在javaFX中将文本区域自动调整为标签页 [英] Autosize text area into tabpane in javaFX

问题描述

我在标签页中有3个标签，每个标签都有一个文本区域，文本不同，长度不同。
我想根据文本区域在每个选项卡的长度自动调整大小。
我不明白我该怎么办？使用场景构建器？ css？javaFX方法？
谢谢在进阶...

I hava 3 tabs in a TabPane that each one has a text area with different texts and different length. I want to autosize text area according to it's length in each tab. I don't understand what should I do ? using scene builder ? css ?javaFX methods ? Thank's in Advance ...

推荐答案

我想你要求文本区域根据

I think you are asking that the text areas grow or shrink according to the text that is displayed in them?

如果是，请检查此代码是否有帮助：

If so, see if this code helps:

import java.util.concurrent.Callable;

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class AutosizingTextArea extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextArea textArea = new TextArea();
        textArea.setMinHeight(24);
        textArea.setWrapText(true);
        VBox root = new VBox(textArea);
        Scene scene = new Scene(root, 600, 400);
        primaryStage.setScene(scene);
        primaryStage.show();

        // This code can only be executed after the window is shown:

        // Perform a lookup for an element with a css class of "text"
        // This will give the Node that actually renders the text inside the
        // TextArea
        Node text = textArea.lookup(".text");
        // Bind the preferred height of the text area to the actual height of the text
        // This will make the text area the height of the text, plus some padding
        // of 20 pixels, as long as that height is between the text area's minHeight
        // and maxHeight. The minHeight we set to 24 pixels, the max height will be
        // the height of its parent (usually).
        textArea.prefHeightProperty().bind(Bindings.createDoubleBinding(new Callable<Double>(){
            @Override
            public Double call() throws Exception {
                return text.getBoundsInLocal().getHeight();
            }
        }, text.boundsInLocalProperty()).add(20));

    }

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

如果你想让这个可重用，考虑子类化 TextArea 。 （一般来说，我不喜欢子类化控制类。）这里棘手的部分是执行代码，使 TextArea 展开一旦它被添加到一个直播场景图这是查找工作所必需的）。一种方法是使用 AnimationTimer 执行查找，一旦查找成功，就可以停止。我在这里嘲笑了这个问题。

If you want to make this reusable, then you could consider subclassing TextArea. (In general, I dislike subclassing control classes.) The tricky part here would be to execute the code that makes the TextArea expand once it has been added to a live scene graph (this is necessary for the lookup to work). One way to do this (which is a bit of a hack, imho) is to use an AnimationTimer to do the lookup, which you can stop once the lookup is successful. I mocked this up here.

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