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/*
* \/\/\
*
* Copyright (C) 2012-2018 Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* 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/>.
*/
/* contexts (this is derived from desktops) */
#include <assert.h>
#include <X11/Xlib.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"
#include "context.h"
#include "desktop.h"
#include "vwm.h"
#include "xwindow.h"
/* make the specified context the most recently used one */
vwm_context_t * vwm_context_mru(vwm_t *vwm, vwm_context_t *context)
{
VWM_TRACE("MRU context: %p", context);
list_move(&context->contexts_mru, &vwm->contexts_mru);
return context;
}
/* return next MRU context relative to the supplied context */
vwm_context_t * vwm_context_next_mru(vwm_t *vwm, vwm_context_t *context, vwm_direction_t direction)
{
list_head_t *next;
switch (direction) {
case VWM_DIRECTION_FORWARD:
if (context->contexts_mru.next == &vwm->contexts_mru) {
next = context->contexts_mru.next->next;
} else {
next = context->contexts_mru.next;
}
break;
case VWM_DIRECTION_REVERSE:
if (context->contexts_mru.prev == &vwm->contexts_mru) {
next = context->contexts_mru.prev->prev;
} else {
next = context->contexts_mru.prev;
}
break;
default:
assert(0);
}
return list_entry(next, vwm_context_t, contexts_mru);
}
/* return next context spatially relative to the supplied context, no wrap-around */
vwm_context_t * vwm_context_next(vwm_t *vwm, vwm_context_t *context, vwm_direction_t direction)
{
switch (direction) {
case VWM_DIRECTION_FORWARD:
if (context->contexts.next != &vwm->contexts)
context = list_entry(context->contexts.next, vwm_context_t, contexts);
break;
case VWM_DIRECTION_REVERSE:
if (context->contexts.prev != &vwm->contexts)
context = list_entry(context->contexts.prev, vwm_context_t, contexts);
break;
}
return context;
}
/* helper for automatically assigning context colors */
static int next_context_color_idx(vwm_t *vwm)
{
int counts[VWM_CONTEXT_COLOR_MAX] = {};
vwm_context_t *context;
int color = 0;
/* TODO: contexts should probably keep a window count,
* so this could skip empty contexts, then those
* would be automatically recycled.
*/
list_for_each_entry(context, &vwm->contexts, contexts)
counts[context->color]++;
for (int i = 0; i < NELEMS(counts); i++) {
if (counts[i] < counts[color])
color = i;
}
return color;
}
/* create a context */
/* if color = -1 one is automatically assigned,
* otherwise the supplied color is used.
*/
vwm_context_t * vwm_context_create(vwm_t *vwm, int color, vwm_desktop_t *desktop)
{
vwm_context_t *context;
context = calloc(1, sizeof(vwm_context_t));
if (context == NULL) {
VWM_PERROR("Failed to allocate context");
goto _fail;
}
if (color < 0)
color = next_context_color_idx(vwm);
assert(color < NELEMS(vwm->context_colors));
context->color = color;
list_add_tail(&context->contexts, &vwm->contexts);
list_add_tail(&context->contexts_mru, &vwm->contexts_mru);
if (!desktop)
desktop = vwm_desktop_create(vwm, context);
context->focused_desktop = desktop;
return context;
_fail:
return NULL;
}
/* destroy a context */
void vwm_context_destroy(vwm_t *vwm, vwm_context_t *context)
{
/* silently refuse to destroy a context having windows (for now) */
/* there's _always_ a focused window on a context having mapped windows */
if (context->focused_desktop && context->focused_desktop->focused_window)
return;
/* also silently refuse to destroy the last context (for now) */
if (context->contexts.next == context->contexts.prev)
return;
list_del(&context->contexts);
list_del(&context->contexts_mru);
}
/* find a context by color, creating one if needed */
vwm_context_t * vwm_context_by_color(vwm_t *vwm, unsigned color)
{
vwm_context_t *context;
list_for_each_entry(context, &vwm->contexts, contexts) {
if (context->color == color)
return context;
}
return vwm_context_create(vwm, color, NULL);
}
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