[英]JavaFx - Set two 'setOnAction' to the same button
我从另一个类获取EventHandler,我想将此EventHandler和其他ActionEvent设置为相同的按钮。 有可能的?
代码如下。 按钮是:“btnAdd”。
public void addActionListener(EventHandler<ActionEvent> eventHandlerSetNotSave){
btnAdd.setOnAction((e)-> {
FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open Resource File");
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("pictures file format",
"*.TIF","*.JPG","*.PNG","*.GIF","*.JEPG");
fileChooser.getExtensionFilters().addAll(extFilter);
File file = fileChooser.showOpenDialog(null);
if (file != null &&
url.equals(emptyImageUrl)? true:alertMessageWarning("The viseme will change, and previous viseme will be delete.")) {
setImage("file:"+file.toString());
changeAfterSaved=false;
}
});
btnAdd.setOnAction(eventHandlerSetNotSave);
btnDelete.setOnAction((e)-> {
changeAfterSaved=true;
setImage(emptyImageUrl);
});
}
调用addEventHandler()
方法而不是setOnAction(...)
:
btnAdd.addEventHandler(ActionEvent.ACTION, (e)-> {
FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open Resource File");
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("pictures file format",
"*.TIF","*.JPG","*.PNG","*.GIF","*.JEPG");
fileChooser.getExtensionFilters().addAll(extFilter);
File file = fileChooser.showOpenDialog(null);
if (file != null &&
url.equals(emptyImageUrl)? true:alertMessageWarning("The viseme will change, and previous viseme will be delete.")) {
setImage("file:"+file.toString());
changeAfterSaved=false;
}
});
btnAdd.addEventHandler(ActionEvent.ACTION, eventHandlerSetNotSave);
我不知道你可以用JavaFX开箱即用,但有一个简单的解决方法。 您可以创建一个简单的类来将事件转发到多个处理程序,如下所示:
public class MultipleEventHandler<T extends Event> implements
EventHandler<T> {
private Collection<EventHandler<T>> handler;
public MultipleEventHandler(Collection<EventHandler<T>> handler) {
this.handler = handler;
}
@Override
public void handle(T event) {
handler.forEach(h -> h.handle(event));
}
}
然后,您可以将所有事件处理程序传递给构造函数,并将此类用作事件处理程序。
MultipleEventHandler<ActionEvent> handler = new MultipleEventHandler<>(asList(e, eventHandlerSetNotSave));
btnAdd.setOnAction(handler);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.