JavaFX 2 - 设置defaultButton属性：互斥？

时间：2013-05-04 15:33:49

标签： user-interface javafx-2 javafx

在Visual Basic 6中，如果将窗体按钮控件的DefaultButton属性设置为true，则表单中所有其他按钮控件上的相同属性设置为false，即属性是互斥的（如单选按钮） ）。

我的GUI上的行为似乎表明JavaFX中的多个按钮可能将defaultButton属性设置为true，并且多个按钮将从系统接收VK_Enter按钮事件。

setDefaultButton（）方法和defaultButton属性的JavaFX 2.2文档没有说明这个问题。

我有一个AnchorPanel带有一堆控件，另一个带有一组独立的控件。这些显示在同一个舞台上，哪一个是setVisible（true）给用户取决于他正在使用的信息。

我想知道是否需要迭代活动窗格上的按钮控件并在我尝试将其设置为true之前将所有这些属性的defaultButton属性设置为false，以避免因多个导致的奇怪行为按钮接收输入密钥事件。

EDIT 05/05/2013 - 这是我的ChangeListener代码。我最初把它写成一个匿名的内部类，我直接附加到TextField控件txtDx的focusedProperty。但是，我想也许我可以通过在我不希望它被触发的那些时间（即，当它的窗格是不可见或禁用时）移除监听器来修复我的错误。所以我将Listener移动到一个内部类，并通过实例变量引用它的实例。通过引用，我可以根据显示的窗格添加和删除监听器。

无论如何，这是Listener类：

private class FocusPropertyChangeListener implements ChangeListener<Boolean> {

    FocusPropertyChangeListener() { System.out.println("New FPCL instance"); }

    @Override
    public void changed(ObservableValue<? extends Boolean> ov, 
        Boolean oldb, Boolean newb) {
        System.out.println("Focus change triggered");

        if (ancEncEditor.isVisible() && !ancEncEditor.isDisabled()) {
            boolean b = (newb != null && newb.booleanValue() == true);
            System.out.println("txtDx focus change event triggered: DxAdd = " + b);

            btnWindowCommit.setDefaultButton(!b);
            btnWindowClose.setCancelButton(true);
            btnDxAdd.setDefaultButton(b);
        }
    }
}

正如您所看到的，在事件处理程序中，我对setDefaultButton进行了两次（可能是并发的）调用。如果我在txtDx中编辑，则意图是使用btnDxAdd，否则使用btnWindowCommit。我将尝试摆脱对setDefaultButton的大概不需要的调用，看看我是否仍然得到ConcurrentModificationExceptions。

EDIT 05/05/2013 - 添加堆栈跟踪。这就是...... 

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
at java.util.HashMap$EntryIterator.next(HashMap.java:934)
at java.util.HashMap$EntryIterator.next(HashMap.java:932)
at com.sun.javafx.collections.ObservableMapWrapper$ObservableEntrySet$1.next(ObservableMapWrapper.java:560)
at com.sun.javafx.collections.ObservableMapWrapper$ObservableEntrySet$1.next(ObservableMapWrapper.java:548)
at com.sun.javafx.scene.KeyboardShortcutsHandler.processAccelerators(KeyboardShortcutsHandler.java:286)
at com.sun.javafx.scene.KeyboardShortcutsHandler.dispatchBubblingEvent(KeyboardShortcutsHandler.java:119)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$KeyHandler.process(Scene.java:3513)
at javafx.scene.Scene$KeyHandler.access$2300(Scene.java:3472)
at javafx.scene.Scene.impl_processKeyEvent(Scene.java:1904)
at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:2270)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:136)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:100)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:163)
at com.sun.glass.ui.View.handleKeyEvent(View.java:518)
at com.sun.glass.ui.View.notifyKey(View.java:951)
at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(Native Method)
at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:383)
at com.sun.glass.ui.EventLoop.enter(EventLoop.java:83)
at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:520)
at javafx.stage.Stage.showAndWait(Stage.java:397)
at org.kls.md.censusassistant.DialogController.showAndWait(DialogController.java:94)
at org.kls.md.censusassistant.DCMainEditor.handleEncDetails(DCMainEditor.java:287)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1435)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Node.fireEvent(Node.java:6863)
at javafx.scene.control.Button.fire(Button.java:179)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:193)
at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:336)
at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:329)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:64)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3328)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3168)
at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3123)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1563)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2265)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:250)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:173)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:292)
at com.sun.glass.ui.View.handleMouseEvent(View.java:528)
at com.sun.glass.ui.View.notifyMouse(View.java:922)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
at java.lang.Thread.run(Thread.java:722)

编辑05/05/2013 - 我改变了我的代码，以便我不再清除defaultButton的前设置，即只调用一次setDefaultButton（true）。我的想法是，由于支持代码使用Runnable执行此操作，因此 - 这就是我得到的ConcurrentModificationExceptions的原因。

所以，现在看来实际上当我尝试在btnDxAdd和btnWindowCommit之间切换为默认按钮时，我不再能够在我的代码中触发ConcurrentModificationExceptions。

然而......

我也无法获得我想要的行为。当我现在在txtDx控件中编辑时，我可以整天按Enter键，按钮不会触发。我已经确认我的focusProperty ChangeListener被激活，并且对txtDx.setDefaultButton（true）进行了一次调用。无论如何，我无法得到我想要的行为。

1 个答案:

答案 0 :(得分：2)

关于javadoc澄清的错误：javafx-jira.kenai.com/browse/RT-30200

有关实施的错误：https://javafx-jira.kenai.com/browse/RT-30206

我观察了皮肤类中的代码，可以从OpenJFX中观察到：

当你setDefault（true / false）时发生了什么：

Runnable defaultButtonRunnable = new Runnable() {
        public void run() {
            if (!getSkinnable().isDisabled()) {
                getSkinnable().fire();
            }
        }
    };

private void setDefaultButton(boolean value) {

    KeyCode acceleratorCode = KeyCode.ENTER;
    defaultAcceleratorKeyCodeCombination = 
            new KeyCodeCombination(acceleratorCode);

    if (! value) {
        /*
        ** first check of there's a default button already
        */
        Runnable oldDefault = getSkinnable().getParent().getScene().getAccelerators().get(defaultAcceleratorKeyCodeCombination);
        if (!defaultButtonRunnable.equals(oldDefault)) {
            /*
            ** is it us?
            */
            getSkinnable().getParent().getScene().getAccelerators().remove(defaultAcceleratorKeyCodeCombination);
        }
    }
    getSkinnable().getParent().getScene().getAccelerators().put(defaultAcceleratorKeyCodeCombination, defaultButtonRunnable);
}

工作原理：当您将新按钮设置为默认按钮时，它会找到现有的默认按钮，并从存储在场景中的acelerator列表中按下ENTER按键上的acelerator。并将其自身添加为默认按钮。所以你不需要在其他按钮上设置默认值。

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