/*

 * 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();

	}

}