我在JavaFX2.2中使用了tableView。我有一个列，其中保存了当用户单击按钮时更新的值。这些值是动态填充的，直到这部分工作正常。但是，当我向下滚动表格以查看表格中的其他值时，单元格数据会发生变化。你能建议我需要做些什么来解决这个问题吗？
这是我正在动态填充的表单元格的代码，并且在向下滚动表时会发生更改。
Callback<TableColumn, TableCell> cellFactoryField = new Callback<TableColumn, TableCell>() {
@Override
public TableCell call(final TableColumn param) {
final Button button = new Button("Select Field");
final TableCell cell = new TableCell() {
@Override
public void updateItem(Object item, boolean empty) {
super.updateItem(item, empty);
// label.setText("Here");
if (empty) {
// System.out.println("table cell inside updateitem = "+item);
// setGraphic(null);
}
else
{
}
}
};
button.setOnAction(new EventHandler<ActionEvent>() {
private CheckBoxTreeItem<String> checkBoxTreeItem;
private CheckBoxTreeItem<String> nodeFieldName;
private CheckBoxTreeItem<String> nodeFieldName2;
private CheckBoxTreeItem<String> nodeFieldName3;
private Stage stage = new Stage();
@Override public void handle(ActionEvent e)
{
CheckBoxTreeItem<String> rootItem =
new CheckBoxTreeItem<String>("Tables");
rootItem.setExpanded(true);
final TreeView tree = new TreeView(rootItem);
tree.setEditable(true);
tree.setCellFactory(CheckBoxTreeCell.<String>forTreeView());
{
checkBoxTreeItem = new CheckBoxTreeItem<String>("Sample Table" );//+ (i+1));
rootItem.getChildren().add(checkBoxTreeItem);
nodeFieldName = new CheckBoxTreeItem<String>("Field Name1");
nodeFieldName2 = new CheckBoxTreeItem<String>("Field Name2");
nodeFieldName3 = new CheckBoxTreeItem<String>("Field Name3");
checkBoxTreeItem.getChildren().addAll(nodeFieldName, nodeFieldName2, nodeFieldName3);
}
tree.setRoot(rootItem);
tree.setShowRoot(true);
StackPane root = new StackPane();
root.getChildren().add(tree);
Button selectButton = new Button("Select");
HBox hbox = new HBox();
hbox.getChildren().add(selectButton);
hbox.setAlignment(Pos.CENTER);
selectButton.setOnAction(new EventHandler<ActionEvent>(){
@Override
public void handle(ActionEvent t) {
final ArrayList<String> selectedValues = new ArrayList<String>();
// System.out.println("Selected tree items are : ");
if(checkBoxTreeItem.isSelected())
selectedValues.add(checkBoxTreeItem.getValue());
if(nodeFieldName.isSelected())
selectedValues.add(nodeFieldName.getValue());
if(nodeFieldName2.isSelected())
selectedValues.add(nodeFieldName2.getValue());
if(nodeFieldName3.isSelected())
selectedValues.add(nodeFieldName3.getValue());
stage.hide();
for(int i = 0; i<selectedValues.size();i++)
{
if(i == selectedValues.size()-1)
selectedVals += selectedValues.get(i);
else
selectedVals += selectedValues.get(i)+",";
}
fieldNameChosen = true;
if(fieldNameChosen)
cell.setGraphic(new Label(selectedVals));
else
cell.setGraphic(button);
}
});
BorderPane borderPane = new BorderPane();
borderPane.setCenter(root);
borderPane.setBottom(hbox);
stage.setScene(new Scene(new Group(borderPane)));
stage.show();
}
});
if(!(cell.getGraphic() instanceof Label))
cell.setGraphic(button);
return cell;
}
};
fieldName.setCellFactory(cellFactoryField);
对于另一个字段，我遇到了类似的问题，需要动态显示另一个表中的值。下面是我使用过的代码。
final int k = 0;
value.setCellValueFactory(new Callback<CellDataFeatures<ObservableList, String>, ObservableValue<String>>() {
int noOfDataCells = k;
public ObservableValue<String> call(CellDataFeatures<ObservableList, String> param)
{
TableColumn column = param.getTableColumn();
int size = 0;
if(tableView1.getItems()!=null)
size = ((ObservableList) tableView1.getItems().get(0)).size();
String valueFromData = "";
if(noOfDataCells<size)
{
valueFromData = String.valueOf(((ObservableList) tableView1.getItems().get(0)).get(noOfDataCells));
}
else if(noOfDataCells == size)
{
noOfDataCells = 0;
valueFromData = String.valueOf(((ObservableList) tableView1.getItems().get(0)).get(noOfDataCells));
}
else if (noOfDataCells>size)
{
valueFromData = "";
}
noOfDataCells++;
//TODO SET THE VALUE IN THE MODEL
//（（MetaTag）列.getTableView（）.getItems（）.get(//.getIndex（）））.setFieldName（selectedVals）；
return new SimpleStringProperty(valueFromData);
}
});
下一个问题是：
- 您正在使用表编辑功能，而没有实现所需的API
- 您更新工厂中的单元格，但不更新备份表的数据
- 单元格在向外滚动时被销毁（出于性能原因），然后重新创建回来，因此您的所有更改都将被销毁
请参阅下一个关于TableView编辑正确方法的教程：http://docs.oracle.com/javafx/2/ui_controls/table-view.htm
我还创建了一个小程序，它使用TreeCheckBox阶段通过双击单元格来更新Table。我在最重要的地方做了标记。
public class TableCellEditing extends Application {
private void init(Stage primaryStage) {
StackPane root = new StackPane();
primaryStage.setScene(new Scene(root, 400, 200));
// you didn't provided data which your Tables use so example will work with Person class
