那些遇到过的问题

JavaFX ComboBox setItems 触发 onAction 事件

Ale*_*lex 3 combobox javafx actionevent


我有一个 FXML 编辑器和一个控制器，它在树视图中选择时设置域对象。因此，每次在树视图中选择一个新对象时，控制器都会解除编辑器中所有控件与前一个对象的绑定，并绑定到新域对象的属性。这包括使用 setItems 从 ComboBox 中的域对象设置值。问题在于 setItems 会为项目列表中的每个项目触发 ComboBox 的 onAction 事件处理程序。据我了解， onAction 应该定义当用户从 ComboBox 中选择一个条目而不是在加载 ComboBox 时触发的代码？！
我可以通过使用鼠标释放事件或在 setItems 期间禁用 actionevent 的布尔信号量来解决这个问题。但是，由于我找不到其他人提出这个要求，我想知道是否有更普遍的问题，我最好向社区询问。
我在我的 OnAction 事件处理程序中创建了一个异常来打印堆栈跟踪 - 这帮助我理解我上面解释的内容。也许这个堆栈跟踪可以帮助您了解正在发生的事情/错误。第一行是在 FXML 中链接到 onActionEvent 的方法，堆栈跟踪中的最后一行是 ComboBox 的 setItems 调用：

at com.agiletunes.EditorCtrl.versionSelection(EditorCtrl.java:173)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8413)
    at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.handleControlPropertyChanged(ComboBoxListViewSkin.java:179)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase.lambda$registerChangeListener$61(BehaviorSkinBase.java:197)
    at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
    at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)
    at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
    at javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:150)
    at javafx.scene.control.ComboBox.updateValue(ComboBox.java:463)
    at javafx.scene.control.ComboBox.access$200(ComboBox.java:192)
    at javafx.scene.control.ComboBox$3.changed(ComboBox.java:446)
    at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)
    at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)
    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
    at javafx.scene.control.SelectionModel.setSelectedItem(SelectionModel.java:102)
    at javafx.scene.control.ComboBox$ComboBoxSelectionModel.lambda$new$154(ComboBox.java:494)
    at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
    at javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
    at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113)
    at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147)
    at javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:68)
    at javafx.scene.control.SingleSelectionModel.updateSelectedIndex(SingleSelectionModel.java:215)
    at javafx.scene.control.SingleSelectionModel.clearSelection(SingleSelectionModel.java:68)
    at javafx.scene.control.SingleSelectionModel.select(SingleSelectionModel.java:144)
    at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.lambda$createListView$323(ComboBoxListViewSkin.java:484)
    at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
    at javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
    at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113)
    at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147)
    at javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:68)
    at javafx.scene.control.MultipleSelectionModelBase.clearSelection(MultipleSelectionModelBase.java:682)
    at javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateDefaultSelection(ListView.java:1481)
    at javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateItemsObserver(ListView.java:1459)
    at javafx.scene.control.ListView$ListViewBitSetSelectionModel.access$1200(ListView.java:1167)
    at javafx.scene.control.ListView$ListViewBitSetSelectionModel$1.invalidated(ListView.java:1197)
    at javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
    at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
    at javafx.scene.control.ListView.setItems(ListView.java:390)
    at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.updateListViewItems(ComboBoxListViewSkin.java:222)
    at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.lambda$new$322(ComboBoxListViewSkin.java:119)
    at javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
    at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
    at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
    at javafx.scene.control.ComboBox.setItems(ComboBox.java:286)
    at com.agiletunes.EditorCtrl.setHierarchicalElement(EditorCtrl.java:120)
Run Code Online (Sandbox Code Playgroud)

先感谢您！

fab*_*ian 6

来自JavadoconAction

ComboBox每当ComboBox value属性更改时调用的操作。这可能是由于以value编程方式更改了属性 [或 ...]

更换items导致的value设定为null可能导致onAction触发。

您可以onAction在替换时简单地删除事件处理程序items以防止它被触发或使用您的方法之一与布尔值。

EventHandler<ActionEvent> handler = comboBox.getOnAction();
comboBox.setOnAction(null);
comboBox.setItems(FXCollections.observableArrayList("4", "5", "6"));
comboBox.setOnAction(handler);
Run Code Online (Sandbox Code Playgroud)

归档时间：

查看次数：

2549 次

最近记录：

8 年，10 月 前
相关归档
WPF如何将带有描述的枚举绑定到组合框 11
JavaFX:使用箭头键滚动与焦点遍历 6
将项目符号添加到JavaFX标签 6
如何在JavaFx中为不同的分辨率自动调整窗口大小？ 6
如何制作JavaFX-Widget 5
JavaFX 全屏窗口：删除弹出文本 5
在Java中调试 - 设置debugMode标志 4
带有Listbox和带有绑定的Combobox的WPF主 - 详细信息视图 3
在 Java FX 中扩展类？ 3
Platform.runLater问题 - 延迟执行 2
难疑归档
如何重定向到其他网页？ 7725
如何使用正则表达式验证电子邮件地址？ 3201
npm package.json文件中依赖项,devDependencies和peerDependencies之间有什么区别？ 1872
JavaScript切断/切片/修剪字符串中的最后一个字符 1840
确定对象的类型？ 1700
lodash和下划线之间的差异 1566
使当前的Git分支成为主分支 1555
如何找出哪个DOM元素具有焦点？ 1234
适用于PDF文件的MIME媒体类型 1229
如何获取Android应用程序的构建版本号？ 1198