alsa-utils/alsamixer/widget.c

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/*
* widget.c - handles widget objects and the widget stack
* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
*
* 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 2 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 "aconfig.h"
#include <stdlib.h>
#include <term.h>
#include "die.h"
#include "widget.h"
int screen_lines;
int screen_cols;
static int cursor_visibility = -1;
static void widget_handle_key(int key)
{
}
static void update_cursor_visibility(void)
{
const struct widget *active_widget;
active_widget = get_active_widget();
if (active_widget &&
active_widget->cursor_visibility != cursor_visibility) {
cursor_visibility = active_widget->cursor_visibility;
curs_set(cursor_visibility);
}
}
void widget_init(struct widget *widget, int lines_, int cols, int y, int x,
chtype bkgd, unsigned int flags)
{
WINDOW *old_window;
if (y == SCREEN_CENTER)
y = (screen_lines - lines_) / 2;
if (x == SCREEN_CENTER)
x = (screen_cols - cols) / 2;
old_window = widget->window;
widget->window = newwin(lines_, cols, y, x);
if (!widget->window)
fatal_error("cannot create window");
keypad(widget->window, TRUE);
nodelay(widget->window, TRUE);
leaveok(widget->window, !(flags & WIDGET_CURSOR_VISIBLE));
wbkgdset(widget->window, bkgd);
werase(widget->window);
if (flags & WIDGET_BORDER)
box(widget->window, 0, 0);
if (flags & WIDGET_SUBWINDOW) {
if (widget->subwindow)
delwin(widget->subwindow);
widget->subwindow = derwin(widget->window,
lines_ - 2, cols - 2, 1, 1);
if (!widget->subwindow)
fatal_error("cannot create subwindow");
wbkgdset(widget->subwindow, bkgd);
}
widget->cursor_visibility = !!(flags & WIDGET_CURSOR_VISIBLE);
if (widget->panel) {
replace_panel(widget->panel, widget->window);
} else {
widget->panel = new_panel(widget->window);
if (!widget->panel)
fatal_error("cannot create panel");
set_panel_userptr(widget->panel, widget);
}
if (!widget->handle_key)
widget->handle_key = widget_handle_key;
if (old_window)
delwin(old_window);
update_cursor_visibility();
}
void widget_free(struct widget *widget)
{
if (widget->panel) {
del_panel(widget->panel);
widget->panel = NULL;
}
if (widget->subwindow) {
delwin(widget->subwindow);
widget->subwindow = NULL;
}
if (widget->window) {
delwin(widget->window);
widget->window = NULL;
}
update_cursor_visibility();
}
const struct widget *get_active_widget(void)
{
PANEL *active_panel;
active_panel = panel_below(NULL);
if (active_panel)
return panel_userptr(active_panel);
else
return NULL;
}
void window_size_changed(void)
{
PANEL *panel, *below;
const struct widget *widget;
getmaxyx(stdscr, screen_lines, screen_cols);
if (tigetflag("xenl") != 1 && tigetflag("am") != 1)
--screen_lines;
for (panel = panel_below(NULL); panel; panel = below) {
below = panel_below(panel);
widget = panel_userptr(panel);
widget->window_size_changed();
}
}