您需要在Scene 上注册几个监听器来监听按下的按键。
获得密钥后，您可以使用 JavaFX 的 PseudoClass 选择器更新每个 Button 的 pressed 样式。
可能有更简化的方法来执行此操作，但这是我的实现。这是一个完整的示例，您可以尝试查看它的实际效果。
请注意，我没有实现计算器的实际功能。
最后的结果/截图在最后。
Main.java：
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.IOException;
public class Main extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("MainLayout.fxml"));
Scene scene = new Scene(loader.load());
scene.getStylesheets().add("style.css");
primaryStage.setScene(scene);
primaryStage.setTitle("Calculator");
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
}
MainLayout.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<VBox alignment="TOP_CENTER" spacing="10.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1"
fx:controller="UI.BaseApps.Calculator.MainController">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>
</padding>
<children>
<TextField fx:id="txtDisplay" disable="true" alignment="CENTER_RIGHT" editable="false" minHeight="-Infinity"
prefHeight="50.0" text="0"/>
<GridPane hgap="10.0" vgap="10.0" VBox.vgrow="ALWAYS">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="-Infinity"/>
<ColumnConstraints hgrow="SOMETIMES" minWidth="-Infinity"/>
<ColumnConstraints hgrow="SOMETIMES" minWidth="-Infinity"/>
<ColumnConstraints hgrow="NEVER" minWidth="-Infinity"/>
<ColumnConstraints hgrow="SOMETIMES" minWidth="-Infinity"/>
<ColumnConstraints hgrow="SOMETIMES" minWidth="-Infinity"/>
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="-Infinity" vgrow="SOMETIMES"/>
<RowConstraints minHeight="-Infinity" vgrow="SOMETIMES"/>
<RowConstraints minHeight="-Infinity" vgrow="SOMETIMES"/>
<RowConstraints minHeight="-Infinity" vgrow="SOMETIMES"/>
</rowConstraints>
<children>
<Button fx:id="btn7" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="7"/>
<Button fx:id="btn8" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="8" GridPane.columnIndex="1"/>
<Button fx:id="btn9" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="9" GridPane.columnIndex="2"/>
<Separator orientation="VERTICAL" prefHeight="200.0" GridPane.columnIndex="3" GridPane.rowSpan="4"/>
<Button fx:id="btnDivide" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="÷" GridPane.columnIndex="4"/>
<Button fx:id="btnClear" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="C" GridPane.columnIndex="5"/>
<Button fx:id="btn4" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="4" GridPane.rowIndex="1"/>
<Button fx:id="btn5" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="5" GridPane.columnIndex="1"
GridPane.rowIndex="1"/>
<Button fx:id="btn6" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="6" GridPane.columnIndex="2"
GridPane.rowIndex="1"/>
<Button fx:id="btnMultiply" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="x" GridPane.columnIndex="4"
GridPane.rowIndex="1"/>
<Button fx:id="btn1" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="1" GridPane.rowIndex="2"/>
<Button fx:id="btn2" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="2" GridPane.columnIndex="1"
GridPane.rowIndex="2"/>
<Button fx:id="btn3" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="3" GridPane.columnIndex="2"
GridPane.rowIndex="2"/>
<Button fx:id="btn0" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" text="0" GridPane.columnSpan="2"
GridPane.rowIndex="3"/>
<Button fx:id="btnDecimal" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="." GridPane.columnIndex="2"
GridPane.rowIndex="3"/>
<Button fx:id="btnSubtract" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="-" GridPane.columnIndex="4"
GridPane.rowIndex="2"/>
<Button fx:id="btnAdd" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="+" GridPane.columnIndex="4"
GridPane.rowIndex="3"/>
<Button fx:id="btnEquals" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="="
GridPane.columnIndex="5" GridPane.rowIndex="2" GridPane.rowSpan="2"/>
<Button fx:id="btnBackspace" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308"
mnemonicParsing="false" prefHeight="50.0" prefWidth="50.0" text="←" GridPane.columnIndex="5"
GridPane.rowIndex="1"/>
</children>
</GridPane>
</children>
</VBox>
MainController.java：
import javafx.application.Platform;
import javafx.css.PseudoClass;
import javafx.fxml.FXML;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyCode;
public class MainController {
// Here we'll define our PseudoClass needed to set the style for each pressed Button
private static final PseudoClass PRESSED = PseudoClass.getPseudoClass("pressed");
// Define FXML controls
@FXML
private TextField txtDisplay;
@FXML
private Button btn7, btn8, btn9;
@FXML
private Button btn4, btn5, btn6;
@FXML
private Button btn1, btn2, btn3;
@FXML
private Button btn0, btnDecimal;
@FXML
private Button btnMultiply, btnSubtract, btnAdd, btnDivide;
@FXML
private Button btnClear, btnEquals, btnBackspace;
@FXML
private void initialize() {
// We need access to the Scene to register our key listeners, so we need to wrap the code in a Platform.runLater(). If we try to do this without Platform.runLater(), we'll get a NullPointerException because txtDisplay hasn't been rendered yet.
Platform.runLater(() -> {
Scene scene = txtDisplay.getScene();
// Add a listener to capture any key that is pressed. We add this to the entire scene and we can then change the style of the corresponding button accordingly.
scene.setOnKeyPressed(event -> {
// We need to know which Button we're working with
Button button = getButton(event.getCode());
// Add our "pressed" style to the Button
if (button != null) button.pseudoClassStateChanged(PRESSED, true);
});
// Once the user releases the key, remove our custom style and trigger whatever onAction() code has been applied to the corresponding Button.
scene.setOnKeyReleased(event -> {
Button button = getButton(event.getCode());
if (button != null) {
button.pseudoClassStateChanged(PRESSED, false);
// Fire the button's onAction()
button.fire();
}
});
});
}
// Helper method to get the Button that corresponds to the pressed key. The Scene.setOnKeyPressed() listener provides the KeyCode for the pressed key. We can use that to determine which of our Buttons to trigger.
private Button getButton(KeyCode keyCode) {
switch (keyCode) {
case NUMPAD0: return btn0;
case NUMPAD1: return btn1;
case NUMPAD2: return btn2;
case NUMPAD3: return btn3;
case NUMPAD4: return btn4;
case NUMPAD5: return btn5;
case NUMPAD6: return btn6;
case NUMPAD7: return btn7;
case NUMPAD8: return btn8;
case NUMPAD9: return btn9;
case DECIMAL: return btnDecimal;
case DIVIDE: return btnDivide;
case ADD: return btnAdd;
case MULTIPLY: return btnMultiply;
case SUBTRACT: return btnSubtract;
case ENTER: return btnEquals;
case BACK_SPACE: return btnBackspace;
case ESCAPE: return btnClear;
}
return null;
}
}
style.css：
.text-field {
-fx-opacity: 1.0;
-fx-font-family: Consolas;
-fx-font-size: 200%;
}
.button {
-fx-font-family: Consolas;
-fx-font-size: 150%;
-fx-background-radius: 25px;
-fx-border-radius: 25px;
/* Remove focus highlighting */
-fx-focus-traversable: false;
}
.button:pressed {
-fx-background-color: lightgreen;
-fx-border-color: green;
}
结果如下：