編集履歴

回答編集履歴

驚くべき手法

2025/02/17 05:29

投稿

スコア9937

test CHANGED Viewed

@@ -139,3 +139,18 @@
 [event handling - How to listen for WindowEvent.WINDOW_SHOWN in the nodes of the scene graph? - Stack Overflow](https://stackoverflow.com/questions/8944445)
 [java - JavaFX 2 Window event handling in controllers - Stack Overflow](https://stackoverflow.com/questions/21602362)
+---
+> 何か手がないかOpenJFXのソースをつらつら眺めていたら、目からうろこの驚くべき手法を発見しましたっ！！🤩
+このように`setSkin`すれば、表示を待たずとも`viewport`が作成されます。
+```java
+ScrollPane box_sp = new ScrollPane();
+box_sp.setSkin(new ScrollPaneSkin(box_sp));
+box_sp.lookup(".viewport").setCache(false);
+```
+[ScrollPaneSkin.java · openjdk/jfx](https://github.com/openjdk/jfx/blob/d07d5cc684e68615fd0cec154a4e4c18810af1eb/modules/javafx.controls/src/main/java/javafx/scene/control/skin/ScrollPaneSkin.java#L655)

runLater

2025/02/16 03:59

投稿

TN8001

スコア9937

test CHANGED Viewed

@@ -104,6 +104,10 @@
                     scrollPane.lookup(".viewport").setCache(false);
                 });
             });
+        // 手元ではこれだけで行けたがそれでいいのかは知らんｗ
+        // Platform.runLater(() -> scrollPane.lookup(".viewport").setCache(false));
     }
 }
 ```

FXML版

2025/02/16 03:19

投稿

TN8001

スコア9937

test CHANGED Viewed

@@ -47,3 +47,91 @@
     }
 }
 ```
+---
+FXML版
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+<Pane fx:id="root" xmlns="http://javafx.com/javafx/17.0.12" xmlns:fx="http://javafx.com/fxml/1"
+      fx:controller="com.example.demo.HelloController">
+    <TextField layoutX="0.5" text="TextFieldA"/>
+    <VBox layoutX="0.5" layoutY="50.0">
+        <TextField text="TextFieldB"/>
+    </VBox>
+    <ScrollPane fx:id="scrollPane" layoutX="0.5" layoutY="100.0">
+        <VBox>
+            <TextField text="TextFieldC"/>
+        </VBox>
+    </ScrollPane>
+</Pane>
+```
+```java
+package com.example.demo;
+import javafx.beans.binding.Bindings;
+import javafx.fxml.FXML;
+import javafx.scene.control.ScrollPane;
+import javafx.scene.layout.Pane;
+import javafx.stage.Window;
+import javafx.stage.WindowEvent;
+public class HelloController {
+    @FXML private Pane root;
+    @FXML private ScrollPane scrollPane;
+    @FXML void initialize() {
+        // どちらかひとつでいい
+        // [event handling - How to listen for WindowEvent.WINDOW_SHOWN in the nodes of the scene graph? - Stack Overflow](https://stackoverflow.com/questions/8944445)
+        root.sceneProperty().addListener((observable, oldValue, newValue) -> {
+            newValue.windowProperty().addListener((observable1, oldValue1, newValue1) -> {
+                newValue1.addEventHandler(WindowEvent.WINDOW_SHOWN, event -> {
+                    scrollPane.lookup(".viewport").setCache(false);
+                });
+            });
+        });
+        // [java - JavaFX 2 Window event handling in controllers - Stack Overflow](https://stackoverflow.com/questions/21602362)
+        Bindings.<Window>select(root.sceneProperty(), "window")
+            .addListener((observable, oldValue, newValue) -> {
+                newValue.addEventHandler(WindowEvent.WINDOW_SHOWN, event -> {
+                    scrollPane.lookup(".viewport").setCache(false);
+                });
+            });
+    }
+}
+```
+```java
+package com.example.demo;
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+import java.io.IOException;
+public class HelloApplication extends Application {
+    public static void main(String[] args) {
+        launch();
+    }
+    @Override public void start(Stage stage) throws IOException {
+        FXMLLoader fxmlLoader = new FXMLLoader(HelloApplication.class.getResource("hello-view.fxml"));
+        Scene scene = new Scene(fxmlLoader.load(), 320, 240);
+        stage.setTitle("Hello!");
+        stage.setScene(scene);
+        stage.show();
+    }
+}
+```
+[event handling - How to listen for WindowEvent.WINDOW_SHOWN in the nodes of the scene graph? - Stack Overflow](https://stackoverflow.com/questions/8944445)
+[java - JavaFX 2 Window event handling in controllers - Stack Overflow](https://stackoverflow.com/questions/21602362)

中途半端な位置に追加が原因ならCSSでは対策しようがないか...？

2025/02/14 10:27

投稿

TN8001

スコア9937

test CHANGED Viewed

@@ -47,5 +47,3 @@
     }
 }
 ```
-CSSだけで済むようなもっとスマートな方法もある気もしますが、わたしは深堀する気はないですｗ

不要クラス

2025/02/14 10:04

投稿

TN8001

スコア9937

test CHANGED Viewed

@@ -17,35 +17,33 @@
 import javafx.scene.layout.VBox;
 import javafx.stage.Stage;
-public class Main {
+public class App extends Application {
     public static void main(String[] args) {
         Application.launch(App.class, args);
     }
-    public static class App extends Application {
-        @Override public void start(Stage primaryStage) {
+    @Override public void start(Stage primaryStage) {
-            // 整数ならsetCacheにかかわらずボケない？
+        // 整数ならsetCacheにかかわらずボケない？
-            // var x = 5;
+        // var x = 5;
-            var x = 0.5;
+        var x = 0.5;
-            var textField = new TextField("TextFieldA");
+        var textField = new TextField("TextFieldA");
-            textField.setLayoutX(x);
+        textField.setLayoutX(x);
-            var vBox = new VBox(new TextField("TextFieldB"));
+        var vBox = new VBox(new TextField("TextFieldB"));
-            vBox.setLayoutX(x);
+        vBox.setLayoutX(x);
-            vBox.setLayoutY(50);
+        vBox.setLayoutY(50);
-            var scrollPane = new ScrollPane(new VBox(new TextField("TextFieldC")));
+        var scrollPane = new ScrollPane(new VBox(new TextField("TextFieldC")));
-            scrollPane.setLayoutX(x);
+        scrollPane.setLayoutX(x);
-            scrollPane.setLayoutY(100);
+        scrollPane.setLayoutY(100);
-            primaryStage.setScene(new Scene(new Pane(textField, vBox, scrollPane)));
+        primaryStage.setScene(new Scene(new Pane(textField, vBox, scrollPane)));
-            primaryStage.show();
+        primaryStage.show();
-            scrollPane.lookup(".viewport").setCache(false);
+        scrollPane.lookup(".viewport").setCache(false);
-        }
     }
 }
 ```