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Introduction to JavaFX Dialogs
This document introduces JavaFX dialogs, including alert dialogs that return button types, text input dialogs that return input text, and choice dialogs that return selected items. It discusses creating and configuring dialogs, setting properties, showing dialogs modally or non-modally, and handling results. Tips are provided on resizing dialogs and creating simple dialog-based applications. In conclusion, dialogs represent modal windows in JavaFX and are shown using the showAndWait() method after configuration.
Introduction to JavaFX Dialogs
- 1. Introduction to JavaFX Dialogs HASUNUMAKenji k.hasunuma@coppermine.jp @khasunuma
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- 3. JavaFX Dialogs (8u40) •Alert - returns any ButtonType • TextInputDialog - returns input text • ChoiceDialog - returns choosen item • Dialog - superclass of all dialogs
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- 12. Dialog on code •Works instead of Stage. • Often, exists into a controller as a part of event procedures. • showAndWait() - show and wait, then returns a value as Optional<R>. • show() - show and wait, then returns no value.
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- 14. // Create adialog Alert alert = new Alert(INFORMATION); ! // Setting properties alert.setTitle("Title (INFORMATION)"); alert.setHeaderText("Header Text"); alert.setContentText("Content Text"); ! // Show and obtain the result Optional<ButtonType> result = alert.showAndWait(); ! // Another way if the result is needless // alert.show();
- 15. Result types Dialog Resulttype Alert ButtonType ! OK, CANCEL, CLOSE, APPLY, FINISH, YES, NO, NEXT, PREVIOUS TextInputDialog String ChoiceDialog Type of choosen item
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- 17. I want sucha dialog... How?
- 18. I want sucha dialog... How? // Add following code alert.setHeaderText(null);
- 19. /** * Tips #2:the way to resize a dialog. */ public class SomeController { @FXML public void onClick(ActionEvent event) { . . . Alert alert = new Alert(INFORMATION); // Using following methods to resize; // setPrefWidth, setPrefHeight and setPrefSize alert.getDialogPane().setPrefSize(400.0, 300.0); Optional<String> result = dialog.showAndWait(); /* Handle the result */ } }
- 20. /** * Tips #3:Simple dialog-based application. */ public class DialogApp extends Application { @Overrides public void start(Stage stage) throws Exception { TextInputDialog dialog = new TextInputDialog(); /* setting the dialog */ Optional<String> result = dialog.showAndWait(); /* handle the result */ } public static void main(String...args) { launch(args); } }
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- 22. • The representationof JavaFX dialogs are Dialog and their subclasses. • JavaFX Dialog looks like Stage, but is not Stage. • At first create and configure a dialog, and call showAndWait method.
- 23. Introduction to JavaFX Dialogs HASUNUMAKenji k.hasunuma@coppermine.jp @khasunuma