JavaFx – 将两个’setOnAction’设置为相同的按钮

发布时间：2020-12-15 04:27:03 所属栏目：Java 来源：网络整理

导读：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(EventHandlerActionEvent eventHandlerSetNotSave){ btnAdd.setOnAction((e)- { FileChoose

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);
    });
}

解决方法

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","*.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);

（编辑：李大同）

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