我需要一个可以自动换行、添加滚动条等的控件 - 但忽略回车键并使用 tab/shift 选项卡跳转到下一个控件。我似乎无法弄清楚这一点。
这是我做的控件,看起来只是简单的停留在文本区域。 (这是从网上的一个旧示例中使用的,似乎只有当 textArea 与其余部分位于同一节点中时它才有效)。
public class TabAndEnterIgnoringTextArea extends TextArea {
final TextArea myTextArea = this;
public TabAndEnterIgnoringTextArea() {
this.setWrapText(true);
addEventFilter(KeyEvent.KEY_PRESSED, new TabAndEnterHandler());
}
private class TabAndEnterHandler implements EventHandler<KeyEvent> {
private KeyEvent recodedEvent;
@Override
public void handle(KeyEvent event) {
if (recodedEvent != null) {
recodedEvent = null;
return;
}
Parent parent = getParent();
if (parent != null) {
switch (event.getCode()) {
case ENTER:
if (event.isControlDown()) {
recodedEvent = recodeWithoutControlDown(event);
myTextArea.fireEvent(recodedEvent);
} else {
Event parentEvent = event.copyFor(parent, parent);
myTextArea.getParent().fireEvent(parentEvent);
}
event.consume();
break;
case TAB:
if (event.isControlDown()) {
recodedEvent = recodeWithoutControlDown(event);
myTextArea.fireEvent(recodedEvent);
} else if (event.isShiftDown()) {
ObservableList<Node> children = FXCollections.observableArrayList();
addAllDescendents(parent, children);
int idx = children.indexOf(myTextArea);
if (idx > 0) {
for (int i = idx - 1; i > 0; i--) {
if (children.get(i).isFocusTraversable()) {
children.get(i).requestFocus();
break;
}
}
}
} else {
ObservableList<Node> children = FXCollections.observableArrayList();
addAllDescendents(parent, children);
int idx = children.indexOf(myTextArea);
if (idx >= 0) {
for (int i = idx + 1; i < children.size(); i++) {
if (children.get(i).isFocusTraversable()) {
children.get(i).requestFocus();
break;
}
}
if (idx + 1 >= children.size()) {
for (int i = 0; i < idx; i++) {
if (children.get(i).isFocusTraversable()) {
children.get(i).requestFocus();
break;
}
}
}
}
}
event.consume();
break;
default:
break;
}
}
}
private void addAllDescendents(Parent parent, ObservableList<Node> nodes) {
for (Node node : parent.getChildrenUnmodifiable()) {
nodes.add(node);
if (node instanceof Parent)
addAllDescendents((Parent) node, nodes);
}
}
private KeyEvent recodeWithoutControlDown(KeyEvent event) {
return new KeyEvent(event.getEventType(), event.getCharacter(), event.getText(), event.getCode(),
event.isShiftDown(), false, event.isAltDown(), event.isMetaDown());
}
}
一旦我进入我的领域,它就不会随着键盘离开。有任何想法吗?另外 - 我不应该假设下一个控件实际上位于我的父级内的节点中,因为该控件可能是另一个控件的一部分,其中最后一个控件和下一个控件可能位于上面的父级上。
基本上我想要场景图中的下一个可着陆项目。
我可以使用内部 API 来做到这一点 - 但我知道这是非常令人沮丧的。
public class TabAndEnterIgnoringTextArea extends TextArea {
final TextArea myTextArea = this;
public TabAndEnterIgnoringTextArea() {
addEventFilter(KeyEvent.KEY_PRESSED, new TabAndEnterHandler());
}
class TabAndEnterHandler implements EventHandler<KeyEvent> {
private KeyEvent recodedEvent;
@Override
public void handle(KeyEvent event) {
if (recodedEvent != null) {
recodedEvent = null;
return;
}
Parent parent = myTextArea.getParent();
Scene scene = parent.getScene();
while (scene == null){
parent = parent.getParent();
scene = parent.getScene();
}
SceneTraversalEngine engine = new SceneTraversalEngine(getScene());
if (parent != null) {
switch (event.getCode()) {
case ENTER:
if (event.isControlDown()) {
recodedEvent = recodeWithoutControlDown(event);
myTextArea.fireEvent(recodedEvent);
} else {
Event parentEvent = event.copyFor(parent, parent);
myTextArea.getParent().fireEvent(parentEvent);
}
event.consume();
break;
case TAB:
if(event.isShiftDown()){
engine.trav(myTextArea, Direction.PREVIOUS);
}else {
engine.trav(myTextArea, Direction.NEXT);
}
}
}
}
private KeyEvent recodeWithoutControlDown(KeyEvent event) {
return new KeyEvent(event.getEventType(), event.getCharacter(), event.getText(), event.getCode(),
event.isShiftDown(), false, event.isAltDown(), event.isMetaDown());
}
}
}
Thanks