javafx

问题 I have a TextArea in which the user of my app can write things. A ChangeListener is also listening to the StringProperty "text" of this TextArea . Whenever the text content changes, ChangeListener.changed() , among other things, sets a "dirty" BooleanProperty to true on a central app object. Where "dirty" has the sense of "document needs saving". But I've just implemented a thing in my app whereby any time that the "dirty" Property gets set to true triggers a save-file-to-disk action,

问题 i was trying to create compile my application and create an executable file. as for now i see the best tool to use is javafx-maven-plugin. i couldn't get it to work, so i started with a basic code that is generated when creating a project according to this. https://www.youtube.com/watch?v=4vd-RE0X5Lg https://openjfx.io/openjfx-docs/#maven the basic example works but when i tried the same structure in my code or by simply adding a code that contains jfoenix to it. it cannot run. following line

问题 Is there a way to tell if a form is valid from Java? Basically, a method that returns true if all input fields constrains are satisfied and false otherwise. Strangely enough, org.w3c.dom.html.HTMLFormElement doesn't actually have a checkValidity() method. EDIT: Even more strangely, the implementation com.sun.webkit.dom.HTMLFormElementImpl does support the method checkValidity() . Unfortunately, the package com.sun.webkit is not accessible directly and thus the method is unavailable. 回答1: DOM

问题 Is there a way to tell if a form is valid from Java? Basically, a method that returns true if all input fields constrains are satisfied and false otherwise. Strangely enough, org.w3c.dom.html.HTMLFormElement doesn't actually have a checkValidity() method. EDIT: Even more strangely, the implementation com.sun.webkit.dom.HTMLFormElementImpl does support the method checkValidity() . Unfortunately, the package com.sun.webkit is not accessible directly and thus the method is unavailable. 回答1: DOM

问题 Is there a way to tell if a form is valid from Java? Basically, a method that returns true if all input fields constrains are satisfied and false otherwise. Strangely enough, org.w3c.dom.html.HTMLFormElement doesn't actually have a checkValidity() method. EDIT: Even more strangely, the implementation com.sun.webkit.dom.HTMLFormElementImpl does support the method checkValidity() . Unfortunately, the package com.sun.webkit is not accessible directly and thus the method is unavailable. 回答1: DOM

问题 I'm using the following class from my JavaFX Tutorial: import javafx.application.Application; import javafx.stage.Stage; public class HelloFXApp extends Application { public static void main(String[] args) { // Launch the JavaFX application Application.launch(args); } @Override public void start(Stage stage) { stage.setTitle("Hello JavaFX Application"); stage.show(); } } I'm using Ubuntu and I have the correct path to my .java file in my Terminal.. When I type "javac HelloFXApp.java" it works

问题 I'd like to bundle javafx 2.1 with my install4j installer, I know I can acheive this by manually depending on the specific .dll and .jar files. But I'd like to do this in the same simple manner that I do when bundling the JRE, is there a way of doing this? If not, will this feature be available soon(or at all) ? 回答1: The pre-made Java 7 JRE bundles that are downloadable in the install4j IDE already include JavaFX, so you don't have to do anything. Starting with install4j 8.x, you can choose

问题 In JavaFX subclasses of Control have a tooltip property which means that one can declaratively add a Tooltip using FXML thusly: <CheckBox fx:id="someCheckBox" mnemonicParsing="false" text="Do It?"> <tooltip> <Tooltip text="Whether or not to do it."/> </tooltip> </CheckBox> This is possible only because CheckBox is a subclass of Control. However, I would like to be able to add a tooltip to any scene-graph Node using FXML (i.e. without having to programatically add the tooltip using Java). 回答1:

问题 I am getting a NullPointerException regarding the location of my FXML. However, this only started to happen after I upgraded my JavaFX version (I need 13 to meet project requirements). My main class: public class Main extends Application { @Override public void start(Stage primaryStage) throws IOException { String path = "/fxml/loginScene.fxml"; Parent root = FXMLLoader.load(getClass().getResource(path)); primaryStage.initStyle(StageStyle.UNDECORATED); Scene scene = new Scene(root);

问题 My application generates heatmap images as fast as the CPU can (around 30-60 per second) and I want to display them in a single "live heatmap". In AWT/Swing, I could just paint them into a JPanel which worked like a charm. Recently, I switched to JavaFX and want to achieve the same here; at first, I tried with a Canvas, which was slow but okay-ish but had a severe memory leak problem, causing the application to crash. Now, I tried the ImageView component - which apparently is way too slow as