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/* -*- mode: c; c-basic-offset: 4; -*-
*
* explorer-history.c - Implements a simple non-persistent history
* tracker. History items can be recorded immediately
* or on a timer. Each history item stores a timestamp,
* parameters, and a small thumbnail. They are made
* available to the user through a web-browser-like "Go" menu.
*
* Fyre - rendering and interactive exploration of chaotic functions
* Copyright (C) 2004-2006 David Trowbridge and Micah Dowty
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <config.h>
#include "explorer.h"
#include "histogram-imager.h"
/* These are stored in the history_queue. The parameter string and
* thumbnail are both owned by the history node.
*/
typedef struct {
GTimeVal timestamp; /* The time at which this node was created */
GdkPixbuf* thumbnail; /* Scaled-down version of the current histogram */
gchar* params; /* Serialized image parameters */
Explorer* explorer; /* For convenience in callbacks */
} HistoryNode;
struct delete_after_data {
GtkWidget *menu;
GtkWidget *separator;
gboolean triggered;
};
static void delete_after (GtkWidget *item, gpointer user_data);
static HistoryNode* history_node_new (HistogramImager* map);
static void history_node_apply (HistoryNode* self, HistogramImager* map);
static void history_node_free (HistoryNode* self);
static void on_go_back (GtkWidget *widget, Explorer *self);
static void on_go_forward (GtkWidget *widget, Explorer *self);
static void on_go_menu_show (GtkWidget *menu, Explorer *self);
static void on_go_menu_hide (GtkWidget *menu, Explorer *self);
static void on_go_menu_item (GtkWidget *menu, gpointer user_data);
static void on_change_notify (ParameterHolder *holder, GParamSpec* spec, Explorer *self);
static gboolean on_record_change (gpointer user_data);
static void explorer_append_history (Explorer* self, HistoryNode *node);
static void explorer_prune_history (Explorer* self, int max_nodes);
static void explorer_update_history_sensitivity (Explorer* self);
static gdouble timeval_subtract (GTimeVal *a, GTimeVal *b);
static gchar* explorer_strdup_time (GTimeVal *tv);
static void explorer_add_go_item (Explorer *self, GList *node_link);
static void explorer_cleanup_go_items (Explorer *self);
/************************************************************************************/
/***************************************************************** Public Methods ***/
/************************************************************************************/
void explorer_init_history(Explorer *self)
{
GtkWidget *menu = glade_xml_get_widget(self->xml, "go_menu_menu");
self->history_queue = g_queue_new();
/* Connect signal handlers
*/
glade_xml_signal_connect_data(self->xml, "on_go_back", G_CALLBACK(on_go_back), self);
glade_xml_signal_connect_data(self->xml, "on_go_forward", G_CALLBACK(on_go_forward), self);
g_signal_connect (self->map, "notify", G_CALLBACK(on_change_notify), self);
g_signal_connect (menu, "show", G_CALLBACK(on_go_menu_show), self);
g_signal_connect (menu, "hide", G_CALLBACK(on_go_menu_hide), self);
}
void explorer_dispose_history(Explorer *self)
{
if (self->history_timer) {
g_source_remove(self->history_timer);
self->history_timer = 0;
}
if (self->history_queue) {
explorer_prune_history(self, 0);
g_queue_free(self->history_queue);
self->history_queue = NULL;
}
}
/************************************************************************************/
/****************************************************************** History Nodes ***/
/************************************************************************************/
static HistoryNode* history_node_new (HistogramImager* map)
{
HistoryNode* self = g_new0(HistoryNode, 1);
