Question

我需要在运行时更改多个按钮的文本。就像这样，Change text for multiple buttons in one operation，但在JavaFX中。

Answer 1

一个非常简单的解决方案是迭代GridPane的子项列表，如果它们是Button的实例，则对它们进行操作：

colorPicker.setOnAction(e -> {
   ObservableList<Node> children = gridPane.getChildren();
   for (Node child : children) {
       if (child instanceof Button) {
          // Do something
       }
   }
});

Answer 2

要更改颜色（您在要做的注释中指明的颜色），可以使用CSS。

如果您为主GridPane提供grid的ID，则以下CSS将使网格中的所有按钮（直接后代或后代的后代等）具有基本颜色白色（背景颜色，以及“悬停颜色”和“压制颜色”源自基色）：

#grid {
    -sudoku-button-color: white ;
}

#grid .button {
    -fx-base: -sudoku-button-color ;
}

现在在控制器中，您需要做的就是切换颜色：

grid.setStyle("-sudoku-button-color: ... ;");

以一些可接受的CSS格式传递新颜色。

如果要为每个按钮设置文本，则需要遍历按钮并依次设置每个文本。如果将按钮放在数组中，这将变得更容易。请注意，您可以通过在数独网格中为“块”定义FXML并在主网格中包含9个此类块来进一步避免重复。

以下演示了所有这些技巧：

sudoku.css：

#grid {
    -sudoku-button-color: white ;
    -fx-padding: 2 ;
}

.sudoku-block {
    -fx-padding: 2 ;
    -fx-border-color: black ;
}

#grid .button {
    -fx-base: -sudoku-button-color ;
    -fx-max-width: Infinity ;
    -fx-max-height: Infinity ;
}

SudokuBlock.fxml：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>

<GridPane styleClass="sudoku-block" xmlns:fx="http://javafx.com/fxml/1" fx:controller="BlockController">
    <Button fx:id="button0" GridPane.columnIndex="0" GridPane.rowIndex="0" />
    <Button fx:id="button1" GridPane.columnIndex="1" GridPane.rowIndex="0" />
    <Button fx:id="button2" GridPane.columnIndex="2" GridPane.rowIndex="0" />
    <Button fx:id="button3" GridPane.columnIndex="0" GridPane.rowIndex="1" />
    <Button fx:id="button4" GridPane.columnIndex="1" GridPane.rowIndex="1" />
    <Button fx:id="button5" GridPane.columnIndex="2" GridPane.rowIndex="1" />
    <Button fx:id="button6" GridPane.columnIndex="0" GridPane.rowIndex="2" />
    <Button fx:id="button7" GridPane.columnIndex="1" GridPane.rowIndex="2" />
    <Button fx:id="button8" GridPane.columnIndex="2" GridPane.rowIndex="2" />
</GridPane>

BlockController.java：

import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;

public class BlockController {

    @FXML
    private Button button0 ;
    @FXML
    private Button button1 ;
    @FXML
    private Button button2 ;
    @FXML
    private Button button3 ;
    @FXML
    private Button button4 ;
    @FXML
    private Button button5 ;
    @FXML
    private Button button6 ;
    @FXML
    private Button button7 ;
    @FXML
    private Button button8 ;

    private Button[][] buttons ;

    public void initialize() {
        buttons = new Button[][]{
                { button0, button1, button2 },
                { button3, button4, button5 },
                { button6, button7, button8 }
        };
        for (Button[] buttonRow : buttons) {
            for (Button button : buttonRow) {
                GridPane.setFillHeight(button, true);
                GridPane.setFillWidth(button, true);
            }
        }
    }

    public void setButtonText(int column, int row, String text) {
        buttons[column][row].setText(text);
    }
}

SudokuGrid.fxml：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ColorPicker?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.GridPane?>


<BorderPane xmlns:fx="http://javafx.com/fxml/1" fx:controller="SudokuController" >

