You could try a lower level, grabbing the key down and key up events.
Something like this:
RootPanel.get().addDomHandler(event -> {
handleKeyEvent(event.getNativeKeyCode(), true);
event.preventDefault();
event.stopPropagation();
}, KeyDownEvent.getType());
RootPanel.get().addDomHandler(event -> {
handleKeyEvent(event.getNativeKeyCode(), false);
event.preventDefault();
event.stopPropagation();
}, KeyUpEvent.getType());
private void handleKeyEvent(int keyCode, boolean isDown) {
if (keyCode == KeyCodes.KEY_ALT) {
altKeyDown = isDown;
}
}
On Thursday, 12 December 2024 at 10:18:49 am UTC+11 Jens wrote:
> Usually you want to use the "key" property of the event as it is
> independent of the physical location of the key. It contains the printable
> character if the keyboard key produces one. If it doesn't it contains a
> description like "shift".
>
> Depending on how international you have to be, you might also want to
> think about keyboards that have two layouts: one with latin characters and
> one with non-latin characters (arabic, ..). These keyboards usually have a
> key to switch between both layouts and the layout with latin characters
> usually matches the standard English keyboard layout, but it doesn't have
> to. If you don't want to force your users to switch to latin mode before
> using a keyboard shortcut you would need to detect if the "key" property
> contains a non-latin character and if it does you should check "code"
> instead of "key" property. You would use the "code" of the English layout,
> assuming that the chance is high that the latin layout is indeed the
> standard English layout.
>
> If you only support Chromium based browsers you can use the Keyboard API:
> https://developer.mozilla.org/en-US/docs/Web/API/Keyboard_API
>
> -- J.
>
> Venky schrieb am Mittwoch, 11. Dezember 2024 um 22:38:11 UTC+1:
>
>> Hey community,
>>
>> I am working on a project where I want to introduce a keyboard shortcut
>> for a particular action.
>>
>> private void shortcutKeyHandler() {
>> Event.addNativePreviewHandler(new Event.NativePreviewHandler() {
>> @Override
>> public void onPreviewNativeEvent(Event.NativePreviewEvent event) {
>> NativeEvent nativeEvent = event.getNativeEvent();
>> if (event.getTypeInt() == Event.ONKEYDOWN &&
>> nativeEvent.getAltKey() && nativeEvent.getKeyCode() == 191 &&
>> !db.isShowing()) {
>> nativeEvent.preventDefault();
>> execute();
>> }
>> }
>> });
>> }
>>
>> In the code, I implemented a shortcut (Alt + /) to display a dialog box.
>> While it works well with English keyboard layouts, the problem arises with
>> other layouts where the Slash key (keycode 191) generates a different
>> keycode.
>>
>> Is there some workaround with the help of JSNI?
>>
>> I would greatly appreciate any help in determining how to check the
>> character code and verify if the Alt key is pressed.
>>
>> Thanks in advance
>>
>
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