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December 14, 2016 00:51
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Demonstration of a bug in the JavaFX WebView (tested with Java 8 u111).In order to see the bug, resize the window. Tested with jdk-9-ea+148_windows-x64_bin.exe as well. Use -Dprism.showdirty=true to see dirty regions.
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| import javafx.animation.KeyFrame; | |
| import javafx.animation.Timeline; | |
| import javafx.application.Application; | |
| import javafx.concurrent.Worker.State; | |
| import javafx.scene.Scene; | |
| import javafx.scene.web.WebEngine; | |
| import javafx.scene.web.WebView; | |
| import javafx.stage.Stage; | |
| import javafx.util.Duration; | |
| import netscape.javascript.JSObject; | |
| import java.util.concurrent.atomic.AtomicInteger; | |
| public class WebViewBug extends Application { | |
| private WebEngine engine; | |
| private AtomicInteger testNumber; | |
| public static void main(String[] args) { | |
| launch(args); | |
| } | |
| @Override | |
| public void start(Stage primaryStage) throws Exception { | |
| testNumber = new AtomicInteger(); | |
| WebView webView = new WebView(); | |
| engine = webView.getEngine(); | |
| engine.loadContent("<!DOCTYPE html>\n" + | |
| "<html>\n" + | |
| "<head>\n" + | |
| " <style type=\"text/css\">\n" + | |
| " .row:nth-child(odd) {\n" + | |
| " background: #ccc;\n" + | |
| " }\n" + | |
| " </style>\n" + | |
| "</head>\n" + | |
| "<body id=\"content\">\n" + | |
| "</body>\n" + | |
| "</html>"); | |
| primaryStage.setScene(new Scene(webView, 100, 100)); | |
| primaryStage.show(); | |
| Timeline timeline = new Timeline( | |
| new KeyFrame(Duration.millis(200), (actionEvent) | |
| -> append(("<div class=\"row\">Test " + String.valueOf(testNumber.incrementAndGet()) + "</div>"))) | |
| ); | |
| timeline.setCycleCount(-1); | |
| engine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> { | |
| if (newValue == State.SUCCEEDED) { | |
| timeline.playFromStart(); | |
| } | |
| }); | |
| } | |
| private void append(String html) { | |
| ((JSObject) engine.executeScript("document.getElementById('content')")) | |
| .call("insertAdjacentHTML", "beforeend", html); | |
| engine.executeScript("window.scrollTo(0, document.documentElement.scrollHeight);"); | |
| } | |
| } |
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