gint width, height;
g_get_current_time(&self->timestamp);
self->params = parameter_holder_save_string(PARAMETER_HOLDER(map));
/* Use the normal icon size plus a little extra */
gtk_icon_size_lookup(GTK_ICON_SIZE_MENU, &width, &height);
width *= 1.75;
height *= 1.75;
self->thumbnail = histogram_imager_make_thumbnail(map, width, height);
return self;
}
static void history_node_apply (HistoryNode* self, HistogramImager* map)
{
parameter_holder_load_string(PARAMETER_HOLDER(map), self->params);
}
static void history_node_free (HistoryNode* self)
{
if (self->thumbnail) {
gdk_pixbuf_unref(self->thumbnail);
self->thumbnail = NULL;
}
if (self->params) {
g_free(self->params);
self->params = NULL;
}
g_free(self);
}
/************************************************************************************/
/******************************************************************** History Queue */
/************************************************************************************/
static void explorer_append_history (Explorer* self, HistoryNode *node)
{
node->explorer = self;
g_queue_push_tail(self->history_queue, node);
/* Seems like a reasonable length... */
explorer_prune_history(self, 128);
/* Our new node is now the current one for back/forward navigation */
self->history_current_link = g_queue_peek_tail_link(self->history_queue);
explorer_update_history_sensitivity(self);
}
static void explorer_prune_history (Explorer* self, int max_nodes)
{
while (self->history_queue->length > max_nodes) {
GList* link = g_queue_pop_head_link(self->history_queue);
if (!link)
break;
if (link == self->history_current_link)
self->history_current_link = NULL;
history_node_free(link->data);
g_list_free_1(link);
}
}
static void explorer_update_history_sensitivity (Explorer* self)
{
gtk_widget_set_sensitive(glade_xml_get_widget(self->xml, "go_forward"),
self->history_current_link && self->history_current_link->next);
gtk_widget_set_sensitive(glade_xml_get_widget(self->xml, "go_back"),
self->history_current_link && self->history_current_link->prev);
}
/************************************************************************************/
/******************************************************************* Time Utilities */
/************************************************************************************/
static gdouble timeval_subtract(GTimeVal *a, GTimeVal *b)
{
return (a->tv_sec - b->tv_sec) +
(a->tv_usec - b->tv_usec) / 1000000.0;
}
static gchar* explorer_strdup_time (GTimeVal *tv)
{
double units;
GTimeVal now;
g_get_current_time(&now);
units = timeval_subtract(&now, tv);
if (units < 120.0)
return g_strdup_printf("%.01f seconds ago", units);
units /= 60.0;
if (units < 120.0)
return g_strdup_printf("%.01f minutes ago", units);
units /= 60.0;
if (units < 120.0)
return g_strdup_printf("%.02f hours ago", units);
units /= 24.0;
return g_strdup_printf("%.02f days ago", units);
}
/************************************************************************************/
/***************************************************************** Menu Maintenance */
/************************************************************************************/
static void explorer_add_go_item (Explorer *self, GList *node_link)
{
GtkWidget *menu = glade_xml_get_widget(self->xml, "go_menu_menu");
HistoryNode *node = node_link->data;
GtkWidget *item, *image;
gchar* label;
/* Add the timestamp */
label = explorer_strdup_time(&node->timestamp);
item = gtk_image_menu_item_new_with_label(label);
g_free(label);
/* Add the thumbnail */
image = gtk_image_new_from_pixbuf(node->thumbnail);
gtk_image_menu_item_set_image(GTK_IMAGE_MENU_ITEM(item), image);
/* Set up a callback to activate this node.
* Note that its data is our node_link, not the Explorer.
