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Get rid of the PANE_HIDDEN flag in favour of a function, and moving the
decision for whether or not a pane should be drawn out of the layout code and
into the redraw code.

This is needed for the new layout design, getting it in now to make that easier
to work on.

/* $OpenBSD: layout-manual.c,v 1.2 2009/07/14 07:23:36 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include "tmux.h"

void	layout_manual_v_update_offsets(struct window *);

void
layout_manual_v_refresh(struct window *w, unused int active_only)
{
	struct window_pane	*wp;
	u_int			 npanes, total, height;
	int			 left;

	if (active_only)
		return;

	if (TAILQ_EMPTY(&w->panes))
		return;

	/* Check the new size. */
	npanes = window_count_panes(w);
	if (w->sy <= PANE_MINIMUM * npanes) {
		/* 
		 * Make the first pane the smaller of the minimum and total (it
		 * must fit to be visible) and the rest the minimum size.
		 */
		height = PANE_MINIMUM;
		if (height > w->sy)
			height = w->sy + 1;
		TAILQ_FOREACH(wp, &w->panes, entry) {
			if (wp == TAILQ_FIRST(&w->panes))
				wp->sy = height - 1;
			else
				wp->sy = PANE_MINIMUM - 1;
		}
		/* And increase the first by the rest if possible. */
		if (w->sy >= PANE_MINIMUM)
			TAILQ_FIRST(&w->panes)->sy += 1 + w->sy % PANE_MINIMUM;
	} else {
		/* In theory they will all fit. Find the current total. */
		total = 0;
		TAILQ_FOREACH(wp, &w->panes, entry)
			total += wp->sy;
		total += npanes - 1;

		/* Growing or shrinking? */
		left = w->sy - total;
		if (left > 0) {
			/* Growing. Expand evenly. */
			while (left > 0) {
				TAILQ_FOREACH(wp, &w->panes, entry) {
					wp->sy++;
					if (--left == 0)
						break;
				}
			}
		} else {
			/* Shrinking. Reduce evenly down to minimum. */
			while (left < 0) {
				TAILQ_FOREACH(wp, &w->panes, entry) {
					if (wp->sy <= PANE_MINIMUM - 1)
						continue;
					wp->sy--;
					if (++left == 0)
						break;
				}
			}
		}
	}

	/* Now do the resize. */
	TAILQ_FOREACH(wp, &w->panes, entry) {
		wp->sy--;
	    	window_pane_resize(wp, w->sx, wp->sy + 1);
	}

	/* Fill in the offsets. */
	layout_manual_v_update_offsets(w);

	/* Switch the active window if necessary. */
	window_set_active_pane(w, w->active);
}

void
layout_manual_v_resize(struct window_pane *wp, int adjust)
{
	struct window		*w = wp->window;
	struct window_pane	*wq;

	if (adjust > 0) {
		/*
		 * If this is not the last pane, keep trying to increase size
		 * and remove it from the next panes. If it is the last, do
		 * so on the previous pane.
		 */
		if (TAILQ_NEXT(wp, entry) == NULL) {
			if (wp == TAILQ_FIRST(&w->panes)) {
				/* Only one pane. */
				return;
			}
			wp = TAILQ_PREV(wp, window_panes, entry);
		}
		while (adjust-- > 0) {
			wq = wp;
			while ((wq = TAILQ_NEXT(wq, entry)) != NULL) {
				if (wq->sy <= PANE_MINIMUM)
					continue;
				window_pane_resize(wq, wq->sx, wq->sy - 1);
				break;
			}
			if (wq == NULL)
				break;
			window_pane_resize(wp, wp->sx, wp->sy + 1);
		}
	} else {
		adjust = -adjust;
		/*
		 * If this is not the last pane, keep trying to reduce size
		 * and add to the following pane. If it is the last, do so on
		 * the previous pane.
		 */
		wq = TAILQ_NEXT(wp, entry);
		if (wq == NULL) {
			if (wp == TAILQ_FIRST(&w->panes)) {
				/* Only one pane. */
				return;
			}
			wq = wp;
			wp = TAILQ_PREV(wq, window_panes, entry);
		}
		while (adjust-- > 0) {
			if (wp->sy <= PANE_MINIMUM)
				break;
			window_pane_resize(wq, wq->sx, wq->sy + 1);
			window_pane_resize(wp, wp->sx, wp->sy - 1);
		}
	}

	layout_manual_v_update_offsets(w);
}

void
layout_manual_v_update_offsets(struct window *w)
{
	struct window_pane     *wp;
	u_int			yoff;

	yoff = 0;
	TAILQ_FOREACH(wp, &w->panes, entry) {
		wp->xoff = 0;
		wp->yoff = yoff;
		yoff += wp->sy + 1;
	}
}