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livetrax/libs/clearlooks-newer/animation.c

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/* Clearlooks theme engine
*
* Copyright (C) 2006 Kulyk Nazar <schamane@myeburg.net>
* Copyright (C) 2006 Benjamin Berg <benjamin@sipsolutions.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
/* This code is responsible for the clearlooks animation support. The code
* works by forcing a redraw on the animated widget.
*/
#include "animation.h"
#ifdef HAVE_ANIMATION
#include <glib/gtimer.h>
struct _AnimationInfo {
GTimer *timer;
gdouble start_modifier;
gdouble stop_time;
GtkWidget *widget;
};
typedef struct _AnimationInfo AnimationInfo;
struct _SignalInfo {
GtkWidget *widget;
gulong handler_id;
};
typedef struct _SignalInfo SignalInfo;
static GSList *connected_widgets = NULL;
static GHashTable *animated_widgets = NULL;
static int animation_timer_id = 0;
static gboolean animation_timeout_handler (gpointer data);
/* This forces a redraw on a widget */
static void
force_widget_redraw (GtkWidget *widget)
{
if (GE_IS_PROGRESS_BAR (widget))
gtk_widget_queue_resize (widget);
else
gtk_widget_queue_draw (widget);
}
/* ensures that the timer is running */
static void
start_timer ()
{
if (animation_timer_id == 0)
animation_timer_id = g_timeout_add (ANIMATION_DELAY, animation_timeout_handler, NULL);
}
/* ensures that the timer is stopped */
static void
stop_timer ()
{
if (animation_timer_id != 0)
{
g_source_remove(animation_timer_id);
animation_timer_id = 0;
}
}
/* destroys an AnimationInfo structure including the GTimer */
static void
animation_info_destroy (AnimationInfo *animation_info)
{
g_timer_destroy (animation_info->timer);
g_free (animation_info);
}
/* This function does not unref the weak reference, because the object
* is beeing destroyed currently. */
static void
on_animated_widget_destruction (gpointer data, GObject *object)
{
/* steal the animation info from the hash table (destroying it would
* result in the weak reference to be unrefed, which does not work
* as the widget is already destroyed. */
g_hash_table_steal (animated_widgets, object);
animation_info_destroy ((AnimationInfo*) data);
}
/* This function also needs to unref the weak reference. */
static void
destroy_animation_info_and_weak_unref (gpointer data)
{
AnimationInfo *animation_info = data;
/* force a last redraw. This is so that if the animation is removed,
* the widget is left in a sane state. */
force_widget_redraw (animation_info->widget);
g_object_weak_unref (G_OBJECT (animation_info->widget), on_animated_widget_destruction, data);
animation_info_destroy (animation_info);
}
/* Find and return a pointer to the data linked to this widget, if it exists */
static AnimationInfo*
lookup_animation_info (const GtkWidget *widget)
{
if (animated_widgets)
return g_hash_table_lookup (animated_widgets, widget);
return NULL;
}
/* Create all the relevant information for the animation, and insert it into the hash table. */
static void
add_animation (const GtkWidget *widget, gdouble stop_time)
{
AnimationInfo *value;
/* object already in the list, do not add it twice */
if (lookup_animation_info (widget))
return;
if (animated_widgets == NULL)
animated_widgets = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, destroy_animation_info_and_weak_unref);
value = g_new(AnimationInfo, 1);
value->widget = (GtkWidget*) widget;
value->timer = g_timer_new ();
value->stop_time= stop_time;
value->start_modifier = 0.0;
g_object_weak_ref (G_OBJECT (widget), on_animated_widget_destruction, value);
g_hash_table_insert (animated_widgets, (GtkWidget*) widget, value);
start_timer ();
}
/* update the animation information for each widget. This will also queue a redraw
* and stop the animation if it is done. */
static gboolean
update_animation_info (gpointer key, gpointer value, gpointer user_data)
{
AnimationInfo *animation_info = value;
GtkWidget *widget = key;
g_assert ((widget != NULL) && (animation_info != NULL));
