/*
* (C) Copyright 2007 Bastien Nocera <hadess@hadess.net>
*
* Glow code from libwnck/libwnck/tasklist.c:
* Copyright © 2001 Havoc Pennington
* Copyright © 2003 Kim Woelders
* Copyright © 2003 Red Hat, Inc.
*
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <gtk/gtk.h>
#include "totem-glow-button.h"
#define FADE_OPACITY_DEFAULT 0.6
#define ENTER_SPEEDUP_RATIO 0.4
#define FADE_MAX_LOOPS 4
struct _TotemGlowButton {
GtkButton parent;
gdouble glow_start_time;
gdouble glow_factor;
guint button_glow;
guint glow : 1;
guint anim_enabled : 1;
guint pointer_entered : 1;
/* Set when we don't want to play animation
* anymore in pointer entered mode */
guint anim_finished :1;
};
static void totem_glow_button_set_timeout (TotemGlowButton *button, gboolean set_timeout);
static GtkButtonClass *parent_class;
G_DEFINE_TYPE (TotemGlowButton, totem_glow_button, GTK_TYPE_BUTTON);
static gboolean
totem_glow_button_glow (TotemGlowButton *button)
{
GtkWidget *buttonw;
GTimeVal tv;
gdouble now;
gfloat fade_opacity, loop_time;
buttonw = GTK_WIDGET (button);
if (gtk_widget_get_realized (buttonw) == FALSE)
return TRUE;
if (button->anim_enabled != FALSE) {
g_get_current_time (&tv);
now = (tv.tv_sec * (1.0 * G_USEC_PER_SEC) +
tv.tv_usec) / G_USEC_PER_SEC;
/* Hard-coded values */
fade_opacity = FADE_OPACITY_DEFAULT;
loop_time = 3.0;
if (button->glow_start_time <= G_MINDOUBLE) {
button->glow_start_time = now;
/* If the pointer entered, we want to start with 'dark' */
if (button->pointer_entered != FALSE) {
button->glow_start_time -= loop_time / 4.0;
}
}
/* Timing for mouse hover animation
[light]......[dark]......[light]......[dark]...
{mouse hover event}
[dark]..[light]..[dark]..[light]
{mouse leave event}
[light]......[dark]......[light]......[dark]
*/
if (button->pointer_entered != FALSE) {
/* pointer entered animation should be twice as fast */
loop_time *= ENTER_SPEEDUP_RATIO;
}
if ((now - button->glow_start_time) > loop_time * FADE_MAX_LOOPS) {
button->anim_finished = TRUE;
button->glow_factor = FADE_OPACITY_DEFAULT * 0.5;
} else {
button->glow_factor = fade_opacity * (0.5 - 0.5 * cos ((now - button->glow_start_time) * M_PI * 2.0 / loop_time));
}
} else {
button->glow_factor = FADE_OPACITY_DEFAULT * 0.5;
}
gtk_widget_queue_draw (GTK_WIDGET (button));
if (button->anim_finished != FALSE)
totem_glow_button_set_timeout (button, FALSE);
return button->anim_enabled;
}
static void
totem_glow_button_clear_glow_start_timeout_id (TotemGlowButton *button)
{
button->button_glow = 0;
}
static gboolean
totem_glow_button_draw (GtkWidget *widget,
cairo_t *cr,
gpointer user_data)
{
TotemGlowButton *button;
GtkStyleContext *context;
GtkAllocation allocation, child_allocation;
gint width, height;
GtkWidget *child;
GdkRGBA acolor;
button = TOTEM_GLOW_BUTTON (widget);
if (button->glow_factor == 0.0)
return FALSE;
context = gtk_widget_get_style_context (widget);
/* push a translucent overlay to paint to, so we can blend later */
cairo_push_group_with_content (cr, CAIRO_CONTENT_COLOR_ALPHA);
gtk_widget_get_allocation (widget, &allocation);
width = allocation.width;
height = allocation.height;
/* Draw a rectangle with bg[SELECTED] */
gtk_style_context_save (context);
gtk_style_context_add_class (context, "button");
gtk_style_context_set_state (context, GTK_STATE_SELECTED);
gtk_style_context_get_background_color (context, GTK_STATE_SELECTED, &acolor);
gdk_cairo_set_source_rgba (cr, &acolor);
gtk_render_background (context, cr, 0, 0, width, height);
gtk_style_context_restore (context);
/* then the image */
cairo_save (cr);
child = gtk_bin_get_child (GTK_BIN (button));
gtk_widget_get_allocation (child, &child_allocation);
cairo_translate (cr,
child_allocation.x - allocation.x,
child_allocation.y - allocation.y);
gtk_widget_draw (gtk_bin_get_child (GTK_BIN (button)), cr);
cairo_restore (cr);
/* finally blend it */
cairo_pop_group_to_source (cr);
cairo_paint_with_alpha (cr, button->glow_factor);
return FALSE;
}
static void
totem_glow_button_map (GtkWidget *buttonw)
{
TotemGlowButton *button;
(* GTK_WIDGET_CLASS (parent_class)->map) (buttonw);
button = TOTEM_GLOW_BUTTON (buttonw);
if (button->glow != FALSE && button->button_glow == 0) {
totem_glow_button_set_glow (button, TRUE);
}
}
static void
totem_glow_button_unmap (GtkWidget *buttonw)
{
TotemGlowButton *button;
button = TOTEM_GLOW_BUTTON (buttonw);
if (button->button_glow > 0) {
g_source_remove (button->button_glow);
button->button_glow = 0;
}
(* GTK_WIDGET_CLASS (parent_class)->unmap) (buttonw);
}
static void
totem_glow_button_enter (GtkButton *buttonw)
{
TotemGlowButton *button;
button = TOTEM_GLOW_BUTTON (buttonw);
(* GTK_BUTTON_CLASS (parent_class)->enter) (buttonw);
button->pointer_entered = TRUE;
button->anim_finished = FALSE;
button->glow_start_time = G_MINDOUBLE;
totem_glow_button_set_timeout (button, FALSE);
}
static void
totem_glow_button_leave (GtkButton *buttonw)
{
TotemGlowButton *button;
button = TOTEM_GLOW_BUTTON (buttonw);
(* GTK_BUTTON_CLASS (parent_class)->leave) (buttonw);
button->pointer_entered = FALSE;
button->glow_start_time = G_MINDOUBLE;
button->anim_finished = FALSE;
if (button->glow != FALSE)
totem_glow_button_set_timeout (button, TRUE);
}
static void
totem_glow_button_finalize (GObject *object)
{
TotemGlowButton *button = TOTEM_GLOW_BUTTON (object);
totem_glow_button_set_glow (button, FALSE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
totem_glow_button_class_init (TotemGlowButtonClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = totem_glow_button_finalize;
/* Note that we don't use a draw here because we
* want to modify what the button will draw by itself */
widget_class->map = totem_glow_button_map;
widget_class->unmap = totem_glow_button_unmap;
button_class->enter = totem_glow_button_enter;
button_class->leave = totem_glow_button_leave;
}
static void
totem_glow_button_init (TotemGlowButton *button)
{
button->glow_start_time = 0.0;
button->button_glow = 0;
button->glow_factor = 0.0;
g_signal_connect_object (button, "draw",
G_CALLBACK (totem_glow_button_draw),
G_OBJECT (button),
G_CONNECT_AFTER);
}
GtkWidget *
totem_glow_button_new (void)
{
return g_object_new (TOTEM_TYPE_GLOW_BUTTON, NULL);
}
/* We can only add a timeout once, we assert that, though
* calling it multiple times to disable the animation is fine */
static void
totem_glow_button_set_timeout (TotemGlowButton *button, gboolean set_timeout)
{
if (set_timeout != FALSE) {
if (button->button_glow > 0)
return;
button->glow_start_time = 0.0;
/* The animation doesn't speed up or slow down based on the
* timeout value, but instead will just appear smoother or
* choppier.
*/
button->button_glow =
g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
100,
(GSourceFunc) totem_glow_button_glow, button,
(GDestroyNotify) totem_glow_button_clear_glow_start_timeout_id);
} else {
if (button->button_glow > 0) {
g_source_remove (button->button_glow);
button->button_glow = 0;
}
button->glow_factor = 0.0;
gtk_widget_queue_draw (GTK_WIDGET (button));
}
}
void
totem_glow_button_set_glow (TotemGlowButton *button, gboolean glow)
{
GtkSettings *settings;
gboolean anim_enabled;
g_return_if_fail (TOTEM_IS_GLOW_BUTTON (button));
if (gtk_widget_get_mapped (GTK_WIDGET (button)) == FALSE
&& glow != FALSE) {
button->glow = glow;
return;
}
settings = gtk_settings_get_for_screen
(gtk_widget_get_screen (GTK_WIDGET (button)));
g_object_get (G_OBJECT (settings),
"gtk-enable-animations", &anim_enabled,
NULL);
button->anim_enabled = anim_enabled;
if (glow == FALSE && button->button_glow == 0 && button->anim_enabled != FALSE)
return;
if (glow != FALSE && button->button_glow != 0)
return;
button->glow = glow;
totem_glow_button_set_timeout (button, glow);
}
gboolean
totem_glow_button_get_glow (TotemGlowButton *button)
{
return button->glow != FALSE;
}
