Question

在我的可编辑ComboBox中，由于输入过滤了我的建议，我可以触发Button个事件。问题是，如果我在可编辑字段中键入我的项目名称之一（如action3）并单击第一个建议（也是action3），这是合适的项目，它始终使用第一个索引action1触发ButtonEvent，因为它具有第一个索引，但第一个索引是action1。

List<EventHandler<ActionEvent>> handlers = Arrays.asList(
            this::action1,
            this::action2,
            this::action3
            );

那么如何将action1与我的建议正确建议联系起来？

public void onEnter(ActionEvent event){
    int index = editableComboBox.getSelectionModel().getSelectedIndex();
    if (index >= 0) {
         handlers.get(index).handle(event);
    }

}

编辑1：

我的新initialize（）方法如下所示：

protected void initialize() {
    new AutoCompleteBox<>(autoBox);     
    ObservableList<ActionEventHandler> data = FXCollections.observableArrayList(
            new ActionEventHandler("action1", this::action1),
            new ActionEventHandler("action2", this::action2,
            new ActionEventHandler("action3", this::action3)
    );
    autoBox.getItems().setAll(data);
    FilteredList<ActionEventHandler> filtered = new FilteredList<>(data);
    ComboBox<ActionEventHandler> autoBox = new ComboBox<>(filtered);
    autoBox.setOnAction(event -> {
        ActionEventHandler h = autoBox.getValue();
        if (h != null) {
            h.handle(event);
        }
    });
    autoBox.setEditable(true);
    autoBox.setConverter(new StringConverter<ActionEventHandler>() {

        @Override
        public String toString(ActionEventHandler object) {
            return object == null ? "" : object.toString();
        }

        @Override
        public ActionEventHandler fromString(String string) {
            if (string == null) {
                return null;
            }
            for (ActionEventHandler h : data) {
                if (string.equals(h.toString())) {
                    return h;
                }
            }
            return null;
        }

    });

    autoBox.getEditor().textProperty().addListener((observable, oldValue, newValue) -> {
        filtered.setPredicate(h -> h.toString().startsWith(newValue));
    });

}

自定义ComboBox类：

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

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

    public AutoCompleteBox(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(AutoCompleteBox.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(
                    AutoCompleteBox.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;
    }
}

我无法将这些功能（例如action1）与字符串action1相关联，或者我更相信，我无法将自定义类与我的自定义{{1 }}

Answer 1

在这种情况下，似乎最好使用EventHandler<ActionEvent> s作为返回toString字符串的项目。添加converter以将项目转换为非String对象。

public class ActionEventHandler implements EventHandler<ActionEvent> {

    private final EventHandler<ActionEvent> eventHandler;
    private final String name;

    public ActionEventHandler(String name, EventHandler<ActionEvent> eventHandler) {
        Objects.requireNonNull(name);
        Objects.requireNonNull(eventHandler);
        this.name = name;
        this.eventHandler = eventHandler;
    }

    @Override
    public String toString() {
        return name;
    }

    @Override
    public void handle(ActionEvent event) {
        eventHandler.handle(event);
    }

}

ObservableList<ActionEventHandler> data = FXCollections.observableArrayList(
        new ActionEventHandler("action1", this::action1),
        new ActionEventHandler("action2", this::action2),
        new ActionEventHandler("action3", this::action3)
);
FilteredList<ActionEventHandler> filtered = new FilteredList<>(data);
ComboBox<ActionEventHandler> comboBox = new ComboBox<>(filtered);
comboBox.setOnAction(event -> {
    ActionEventHandler h = comboBox.getValue();
    if (h != null) {
        h.handle(event);
    }
});
comboBox.setEditable(true);
comboBox.setConverter(new StringConverter<ActionEventHandler>() {

    @Override
    public String toString(ActionEventHandler object) {
        return object == null ? "" : object.toString();
    }

    @Override
    public ActionEventHandler fromString(String string) {
        if (string == null) {
            return null;
        }
        for (ActionEventHandler h : data) {
            if (string.equals(h.toString())) {
                return h;
            }
        }
        return null;
    }

});
comboBox.getEditor().textProperty().addListener((observable, oldValue, newValue) -> {
    filtered.setPredicate(h -> h.toString().startsWith(newValue));
});

修改

以下代码应与您的AutoCompleteBox类一起使用。

@FXML private ComboBox<ActionEventHandler> autoBox; @FXML private void initialize() { autoBox.getItems().setAll( new ActionEventHandler("action1", this::action1), new ActionEventHandler("action2", this::action2), new ActionEventHandler("action3", this::action3)); autoBox.setOnAction(event -> { ActionEventHandler h = autoBox.getValue(); if (h != null) { h.handle(event); } }); autoBox.setConverter(new StringConverter<ActionEventHandler>() { @Override public String toString(ActionEventHandler object) { return object == null ? "" : object.toString(); } @Override public ActionEventHandler fromString(String string) { if (string == null) { return null; } for (ActionEventHandler h : autoBox.getItems()) { if (string.equals(h.toString())) { return h; } } return null; } }); new AutoCompleteBox<>(autoBox); }

（虽然我没有查看AutoCompleteBox课程的详细信息...）

Answer 2

尝试获取项目的字符串并检查字符串内容。如果它的＆＃34; action3＆＃34;你将事件称为action3。代码：(String) cbKategorieMain.getSelectedItem()会将组合框的内容作为字符串

将已过滤的Combobox项链接到输入

2 个答案: