ComboBoxTableCellComboBox允許在編輯模式下添加一個TableCell。如果comboBox.show()被調(diào)用（例如顯示彈出窗口），comboBox則按預(yù)期按下箭頭鍵和向上箭頭鍵時會做出反應(yīng)，并在按下回車鍵后立即結(jié)束編輯模式。我只想使用鍵盤控制編輯。我找不到使用鍵盤調(diào)用“comboBox.show()”的方法。到現(xiàn)在為止，我嘗試使用setOnKeyPressed向ComboBoxTableCell（在通過工廠方法創(chuàng)建期間）或ComboBox（通過使用ComboBoxTableCell.getGraphic()）添加回調(diào)。調(diào)用回調(diào)ComboBox.show()以打開彈出窗口，但未調(diào)用它們（通過System.out回調(diào)中的打印驗證）。actColumn.setCellFactory( new Callback<TableColumn<S,Object>, TableCell<S,Object>>() { private ObservableList<Object> list=optionList; @SuppressWarnings("unchecked") @Override public TableCell<S, Object> call(TableColumn<S, Object> param) { final ComboBoxTableCell<S,Object> cell= new ComboBoxTableCell<S,Object>(list); cell.setConverter((StringConverter<Object>) converter); cell.setOnKeyPressed(event -> { cell.startEdit(); Node node=cell.getGraphic(); System.out.println(node); if(node instanceof ComboBox) { System.out.println("Hit Key."); final ComboBox<?> box=(ComboBox<?>) node; box.show(); } });除了這段代碼很奇怪之外，當(dāng)在單元格的編輯模式下按下一個鍵時，處理程序不會被調(diào)用（或者至少我沒有輸出）。我希望能夠選擇一個ComboBoxTableCell，按回車鍵（可能還有一個額外的鍵），然后內(nèi)部的彈出窗口ComboBox應(yīng)該顯示出來，而無需鼠標(biāo)進(jìn)行任何交互。
1 回答
MYYA
TA貢獻(xiàn)1868條經(jīng)驗 獲得超4個贊
您可以子類化ComboBoxTableCell以添加您想要的行為。這是一個概念驗證：
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.ComboBoxTableCell;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.util.StringConverter;
public class AutoShowComboBoxTableCell<S, T> extends ComboBoxTableCell<S, T> {
/*
* May want to provide alternate constructors and static methods similar to
* the ComboBoxTableCell class (i.e. the superclass).
*/
private boolean enterPressed;
public AutoShowComboBoxTableCell(StringConverter<T> converter, ObservableList<T> values) {
super(converter, values);
getStyleClass().add("auto-show-combo-box-table-cell");
// Assumes TableView property is set only once (valid assumption?)
tableViewProperty().addListener(new InvalidationListener() {
@Override
public void invalidated(Observable observable) {
// Need to know if editing was started by the user pressing
// the ENTER key (see #startEdit())
EventHandler<KeyEvent> filter = event -> {
if (event.getCode() == KeyCode.ENTER) {
enterPressed = event.getEventType() == KeyEvent.KEY_PRESSED;
}
};
// Possible memory leak? Consider using WeakEventHandler (read docs)
getTableView().addEventFilter(KeyEvent.KEY_PRESSED, filter);
getTableView().addEventFilter(KeyEvent.KEY_RELEASED, filter);
observable.removeListener(this);
}
});
}
@Override
public void startEdit() {
if (isEditing()) return;
super.startEdit();
if (isEditing()) {
if (enterPressed) {
// Cell was put into edit mode by the user pressing ENTER. This causes
// problems since *releasing* ENTER while the ComboBox has the focus
// results in the value being committed; this leads to the current value
// being committed *immediately* after entering edit mode—not what we want.
// To fix that we consume the first ENTER-released event and then let all
// subsequent events through (by removing the event filter).
addEventFilter(KeyEvent.KEY_RELEASED, new EventHandler<>() {
@Override public void handle(KeyEvent event) {
if (event.getCode() == KeyCode.ENTER) {
event.consume();
removeEventFilter(KeyEvent.KEY_RELEASED, this);
}
}
});
}
ComboBox<?> comboBox = (ComboBox<?>) getGraphic();
comboBox.requestFocus(); // Needed to allow releasing ENTER to commit the value
comboBox.show();
}
}
@Override
public void cancelEdit() {
if (isEditing()) {
super.cancelEdit();
requestTableViewFocus();
}
}
@Override
public void commitEdit(T newValue) {
if (isEditing()) {
super.commitEdit(newValue);
requestTableViewFocus();
}
}
// Allows user to keep navigating the table via the keyboard
private void requestTableViewFocus() {
TableView<S> tableView = getTableView();
if (tableView != null) {
tableView.requestFocus();
}
}
}
注意：以上使用了實現(xiàn)細(xì)節(jié)的知識，圖形設(shè)置為編輯開始時的事實ComboBox以及導(dǎo)致提交編輯的原因。實施細(xì)節(jié)可能會更改，恕不另行通知。
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