Created
June 8, 2012 09:38
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Sample JavaFX data entry control for maintaining a log of comments.
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| import javafx.application.*; | |
| import javafx.beans.value.*; | |
| import javafx.event.EventHandler; | |
| import javafx.scene.Scene; | |
| import javafx.scene.control.*; | |
| import javafx.scene.input.*; | |
| import javafx.scene.layout.*; | |
| import javafx.scene.web.WebView; | |
| import javafx.stage.Stage; | |
| // an editable log of entered comments. | |
| // https://forums.oracle.com/forums/thread.jspa?threadID=2399060 | |
| // "Go to new line when Shift+Enter is pressed in text area" | |
| public class CommentLog extends Application { | |
| // create some key combination matchers to override default text area key handlers. | |
| final private KeyCombination CTRL_SHIFT_UP = new KeyCodeCombination(KeyCode.UP, KeyCombination.SHIFT_DOWN, KeyCombination.CONTROL_DOWN); | |
| final private KeyCombination CTRL_SHIFT_DOWN = new KeyCodeCombination(KeyCode.DOWN, KeyCombination.SHIFT_DOWN, KeyCombination.CONTROL_DOWN); | |
| final private KeyCombination SHIFT_ENTER = new KeyCodeCombination(KeyCode.ENTER, KeyCombination.SHIFT_DOWN); | |
| final private KeyCombination ENTER = new KeyCodeCombination(KeyCode.ENTER); | |
| final private KeyCombination ESC = new KeyCodeCombination(KeyCode.ESCAPE); | |
| final private String INSTRUCTIONS = | |
| "<body style='background: khaki; font-family: Trebuchet MS; line-height: 140%; font-size: 13px;'>" + | |
| "<strong>Key assignments</strong>" + | |
| "<dl>" + | |
| "<dt>ENTER</dt><dd>Submit comment</dd>" + | |
| "<dt>ESC</dt><dd>Cancel edit</dd>" + | |
| "<dt>SHIFT + ENTER</dt><dd>New line</dd>" + | |
| "<dt>CTRL + SHIFT + UP</dt><dd>Edit previous comment.</dd>" + | |
| "<dt>CTRL + SHIFT + DOWN</dt><dd>Edit next comment.</dd>" + | |
| "</dl>" + | |
| "</body>"; | |
| public static void main(String[] args) { launch(args); } | |
| @Override public void start(Stage stage) { | |
| stage.setTitle("Comment Log"); | |
| // create some html instructions. | |
| final WebView instructions = new WebView(); | |
| instructions.getEngine().loadContent(INSTRUCTIONS); | |
| // a comment log. | |
| final ListView<String> listview = new ListView<>(); | |
| // a text area for entering comments. | |
| final TextArea textArea = new TextArea(); | |
| textArea.setPrefRowCount(4); | |
| textArea.setPromptText("Enter a comment"); | |
| textArea.addEventFilter(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>() { | |
| public void handle(KeyEvent event) { | |
| if (ENTER.match(event)) { // on enter copy the entered text to the listview. | |
| if (!textArea.getText().trim().isEmpty()) { | |
| String selectedItem = listview.getSelectionModel().getSelectedItem(); | |
| if (selectedItem != null) { | |
| if (!selectedItem.equals(textArea.getText())) { // replace the existing selection | |
| listview.getItems().set(listview.getSelectionModel().getSelectedIndex(), textArea.getText()); | |
| listview.getSelectionModel().clearSelection(); | |
| textArea.setText(""); | |
| textArea.clear(); | |
| } | |
| } else { // create a new item | |
| listview.getItems().add(textArea.getText()); | |
| textArea.setText(""); | |
| textArea.clear(); | |
| } | |
| event.consume(); | |
| } | |
| } else if (SHIFT_ENTER.match(event)) { // add a new line. | |
| textArea.deleteText(textArea.getSelection()); | |
| textArea.insertText(textArea.getCaretPosition(), "\n"); | |
| event.consume(); | |
| } else if (ESC.match(event)) { // cancel edit | |
| textArea.clear(); | |
| listview.getSelectionModel().clearSelection(); | |
| } else if (CTRL_SHIFT_UP.match(event)) { // edit previous item | |
| listview.getSelectionModel().selectPrevious(); | |
| event.consume(); | |
| } else if (CTRL_SHIFT_DOWN.match(event)) { // edit next item | |
| listview.getSelectionModel().selectNext(); | |
| event.consume(); | |
| } | |
| } | |
| }); | |
| // when the selection changes, copy it to the text area, so it can be edited. | |
| listview.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<String>() { | |
| @Override public void changed(ObservableValue<? extends String> prop, String before, String after) { | |
| if (after != null && !after.equals(textArea.getText())) { | |
| textArea.setText(after); | |
| Platform.runLater(new Runnable() { | |
| @Override public void run() { | |
| textArea.requestFocus(); | |
| } | |
| }); | |
| } | |
| } | |
| }); | |
| // layout the scene. | |
| VBox.setVgrow(listview, Priority.SOMETIMES); | |
| textArea.setMinHeight(22); | |
| instructions.setMinSize(Control.USE_PREF_SIZE, Control.USE_PREF_SIZE); | |
| instructions.setPrefSize(200, 232); | |
| listview.setPrefHeight(125); | |
| Pane layout = VBoxBuilder.create().spacing(10).children( | |
| LabelBuilder.create().text("Comment").style("-fx-font-weight: bold;").build(), | |
| textArea, | |
| LabelBuilder.create().text("Log").style("-fx-font-weight: bold;").build(), | |
| listview, | |
| instructions | |
| ).build(); | |
| layout.setStyle("-fx-background-color: cornsilk; -fx-padding: 10;"); | |
| stage.setScene(new Scene(layout)); | |
| stage.show(); | |
| } | |
| } |
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https://forums.oracle.com/forums/thread.jspa?threadID=2399060 "Go to new line when Shift+Enter is pressed in text area"