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List:       openjdk-openjfx-dev
Subject:    Windows: Mnemonics Issue
From:       Abhinay Agarwal <abhinay_agarwal () live ! com>
Date:       2020-01-30 16:36:36
Message-ID: PS1PR03MB47000D3CB8BAAE566FF47589E7040 () PS1PR03MB4700 ! apcprd03 ! prod ! outlook ! com
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On Windows, mnemonics is activated when ALT is pressed. This is true for apps made in \
JavaFX.

However I have found the following discrepancy between Windows Native Apps and JavaFX \
apps:

In Windows, pressing any key(not assigned to mnemonics) in combination with ALT \
doesn't de-activates mnemonics. It is automatically deactivated when ALT is released. \
This can be reproduced in Notepad. However in JavaFX, pressing ALT activates \
mnemonics. If any key (not assinged to mnemonics) is pressed while ALT is being \
pressed, it deactivates mnemonics. This can lead to an unwanted state.

This can be tested by the following steps:

1. Open Notepad -> Type ALT + A. Nothing happens. Once ALT is released, mnemonics is \
de-activated on the MenuBar. 2. Run the attached JavaFX sample. Press ALT -> \
mnemonics activated. Press 'ALT + A' -> mnemonics activates and then de-activates. If \
you continue tapping 'A' (with ALT pressed), we can see that mnemonics are activated \
and deactivated. If we leave the mnemonics in activated state and try to enter text \
'F' in textfield, it will show the MenuItem(s) in the 'File' Menu.

Sample
=======


import javafx.application.Application;

import javafx.stage.Stage;

import javafx.scene.Scene;

import javafx.scene.control.Menu;

import javafx.scene.control.MenuBar;

import javafx.scene.control.MenuItem;

import javafx.scene.control.TextField;

import javafx.scene.layout.BorderPane;

public class MenuBarMnemonics extends Application {

    @Override

    public void start(Stage primaryStage) {

        BorderPane root = new BorderPane();

        MenuBar b = new MenuBar();

        Menu file = new Menu("_File");

        MenuItem fileTest = new MenuItem("Tes_t");

        file.getItems().add(fileTest);

        b.getMenus().add(file);

        Menu edit = new Menu("_Edit");

        MenuItem editTest = new MenuItem("Te_st");

        edit.getItems().add(editTest);

        b.getMenus().add(edit);

        root.setTop(b);

        root.setCenter(new TextField());

        Scene scene = new Scene(root,400,400);

        primaryStage.setScene(scene);

        primaryStage.show();

    }

}


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