Question

我想找出一种方法选中了哪些复选框，而未选中它们。此外，我想了解如何在ChomboBox中添加标签，例如有数字可供选择，从1-9的标题为“弱”，从10-20的标题为“强”，但是您只能从数字中选择，而不能从标题中选择。

谢谢您的建议

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.Initializable;
import javafx.scene.control.*;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.text.Font;

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

public class Controller implements Initializable {
    public Label l1,l2,l3,l4,l5,l6,l7,l8;
    public Button generovatB;
    public TextField jtxt1;
    public ComboBox cbox1;
    public CheckBox cb1,cb2,cb3,cb4,cb7;
    public Font x2;
    public ImageView imgvBck;
    //created by Z.K. =
    private char[] lower = {'a','b','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
    private char[] upper = {'A','B','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
    private char[] special = {'#','&','@','{','}','[',']','+','-','*','/','?','.',':','!','§',')','(','/','%','=',';','<','>','ß','$'};
    private char[] numbers = {'1','2','3','4','5','6','7','8','9','0'};
    private String[] words = new String[1000];



    public void generovatB(ActionEvent actionEvent) {


    }


    public void naplnPole(){


}

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        Image pozadi = new Image("obr.png",650,500,true,false,false);
        imgvBck.setImage(pozadi);
        ObservableList<String> options =
                FXCollections.observableArrayList("5","7","9","15","18"
                );
        cbox1.setItems(options);

    }
}

Answer 1

我不确定，但是如果我正确理解了您的问题，则希望将组合框中的数字与标题分组，然后让用户使用复选框进行选择。另外，您还可以找到选择的号码。

如果这是您的问题，如@Daniel所建议，您必须使用ListCell来修改单元格中的内容。首先，我建议组合框有一个单独的模型来处理选择。这将比通过检查所有CheckBox选定项的操作容易得多。

class Level {
        private IntegerProperty level = new SimpleIntegerProperty();
        private BooleanProperty selected = new SimpleBooleanProperty();
        ...
}

要实现CheckBox，可以使用CheckBoxListCell，但是由于需要额外的条件来显示组标题，因此可能无法正确设置。因此，我建议根据需求创建自定义单元工厂。

// Implementing with CheckBoxListCell
Callback<ListView<Level>, ListCell<Level>> forListView = CheckBoxListCell.forListView(Level::selectedProperty);
comboBox.setCellFactory(forListView);

您需要考虑的另一步是在单击任何单元格时关闭弹出窗口的自动隐藏功能。这样一来，您无需关闭弹出窗口即可进行多项选择。

final ComboBox<Level> comboBox = new ComboBox<Level>(items) {
            protected javafx.scene.control.Skin<?> createDefaultSkin() {
                return new ComboBoxListViewSkin<Level>(this) {
                    @Override
                    protected boolean isHideOnClickEnabled() {
                        return false;
                    }
                };
            }
        };

要找到选定的编号，您要做的就是循环遍历ComboBox中的项目并检查模型的选定值。

comboBox.getItems().stream().filter(Level::isSelected).forEach(selectedItem->{
      // Do with your selected item
});

考虑到以上所有内容，根据我对问题的理解，以下是一个有效的演示。

import com.sun.javafx.scene.control.skin.ComboBoxListViewSkin;
import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Callback;

import java.util.stream.Collectors;

public class HeadingInComboBoxDemo extends Application {

    private final int WEAK_INDEX = -1;
    private final int STRONG_INDEX = -2;