/* remove the widget from the hash table if it is not drawable */
if (!GTK_WIDGET_DRAWABLE (widget))
{
return TRUE;
}
if (GE_IS_PROGRESS_BAR (widget))
{
gfloat fraction = gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (widget));
/* stop animation for filled/not filled progress bars */
if (fraction <= 0.0 || fraction >= 1.0)
return TRUE;
}
force_widget_redraw (widget);
/* stop at stop_time */
if (animation_info->stop_time != 0 &&
g_timer_elapsed (animation_info->timer, NULL) > animation_info->stop_time)
return TRUE;
return FALSE;
}
/* This gets called by the glib main loop every once in a while. */
static gboolean
animation_timeout_handler (gpointer data)
{
/*g_print("** TICK **\n");*/
/* enter threads as update_animation_info will use gtk/gdk. */
gdk_threads_enter ();
g_hash_table_foreach_remove (animated_widgets, update_animation_info, NULL);
/* leave threads again */
gdk_threads_leave ();
if(g_hash_table_size(animated_widgets)==0)
{
stop_timer ();
return FALSE;
}
return TRUE;
}
static void
on_checkbox_toggle (GtkWidget *widget, gpointer data)
{
AnimationInfo *animation_info = lookup_animation_info (widget);
if (animation_info != NULL)
{
gfloat elapsed = g_timer_elapsed (animation_info->timer, NULL);
animation_info->start_modifier = elapsed - animation_info->start_modifier;
}
else
{
add_animation (widget, CHECK_ANIMATION_TIME);
}
}
static void
on_connected_widget_destruction (gpointer data, GObject *widget)
{
connected_widgets = g_slist_remove (connected_widgets, data);
g_free (data);
}
static void
disconnect_all_signals ()
{
GSList * item = connected_widgets;
while (item != NULL)
{
SignalInfo *signal_info = (SignalInfo*) item->data;
g_signal_handler_disconnect (signal_info->widget, signal_info->handler_id);
g_object_weak_unref (G_OBJECT (signal_info->widget), on_connected_widget_destruction, signal_info);
g_free (signal_info);
item = g_slist_next (item);
}
g_slist_free (connected_widgets);
connected_widgets = NULL;
}
/* helper function for clearlooks_animation_connect_checkbox */
static gint
find_signal_info (gconstpointer signal_info, gconstpointer widget)
{
if (((SignalInfo*)signal_info)->widget == widget)
return 0;
else
return 1;
}
/* external interface */
/* adds a progress bar */
void
clearlooks_animation_progressbar_add (GtkWidget *progressbar)
{
gdouble fraction = gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (progressbar));
if (fraction < 1.0 && fraction > 0.0)
add_animation ((GtkWidget*) progressbar, 0.0);
}
/* hooks up the signals for check and radio buttons */
void
clearlooks_animation_connect_checkbox (GtkWidget *widget)
{
if (GE_IS_CHECK_BUTTON (widget))
{
if (!g_slist_find_custom (connected_widgets, widget, find_signal_info))
{
SignalInfo * signal_info = g_new (SignalInfo, 1);
signal_info->widget = widget;
signal_info->handler_id = g_signal_connect ((GObject*)widget, "toggled", G_CALLBACK (on_checkbox_toggle), NULL);
connected_widgets = g_slist_append (connected_widgets, signal_info);
g_object_weak_ref (G_OBJECT (widget), on_connected_widget_destruction, signal_info);
}
}
}
/* returns TRUE if the widget is animated, and FALSE otherwise */
gboolean
clearlooks_animation_is_animated (GtkWidget *widget)
{
return lookup_animation_info (widget) != NULL ? TRUE : FALSE;
}
/* returns the elapsed time for the animation */
gdouble
clearlooks_animation_elapsed (gpointer data)
{
AnimationInfo *animation_info = lookup_animation_info (data);
if (animation_info)
return g_timer_elapsed (animation_info->timer, NULL)
- animation_info->start_modifier;
else
return 0.0;
}
/* cleans up all resources of the animation system */
void
clearlooks_animation_cleanup ()
{
disconnect_all_signals ();
if (animated_widgets != NULL)
{
g_hash_table_destroy (animated_widgets);
animated_widgets = NULL;
}
stop_timer ();
}
#else /* !HAVE_ANIMATION */
static void clearlooks_animation_dummy_function_so_wall_shuts_up_when_animations_is_disabled()
{
clearlooks_animation_dummy_function_so_wall_shuts_up_when_animations_is_disabled();
}
#endif /* HAVE_ANIMATION */