an issue with clear buffer

[mohammadkarami2023]

I have used termqt in a tab inside a qdialog. whenever i reopen the dialog i use terminal.clear_buffer() to clear the screen but after some tries i get the following errors:
Traceback (most recent call last):

File ~/.local/lib/python3.8/site-packages/termqt/terminal_widget.py:658 in resize
self.resize(self.size().width(), self.size().height())

File ~/.local/lib/python3.8/site-packages/termqt/terminal_widget.py:451 in resize
self._save_cursor_state_stop_blinking()

File ~/.local/lib/python3.8/site-packages/termqt/terminal_widget.py:527 in _save_cursor_state_stop_blinking
self._switch_cursor_blink(CursorState.ON, False)

File ~/.local/lib/python3.8/site-packages/termqt/terminal_widget.py:522 in _switch_cursor_blink
self._paint_cursor()

File ~/.local/lib/python3.8/site-packages/termqt/terminal_widget.py:416 in _paint_cursor
c = self._buffer[ind_y][chr_x]

IndexError: deque index out of range

QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::setPen: Painter not active
QPainter::setFont: Painter not active

[TerryGeng]

This is a good catch. paint_cursor doesn't check if the cursor is in the valid buffer region. I posted a quick fix #27. Would you please confirm it solves this bug?

On the other hand, I would suggest you reset the cursor position to (0, 0) after clearing the buffer to avoid the cursor position surprising you.

[mohammadkarami2023]

thanks, clear buffer now works. another issue happens when the initial command fails. i get the following:
Traceback (most recent call last):

File ~/.local/lib/python3.8/site-packages/termqt/terminal_widget.py:545 in _stdout
need_draw = self._stdout_string(string)

File ~/.local/lib/python3.8/site-packages/termqt/terminal_buffer.py:1378 in _stdout_string
self.write_at_cursor(tst_buf)

File ~/.local/lib/python3.8/site-packages/termqt/terminal_buffer.py:1051 in write_at_cursor
self.write(text, pos=None, set_cursor=True, reset_offset=False)

File ~/.local/lib/python3.8/site-packages/termqt/terminal_buffer.py:1027 in write
buf[pos_y][pos_x] = t

IndexError: list assignment index out of range

[mohammadkarami2023]

I also modified the last lines of start.py to test the functionality of clear_buffer. no exceptions happens but in the terminal the current dir is shown twice.

    terminal_io.stdout_callback = terminal.stdout
    terminal.stdin_callback = terminal_io.write
    terminal.resize_callback = terminal_io.resize
    terminal_io.spawn()
    terminal.clear_buffer()
    terminal_io.terminate()
    terminal_io.spawn()
    terminal.set_cursor_position(0, 0)
    terminal.clear_buffer()
    terminal.set_cursor_position(0, 0)
    sys.exit(app.exec())

Terminal looks like

mohammad@mypc:~/Downloads/termqt-240fda2253750944cc922b329ce2d72318de1b78$mohammad@mypc:~/Downloads/termqt-240fda2253750944cc922b329ce2d72318de1b78$

[TerryGeng]

Great to know!

Thanks again!

[TerryGeng]

Regarding the new issue of lines being displayed twice, I would think it is an issue with the shell itself (since the shell doesn't know the buffer is cleared). I may look into it a bit more today.

[mohammadkarami2023]

Thanks, another problem is with command top. the output not shows the apps running

[mohammadkarami2023]

oh i realized that there is no problem with command top but the font is black similar to the background.
also is there anyway to change the background of the widget?

[TerryGeng]

Why the foreground color is black in your case? I believe the default color is white. Can you investigate this?

[mohammadkarami2023]

my foreground is white. when i execute top command in the bash, the summary of my resources are shown as white, but the processes have black font color

[mohammadkarami2023]

it seems that the lines that get updated have black foreground color. in my case even the upper lines after a while become black as shown in the following pictures

[TerryGeng]

I see. The issue is caused by the broken support for some escape sequences. I have pushed a new commit to #27. Would you have a look?