JavaFX GridPane：如果内容被禁用并且不可见，则缩小 [英] JavaFX GridPane: Shrink if content is disabled and invisible

问题描述

如果该行的内容被禁用和不可见，是否可以缩小GridPane行？

Is it possible to shrink a GridPane row if the content of that row is both disabled and invisible?

当我将Node设置为disable = true和visible =

When I set a Node to disable=true and visible=false, the cell still takes up space.

如果我有8行，只有第一个和最后一个可见，我不想空行占用太多空间。好像只有两行。

If I have 8 rows and only the first and last is visible I don't want the empty rows to take up much space. As if there was only two rows.

我能找到的唯一解决方案是将大小设置为零。但是，我认为这不是一个好的解决方案。当节点再次启用/可见时，我将必须存储最小/最大大小才能将其设置回去。
CSS可能会提供更好的解决方案吗？

The only "solution" I could find was to set the size to zero. However I do not consider that a good solution. I would have to store the min/max size to set it back when/if the node becomes enabled/visible again. Could perhaps CSS help with a better solution?

package com.company;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.stage.Stage;

public class App extends Application {

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

    /* (non-Javadoc)
     * @see javafx.application.Application#start(javafx.stage.Stage)
     */
    @Override
    public void start(Stage stage) throws Exception {
        Label label1 = new Label("Text");
        Label label2 = new Label("Text");
        Label label3 = new Label("Text");

        label2.setDisable(true);
        label2.setVisible(false);

        GridPane root = new GridPane();
        root.setGridLinesVisible(true);
        root.add(label1, 0, 0);
        GridPane.setVgrow(label1, Priority.NEVER);
        root.add(label2, 0, 1);
        GridPane.setVgrow(label2, Priority.NEVER);
        root.add(label3, 0, 2);
        GridPane.setVgrow(label3, Priority.NEVER);

        stage.setScene(new Scene(root));
        stage.setWidth(300);
        stage.setHeight(300);
        stage.setTitle("JavaFX 8 app");
        stage.show();
    }
}

推荐答案

如果如果您不希望父节点布置节点，则可以将节点的托管属性设置为 false 。

If you do not want the parent to layout a node, you can set the managed property of the node to false.

以下是当我在您的代码中使用以下行时显示布局差异的图像：

Here is an image showing the difference in layout when I used the following line in your code:

label2.setManaged(false);

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