Question

当我点击自定义颜色链接时，我得到了这个可怕的NullPointerException：

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.stage.Window$9.invalidated(Window.java:867)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
at javafx.stage.Window.setShowing(Window.java:922)
at javafx.stage.Window.show(Window.java:937)
at javafx.stage.Stage.show(Stage.java:259)
at com.sun.javafx.scene.control.skin.CustomColorDialog.show(CustomColorDialog.java:170)
at com.sun.javafx.scene.control.skin.ColorPalette$1.handle(ColorPalette.java:127)
at com.sun.javafx.scene.control.skin.ColorPalette$1.handle(ColorPalette.java:105)
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.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:8411)
at javafx.scene.control.Hyperlink.fire(Hyperlink.java:153)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
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.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

外观如何：

有可能解决它吗？也许有一些方法可以削减底部的链接？代码：

colorMenu = new Menu("Color");
    ColorPicker colorPicker = new ColorPicker();
    colorPicker.setValue(Color.FIREBRICK);
    m_palette = new MenuItem(null, colorPicker);
    m_palette.setOnAction(event -> gameScene.setCellColor(colorPicker.getValue()));

感谢您的任何建议！

Answer 1

可以从ColorPicker中删除有问题的超链接。在这里，我们使用自己的ColorPickerSkin创建一个ColorPicker。然后我们可以拦截返回前在皮肤中创建弹出内容以删除超链接。

public class CustomColorPicker extends ColorPicker {

    @Override
    protected Skin<?> createDefaultSkin() {
        return new CustomColorPickerSkin(this);
    }

    private class CustomColorPickerSkin extends ColorPickerSkin {

        public CustomColorPickerSkin(ColorPicker control) {
            super(control);
        }

        @Override
        protected Node getPopupContent() {
            Node colorPalette = super.getPopupContent(); // This is an instance of private API ColorPalette which
                                                            // extends Region
            Region r = (Region) colorPalette;
            List<Node> vboxes = r.getChildrenUnmodifiable().stream().filter(e -> {
                return e instanceof VBox;
            }).collect(Collectors.toList()); // This ColorPalette contains a VBox which contains the Hyperlink we want
                                                // to remove.
            for (Node n : vboxes) {
                VBox vbox = (VBox) n;
                List<Node> hyperlinks = vbox.getChildren().stream().filter(e -> {
                    return e instanceof Hyperlink;
                }).collect(Collectors.toList());
                vbox.getChildren().removeAll(hyperlinks); // Remove the hyperlink
            }
            return colorPalette;
        }

    }

}

这将找到并删除ColorPalette中任何VBox内部的所有超链接。请记住，如果更改ColorPalette的结构，它会中断，由于它不是公共API，因此完全有可能。

外观：

Answer 2

我通过创建MenuItem的Menu对象insead来避免这个问题。它现在看起来像这样：Screenshot

JavaFX ColorPicker NullPointerException

2 个答案: