Javafx 在按键时选择组合框选项。我希望选择模型自动滚动/跳转到所选选项

到目前为止我拥有的：

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

        Scene scene = new Scene(root, 850.0, 650.0);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.SingleSelectionModel;
import javafx.scene.input.KeyCode;

public class SampleController implements Initializable {

    @FXML private ComboBox<String> cb;

    //Entered random options
    private final ObservableList<String> options = FXCollections.observableArrayList(
            "Aab",
            "Aer",
            "Aeq",
            "Arx",
            "Byad",
            "Csca",
            "Csee",
            "Cfefe",
            "Cead",
            "Defea",
            "Dqeqe",
            "Fefaf",
            "Gert",
            "Wqad",
            "Xsad",
            "Zzz"
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        cb.getItems().addAll(options);

        selectOptionOnKey();
    }

    /* When you press a letter key
    *  this method will search for an option(item) that starts with the input letter key 
    *  and it selects the first occurrence in combo box
    */
    public void selectOptionOnKey() {
        cb.setOnKeyPressed(e -> {
            KeyCode keyCode = e.getCode();

            if (keyCode.isLetterKey()) {
                char key = keyCode.getName().charAt(0);

                SingleSelectionModel<String> cbSelectionModel = cb.getSelectionModel();

                cbSelectionModel.select(0);

                for (int i = 0; i < options.size(); i++) {
                    if(cbSelectionModel.getSelectedItem().charAt(0) == key) {
                        // option which starts with the input letter found -> select it
                        cbSelectionModel.select(i);
                        /* Before exiting the function it would be nice if after the selection,
                           the combo box would auto slide/jump to the option which is selected.
                           I don't know how to do that. */
                        return;
                    }
                    else
                        cbSelectionModel.selectNext();
                }   
            }
        });
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SampleController">
   <children>
      <ComboBox fx:id="cb" layoutX="300.0" layoutY="300.0" prefHeight="25.0" prefWidth="173.0" />
   </children>
</AnchorPane>

例如，当我按下C键按钮时，会发生以下情况：

selectOptionOnKey（见下文）功能选择以字母C开头的选项

问题：

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

        Scene scene = new Scene(root, 850.0, 650.0);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.SingleSelectionModel;
import javafx.scene.input.KeyCode;

public class SampleController implements Initializable {

    @FXML private ComboBox<String> cb;

    //Entered random options
    private final ObservableList<String> options = FXCollections.observableArrayList(
            "Aab",
            "Aer",
            "Aeq",
            "Arx",
            "Byad",
            "Csca",
            "Csee",
            "Cfefe",
            "Cead",
            "Defea",
            "Dqeqe",
            "Fefaf",
            "Gert",
            "Wqad",
            "Xsad",
            "Zzz"
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        cb.getItems().addAll(options);

        selectOptionOnKey();
    }

    /* When you press a letter key
    *  this method will search for an option(item) that starts with the input letter key 
    *  and it selects the first occurrence in combo box
    */
    public void selectOptionOnKey() {
        cb.setOnKeyPressed(e -> {
            KeyCode keyCode = e.getCode();

            if (keyCode.isLetterKey()) {
                char key = keyCode.getName().charAt(0);

                SingleSelectionModel<String> cbSelectionModel = cb.getSelectionModel();

                cbSelectionModel.select(0);

                for (int i = 0; i < options.size(); i++) {
                    if(cbSelectionModel.getSelectedItem().charAt(0) == key) {
                        // option which starts with the input letter found -> select it
                        cbSelectionModel.select(i);
                        /* Before exiting the function it would be nice if after the selection,
                           the combo box would auto slide/jump to the option which is selected.
                           I don't know how to do that. */
                        return;
                    }
                    else
                        cbSelectionModel.selectNext();
                }   
            }
        });
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SampleController">
   <children>
      <ComboBox fx:id="cb" layoutX="300.0" layoutY="300.0" prefHeight="25.0" prefWidth="173.0" />
   </children>
</AnchorPane>

组合框存储了可同时显示的更多选项。因此，当选择的选项不在显示区域时，我希望组合框向下滚动/跳转到该选项，但我不知道如何操作

---

示例代码：

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

        Scene scene = new Scene(root, 850.0, 650.0);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.SingleSelectionModel;
import javafx.scene.input.KeyCode;

public class SampleController implements Initializable {

    @FXML private ComboBox<String> cb;

    //Entered random options
    private final ObservableList<String> options = FXCollections.observableArrayList(
            "Aab",
            "Aer",
            "Aeq",
            "Arx",
            "Byad",
            "Csca",
            "Csee",
            "Cfefe",
            "Cead",
            "Defea",
            "Dqeqe",
            "Fefaf",
            "Gert",
            "Wqad",
            "Xsad",
            "Zzz"
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        cb.getItems().addAll(options);

        selectOptionOnKey();
    }

    /* When you press a letter key
    *  this method will search for an option(item) that starts with the input letter key 
    *  and it selects the first occurrence in combo box
    */
    public void selectOptionOnKey() {
        cb.setOnKeyPressed(e -> {
            KeyCode keyCode = e.getCode();

            if (keyCode.isLetterKey()) {
                char key = keyCode.getName().charAt(0);

                SingleSelectionModel<String> cbSelectionModel = cb.getSelectionModel();

                cbSelectionModel.select(0);

                for (int i = 0; i < options.size(); i++) {
                    if(cbSelectionModel.getSelectedItem().charAt(0) == key) {
                        // option which starts with the input letter found -> select it
                        cbSelectionModel.select(i);
                        /* Before exiting the function it would be nice if after the selection,
                           the combo box would auto slide/jump to the option which is selected.
                           I don't know how to do that. */
                        return;
                    }
                    else
                        cbSelectionModel.selectNext();
                }   
            }
        });
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SampleController">
   <children>
      <ComboBox fx:id="cb" layoutX="300.0" layoutY="300.0" prefHeight="25.0" prefWidth="173.0" />
   </children>
</AnchorPane>

Main:

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

        Scene scene = new Scene(root, 850.0, 650.0);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.SingleSelectionModel;
import javafx.scene.input.KeyCode;

public class SampleController implements Initializable {

    @FXML private ComboBox<String> cb;

    //Entered random options
    private final ObservableList<String> options = FXCollections.observableArrayList(
            "Aab",
            "Aer",
            "Aeq",
            "Arx",
            "Byad",
            "Csca",
            "Csee",
            "Cfefe",
            "Cead",
            "Defea",
            "Dqeqe",
            "Fefaf",
            "Gert",
            "Wqad",
            "Xsad",
            "Zzz"
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        cb.getItems().addAll(options);

        selectOptionOnKey();
    }

    /* When you press a letter key
    *  this method will search for an option(item) that starts with the input letter key 
    *  and it selects the first occurrence in combo box
    */
    public void selectOptionOnKey() {
        cb.setOnKeyPressed(e -> {
            KeyCode keyCode = e.getCode();

            if (keyCode.isLetterKey()) {
                char key = keyCode.getName().charAt(0);

                SingleSelectionModel<String> cbSelectionModel = cb.getSelectionModel();

                cbSelectionModel.select(0);

                for (int i = 0; i < options.size(); i++) {
                    if(cbSelectionModel.getSelectedItem().charAt(0) == key) {
                        // option which starts with the input letter found -> select it
                        cbSelectionModel.select(i);
                        /* Before exiting the function it would be nice if after the selection,
                           the combo box would auto slide/jump to the option which is selected.
                           I don't know how to do that. */
                        return;
                    }
                    else
                        cbSelectionModel.selectNext();
                }   
            }
        });
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SampleController">
   <children>
      <ComboBox fx:id="cb" layoutX="300.0" layoutY="300.0" prefHeight="25.0" prefWidth="173.0" />
   </children>
</AnchorPane>

控制器：

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

        Scene scene = new Scene(root, 850.0, 650.0);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.SingleSelectionModel;
import javafx.scene.input.KeyCode;

public class SampleController implements Initializable {

    @FXML private ComboBox<String> cb;

    //Entered random options
    private final ObservableList<String> options = FXCollections.observableArrayList(
            "Aab",
            "Aer",
            "Aeq",
            "Arx",
            "Byad",
            "Csca",
            "Csee",
            "Cfefe",
            "Cead",
            "Defea",
            "Dqeqe",
            "Fefaf",
            "Gert",
            "Wqad",
            "Xsad",
            "Zzz"
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        cb.getItems().addAll(options);

        selectOptionOnKey();
    }

    /* When you press a letter key
    *  this method will search for an option(item) that starts with the input letter key 
    *  and it selects the first occurrence in combo box
    */
    public void selectOptionOnKey() {
        cb.setOnKeyPressed(e -> {
            KeyCode keyCode = e.getCode();

            if (keyCode.isLetterKey()) {
                char key = keyCode.getName().charAt(0);

                SingleSelectionModel<String> cbSelectionModel = cb.getSelectionModel();

                cbSelectionModel.select(0);

                for (int i = 0; i < options.size(); i++) {
                    if(cbSelectionModel.getSelectedItem().charAt(0) == key) {
                        // option which starts with the input letter found -> select it
                        cbSelectionModel.select(i);
                        /* Before exiting the function it would be nice if after the selection,
                           the combo box would auto slide/jump to the option which is selected.
                           I don't know how to do that. */
                        return;
                    }
                    else
                        cbSelectionModel.selectNext();
                }   
            }
        });
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SampleController">
   <children>
      <ComboBox fx:id="cb" layoutX="300.0" layoutY="300.0" prefHeight="25.0" prefWidth="173.0" />
   </children>
</AnchorPane>

import java.net.URL；
导入java.util.ResourceBundle；
导入javafx.collections.FXCollections；
导入javafx.collections.ObservableList；
导入javafx.fxml.fxml；
导入javafx.fxml.Initializable；
导入javafx.scene.control.ComboBox；
导入javafx.scene.control.SingleSelectionModel；
导入javafx.scene.input.KeyCode；
公共类SampleController实现可初始化{
@FXML专用组合框cb；
//输入随机选项
private final ObservableList options=FXCollections.observableArrayList(
“Aab”，
“Aer”，
“Aeq”，
“Arx”，
“拜亚德”，
“欧安会”，
“Csee”，
“Cfefe”，
“消除种族歧视委员会”，
“Defea”，
“DQE”，
“Fefaf”，
“格特”，
“Wqad”，
“Xsad”，
“Zzz”
);
@凌驾
公共void初始化（URL位置、ResourceBundle资源）{
cb.getItems（）.addAll（选项）；
选择optiononkey（）；
}
/*当你按字母键时
*此方法将搜索以输入字母键开头的选项（项）
*并选择组合框中的第一个匹配项
*/
public void selectOptionOnKey（）{
cb.按下设置键（e->{
KeyCode KeyCode=e.getCode（）；
if（keyCode.isleterkey（））{
char key=keyCode.getName（）.charAt（0）；
SingleSelectionModel cbSelectionModel=cb.getSelectionModel（）；
cbSelectionModel.select（0）；
对于（int i=0；i选择它
cbSelectionModel.选择（i）；
/*在退出功能之前，如果在选择之后，
组合框将自动滑动/跳转到选定的选项。
我不知道怎么做*/
返回；
}
其他的
cbSelectionModel.selectNext（）；
}   
}
});
}
}

FXML:

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{

        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

        Scene scene = new Scene(root, 850.0, 650.0);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.SingleSelectionModel;
import javafx.scene.input.KeyCode;

public class SampleController implements Initializable {

    @FXML private ComboBox<String> cb;

    //Entered random options
    private final ObservableList<String> options = FXCollections.observableArrayList(
            "Aab",
            "Aer",
            "Aeq",
            "Arx",
            "Byad",
            "Csca",
            "Csee",
            "Cfefe",
            "Cead",
            "Defea",
            "Dqeqe",
            "Fefaf",
            "Gert",
            "Wqad",
            "Xsad",
            "Zzz"
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        cb.getItems().addAll(options);

        selectOptionOnKey();
    }

    /* When you press a letter key
    *  this method will search for an option(item) that starts with the input letter key 
    *  and it selects the first occurrence in combo box
    */
    public void selectOptionOnKey() {
        cb.setOnKeyPressed(e -> {
            KeyCode keyCode = e.getCode();

            if (keyCode.isLetterKey()) {
                char key = keyCode.getName().charAt(0);

                SingleSelectionModel<String> cbSelectionModel = cb.getSelectionModel();

                cbSelectionModel.select(0);

                for (int i = 0; i < options.size(); i++) {
                    if(cbSelectionModel.getSelectedItem().charAt(0) == key) {
                        // option which starts with the input letter found -> select it
                        cbSelectionModel.select(i);
                        /* Before exiting the function it would be nice if after the selection,
                           the combo box would auto slide/jump to the option which is selected.
                           I don't know how to do that. */
                        return;
                    }
                    else
                        cbSelectionModel.selectNext();
                }   
            }
        });
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SampleController">
   <children>
      <ComboBox fx:id="cb" layoutX="300.0" layoutY="300.0" prefHeight="25.0" prefWidth="173.0" />
   </children>
</AnchorPane>

---

非常感谢您的帮助。

作为一般行为，虚拟控件中的选择不会将所选索引/项目滚动到可见区域。有点惊讶的是，组合框下拉列表中的列表也不例外，这条规则应该在打开时选择的列表中是可见的

解决方法是在代码中滚动新选择的项目。这包括：

• 抓住组合框的皮肤
• 通过

  skin.getPopupContent（）

  获取listView：虽然该方法是公共的，但其返回类型是一个实现细节
• 调用

  列表。滚动到（索引）

只要选择发生更改，就可以调用代码段，即密钥处理程序中的f.i.：

cbSelectionModel.select(i);
ComboBoxListViewSkin<?> skin = (ComboBoxListViewSkin<?>) cb.getSkin();
ListView<?> list = (ListView<?>) skin.getPopupContent();
list.scrollTo(i);

cbSelectionModel.选择（i）；
ComboBoxListViewSkin=（ComboBoxListViewSkin）cb.getSkin（）；
ListView列表=（ListView）skin.getPopupContent（）；
列表。滚动至（i）；

请提供一个示例来说明问题。正如你在前面的问题中已经提出的那样。。现在就做-如果没有它，它是不可回答的（在你非常私人的环境中，有很多事情可能会出错，无法知道它是什么）好的，现在我明白你的意思了，谢谢你的例子：）嗯。。可能是个bug，也可能不是：导航键确实会触发滚动，但选择通常不会触发滚动（即使在打开之前选择了，这也是我最不希望看到的）。需要挖一点。。