    @Override
    public void start(Stage stage) throws Exception {
        VBox root = new VBox();
        root.setSpacing(15);
        root.setPadding(new Insets(25));
        root.setAlignment(Pos.TOP_LEFT);
        Scene sc = new Scene(root, 600, 600);
        stage.setScene(sc);
        stage.show();

        final ObservableList<Level> items = FXCollections.observableArrayList();
        for (int i = 1; i < 11; i++) {
            if (i == 1) {
                items.add(new Level(WEAK_INDEX));
            } else if (i == 6) {
                items.add(new Level(STRONG_INDEX));
            }
            items.add(new Level(i));
        }

        final ComboBox<Level> comboBox = new ComboBox<Level>(items) {
            protected javafx.scene.control.Skin<?> createDefaultSkin() {
                return new ComboBoxListViewSkin<Level>(this) {
                    @Override
                    protected boolean isHideOnClickEnabled() {
                        return false;
                    }
                };
            }
        };
        comboBox.setPrefWidth(150);
        comboBox.setItems(items);
        comboBox.setCellFactory(new Callback<ListView<Level>, ListCell<Level>>() {
            @Override
            public ListCell<Level> call(ListView<Level> param) {
                return new ListCell<Level>() {
                    private CheckBox cb = new CheckBox();
                    private BooleanProperty booleanProperty;

                    {
                        cb.setOnAction(e->getListView().getSelectionModel().select(getItem()));
                    }
                    @Override
                    protected void updateItem(Level item, boolean empty) {
                        super.updateItem(item, empty);
                        if (!empty) {
                            if (item.getLevel() == WEAK_INDEX || item.getLevel() == STRONG_INDEX) {
                                Label lbl = new Label(item.getLevel() == WEAK_INDEX ? "Weak" : "Strong");
                                lbl.setStyle("-fx-font-size:14px;-fx-font-weight:bold;");
                                setGraphic(lbl);
                                setText(null);
                            } else {
                                if (booleanProperty != null) {
                                    cb.selectedProperty().unbindBidirectional(booleanProperty);
                                }
                                booleanProperty = item.selectedProperty();
                                cb.selectedProperty().bindBidirectional(booleanProperty);
                                setGraphic(cb);
                                setText(item.getLevel() + "");
                            }
                        } else {
                            setGraphic(null);
                            setText(null);
                        }
                    }
                };
            }
        });

        comboBox.setButtonCell(new ListCell<Level>() {
            @Override
            protected void updateItem(Level item, boolean empty) {
                super.updateItem(item, empty);
                String selected = comboBox.getItems().stream().filter(i -> i.isSelected())
                        .map(i -> i.getLevel()).sorted()
                        .map(i -> i + "").collect(Collectors.joining(","));
                setText(selected);
            }
        });

        Text txt = new Text();
        Button show = new Button("Show Selected");
        show.setOnAction(e->{
            StringBuilder sb = new StringBuilder();
            comboBox.getItems().stream().filter(Level::isSelected).forEach(item->{
                sb.append(item.getLevel()).append("\n");
            });
            txt.setText(sb.toString());
        });

        root.getChildren().addAll(comboBox,show,txt);
    }

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

    class Level {
        private IntegerProperty level = new SimpleIntegerProperty();
        private BooleanProperty selected = new SimpleBooleanProperty();

        public Level(int level) {
            setLevel(level);
        }

        public int getLevel() {
            return level.get();
        }

        public IntegerProperty levelProperty() {
            return level;
        }

        public void setLevel(int level) {
            this.level.set(level);
        }

        public boolean isSelected() {
            return selected.get();
        }

        public BooleanProperty selectedProperty() {
            return selected;
        }

        public void setSelected(boolean selected) {
            this.selected.set(selected);
        }
    }
}

Answer 2

我将使用ListCell修改ComboBox中的文本：

cbox1.getSelectionModel().selectedItemProperty().addListener((ObservableValue< ? extends String> observable, String oldValue, String newValue) -> {
        ListCell<String> lc = new ListCell<>();
        if (Integer.valueOf(newValue) < 10) {
            lc.setText("Weak (" + newValue + ")");
        } else if (Integer.valueOf(newValue) < 21) {
            lc.setText("Strong (" + newValue + ")");
        } else {
            lc.setText("");
        }
        cbox1.setButtonCell(lc);
    });

对于您的另一个问题，方法的多个选项可以选中和取消选中复选框。最简单的方法是将CheckBoxes添加到Array并循环。根据特定需求，还有许多其他方法可以实现此目的。如果您添加更多详细信息，我可能会尝试提供帮助。

复选框和组合框javaFX

2 个答案: