问题
处理表时最基本的需求之一是复制/粘贴表格单元格的数据。 JavaFX TableView不支持开箱即用。
问题
如何访问表格单元格而不是数据对象，以便将剪贴板数据粘贴到选定的单元格中？
代码
这是我到目前为止所得到的：
TableUtils.java
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.control.TablePosition;
import javafx.scene.control.TableView;
import javafx.scene.input.Clipboard;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyCodeCombination;
import javafx.scene.input.KeyCombination;
import javafx.scene.input.KeyEvent;
public class TableUtils {
/**
* Install the keyboard handler:
* + CTRL + C = copy to clipboard
* + CTRL + V = paste to clipboard
* @param table
*/
public static void installCopyPasteHandler(TableView<?> table) {
// install copy/paste keyboard handler
table.setOnKeyPressed(new TableKeyEventHandler());
}
/**
* Copy/Paste keyboard event handler.
* The handler uses the keyEvent's source for the clipboard data. The source must be of type TableView.
*/
public static class TableKeyEventHandler implements EventHandler<KeyEvent> {
KeyCodeCombination copyKeyCodeCompination = new KeyCodeCombination(KeyCode.C, KeyCombination.CONTROL_ANY);
KeyCodeCombination pasteKeyCodeCompination = new KeyCodeCombination(KeyCode.V, KeyCombination.CONTROL_ANY);
public void handle(final KeyEvent keyEvent) {
if (copyKeyCodeCompination.match(keyEvent)) {
if( keyEvent.getSource() instanceof TableView) {
// copy to clipboard
copySelectionToClipboard( (TableView<?>) keyEvent.getSource());
// event is handled, consume it
keyEvent.consume();
}
}
else if (pasteKeyCodeCompination.match(keyEvent)) {
if( keyEvent.getSource() instanceof TableView) {
// copy to clipboard
pasteClipboard( (TableView<?>) keyEvent.getSource());
// event is handled, consume it
keyEvent.consume();
}
}
}
}
/**
* Get table selection and copy it to the clipboard.
* @param table
*/
public static void copySelectionToClipboard(TableView<?> table) {
StringBuilder clipboardString = new StringBuilder();
ObservableList<TablePosition> positionList = table.getSelectionModel().getSelectedCells();
int prevRow = -1;
for (TablePosition position : positionList) {
int row = position.getRow();
int col = position.getColumn();
Object cell = (Object) table.getColumns().get(col).getCellData(row);
// null-check: provide empty string for nulls
if (cell == null) {
cell = "";
}
// determine whether we advance in a row (tab) or a column
// (newline).
if (prevRow == row) {
clipboardString.append('\t');
} else if (prevRow != -1) {
clipboardString.append('\n');
}
// create string from cell
String text = cell.toString();
// add new item to clipboard
clipboardString.append(text);
// remember previous
prevRow = row;
}
// create clipboard content
final ClipboardContent clipboardContent = new ClipboardContent();
clipboardContent.putString(clipboardString.toString());
// set clipboard content
Clipboard.getSystemClipboard().setContent(clipboardContent);
System.out.println( "Clipboard string: " + clipboardContent);
}
public static void pasteClipboard(TableView<?> table) {
TablePosition focusedCellPosition = table.getFocusModel().getFocusedCell();
System.out.println("Pasting into cells starting at " + focusedCellPosition);
String pasteString = Clipboard.getSystemClipboard().getString();
System.out.println(pasteString);
Pattern pattern = Pattern.compile("([^\t]*)\t([^\t]*)\t([^\n]*)(\n)?");
Matcher matcher = pattern.matcher(pasteString);
while (matcher.find()) {
System.out.println(matcher.group(1) + "," + matcher.group(2) + "," + matcher.group(3));
// TODO: what now? how to paste the data?
}
}
}
TableCopyCellsDemo.java
import javafx.application.Application;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class TableCopyCellsDemo extends Application {
private final ObservableList<Person> data = FXCollections.observableArrayList(new Person("Jacob", "Smith", 18), new Person("Isabella", "Johnson", 19), new Person("Ethan", "Williams", 20), new Person("Michael", "Brown", 21));
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
stage.setWidth(500);
stage.setHeight(550);
// create table columns
TableColumn<Person, String> firstNameCol = new TableColumn<Person, String>("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
TableColumn<Person, String> lastNameCol = new TableColumn<Person, String>("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));
TableColumn<Person, Integer> ageCol = new TableColumn<Person, Integer>("Age");
ageCol.setMinWidth(60);
ageCol.setCellValueFactory(new PropertyValueFactory<Person, Integer>("age"));
TableView<Person> table = new TableView<>();
table.setPlaceholder(new Text("No content in table"));
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol, ageCol);
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 10, 10, 10));
BorderPane borderPane = new BorderPane();
borderPane.setCenter(table);
vbox.getChildren().addAll(borderPane);
vbox.getChildren().add( new Label( "Select cells and press CTRL+C. Paste the data into Excel or Notepad"));
Scene scene = new Scene(vbox);
stage.setScene(scene);
stage.show();
// enable multi-selection
table.getSelectionModel().setCellSelectionEnabled(true);
table.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
// enable copy/paste
TableUtils.installCopyPasteHandler(table);
}
public static class Person {
private final StringProperty firstName;
private final StringProperty lastName;
private final IntegerProperty age;
private Person(String fName, String lName, Integer age) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.age = new SimpleIntegerProperty(age);
}
public final StringProperty firstNameProperty() {
return this.firstName;
}
public final java.lang.String getFirstName() {
return this.firstNameProperty().get();
}
public final void setFirstName(final java.lang.String firstName) {
this.firstNameProperty().set(firstName);
}
public final StringProperty lastNameProperty() {
return this.lastName;
}
public final java.lang.String getLastName() {
return this.lastNameProperty().get();
}
public final void setLastName(final java.lang.String lastName) {
this.lastNameProperty().set(lastName);
}
public final IntegerProperty ageProperty() {
return this.age;
}
public final int getAge() {
return this.ageProperty().get();
}
public final void setAge(final int age) {
this.ageProperty().set(age);
}
}
}
问题是pasteClipboard方法中的 TODO 。您可以通过 CTRL + C 将所选单元格的数据复制到剪贴板。使用 CTRL + V ，您可以从剪贴板获取数据并进行分析。但我还没有找到将数据直接写入表格的手段。
非常感谢！
答案 0 :(得分：4)
经过一些挖掘和阅读有关反射的解决方案后，我发现自己比我想象的要容易。最重要的是：没有反思。
我以为我会分享这些代码，希望它对别人有帮助。
这是修改单元格的基本方法。这正是我发现的。如果有人知道更好的方法，请分享。
// get cell
TableColumn tableColumn = table.getColumns().get(colIndex);
ObservableValue observableValue = tableColumn.getCellObservableValue(rowIndex);
if( observableValue instanceof StringProperty) {
((StringProperty) observableValue).set(clipboardCellContent);
}
因此粘贴方法基本上如下所示：
public static void pasteClipboard( TableView<?> table) {
// abort if there's not cell selected to start with
if( table.getSelectionModel().getSelectedCells().size() == 0) {
return;
}
// get the cell position to start with
TablePosition pasteCellPosition = table.getSelectionModel().getSelectedCells().get(0);
System.out.println("Pasting into cell " + pasteCellPosition);
String pasteString = Clipboard.getSystemClipboard().getString();
System.out.println(pasteString);
int rowClipboard = -1;
StringTokenizer rowTokenizer = new StringTokenizer( pasteString, "\n");
while( rowTokenizer.hasMoreTokens()) {
rowClipboard++;
String rowString = rowTokenizer.nextToken();
StringTokenizer columnTokenizer = new StringTokenizer( rowString, "\t");
int colClipboard = -1;
while( columnTokenizer.hasMoreTokens()) {
colClipboard++;
// calculate the position in the table cell
int rowTable = pasteCellPosition.getRow() + rowClipboard;
int colTable = pasteCellPosition.getColumn() + colClipboard;
// skip if we reached the end of the table
if( rowTable >= table.getItems().size()) {
continue;
}
if( colTable >= table.getColumns().size()) {
continue;
}
String clipboardCellContent = columnTokenizer.nextToken();
// System.out.println( rowClipboard + "/" + colClipboard + ": " + cell);
// get cell
TableColumn tableColumn = table.getColumns().get(colTable);
ObservableValue observableValue = tableColumn.getCellObservableValue(rowTable);
System.out.println( rowTable + "/" + colTable + ": " +observableValue);
// TODO: handle double, etc
if( observableValue instanceof StringProperty) {
((StringProperty) observableValue).set(clipboardCellContent);
}
else if( observableValue instanceof IntegerProperty) {
int value;
try {
value = NumberFormat.getInstance().parse(clipboardCellContent).intValue();
((IntegerProperty) observableValue).set(value);
} catch (ParseException e) {
e.printStackTrace();
}
}
}
}
}
您可以在this gist上获取完整的代码。