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A case where next_event () get stuck when grabbing the pointer #159

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FSpark opened this issue Feb 3, 2020 · 0 comments
Open

A case where next_event () get stuck when grabbing the pointer #159

FSpark opened this issue Feb 3, 2020 · 0 comments

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@FSpark
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@FSpark FSpark commented Feb 3, 2020

When I grab the mouse event, there is an unexpected situation that it will get stuck in next_event (), so that no subsequent messages can be obtained.

It's very easy to reproduce.
Now I'll simplify this part of the code as follows:

from Xlib.display import Display
from Xlib import X
def handle(event):
    if event.type == X.MotionNotify:
        print("MotionNotify", event.root_x, event.root_y)

disp = Display()
root = disp.screen().root

root.grab_pointer(True,
                  X.ButtonPressMask |
                  X.ButtonReleaseMask |
                  X.PointerMotionMask,
                  X.GrabModeAsync,
                  X.GrabModeAsync,
                  0, 0, X.CurrentTime)

while 1:
    event = disp.next_event()
    handle(event)
    disp.allow_events(X.AsyncPointer, X.CurrentTime)

You can try to run this program when you press the left or right mouse button and hold it still. Any event in the program will not be grabbed or displayed.

It's beyond my ability... Is there anything recommended for debugging?

Many thanks in advance
@FSpark FSpark changed the title A case where next_event () will get stuck when grabbing the pointer A case where next_event () get stuck when grabbing the pointer Feb 3, 2020
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