如何等待在JavaFX应用程序WebEngine /浏览器初始化？ [英] How to wait for WebEngine/Browser initialization in JavaFx application?

问题描述

我想创建一个基于JavaFX的WebEngine定制FunctionPlotter组件。我的地块将在浏览器中显示。在我执行我的命令，情节我不得不等待，直到在浏览器已被初始化（加载d3.js）。目前，我通过把我的阴谋的前pressions在一个Runnable这样做，并传递到可运行的FunctionPlotter。 （该FunctionPlotter传递可运行到装载完成浏览器的钩）：

I would like to create a custom FunctionPlotter component that is based on the JavaFx WebEngine. My plots will be shown in a browser. Before I execute my plot commands I have to wait until the browser has been initialized (it loads d3.js). Currently I do so by putting my plot expressions in a Runnable and pass that runnable to the FunctionPlotter. (The FunctionPlotter passes the runnable to the loading finished hook of the browser):

private FunctionPlotter plotter;
...

Runnable plotRunnable = ()->{
    plotter.plot("x^2");
}

plotter = new FunctionPlotter(plotRunnable);

不过，我想preFER以下为我FunctionPlotter组件的使用（阻塞）工作流程：

However I would prefer following (blocking) work flow for the usage of my FunctionPlotter component:

Functionplotter plotter = new FunctionPlotter();
plotter.plot("x^2")

=>的FunctionPlotter应自动等到包裹浏览器已被初始化。

=> The FunctionPlotter should automatically wait until the wrapped browser has been initialized.

我应该如何做到这一点在JavaFX应用程序？

How should I do this in an JavaFx Application?

在FunctionPlotter我可以做类似

Inside the FunctionPlotter I could do something like

private Boolean isInitialized = false
...

ReadOnlyObjectProperty<State> state =  webEngine.getLoadWorker().stateProperty();
state.addListener((obs, oldState, newState) -> {
    boolean isSucceeded = (newState == Worker.State.SUCCEEDED);
    if (isSucceeded) {
        isInitialized = true;
    }
});
webEngine.loadContent(initialBrowserContent);

waitUntilInitialLoadingIsFinished();

我实际的问题是如何在最后一行的方法可以实现。如果我使用以下code，应用程序将永远等下去：

My actual question is how the method on the last line could be implemented. If I use following code, the application will wait for ever:

private void waitUntilBrowserIsInitialized() {
    while(!isInitialized){
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        }
    }
}

我知道，有一个像JavaFx的任务的东西，Platform.runLater（），服务，CountdownLatch（的 JavaFx的一个线程和GUI 工作），但这些并没有帮助我（=我没有得到它的工作）。我怎么能在主线程等待，直到一个Runnable完成？

I know that there is stuff like JavaFx Tasks, Platform.runLater(), Service, CountdownLatch (JavaFx Working with threads and GUI) but those did not help me (= I did not get it working). How can I wait in the main Thread until a Runnable is finished?

下面有人说，JavaFX应用程序的线程不应该被阻止：

Here someone says that the JavaFx Application thread should never be blocked:

<一个href=\"http://stackoverflow.com/questions/29800410/make-javafx-application-thread-wait-for-another-thread-to-finish\">Make JavaFX应用程序线程等待另一个线程来完成

任何其他建议？

修改

相关问题：<一href=\"http://stackoverflow.com/questions/19247872/javafx-swt-webview-synchronous-loadcontent\">JavaFX/SWT的WebView同步loadcontent（）

推荐答案

我决定在情节指令的内部队列包的情节功能。命令

I decided to wrap the plot functionality in an internal queue of plot instructions. The command

plotter.plot("x^2");

不会实际执行的情节，但一个绘图指令添加到队列。浏览器已经被初始化之后，该队列将通过工作，将与延迟来执行绘图命令。而浏览器被初始化，我会表现出一定的进度条。

will not actually execute the plot but add a plot instruction to the queue. After the browser has been initialized, that queue will be worked through and the plot commands will be executed with a delay. While the browser is initializing I will show some kind of progress bar.

如果您知道不需要解决此延迟执行的工作，请让我知道一个解决方案。

If you know a solution that does not need this delayed execution work around please let me know.

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