通过Python中的Xlib找出鼠标按钮状态

时间:2019-03-04 23:03:52

标签: python linux cursor mouse xlib

我可以通过以下方式确定当前鼠标指针的位置:

from Xlib.display import Display
display = Display()
qp = display.screen().root.query_pointer()
print(qp.root_x, qp.root_y)

如何也通过Xlib来获得当前鼠标按钮的状态,例如左/右按钮的按下/释放? (或者,如果不可能,为什么不呢?)

2 个答案:

答案 0 :(得分:1)

您的X窗口必须支持XInput扩展名。 Real X可以使用,但是如果X服务器不支持VNC服务器等扩展名,则无法使用鼠标键。

如果X服务器支持它,则可以进入鼠标状态,如下所示:

from Xlib.display import Display
from Xlib.ext import xinput

display = Display()

import time

while True:
    buttons = []

    for device_info in display.xinput_query_device(xinput.AllDevices).devices:
        if not device_info.enabled:
            continue
        if xinput.ButtonClass not in [ device_class.type for device_class in device_info.classes ]:
            continue
        buttons.append(device_info)

    for button in buttons:
        for device_class in button.classes:
            if xinput.ButtonClass == device_class.type:
                if device_class.state[0]:
                    print('Device {name} - Primary button down'.format(name=button.name))
    time.sleep(1)

我不确定100%的位置,因为在任何地方都找不到文档,但是我很确定device_class.state [0]是主要的(向左键),1是中间的,2是右键。

您可能可以找到the button number assignment spec here

编辑:

为什么有两个for循环-首先,我在永远循环之外编写了“ buttons”部分。但是,“嘿,您可以随时插入鼠标。”

您会发现,有很多设备,包括“虚拟”设备。在笔记本电脑上,触摸板也可以用作按钮,因此在您的应用中,如果您想了解真正的鼠标按钮,则可能必须从名称中选择设备。同样,没有好的文档,因此您可能必须解密设备类对象。您可以在/usr/lib/python3/dist-packages/Xlib/ext/xinput.py中找到xinput。 (如果您使用的是Python2,请相应地进行调整。)祝您好运。

答案 1 :(得分:0)

您可以查看this python-xlib示例。

from __future__ import print_function

import sys
import os

# Change path so we find Xlib
sys.path.append(os.path.join(os.path.dirname(__file__), '..'))

from Xlib import X, XK, display
from Xlib.ext import record
from Xlib.protocol import rq

local_dpy = display.Display()
record_dpy = display.Display()


def lookup_keysym(keysym):
    for name in dir(XK):
        if name[:3] == "XK_" and getattr(XK, name) == keysym:
            return name[3:]
    return "[%d]" % keysym


def record_callback(reply):
    if reply.category != record.FromServer:
        return
    if reply.client_swapped:
        print("* received swapped protocol data, cowardly ignored")
        return
    if not len(reply.data) or reply.data[0] < 2:
        # not an event
        return

    data = reply.data
    while len(data):
        event, data = rq.EventField(None).parse_binary_value(
            data, record_dpy.display, None, None)

        if event.type in [X.KeyPress, X.KeyRelease]:
            pr = event.type == X.KeyPress and "Press" or "Release"

            keysym = local_dpy.keycode_to_keysym(event.detail, 0)
            if not keysym:
                print("KeyCode%s" % pr, event.detail)
            else:
                print("KeyStr%s" % pr, lookup_keysym(keysym))

            if event.type == X.KeyPress and keysym == XK.XK_Escape:
                local_dpy.record_disable_context(ctx)
                local_dpy.flush()
                return
        elif event.type == X.ButtonPress:
            print("ButtonPress", event.detail)
        elif event.type == X.ButtonRelease:
            print("ButtonRelease", event.detail)
        elif event.type == X.MotionNotify:
            print("MotionNotify", event.root_x, event.root_y)


# Check if the extension is present
if not record_dpy.has_extension("RECORD"):
    print("RECORD extension not found")
    sys.exit(1)
r = record_dpy.record_get_version(0, 0)
print("RECORD extension version %d.%d" % (r.major_version, r.minor_version))

# Create a recording context; we only want key and mouse events
ctx = record_dpy.record_create_context(
    0,
    [record.AllClients],
    [{
        'core_requests': (0, 0),
        'core_replies': (0, 0),
        'ext_requests': (0, 0, 0, 0),
        'ext_replies': (0, 0, 0, 0),
        'delivered_events': (0, 0),
        'device_events': (X.KeyPress, X.MotionNotify),
        'errors': (0, 0),
        'client_started': False,
        'client_died': False,
    }])

# Enable the context; this only returns after a call to record_disable_context,
# while calling the callback function in the meantime
record_dpy.record_enable_context(ctx, record_callback)

# Finally free the context
record_dpy.record_free_context(ctx)