On Thu, 5 Aug 2021 23:38:06 GMT, Thiago Milczarek Sayao <tsa...@openjdk.org>
wrote:
> Found the problem thru this path:
>
> **WindowStage.java**
>
> final void handleFocusDisabled() {
> if (activeWindows.isEmpty()) {
> return;
> }
> WindowStage window = activeWindows.get(activeWindows.size() - 1);
> window.setIconified(false);
> window.requestToFront();
> window.requestFocus();
> }
>
>
> **glass_window.cpp**
>
> void WindowContextBase::process_focus(GdkEventFocus* event) {
> ...
>
> if (jwindow) {
> if (!event->in || isEnabled()) {
> mainEnv->CallVoidMethod(jwindow, jWindowNotifyFocus,
> event->in ? com_sun_glass_events_WindowEvent_FOCUS_GAINED
> : com_sun_glass_events_WindowEvent_FOCUS_LOST);
> CHECK_JNI_EXCEPTION(mainEnv)
> } else {
> mainEnv->CallVoidMethod(jwindow, jWindowNotifyFocusDisabled);
> CHECK_JNI_EXCEPTION(mainEnv)
> }
> }
> }
>
>
> So `glass_window.cpp` was triggering `jWindowNotifyFocusDisabled` which
> triggered the java code on the Primary Stage (on the bug reproduce code).
>
> The docs states:
>
> /**
> * Enables or disables the window.
> *
> * A disabled window is unfocusable by definition.
> * Also, key or mouse events aren't generated for disabled windows.
> *
> * When a user tries to activate a disabled window, or the window gets
> * accidentally brought to the top of the stacking order, the window
> * generates the FOCUS_DISABLED window event. A Glass client should react
> * to this event and bring the currently active modal blocker of the
> * disabled window to top by calling blocker's minimize(false), toFront(),
> * and requestFocus() methods. It may also 'blink' the blocker window to
> * further attract user's attention.
> *
> .....
>
>
> So I guess the C++ side looks ok, java side on `handleFocusDisabled` I did
> not understand why it `requestToFront` and `requestFocus` on the latest
> window.
>
> The solution makes disabled windows unfocusable and prevents mouse and
> keyboard events as the docs states, making it compatible with other platforms.
I ran the testcase attached in JBS with the fix multiple times. I can still
reproduce the issue on Ubuntu 20.0 almost always, so the fix does not seem to
work for me.
-------------
PR: https://git.openjdk.java.net/jfx/pull/598
