Question

我不知道为什么单元格内容可以超出gridpanes rowconstraint的限制，尽管设置了最大值。我试图以某种方式剪辑它，但我没有得到单元格的实际高度（当我动态地改变它时）。正如您在图像上看到的那样，绿色矩形太大了。我怎么能动态地限制它的高度？

这是一个小例子：

    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.layout.GridPane;
    import javafx.scene.layout.Pane;
    import javafx.scene.layout.RowConstraints;
    import javafx.scene.paint.Color;
    import javafx.scene.shape.Rectangle;
    import javafx.stage.Stage;


    public class Main extends Application {
        @Override
        public void start(Stage primaryStage) {
            try {
                GridPane gp = new GridPane();
                gp.setGridLinesVisible(true);

                gp.setVgap(10);
                gp.add(new Pane(new Rectangle(100,100,Color.rgb(255, 0, 0, 0.5))), 0, 0);
                gp.add(new Pane(new Rectangle(100,200,Color.rgb(0,255,0,0.5))), 0, 1);

                gp.getRowConstraints().add(new RowConstraints(50,100,110));
                gp.getRowConstraints().add(new RowConstraints(50,100,110));

                Scene scene = new Scene(gp,400,400);
                primaryStage.setScene(scene);
                primaryStage.show();
            } catch(Exception e) {
                e.printStackTrace();
            }
        }

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

Answer 1

Meta：好的，接下来尝试，这次作为修改代码的答案。

To topic：设置RowConstraints后，您可以迭代GridPane的子节点，看看它们是否超过了首选高度。如果是，那么

剪辑节点
在GridPane中为该节点设置Vgrow

这是否符合您的需求？

public class RowConstraintsExample extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            GridPane gp = new GridPane();
            gp.setGridLinesVisible(true);

            int minHeight = 50;
            int preferredHeight = 100;
            int maxHeight = 110;

            gp.setVgap(10);
            gp.add(new Pane(new Rectangle(100,100,Color.rgb(255, 0, 0, 0.5))), 0, 0);
            gp.add(new Pane(new Rectangle(100,200,Color.rgb(0,255,0,0.5))), 0, 1);

            gp.getRowConstraints().add(new RowConstraints(minHeight, preferredHeight, maxHeight));
            gp.getRowConstraints().add(new RowConstraints(minHeight, preferredHeight, maxHeight));

            for (Node node: gp.getChildren()) {
                Integer rowIndex = GridPane.getRowIndex(node);
                if (rowIndex != null) {
                    RowConstraints rowConstraints = gp.getRowConstraints().get(rowIndex);

                    if (node.getBoundsInLocal().getHeight() > rowConstraints.getPrefHeight()) {
                        node.setClip(new Rectangle(100, rowConstraints.getMaxHeight()));
                        GridPane.setVgrow(node, Priority.SOMETIMES);
                    }
                }
            }

            Scene scene = new Scene(gp,400,400);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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

Answer 2

您可以按如下方式调整代码并使用剪切矩形：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Pane;
import javafx.scene.layout.RowConstraints;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;


public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            GridPane gp = new GridPane();
            gp.setGridLinesVisible(true);

            gp.setVgap(10);
            gp.getRowConstraints().add(new RowConstraints(50,100,110));
            gp.getRowConstraints().add(new RowConstraints(50,100,110));

            Pane pane1 = new Pane(new Rectangle(100,100,Color.rgb(255, 0, 0, 0.5)));
            Pane pane2 = new Pane(new Rectangle(100,200,Color.rgb(0, 255, 0, 0.5)));

            Rectangle clipRectangle1 = new Rectangle();
            pane1.setClip(clipRectangle1);
            pane1.layoutBoundsProperty().addListener((observable, oldValue, newValue) -> {
                clipRectangle1.setWidth(newValue.getWidth());
                clipRectangle1.setHeight(newValue.getHeight());
            });   

            Rectangle clipRectangle2 = new Rectangle();
            pane2.setClip(clipRectangle2);
            pane2.layoutBoundsProperty().addListener((observable, oldValue, newValue) -> {
                clipRectangle2.setWidth(newValue.getWidth());
                clipRectangle2.setHeight(newValue.getHeight());
            });

            gp.add(pane1, 0, 0);
            gp.add(pane2, 0, 1);

            Scene scene = new Scene(gp,400,400);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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

Javafx Gridpanes内容超出了大小

2 个答案: