/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-scroll-bar.c: Scroll bar actor
*
* Copyright 2008 OpenedHand
* Copyright 2008, 2009 Intel Corporation.
* Copyright 2009, 2010 Red Hat, Inc.
* Copyright 2010 Maxim Ermilov
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* SECTION:st-scroll-bar
* @short_description: a user interface element to control scrollable areas.
*
* The #StScrollBar allows users to scroll scrollable actors, either by
* the step or page amount, or by manually dragging the handle.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <clutter/clutter.h>
#include "st-scroll-bar.h"
#include "st-bin.h"
#include "st-enum-types.h"
#include "st-private.h"
#include "st-button.h"
#define PAGING_INITIAL_REPEAT_TIMEOUT 500
#define PAGING_SUBSEQUENT_REPEAT_TIMEOUT 200
typedef struct _StScrollBarPrivate StScrollBarPrivate;
struct _StScrollBarPrivate
{
StAdjustment *adjustment;
gboolean grabbed;
gfloat x_origin;
gfloat y_origin;
ClutterActor *trough;
ClutterActor *handle;
gfloat move_x;
gfloat move_y;
/* Trough-click handling. */
enum { NONE, UP, DOWN } paging_direction;
guint paging_source_id;
guint paging_event_no;
ClutterAnimation *paging_animation;
guint vertical : 1;
};
G_DEFINE_TYPE_WITH_PRIVATE (StScrollBar, st_scroll_bar, ST_TYPE_WIDGET)
#define ST_SCROLL_BAR_PRIVATE(sb) st_scroll_bar_get_instance_private (ST_SCROLL_BAR (sb))
enum
{
PROP_0,
PROP_ADJUSTMENT,
PROP_VERTICAL
};
enum
{
SCROLL_START,
SCROLL_STOP,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0, };
extern gfloat st_slow_down_factor;
static gboolean
handle_button_press_event_cb (ClutterActor *actor,
ClutterButtonEvent *event,
StScrollBar *bar);
static void stop_scrolling (StScrollBar *bar);
static void
st_scroll_bar_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
StScrollBarPrivate *priv = ST_SCROLL_BAR_PRIVATE (gobject);
switch (prop_id)
{
case PROP_ADJUSTMENT:
g_value_set_object (value, priv->adjustment);
break;
case PROP_VERTICAL:
g_value_set_boolean (value, priv->vertical);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
st_scroll_bar_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
StScrollBar *bar = ST_SCROLL_BAR (gobject);
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
switch (prop_id)
{
case PROP_ADJUSTMENT:
st_scroll_bar_set_adjustment (bar, g_value_get_object (value));
break;
case PROP_VERTICAL:
priv->vertical = g_value_get_boolean (value);
if (priv->vertical)
clutter_actor_set_name (CLUTTER_ACTOR (priv->handle),
"vhandle");
else
clutter_actor_set_name (CLUTTER_ACTOR (priv->handle),
"hhandle");
clutter_actor_queue_relayout ((ClutterActor*) gobject);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
st_scroll_bar_dispose (GObject *gobject)
{
StScrollBar *bar = ST_SCROLL_BAR (gobject);
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
if (priv->adjustment)
st_scroll_bar_set_adjustment (bar, NULL);
if (priv->handle)
{
clutter_actor_destroy (priv->handle);
priv->handle = NULL;
}
if (priv->trough)
{
clutter_actor_destroy (priv->trough);
priv->trough = NULL;
}
G_OBJECT_CLASS (st_scroll_bar_parent_class)->dispose (gobject);
}
static void
st_scroll_bar_unmap (ClutterActor *actor)
{
CLUTTER_ACTOR_CLASS (st_scroll_bar_parent_class)->unmap (actor);
stop_scrolling (ST_SCROLL_BAR (actor));
}
static void
scroll_bar_allocate_children (StScrollBar *bar,
const ClutterActorBox *box,
ClutterAllocationFlags flags)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (bar));
ClutterActorBox content_box, trough_box;
st_theme_node_get_content_box (theme_node, box, &content_box);
if (priv->vertical)
{
trough_box.x1 = content_box.x1;
trough_box.y1 = content_box.y1;
trough_box.x2 = content_box.x2;
trough_box.y2 = content_box.y2;
clutter_actor_allocate (priv->trough, &trough_box, flags);
}
else
{
trough_box.x1 = content_box.x1;
trough_box.y1 = content_box.y1;
trough_box.x2 = content_box.x2;
trough_box.y2 = content_box.y2;
clutter_actor_allocate (priv->trough, &trough_box, flags);
}
if (priv->adjustment)
{
float handle_size, position, avail_size;
gdouble value, lower, upper, page_size, increment, min_size, max_size;
ClutterActorBox handle_box = { 0, };
st_adjustment_get_values (priv->adjustment,
&value,
&lower,
&upper,
NULL,
NULL,
&page_size);
if ((upper == lower)
|| (page_size >= (upper - lower)))
increment = 1.0;
else
increment = page_size / (upper - lower);
min_size = 32.;
st_theme_node_lookup_length (theme_node, "min-size", FALSE, &min_size);
max_size = G_MAXINT16;
st_theme_node_lookup_length (theme_node, "max-size", FALSE, &max_size);
if (upper - lower - page_size <= 0)
position = 0;
else
position = (value - lower) / (upper - lower - page_size);
if (priv->vertical)
{
avail_size = content_box.y2 - content_box.y1;
handle_size = increment * avail_size;
handle_size = CLAMP (handle_size, min_size, max_size);
handle_box.x1 = content_box.x1;
handle_box.y1 = content_box.y1 + position * (avail_size - handle_size);
handle_box.x2 = content_box.x2;
handle_box.y2 = handle_box.y1 + handle_size;
}
else
{
avail_size = content_box.x2 - content_box.x1;
handle_size = increment * avail_size;
handle_size = CLAMP (handle_size, min_size, max_size);
handle_box.x1 = content_box.x1 + position * (avail_size - handle_size);
handle_box.y1 = content_box.y1;
handle_box.x2 = handle_box.x1 + handle_size;
handle_box.y2 = content_box.y2;
}
clutter_actor_allocate (priv->handle,
&handle_box,
flags);
}
}
static void
st_scroll_bar_get_preferred_width (ClutterActor *self,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
StScrollBar *bar = ST_SCROLL_BAR (self);
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
gfloat trough_min_width, trough_natural_width;
gfloat handle_min_width, handle_natural_width;
st_theme_node_adjust_for_height (theme_node, &for_height);
_st_actor_get_preferred_width (priv->trough, for_height, TRUE,
&trough_min_width, &trough_natural_width);
_st_actor_get_preferred_width (priv->handle, for_height, TRUE,
&handle_min_width, &handle_natural_width);
if (priv->vertical)
{
if (min_width_p)
*min_width_p = MAX (trough_min_width, handle_min_width);
if (natural_width_p)
*natural_width_p = MAX (trough_natural_width, handle_natural_width);
}
else
{
if (min_width_p)
*min_width_p = trough_min_width + handle_min_width;
if (natural_width_p)
*natural_width_p = trough_natural_width + handle_natural_width;
}
st_theme_node_adjust_preferred_width (theme_node, min_width_p, natural_width_p);
}
static void
st_scroll_bar_get_preferred_height (ClutterActor *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
StScrollBar *bar = ST_SCROLL_BAR (self);
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
gfloat trough_min_height, trough_natural_height;
gfloat handle_min_height, handle_natural_height;
st_theme_node_adjust_for_width (theme_node, &for_width);
_st_actor_get_preferred_height (priv->trough, for_width, TRUE,
