JavaFx：创建文本输入框

1 回答

• 0

  你有几个选择，但我会介绍其中一个 . 如果您只想在 TextInputDialog 而不是 TextField 中使用 TextArea ，则可以创建自己的类来为您提供 . 通过查看 TextInputDialog 的源代码，您可以看到它非常基本 .

  我在这里做的基本上是重复该类，而将 TextField 改为 TextArea 代替：

  TextFieldInputDialog.java

  import com.sun.javafx.scene.control.skin.resources.ControlResources;
  import javafx.application.Platform;
  import javafx.beans.NamedArg;
  import javafx.geometry.Pos;
  import javafx.scene.control.*;
  import javafx.scene.layout.GridPane;
  import javafx.scene.layout.Priority;
  
  /**
   * A dialog that shows a TextArea input
   */
  public class TextAreaInputDialog extends Dialog<String> {
  
      /**************************************************************************
       *
       * Fields
       *
       **************************************************************************/
  
      private final GridPane grid;
      private final TextArea textArea;
      private final String defaultValue;
  
      /**************************************************************************
       *
       * Constructors
       *
       **************************************************************************/
  
      /**
       * Creates a new TextInputDialog without a default value entered into the
       * dialog {@link TextField}.
       */
      public TextAreaInputDialog() {
          this("");
      }
  
      /**
       * Creates a new TextInputDialog with the default value entered into the
       * dialog {@link TextField}.
       */
      public TextAreaInputDialog(@NamedArg("defaultValue") String defaultValue) {
          final DialogPane dialogPane = getDialogPane();
  
          // -- textarea
          this.textArea = new TextArea(defaultValue);
          this.textArea.setMaxWidth(Double.MAX_VALUE);
          GridPane.setHgrow(textArea, Priority.ALWAYS);
          GridPane.setFillWidth(textArea, true);
  
          this.defaultValue = defaultValue;
  
          this.grid = new GridPane();
          this.grid.setHgap(10);
          this.grid.setMaxWidth(Double.MAX_VALUE);
          this.grid.setAlignment(Pos.CENTER_LEFT);
  
          dialogPane.contentTextProperty().addListener(o -> updateGrid());
  
          setTitle(ControlResources.getString("Dialog.confirm.title"));
          dialogPane.setHeaderText(ControlResources.getString("Dialog.confirm.header"));
          dialogPane.getStyleClass().add("text-input-dialog");
          dialogPane.getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);
  
          updateGrid();
  
          setResultConverter((dialogButton) -> {
              ButtonBar.ButtonData data = dialogButton == null ? null : dialogButton.getButtonData();
              return data == ButtonBar.ButtonData.OK_DONE ? textArea.getText() : null;
          });
      }
  
      /**************************************************************************
       *
       * Public API
       *
       **************************************************************************/
  
      /**
       * Returns the {@link TextField} used within this dialog.
       */
      public final TextArea getEditor() {
          return textArea;
      }
  
      /**
       * Returns the default value that was specified in the constructor.
       */
      public final String getDefaultValue() {
          return defaultValue;
      }
  
      /**************************************************************************
       *
       * Private Implementation
       *
       **************************************************************************/
  
      private void updateGrid() {
          grid.getChildren().clear();
  
          grid.add(textArea, 1, 0);
          getDialogPane().setContent(grid);
  
          Platform.runLater(() -> textArea.requestFocus());
      }
  }
  

  现在，您可以将该类放入项目中，并像使用其他任何 TextInputDialog 一样使用它 .

  这是一个使用它的简单应用程序：

  import javafx.application.Application;
  import javafx.geometry.Insets;
  import javafx.geometry.Pos;
  import javafx.scene.Scene;
  import javafx.scene.control.Button;
  import javafx.scene.layout.VBox;
  import javafx.stage.Stage;
  
  import java.util.Optional;
  
  public class TextInputPopup extends Application {
  
      public static void main(String[] args) {
          launch(args);
      }
  
      @Override
      public void start(Stage primaryStage) {
  
          // Simple interface
          VBox root = new VBox(5);
          root.setPadding(new Insets(10));
          root.setAlignment(Pos.CENTER);
  
          // Create a button to launch the input window
          Button button = new Button("Get input");
          button.setOnAction(e -> {
  
              // Create the new dialog
              TextAreaInputDialog dialog = new TextAreaInputDialog();
              dialog.setHeaderText(null);
              dialog.setGraphic(null);
  
              // Show the dialog and capture the result.
              Optional result = dialog.showAndWait();
  
              // If the "Okay" button was clicked, the result will contain our String in the get() method
              if (result.isPresent()) {
                  System.out.println(result.get());
              }
  
          });
  
          root.getChildren().add(button);
  
          // Show the Stage
          primaryStage.setWidth(300);
          primaryStage.setHeight(300);
          primaryStage.setScene(new Scene(root));
          primaryStage.show();
      }
  }
  

  ---

  肯定有进一步定制的空间，但也许这会引导您朝着正确的方向前进 .

  回复于 2024-04-28T15:11:55+08:00