如何获取按钮来填充javafx gridpane?

时间:2016-02-11 16:24:20

标签: layout javafx-2 javafx-8

Java Swing具有<Directory /var/www/> AuthType Kerberos KrbServiceName HTTP/fqdn@realm Krb5Keytab /path/to/file.keytab Require valid-user </Directory> ,允许您指定小部件数组(如3X4)的大小。小部件然后填充他们占据的面板。你如何在JavaFX中获得类似的效果?

2 个答案:

答案 0 :(得分:20)

我想你问的是如何让一个节点在网格窗格中填充分配给其单元格的空间。

有几种方法可以做到这一点。您可以使用静态GridPane方法将GridPane特定属性设置应用于节点:

GridPane.setFillWidth(myButton, true);
GridPane.setFillHeight(myButton, true);

另一种方法是在网格窗格本身上指定列约束和行约束:

GridPane grid = new GridPane();
for (int rowIndex = 0; rowIndex < numRows; rowIndex++) {
    RowConstraints rc = new RowConstraints();
    rc.setVgrow(Priority.ALWAYS) ; // allow row to grow
    rc.setFillHeight(true); // ask nodes to fill height for row
    // other settings as needed...
    grid.getRowConstraints().add(rc);
}
for (int colIndex = 0; colIndex < numColumns; colIndex++) {
    ColumnConstraints cc = new ColumnConstraints();
    cc.setHgrow(Priority.ALWAYS) ; // allow column to grow
    cc.setFillWidth(true); // ask nodes to fill space for column
    // other settings as needed...
    grid.getColumnConstraints().add(cc);
}

在任何一种情况下,您都需要让节点增长,以便它们尊重网格窗格所需的增长请求。所以,例如:

Button myButton = new Button("Click");
myButton.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
grid.add(myButton, 0, 0);

SSCCE(使用行和列约束方法):

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.RowConstraints;
import javafx.stage.Stage;

public class KeyPad extends Application {

    @Override
    public void start(Stage primaryStage) {
        GridPane grid = new GridPane();
        int numRows = 4 ;
        int numColumns = 3 ;
        for (int row = 0 ; row < numRows ; row++ ){
            RowConstraints rc = new RowConstraints();
            rc.setFillHeight(true);
            rc.setVgrow(Priority.ALWAYS);
            grid.getRowConstraints().add(rc);
        }
        for (int col = 0 ; col < numColumns; col++ ) {
            ColumnConstraints cc = new ColumnConstraints();
            cc.setFillWidth(true);
            cc.setHgrow(Priority.ALWAYS);
            grid.getColumnConstraints().add(cc);
        }

        for (int i = 0 ; i < 9 ; i++) {
            Button button = createButton(Integer.toString(i+1));
            grid.add(button, i % 3, i / 3);
        }
        grid.add(createButton("#"), 0, 3);
        grid.add(createButton("0"), 1, 3);
        grid.add(createButton("*"), 2, 3);

        Scene scene = new Scene(grid);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private Button createButton(String text) {
        Button button = new Button(text);
        button.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
        button.setOnAction(e -> System.out.println(text));
        return button ;
    }

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

答案 1 :(得分:-4)

您可以在JavaFX中使用GridPane。在Java代码中,您可以通过

创建它
GridPane pane = new GridPane();

并向其添加不同的节点,例如

Label label = new Label();
pane.add(label, 0,0);

这将为GridPane的第一行和第一列添加标签。 对于更复杂的GUI,您可以使用SceneBuilder。