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