自动完成组合框JavaFX中 [英] AutoComplete ComboBox in JavaFX

问题描述

我loooking的方式来增加自动完成到一个JavaFX组合框。
搜索了很多后，它的时间来这里问。

I'm loooking for a way to add autocomplete to a JavaFX ComboBox. After searching a lot it's time to ask here.

这<一个href=\"http://blog.ngopal.com.np/2011/07/04/autofill-textbox-with-filtermode-in-javafx-2-0-custom-control/\">AutoFillBox已知，但不是我寻找。
我要的是一个可编辑的ComboBox和打字时过滤列表schould。但我想也打开列表不键入，看到了整个项目。

This AutoFillBox is known but not what I'm searching. What I want is a editable combobox and while typing the list schould filtered. But I want also to open the list without typing and seeing the whole items.

任何想法？

推荐答案

我发现的工作对我一个解决方案：

I found a solution that's working for me:

public class AutoCompleteComboBoxListener<T> implements EventHandler<KeyEvent> {

    private ComboBox comboBox;
    private StringBuilder sb;
    private ObservableList<T> data;
    private boolean moveCaretToPos = false;
    private int caretPos;

    public AutoCompleteComboBoxListener(final ComboBox comboBox) {
        this.comboBox = comboBox;
        sb = new StringBuilder();
        data = comboBox.getItems();

        this.comboBox.setEditable(true);
        this.comboBox.setOnKeyPressed(new EventHandler<KeyEvent>() {

            @Override
            public void handle(KeyEvent t) {
                comboBox.hide();
            }
        });
        this.comboBox.setOnKeyReleased(AutoCompleteComboBoxListener.this);
    }

    @Override
    public void handle(KeyEvent event) {

        if(event.getCode() == KeyCode.UP) {
            caretPos = -1;
            moveCaret(comboBox.getEditor().getText().length());
            return;
        } else if(event.getCode() == KeyCode.DOWN) {
            if(!comboBox.isShowing()) {
                comboBox.show();
            }
            caretPos = -1;
            moveCaret(comboBox.getEditor().getText().length());
            return;
        } else if(event.getCode() == KeyCode.BACK_SPACE) {
            moveCaretToPos = true;
            caretPos = comboBox.getEditor().getCaretPosition();
        } else if(event.getCode() == KeyCode.DELETE) {
            moveCaretToPos = true;
            caretPos = comboBox.getEditor().getCaretPosition();
        }

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

        ObservableList list = FXCollections.observableArrayList();
        for (int i=0; i<data.size(); i++) {
            if(data.get(i).toString().toLowerCase().startsWith(
                AutoCompleteComboBoxListener.this.comboBox
                .getEditor().getText().toLowerCase())) {
                list.add(data.get(i));
            }
        }
        String t = comboBox.getEditor().getText();

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

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

}

您可以把它叫做

new AutoCompleteComboBoxListener<>(comboBox);

---

它基于<一个href=\"http://tech.chitgoks.com/2013/08/20/how-to-create-autocomplete-combobox-or-textfield-in-java-fx-2/\">this我定制以适合我的需要。

---

It's based on this and I customized it to fit my needs.

随意使用它，如果任何人都可以改善它，请告诉我。

Feel free to use it and if anybody can improve it, tell me.

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