当我上下滚动tableview时，Java FX 2.2 tableview数据发生变化 [英] Java FX 2.2 tableview data changes as I scroll up and down the tableview
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问题描述
我在JavaFX2.2中使用了tableView.我有一列，其中保存了当用户单击按钮时更新的值.这些值会动态填充，直到这部分工作正常为止.但是，当我向下滚动表格以查看表格中的其他值时，单元格数据会更改.您能否建议我需要做些什么才能解决此问题?
I have used a tableView in JavaFX2.2. I have a column where I have kept values which are updated when the user clicks on a button. These values are dynamically getting populated and till this part its working fine. However, when I scroll down the table to see the other values in the table, the cell data changes. Can you please suggest what I need to do to get this problem resolved?
这是我正在动态填充的表格单元格的代码，在向下滚动表格时会发生变化.
Here is the code for the table cell that I am dynamically populating and is getting changed on scrolling down the table.
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);
我在另一个字段中遇到了类似的问题，我需要动态显示另一个表中的值.以下是我使用的代码.
I am getting a similar problem for another field where I need to show values from another table dynamically. Below is the code I have used.
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)column.getTableView().getItems().get( //.getIndex())).setFieldName(selectedVals);
// ((MetaTag) column.getTableView().getItems().get( // .getIndex())).setFieldName(selectedVals);
return new SimpleStringProperty(valueFromData);
}
});
推荐答案
还有下一个问题:
- 您正在使用表编辑功能而未实现所需的API
- 您更新工厂中的单元格，但不更新 用来备份Table的数据
- 单元(由于性能原因)在滚动时会被销毁并重新创建，因此所有更改都将被销毁.
- You are using table editing functionality without implementing required API
- You update cells in your factory, but not a data by which Table is backed up by
- Cells are being destroyed on scroll out (for performance reason) and recreated back, so all your changes become destroyed.
请参阅有关TableView编辑正确方法的下一个教程: http://docs.oracle.com/javafx/2/ui_controls/table-view.htm
See next tutorial on correct approach to TableView editing: http://docs.oracle.com/javafx/2/ui_controls/table-view.htm
我还创建了一个小程序，该程序使用TreeCheckBox阶段通过双击单元格来更新Table.我已经在注释中标记了最重要的地方.
Also I've created a small program which uses your TreeCheckBox stage to update Table by double-click on cells. I've marked with comments most important places.
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);
}
}
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