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# Copyright (C) 2021 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# A TUI window implemented in Python that responds to, and displays,
# stop and exit events.
import gdb
# When an event arrives we ask the window to redraw itself. We should
# only do this if the window is valid. When this flag is true we
# perform the is_valid check. When this flag is false
perform_valid_check = True
update_title = False
cleanup_properly = False
# A global place into which we can write the window title.
titles_at_the_close = {}
class EventWindow:
def __init__(self, win):
self._win = win
self._count = 0
win.title = "This Is The Event Window"
self._stop_listener = lambda e: self._event("stop", e)
gdb.events.stop.connect(self._stop_listener)
self._exit_listener = lambda e: self._event("exit", e)
gdb.events.exited.connect(self._exit_listener)
self._events = []
# Ensure we can erase and write to the window from the
# constructor, the window should be valid by this point.
self._win.erase()
self._win.write("Hello world...")
def close(self):
global cleanup_properly
global titles_at_the_close
# Ensure that window properties can be read within the close method.
titles_at_the_close[self._win.title] = dict(
width=self._win.width, height=self._win.height
)
# The following calls are pretty pointless, but this ensures
# that we can erase and write to a window from the close
# method, the last moment a window should be valid.
self._win.erase()
self._win.write("Goodbye cruel world...")
if cleanup_properly:
# Disconnect the listeners and delete the lambda functions.
# This removes cyclic references to SELF, and so alows SELF to
# be deleted.
gdb.events.stop.disconnect(self._stop_listener)
gdb.events.exited.disconnect(self._exit_listener)
self._stop_listener = None
self._exit_listener = None
def _event(self, type, event):
global perform_valid_check
global update_title
self._count += 1
self._events.insert(0, type)
if not perform_valid_check or self._win.is_valid():
if update_title:
self._win.title = "This Is The Event Window (" + str(self._count) + ")"
else:
self.render()
def render(self):
self._win.erase()
w = self._win.width
h = self._win.height
for i in range(min(h, len(self._events))):
self._win.write(self._events[i] + "\n")
gdb.register_window_type("events", EventWindow)
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