    <top>
        <ColorPicker fx:id="colorPicker" onAction="#changeColor" />
    </top>

    <center>

        <GridPane fx:id="grid" id="grid">
            <fx:include source="SudokuBlock.fxml" fx:id="block0" GridPane.columnIndex="0" GridPane.rowIndex="0" />
            <fx:include source="SudokuBlock.fxml" fx:id="block1" GridPane.columnIndex="1" GridPane.rowIndex="0" />
            <fx:include source="SudokuBlock.fxml" fx:id="block2" GridPane.columnIndex="2" GridPane.rowIndex="0" />
            <fx:include source="SudokuBlock.fxml" fx:id="block3" GridPane.columnIndex="0" GridPane.rowIndex="1" />
            <fx:include source="SudokuBlock.fxml" fx:id="block4" GridPane.columnIndex="1" GridPane.rowIndex="1" />
            <fx:include source="SudokuBlock.fxml" fx:id="block5" GridPane.columnIndex="2" GridPane.rowIndex="1" />
            <fx:include source="SudokuBlock.fxml" fx:id="block6" GridPane.columnIndex="0" GridPane.rowIndex="2" />
            <fx:include source="SudokuBlock.fxml" fx:id="block7" GridPane.columnIndex="1" GridPane.rowIndex="2" />
            <fx:include source="SudokuBlock.fxml" fx:id="block8" GridPane.columnIndex="2" GridPane.rowIndex="2" />
        </GridPane>

    </center>
</BorderPane>

SudokuController.java：

import javafx.fxml.FXML;
import javafx.scene.control.ColorPicker;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;

public class SudokuController {


    @FXML
    private ColorPicker colorPicker ;
    @FXML
    private GridPane grid ;
    @FXML
    private BlockController block0Controller ;
    @FXML
    private BlockController block1Controller ;
    @FXML
    private BlockController block2Controller ;
    @FXML
    private BlockController block3Controller ;
    @FXML
    private BlockController block4Controller ;
    @FXML
    private BlockController block5Controller ;
    @FXML
    private BlockController block6Controller ;
    @FXML
    private BlockController block7Controller ;
    @FXML
    private BlockController block8Controller ;

    private BlockController[][] blocks ;

    public void initialize() {
        blocks = new BlockController[][] {
            { block0Controller, block1Controller, block2Controller },
            { block3Controller, block4Controller, block5Controller },
            { block6Controller, block7Controller, block8Controller }            
        };

        for (int blockColumn = 0 ; blockColumn < 3 ; blockColumn++) {
            for (int blockRow = 0 ; blockRow < 3 ; blockRow++) {

                for (int columnInBlock = 0 ; columnInBlock < 3 ; columnInBlock++) {
                    for (int rowInBlock = 0 ; rowInBlock < 3 ; rowInBlock++) {

                        int column = blockColumn * 3 + columnInBlock ;
                        int row = blockRow * 3 + rowInBlock ;

                        String text = String.format("[%d, %d]", column, row);

                        blocks[blockColumn][blockRow].setButtonText(columnInBlock, rowInBlock, text);

                    }
                }

            }
        }
    }

    @FXML
    private void changeColor() {
        Color color = colorPicker.getValue();
        int r = (int) (255 * color.getRed());
        int g = (int) (255 * color.getGreen());
        int b = (int) (255 * color.getBlue());
        String formattedColor = String.format("#%02x%02x%02x", r, g, b);
        grid.setStyle("-sudoku-button-color: "+formattedColor+";");


    }
}

最后是应用程序类Sudoku.java：

import java.io.IOException;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Sudoku extends Application {

    @Override
    public void start(Stage primaryStage) throws IOException {
        Scene scene = new Scene(FXMLLoader.load(getClass().getResource("SudokuGrid.fxml")));
        scene.getStylesheets().add("sudoku.css");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

截图：

JavaFX在一个操作中更改多个按钮的文本

2 个答案: