStage.show();
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}
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/**
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* Task used to run the slideshow in separate Threat.
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*/
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@SuppressWarnings("rawtypes")
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Task slideShowTask = new Task<Void>(){
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@Override
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@SuppressWarnings("BusyWait")
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protected Void call() throws Exception {
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while(bSlideShowActive) {
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Thread.sleep((long)(slideShowSpeed.get()*1000));
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centerImageView.setImage(picHandler.getNextPicture().getImage());
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}
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return null;
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}
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};
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/**
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* Even wrapper for openFileDialogEvent
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* @param stage the primary stage, used to display the file-open-dialog
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* @return EventHandler for dialog handling
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*/
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private EventHandler<ActionEvent> openFileDialogEvent(Stage stage) {
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return e -> openFileDialog(stage);
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}
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/**
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* Event wrapper for clear function
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* @return EventHandle executing the clear function
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*/
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private EventHandler<ActionEvent> clearPreviewViewEvent(){
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return e -> clearPreviewView();
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}
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////////////////////////////////
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//------ Helper-Methods ------//
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////////////////////////////////
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/**
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* Helper method for handling sliders
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*/
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private void createSliderActions() {
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// Zoom Action //
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zoomProperty.addListener(observable -> {
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centerImageView.setFitWidth(zoomProperty.get() * 4);
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centerImageView.setFitHeight(zoomProperty.get() * 3);
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});
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zoomSlider.valueProperty().addListener((observableValue, oldVal, newVal) -> {
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if (oldVal.doubleValue() < newVal.doubleValue()){
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zoomProperty.set(zoomProperty.get() + 10);
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}
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else if (oldVal.doubleValue() > newVal.doubleValue()){
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zoomProperty.set(zoomProperty.get() - 10);
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}
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});
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// SlideShowSpeed Action //
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slideShowSpeed.addListener(observable -> {});
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slideShowSpeedSlider.valueProperty().addListener((observableValue, oldVal, newVal) -> slideShowSpeed.set((double)newVal));
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}
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/**
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* Helper method for handling menus and -entries
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* @param stage the primary stage, used to display the file-open-dialog
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*/
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private void createMenuActions(Stage stage) {
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openFiles.setOnAction(openFileDialogEvent(stage));
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exitViewer.setOnAction( e -> Platform.exit());
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clearViewer.setOnAction(clearPreviewViewEvent());
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}
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/**
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* Helper method for handling button interaction
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* @param stage the primary stage, used to display the file-open-dialog and control fullscreen functions
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*/
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private void createButtonActions(Stage stage) {
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openFilesButton.setOnAction(openFileDialogEvent(stage));
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prevPicBtn.setOnAction(e -> {
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try{
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centerImageView.setImage(picHandler.getPrevPicture().getImage());
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}
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catch (NoPicturesLoadedException npl){ showNoPicturesLoadedWarning();}
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});
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nextPicBtn.setOnAction(e -> {
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try{
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centerImageView.setImage(picHandler.getNextPicture().getImage());
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}
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catch (NoPicturesLoadedException npl){ showNoPicturesLoadedWarning();}
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});
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fullScreenBtn.setOnAction(e -> {
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stage.setFullScreen(!bIsFullScreen);
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bIsFullScreen ^= true;
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});
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slideShowBtn.setOnAction(new EventHandler<>() {
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Thread th;
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@Override
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public void handle(ActionEvent actionEvent) {
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try {
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if (!bSlideShowActive) {
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// This statement is to catch any errors regarding no images loaded
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centerImageView.setImage(picHandler.getNextPicture().getImage());
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bSlideShowActive = true;
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slideShowBtn.setText("Stop Slide Show");
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th = new Thread(slideShowTask);
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th.start();
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} else {
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bSlideShowActive = false;
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slideShowBtn.setText("Slide Show");
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th.interrupt();
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}
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} catch (NoPicturesLoadedException npl){
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showNoPicturesLoadedWarning();
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}
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}
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});
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}
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/**
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* Open file-dialog allowing to select multiple pictures (via filter),
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* adds them to the PictureHandler and updates the picture preview
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* @param stage the primary stage, used to display the file-open-dialog
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*/
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private void openFileDialog(Stage stage) {
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FileChooser fileChooser = new FileChooser();
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fileChooser.setTitle("Open Pictures");
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fileChooser.getExtensionFilters().addAll(
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new FileChooser.ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"));
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List<File> selectedPictures = fileChooser.showOpenMultipleDialog(stage);
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if (selectedPictures != null) {
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try {
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picHandler.loadPictures(selectedPictures);
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Controller.this.updatePreviewView();
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centerImageView.setImage(picHandler.getNextPicture().getImage());
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} catch (NoPicturesLoadedException npl) {
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showNoPicturesLoadedWarning();
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}
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}
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}
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/**
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* Method that updates the preview Pane with all PreviewPictures provided by the Picture Handler
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*/
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private void updatePreviewView(){
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clearPreviewView();
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selectionPane.setPadding(new Insets(5,5,5,5));
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for(PicturePreview pp: picHandler.getPreviews()){
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ImageView iv = new ImageView(pp.getImage());
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iv.setFitWidth(150);
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iv.setFitHeight(150);
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iv.setSmooth(true);
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iv.setPreserveRatio(true);
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selectionPane.getChildren().add(iv);
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}
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}
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/**
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* Used to clear the preview and center panel when the viewer is cleared
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*/
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private void clearPreviewView(){
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selectionPane.getChildren().clear();
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selectionPane.setPadding(new Insets(5,155,5,5));
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centerImageView.setImage(null);
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}
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/**
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* Method that handles the settings and layout of the top Panel
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* @return Node, set up for displaying on the top of a GridPane
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*/
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private Node createTop(){
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SeparatorMenuItem sep = new SeparatorMenuItem();
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// File Menu
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fileMenu.getItems().addAll(openFiles, clearViewer, sep, startSlideShow, exitViewer);
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// About Menu
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aboutMenu.getItems().addAll(showInfo);
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// Menu bar
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menuBar.getMenus().addAll(fileMenu, aboutMenu);
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// Adding Menus to Top Panel
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menu.getChildren().addAll(menuBar);
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return menu;
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}
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/**
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* Method that handles the settings and layout of the center Panel
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* @return Node, set up for displaying on the center of a GridPane
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*/
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private Node createCenter(){
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// Use stack pane and magic to center the image on screen
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StackPane imageHolder = new StackPane(centerImageView);
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GridPane grid = new GridPane();
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currentViewSP.setContent(imageHolder);
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imageHolder.minWidthProperty().bind(Bindings.createDoubleBinding(() ->
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currentViewSP.getViewportBounds().getWidth(), currentViewSP.viewportBoundsProperty()));
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imageHolder.minHeightProperty().bind(Bindings.createDoubleBinding(() ->
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currentViewSP.getViewportBounds().getHeight(), currentViewSP.viewportBoundsProperty()));
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grid.getChildren().add(imageHolder);
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centerImageView.setX(10);
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centerImageView.setY(10);
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centerImageView.setPreserveRatio(true);
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return currentViewSP;
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}
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/**
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* Method that handles the settings and layout of the bottom Panel
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* @return Node, set up for displaying on the bottom of a GridPane
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*/
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private Node createBottom() {
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bottomLowerPanel.setPadding(new Insets(5, 5, 5, 5));
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// Left Bottom Part
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zoomSlider = new Slider(0, 100, 25);
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zoomSlider.setShowTickMarks(true);
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Label zoomLabel = new Label("Zoom:");
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bottomLeft.getChildren().addAll(openFilesButton, zoomLabel, zoomSlider);
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//bottomLeft.getChildren().addAll(zoomLabel, zoomSlider);
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bottomLeft.setSpacing(5);
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bottomLowerPanel.setLeft(bottomLeft);
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// Middle Bottom Part
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bottomMid.setAlignment(Pos.CENTER);
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bottomMid.setSpacing(5);
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bottomMid.getChildren().addAll(prevPicBtn, slideShowBtn, nextPicBtn);
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bottomLowerPanel.setCenter(bottomMid);
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// Right Bottom Part
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slideShowSpeedSlider = new Slider(0.5, 15, 4);
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slideShowSpeedSlider.setShowTickMarks(true);
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slideShowSpeedSlider.setShowTickLabels(true);
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Label sssLabel = new Label("Speed:");
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bottomRight.getChildren().addAll(sssLabel,slideShowSpeedSlider, fullScreenBtn);
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bottomLowerPanel.setRight(bottomRight);
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// Bottom upper Part -> Picture preview
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selectionPane.setPadding(new Insets(5,5,155,5));
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selectionPane.autosize();
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selectionPane.setSpacing(5);
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pictureSelector.setContent(selectionPane);
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bottomPanel.getChildren().addAll(pictureSelector, bottomLowerPanel);
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return (bottomPanel);
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}
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/**
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* Displays a warning dialogue informing the user that no pictures has been loaded yet
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* and the executed action is not possible.
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*/
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private void showNoPicturesLoadedWarning(){
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Alert alert = new Alert(Alert.AlertType.WARNING);
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alert.setTitle("No pictures loaded");
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alert.setContentText("No pictures have been loaded" +
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"\nPlease select pictures via the menu or via the open button to view them.");
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alert.showAndWait().ifPresent(rs -> {
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});
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}
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////////////////////////////////////
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//------ End Helper-Methods ------//
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////////////////////////////////////
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/////////////////////////////
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//------ End Methods ------//
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/////////////////////////////
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}
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