CEF Forum

I'm working on a minecraft mod that uses JCEF, but I ran into a problem, it requires me to use sendKeyEvent(KeyEvent).
Is there any way to call action keys, like backspaces, arrow keys, insert, etc. This is for windows 11 and macOS (intel)

This is the code for it currently this is in the CefBrowserOsr class in java

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@Override
    public void injectKeyTyped(int key, int mods) {
        KeyEvent ev = new KeyEvent(dc_, KeyEvent.KEY_TYPED, 0, mods, 0, (char) key);
        sendKeyEvent(ev);

here is the code for calling the native code.

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/**
     * Send a key event.
     * @param e The event to send.
     */
    protected final void sendKeyEvent(KeyEvent e) {
        try {
            N_SendKeyEvent(e);
        } catch (UnsatisfiedLinkError ule) {
            ule.printStackTrace();
        }
    }

Can someone anyone help me pls?

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KeyEvent ev = new KeyEvent(dc_, KeyEvent.KEY_TYPED, System.currentTimeMillis(), mods, KeyEvent.VK_UNDEFINED, (char) key);

...could work better. Make sure you have the browser on focus before trying to send key presses! (Please note that focus magic with CEF browsers has been a difficult task in the past and will most likely be buggy).

FriwiDev wrote:

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KeyEvent ev = new KeyEvent(dc_, KeyEvent.KEY_TYPED, System.currentTimeMillis(), mods, KeyEvent.VK_UNDEFINED, (char) key);

...could work better. Make sure you have the browser on focus before trying to send key presses! (Please note that focus magic with CEF browsers has been a difficult task in the past and will most likely be buggy).

Let me see if this works with arrow keys

backspace send an a with a ~ on top, arrow keys and every other action key isn't doing its thing. A-Z, a-z, and, 0-9 + some symbols are working

Can someone help me again pls!

You need to figure out the correct key codes for the arrow keys. You can find them by either searching them online, or debug printing them when receiving key presses on some awt component. Keycodes for the arrows are 37 to 40 (left, up, right, down). They can also be found in the constants KeyEvent.VK_LEFT, ...

ah ok but how do I send the action keys to the browser

Please use your favorite search engine to find this out way faster in the future. Your question is not really dependent on JCEF, as it applies to all swing components. You need to set the char value to KeyEvent.CHAR_UNDEFINED and change the KeyEvent.VK_UNSPECIFIED to the special key you want. For example KeyEvent.VK_LEFT.