final ObservableList<Person> data = FXCollections.observableArrayList(
new Person("click to edit", "Smith"),
new Person("", "Johnson"),
new Person("", "Williams1"),
new Person("", "Williams2"),
new Person("", "Williams3"),
new Person("", "Williams4"),
new Person("", "Williams5"),
new Person("", "Jones"),
new Person("", "Brown"),
new Person("", "Brown2"));
TableView tableView = new TableView();
tableView.setItems(data);
// make table editable
tableView.setEditable(true);
TableColumn lastNameCol = new TableColumn();
lastNameCol.setText("Last");
lastNameCol.setCellValueFactory(new PropertyValueFactory("lastName"));
TableColumn firstNameCol = new TableColumn();
firstNameCol.setText("First");
// here you connect data list with table column
firstNameCol.setCellValueFactory(new PropertyValueFactory("firstName"));
// here you specify that your cells are special and provide editing hooks
firstNameCol.setCellFactory(new Callback<TableColumn, TableCell>() {
@Override
public TableCell call(final TableColumn param) {
final TableCell cell = new TableCell() {
@Override
// this method is called on editable tables by double click
public void startEdit() {
super.startEdit();
// here we create new Stage to select items from tree
new CheckBoxTreeStage(this).show();
}
@Override
public void updateItem(Object item, boolean empty) {
super.updateItem(item, empty);
if (empty) {
setText(null);
} else {
if (isEditing()) {
setText(null);
} else {
// this is the place where we update data by chosen value
setText(getItem().toString());
setGraphic(null);
}
}
}
};
return cell;
}
});
tableView.getColumns().addAll(firstNameCol, lastNameCol);
tableView.setFocusTraversable(false);
root.getChildren().add(tableView);
}
// I've extracted your stage to a separate class for better readability
private static class CheckBoxTreeStage extends Stage {
private CheckBoxTreeItem<String> checkBoxTreeItem;
private CheckBoxTreeItem<String> nodeFieldName;
private CheckBoxTreeItem<String> nodeFieldName2;
private CheckBoxTreeItem<String> nodeFieldName3;
public CheckBoxTreeStage(final TableCell cell) {
CheckBoxTreeItem<String> rootItem =
new CheckBoxTreeItem<String>("Tables");
rootItem.setExpanded(true);
final TreeView tree = new TreeView(rootItem);
tree.setEditable(true);
tree.setCellFactory(CheckBoxTreeCell.<String>forTreeView());
{
checkBoxTreeItem = new CheckBoxTreeItem<String>("Sample Table");//+ (i+1));
rootItem.getChildren().add(checkBoxTreeItem);
nodeFieldName = new CheckBoxTreeItem<String>("Field Name1");
nodeFieldName2 = new CheckBoxTreeItem<String>("Field Name2");
nodeFieldName3 = new CheckBoxTreeItem<String>("Field Name3");
checkBoxTreeItem.getChildren().addAll(nodeFieldName, nodeFieldName2, nodeFieldName3);
}
tree.setRoot(rootItem);
tree.setShowRoot(true);
StackPane root = new StackPane();
root.getChildren().add(tree);
Button selectButton = new Button("Select");
HBox hbox = new HBox();
hbox.getChildren().add(selectButton);
hbox.setAlignment(Pos.CENTER);
selectButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent t) {
final ArrayList<String> selectedValues = new ArrayList<String>();
// System.out.println("Selected tree items are : ");
if (checkBoxTreeItem.isSelected()) {
selectedValues.add(checkBoxTreeItem.getValue());
}
if (nodeFieldName.isSelected()) {
selectedValues.add(nodeFieldName.getValue());
}
if (nodeFieldName2.isSelected()) {
selectedValues.add(nodeFieldName2.getValue());
}
if (nodeFieldName3.isSelected()) {
selectedValues.add(nodeFieldName3.getValue());
}
hide();
String selectedVals = "";
for (int i = 0; i < selectedValues.size(); i++) {
if (i == selectedValues.size() - 1) {
selectedVals += selectedValues.get(i);
} else {
selectedVals += selectedValues.get(i) + ",";
}
}
boolean fieldNameChosen = true;
if (fieldNameChosen) {
cell.commitEdit(selectedVals);
} else {
cell.cancelEdit();
}
}
});
BorderPane borderPane = new BorderPane();
borderPane.setCenter(root);
borderPane.setBottom(hbox);
setScene(new Scene(new Group(borderPane)));
}
};
public static class Person {
private StringProperty firstName;
private StringProperty lastName;
private Person(String fName, String lName) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
}
public StringProperty firstNameProperty() {
return firstName;
}
public StringProperty lastNameProperty() {
return lastName;
}
}
@Override
public void start(Stage primaryStage) throws Exception {
init(primaryStage);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}