JavaFX auto Complete Combo Box - Java JavaFX

Java examples for JavaFX:ComboBox

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Description

JavaFX auto Complete Combo Box

Demo Code

// Licensed under the Apache License, Version 2.0 (the "License");
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.control.ComboBox;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;

public class Main{
    public static <T> void autoCompleteComboBox(ComboBox<T> comboBox, AutoCompleteMode mode) {
    final ObservableList<T> data = comboBox.getItems();

    comboBox.setEditable(true);/*w  w  w. ja v a2 s .  c  om*/
    comboBox.getEditor().focusedProperty().addListener(observable -> {
        if (0 > comboBox.getSelectionModel().getSelectedIndex()) {
            comboBox.getEditor().setText(null);
        }
    });
    comboBox.addEventHandler(KeyEvent.KEY_PRESSED, t -> comboBox.hide());
    comboBox.addEventHandler(KeyEvent.KEY_RELEASED, new EventHandler<KeyEvent>() {

        private boolean moveCaretToPos = false;
        private int caretPos;

        @Override
        public void handle(KeyEvent event) {
            switch (event.getCode()) {
                case DOWN:
                    if (!comboBox.isShowing()) {
                        comboBox.show();
                    }
                case UP:
                    caretPos = -1;
                    moveCaret(comboBox.getEditor().getText().length());
                    return;
                case BACK_SPACE:
                case DELETE:
                    moveCaretToPos = true;
                    caretPos = comboBox.getEditor().getCaretPosition();
                    break;
            }

            if (KeyCode.RIGHT == event.getCode() || KeyCode.LEFT == event.getCode()
                    || event.isControlDown() || KeyCode.HOME == event.getCode()
                    || KeyCode.END == event.getCode() || KeyCode.TAB == event.getCode()) {
                return;
            }

            final ObservableList<T> list = FXCollections.observableArrayList();
            for (T aData : data) {
                if (shouldDataBeAddedToInput(aData)) {
                    list.add(aData);
                }
            }
            final String text = comboBox.getEditor().getText();

            comboBox.setItems(list);
            comboBox.getEditor().setText(text);
            if (!moveCaretToPos) {
                caretPos = -1;
            }
            moveCaret(text.length());
            if (!list.isEmpty()) {
                comboBox.show();
            }
        }

        private boolean shouldDataBeAddedToInput(T aData) {
            return mode.equals(AutoCompleteMode.STARTS_WITH) && inputStartsWith(aData)
                    || mode.equals(AutoCompleteMode.CONTAINING) && inputContains(aData);
        }

        private boolean inputStartsWith(T aData) {
            final String dataValue = aData.toString().toLowerCase();
            final String inputValue = comboBox.getEditor().getText().toLowerCase();
            return dataValue.startsWith(inputValue);
        }

        private boolean inputContains(T aData) {
            final String dataValue = aData.toString().toLowerCase();
            final String inputValue = comboBox.getEditor().getText().toLowerCase();
            return dataValue.contains(inputValue);
        }

        private void moveCaret(int textLength) {
            if (-1 == caretPos) {
                comboBox.getEditor().positionCaret(textLength);
            } else {
                comboBox.getEditor().positionCaret(caretPos);
            }
            moveCaretToPos = false;
        }
    });
}
}

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