*/
g_signal_connect(item, "activate", G_CALLBACK(on_go_menu_item), node_link);
/* Add it to the menu */
gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
gtk_widget_show(item);
}
static void delete_after (GtkWidget *item, gpointer user_data)
{
struct delete_after_data *data = (struct delete_after_data*) user_data;
if (item == data->separator)
data->triggered = TRUE;
else if (data->triggered)
gtk_container_remove(GTK_CONTAINER(data->menu), item);
}
static void explorer_cleanup_go_items (Explorer *self)
{
/* Remove all items in the 'go' menu after our marked separator
*/
GtkWidget *menu = glade_xml_get_widget(self->xml, "go_menu_menu");
struct delete_after_data data;
data.menu = menu;
data.separator = glade_xml_get_widget(self->xml, "history_separator");
data.triggered = FALSE;
gtk_container_foreach(GTK_CONTAINER(menu), delete_after, &data);
}
/************************************************************************************/
/******************************************************************** GUI Callbacks */
/************************************************************************************/
static void on_go_back (GtkWidget *widget, Explorer *self)
{
self->history_current_link = self->history_current_link->prev;
explorer_update_history_sensitivity(self);
self->history_freeze = TRUE;
history_node_apply(self->history_current_link->data, HISTOGRAM_IMAGER(self->map));
self->history_freeze = FALSE;
}
static void on_go_forward (GtkWidget *widget, Explorer *self)
{
self->history_current_link = self->history_current_link->next;
explorer_update_history_sensitivity(self);
self->history_freeze = TRUE;
history_node_apply(self->history_current_link->data, HISTOGRAM_IMAGER(self->map));
self->history_freeze = FALSE;
}
static void on_go_menu_show (GtkWidget *menu, Explorer *self)
{
const int max_linear_items = 4;
const int max_scaled_items = 10;
int i, num_scaled_items;
GList *current;
gdouble t_total, t;
GTimeVal *scaled_reference;
HistoryNode* node;
explorer_cleanup_go_items(self);
/* If our queue is empty, add a new record immediately. This
* will prevent us from getting an empty 'go' menu right after
* startup- instead it will have a thumbnail of our defaults
* or whatever image the user happened to load. This can't
* go in our initialization above since that happens before
* we've actually rendered anything. Putting it here is more
* reliable than using a timer.
*/
if (self->history_queue->length < 1)
explorer_append_history(self, history_node_new(HISTOGRAM_IMAGER(self->map)));
/* The first few items are straight from the most recent list */
current = g_queue_peek_tail_link(self->history_queue);
for (i=0; i<max_linear_items; i++) {
if (!current)
return;
explorer_add_go_item(self, current);
current = current->prev;
}
/* The rest of the list is spread evenly over time, from the end
* of the above section back to the oldest history we have.
*/
if (!current)
return;
node = current->data;
scaled_reference = &node->timestamp;
t_total = timeval_subtract(scaled_reference,
&((HistoryNode*)g_queue_peek_head(self->history_queue))->timestamp);
num_scaled_items = MIN(self->history_queue->length - max_linear_items,
max_scaled_items);
if (num_scaled_items <= 0)
return;
for (i=0; i<num_scaled_items; i++) {
/* For each item on the scaled_items list, find the
* node at the proper position in time.
*/
while (1) {
if (!current)
return;
node = current->data;
t = timeval_subtract(scaled_reference, &node->timestamp);
if (t > (i*t_total/num_scaled_items))
break;
current = current->prev;
}
explorer_add_go_item(self, current);
}
}
static void on_go_menu_hide (GtkWidget *menu, Explorer *self)
{
explorer_cleanup_go_items(self);
}
static void on_go_menu_item (GtkWidget *menu, gpointer user_data)
{
GList *link = user_data;
HistoryNode *node = link->data;
Explorer *self = node->explorer;
self->history_current_link = link;
explorer_update_history_sensitivity(self);
self->history_freeze = TRUE;
history_node_apply(self->history_current_link->data, HISTOGRAM_IMAGER(self->map));
self->history_freeze = FALSE;
}
static void on_change_notify (ParameterHolder *holder, GParamSpec* spec, Explorer *self)
{
/* In a history_freeze, we don't record changes automatically */
if (self->history_freeze)
return;
/* Set a timer to record this change if no others occur
* immediately afterwards. This consolidates periods of
* very rapid movement.
*/
if (self->history_timer) {
g_source_remove(self->history_timer);
self->history_timer = 0;
}
self->history_timer = g_timeout_add(150, on_record_change, self);
}
static gboolean on_record_change (gpointer user_data)
{
Explorer* self = EXPLORER(user_data);
explorer_append_history(self, history_node_new(HISTOGRAM_IMAGER(self->map)));
self->history_timer = 0;
return FALSE;
}
/* The End */
|