如果 ChangeListener 检测到更改，则更改 ComboBox 样式

Question

我继承了一些代码，我试图通过根据检测到的 ComboBox 值更改更改 ComboBox 的边框颜色来扩展这些代码。但是，似乎对 ComboBox 样式所做的任何更改都不会使其超出 ChangeListener lambda。

基本上，ComboBox 边框初始化为黑色，我想在用户更改值后更改为颜色，但 ChangeListener 中设置的颜色没有得到应用。当我单步执行代码时，我看到 lambda ChangeListener 中的样式字符串发生了变化，但是当我退出 lambda ChangeListener 时它又回到了初始样式字符串。

我在下面包含了我正在修改的代码，以及我试图添加的代码，设置了 ComboBox 样式的插入和调出。任何帮助将不胜感激。

public class SearchScreenController 
{
    @FXML
    private TableView<ConfigBaselineFileArtifact> searchRecordsTable;
    @FXML 
    private TableColumn<ConfigBaselineFileArtifact, String> categoryColumn = new TableColumn<>("File Category");
    @FXML 
    private TableColumn<ConfigBaselineFileArtifact, ConfigBaselineFileArtifact> subcategoryColumn = new TableColumn<>("File Subcategory")

    private void createSearchTable() 
    {
        searchRecordsTable.getColumns().clear();

        //File Category and Subcategory Columns
        categoryColumn.setCellValueFactory(new PropertyValueFactory<>("fileCategoryName"));
        subcategoryColumn.setCellValueFactory(value -> new SimpleObjectProperty(value.getValue()));

        categoryColumn.setCellFactory(param -> new TableCell<ConfigBaselineFileArtifact, String>() {
                @Override
                protected void updateItem(String item, boolean empty) {
                    super.updateItem(item, empty);
                    if (!empty) {
                        ComboBox<String> cb = new ComboBox<String>(FXCollections.observableArrayList(categoryList));
                        cb.setValue(item);
                        cb.setPrefWidth(145);
                        cb.setStyle("-fx-background-color: transparent; -fx-border-color: black;");

                        cb.getSelectionModel().selectedItemProperty().addListener((ChangeListener<String>) (observable, oldValue, newValue) -> {
                            if (newValue != null) {
                                int index = getIndex();
                                // Test for case that updated combobox isn't listed with list of selected records
                                if (!searchRecordsTable.getSelectionModel().getSelectedIndices().contains(index)) {
                                    searchRecordsTable.getItems().get(index).setFileCategoryName(newValue);
                                    searchRecordsTable.getItems().get(index).setFileSubCategoryName("");
                                    DataStore.getInstance().saveConfigBaselineFileArtifact(searchRecordsTable.getItems().get(index));
                                } else {
                                    // Else if updated combobox IS within list of selected records
                                    searchRecordsTable.getSelectionModel().getSelectedItems().forEach(record -> {
                                        record.setFileCategoryName(newValue);
                                        record.setFileSubCategoryName("");
                                        DataStore.getInstance().saveConfigBaselineFileArtifact(record);
                                    });
                                }

                                // Code I'm trying to add is below
                                if (newValue.equals("")) {
                                    cb.setStyle("-fx-background-color: transparent; -fx-border-color: red;");
                                } else {
                                    cb.setStyle("-fx-background-color: transparent; -fx-border-color: green;");
                                // Code I'm trying to add is above

                                searchRecordsTable.refresh();                                    
                            }
                        });
                        setGraphic(cb);
                    }
                }
            });
        searchRecordsTable.getColumns().addAll(checkBoxColumn, fileNameColumn, artifactNameColumn, categoryColumn, subcategoryColumn, sensorNameColumn, subsystemColumn, componentColumn, dateImportedColumn, importedByColumn, labelsColumn);
        searchRecordsTable.refresh();
        searchRecordsTable.setEditable(true);
        searchRecordsTable.getSelectionModel().getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
    }
}

Answer 1

我认为问题在于，您的 searchRecordsTable.refresh(); 调用正在重置边框。好像又调用了updateItem(String item, boolean empty)函数。您需要确保将状态存储在其他任何地方，例如一个哈希图。像这样：

private Map<String, Boolean> changeMap = new HashMap<>();
//in your selectedItem listener
if (newValue.equals("")) {
    changeMap.remove(item);
} else {
    changeMap.put(item, true);
}
//before setGraphic(cb)
if(changeMap.contains(item)) {
    cb.setStyle("-fx-background-color: transparent; -fx-border-color: green;");
}

如果 ChangeListener 检测到更改，则更改 ComboBox 样式

Change ComboBox style if ChangeListener detects change

java

javafx

combobox

changelistener