Question

我有一个应用程序，有时会显示一个模态对话框，但是在收到外部消息后，我希望删除该对话框并将其替换为另一个，因为情况已经改变，第一个对话框不再适用。

但是第二个对话框没有正确重绘，父级也没有。

Background does not repaint when dialog moved

我在jdk-8u11-windows-x64上看到过这个问题，控件有fx controlsfx-8.0.6，还有control-fx-8.20.8。我设法在我的应用程序之外重新创建了这个问题

import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;

import org.controlsfx.dialog.Dialog;

public class NestedEventLoop extends Application {

    private Dialog firstDialog;
    private Object stage;

    @Override
    public void start(Stage stage) throws Exception {
        Button button = new Button("press");
        button.setOnAction((e) -> {
            firstDialog = new Dialog(stage, "dialog", false);
            firstDialog.setContent("Content...");
            openAnotherDialogLater();
            firstDialog.show();

        });
        stage.setScene(new Scene(button));
        stage.show();
        this.stage = stage;
    }

    private void openAnotherDialogLater() {
        Runnable openDialog = () -> {
            firstDialog.hide();
            Dialog anotherDialog = new Dialog(stage, "anotherDialog", false);
            anotherDialog.show();
        };

        Executors.newScheduledThreadPool(1).schedule(() -> {
            Platform.runLater(openDialog);
        }, 2, TimeUnit.SECONDS);
    }

    public static void main(String[] args) {
        launch(args);
    }
}

我对正在发生的事情的分析。

当第一个对话框打开时，JavaFX线程进入“嵌套事件循环”
当需要第二个对话框时，对hide（）的调用不会导致第一个嵌套的事件循环退出
在第一个上面创建一个新的嵌套事件循环 - 这似乎是重绘问题的原因。

我的问题

如何在打开第二个对话框之前关闭第一个对话框并退出第一个嵌套循环？ - 没有任意睡眠等。

在第二个对话框打开时从jconsole堆栈跟踪。

com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method)
com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:142)
com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:500)
com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)
com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:542)
javafx.stage.Stage.showAndWait(Stage.java:455)
org.controlsfx.dialog.HeavyweightDialog$1.showAndWait(HeavyweightDialog.java:87)
org.controlsfx.dialog.HeavyweightDialog.show(HeavyweightDialog.java:284)
org.controlsfx.dialog.Dialog.show(Dialog.java:384)
NestedEventLoop.lambda$1(NestedEventLoop.java:37)
NestedEventLoop$$Lambda$7/7730735.run(Unknown Source)
com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
java.security.AccessController.doPrivileged(Native Method)
com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method)
com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:142)
com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:500)
com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)
com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:542)
javafx.stage.Stage.showAndWait(Stage.java:455)
org.controlsfx.dialog.HeavyweightDialog$1.showAndWait(HeavyweightDialog.java:87)
org.controlsfx.dialog.HeavyweightDialog.show(HeavyweightDialog.java:284)
org.controlsfx.dialog.Dialog.show(Dialog.java:384)
NestedEventLoop.lambda$0(NestedEventLoop.java:24)
NestedEventLoop$$Lambda$1/12269754.handle(Unknown Source)
com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
javafx.event.Event.fireEvent(Event.java:204)
javafx.scene.Node.fireEvent(Node.java:8175)
javafx.scene.control.Button.fire(Button.java:185)
com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
javafx.event.Event.fireEvent(Event.java:204)
javafx.scene.Scene$MouseHandler.process(Scene.java:3746)
javafx.scene.Scene$MouseHandler.access$1800(Scene.java:3471)
javafx.scene.Scene.impl_processMouseEvent(Scene.java:1695)
javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2486)
com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:314)
com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:243)
java.security.AccessController.doPrivileged(Native Method)
com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:345)
com.sun.glass.ui.View.handleMouseEvent(View.java:526)
com.sun.glass.ui.View.notifyMouse(View.java:898)
com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
java.lang.Thread.run(Thread.java:745)

更新：自从写完这个问题后，我发现了一种解决方法，即使用runLater（）关闭第一个对话框，然后用另一个runLater（）打开新对话框。尽管如此，我仍然对其他人的想法感兴趣。

private void openAnotherDialogLater() {
    Runnable closeDialog = () -> {
        firstDialog.hide();
    };
    Runnable openDialog = () -> {
        Dialog anotherDialog = new Dialog(stage, "anotherDialog", false);
        anotherDialog.show();
    };

    Executors.newScheduledThreadPool(1).schedule(() -> {
        Platform.runLater(closeDialog);
        Platform.runLater(openDialog);
    }, 2, TimeUnit.SECONDS);
}

Answer 1

无论我的评论如何，我建议在JDK 8u40中使用新的Dialogs API。您可以在第一个对话框的结果类型中表示外部消息的到达，如果消息到达，则在处理第一个对话框的结果时打开第二个对话框：

enum Result { MSG_ARRIVED, ... }

Dialog<Result> firstDialog = ...;

firstDialog.showAndWait().ifPresent(res -> {
    if(res == Result.MSG_ARRIVED) {
        anotherDialog = ...;
        anotherDialog.show();
    }
});

当消息到达时，只需将第一个对话框的结果设置为MSG_ARRIVED并关闭对话框：

Platform.runLater(() -> {
    firstDialog.setResult(Result.MSG_ARRIVED);
    firstDialog.hide();
});

更换开放模式对话框的JavaFX问题

1 个答案: