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binutils-gdb/gdb/tui/tui-command.c
Tom Tromey 45bbae5c4b Remove flickering from the TUI
In some cases, the TUI flickers when redrawing.  This can be seen
mostly easily when switching layouts.

This patch fixes the problem by exploiting the double buffering that
curses already does.  In some spots, the TUI will now disable flushing
the curses buffers to the screen; and then flush them all at once when
the rendering is complete.

gdb/ChangeLog
2020-01-19  Tom Tromey  <tom@tromey.com>

	* tui/tui.c (tui_show_assembly): Use tui_suppress_output.
	* tui/tui-wingeneral.h (class tui_suppress_output): New.
	(tui_wrefresh): Declare.
	* tui/tui-wingeneral.c (suppress_output): New global.
	(tui_suppress_output, ~tui_suppress_output): New constructor and
	destructor.
	(tui_wrefresh): New function.
	(tui_gen_win_info::refresh_window): Use tui_wrefresh.
	(tui_gen_win_info::make_window): Call wnoutrefresh when needed.
	* tui/tui-regs.h (struct tui_data_window) <no_refresh>: Declare
	method.
	* tui/tui-regs.c (tui_data_window::erase_data_content): Call
	tui_wrefresh.
	(tui_data_window::no_refresh): New method.
	(tui_data_item_window::refresh_window): Call tui_wrefresh.
	(tui_reg_command): Use tui_suppress_output
	* tui/tui-layout.c (tui_set_layout): Use tui_suppress_output.
	* tui/tui-data.h (struct tui_gen_win_info) <no_refresh>: New
	method.
	* tui/tui-command.c (tui_refresh_cmd_win): Call tui_wrefresh.

Change-Id: Icb832ae100b861de3af3307488e636fa928d5c9f
2020-01-19 13:08:49 -07:00

80 lines
2.1 KiB
C

/* Specific command window processing.
Copyright (C) 1998-2020 Free Software Foundation, Inc.
Contributed by Hewlett-Packard Company.
This file is part of GDB.
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/>. */
#include "defs.h"
#include "tui/tui.h"
#include "tui/tui-data.h"
#include "tui/tui-win.h"
#include "tui/tui-io.h"
#include "tui/tui-command.h"
#include "tui/tui-wingeneral.h"
#include "gdb_curses.h"
/* See tui-command.h. */
int
tui_cmd_window::max_height () const
{
return tui_term_height () - 4;
}
void
tui_cmd_window::resize (int height_, int width_, int origin_x, int origin_y)
{
width = width_;
height = height_;
x = origin_x;
y = origin_y;
if (handle == nullptr)
make_window ();
else
{
/* Another reason we don't call the base class method here is
that for the command window in particular, we want to avoid
destroying the underlying handle. We don't currently track
the contents of this window, and so have no way to re-render
it. However we can at least move it and keep the old size if
wresize isn't available. */
#ifdef HAVE_WRESIZE
wresize (handle.get (), height, width);
#endif
mvwin (handle.get (), y, x);
wmove (handle.get (), 0, 0);
}
}
/* See tui-command.h. */
void
tui_refresh_cmd_win (void)
{
WINDOW *w = TUI_CMD_WIN->handle.get ();
tui_wrefresh (w);
/* FIXME: It's not clear why this is here.
It was present in the original tui_puts code and is kept in order to
not introduce some subtle breakage. */
fflush (stdout);
}