&trough_min_height, &trough_natural_height);
_st_actor_get_preferred_height (priv->handle, for_width, TRUE,
&handle_min_height, &handle_natural_height);
if (priv->vertical)
{
if (min_height_p)
*min_height_p = trough_min_height + handle_min_height;
if (natural_height_p)
*natural_height_p = trough_natural_height + handle_natural_height;
}
else
{
if (min_height_p)
*min_height_p = MAX (trough_min_height, handle_min_height);
if (natural_height_p)
*natural_height_p = MAX (trough_natural_height, handle_natural_height);
}
st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
}
static void
st_scroll_bar_allocate (ClutterActor *actor,
const ClutterActorBox *box,
ClutterAllocationFlags flags)
{
StScrollBar *bar = ST_SCROLL_BAR (actor);
clutter_actor_set_allocation (actor, box, flags);
scroll_bar_allocate_children (bar, box, flags);
}
static void
scroll_bar_update_positions (StScrollBar *bar)
{
ClutterActorBox box;
/* Due to a change in the adjustments, we need to reposition our
* children; since adjustments changes can come from allocation
* changes in the scrolled area, we can't just queue a new relayout -
* we may already be in a relayout cycle. On the other hand, if
* a relayout is already queued, we can't just go ahead and allocate
* our children, since we don't have a valid allocation, and calling
* clutter_actor_get_allocation_box() will trigger an immediate
* stage relayout. So what we do is go ahead and immediately
* allocate our children if we already have a valid allocation, and
* otherwise just wait for the queued relayout.
*/
if (!clutter_actor_has_allocation (CLUTTER_ACTOR (bar)))
return;
clutter_actor_get_allocation_box (CLUTTER_ACTOR (bar), &box);
scroll_bar_allocate_children (bar, &box, CLUTTER_ALLOCATION_NONE);
}
static void
st_scroll_bar_style_changed (StWidget *widget)
{
StScrollBarPrivate *priv = ST_SCROLL_BAR_PRIVATE (widget);
st_widget_style_changed (ST_WIDGET (priv->trough));
st_widget_style_changed (ST_WIDGET (priv->handle));
ST_WIDGET_CLASS (st_scroll_bar_parent_class)->style_changed (widget);
}
static void
bar_reactive_notify_cb (GObject *gobject,
GParamSpec *arg1,
gpointer user_data)
{
StScrollBar *bar = ST_SCROLL_BAR (gobject);
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
clutter_actor_set_reactive (priv->handle,
clutter_actor_get_reactive (CLUTTER_ACTOR (bar)));
}
static GObject*
st_scroll_bar_constructor (GType type,
guint n_properties,
GObjectConstructParam *properties)
{
GObjectClass *gobject_class;
GObject *obj;
StScrollBar *bar;
gobject_class = G_OBJECT_CLASS (st_scroll_bar_parent_class);
obj = gobject_class->constructor (type, n_properties, properties);
bar = ST_SCROLL_BAR (obj);
g_signal_connect (bar, "notify::reactive",
G_CALLBACK (bar_reactive_notify_cb), NULL);
return obj;
}
static void
adjust_with_direction (StAdjustment *adj,
ClutterScrollDirection direction)
{
gdouble delta;
switch (direction)
{
case CLUTTER_SCROLL_UP:
case CLUTTER_SCROLL_LEFT:
delta = -1.0;
break;
case CLUTTER_SCROLL_RIGHT:
case CLUTTER_SCROLL_DOWN:
delta = 1.0;
break;
case CLUTTER_SCROLL_SMOOTH:
default:
g_assert_not_reached ();
break;
}
st_adjustment_adjust_for_scroll_event (adj, delta);
}
static gboolean
st_scroll_bar_scroll_event (ClutterActor *actor,
ClutterScrollEvent *event)
{
StScrollBarPrivate *priv = ST_SCROLL_BAR_PRIVATE (actor);
if (clutter_event_is_pointer_emulated ((ClutterEvent *) event))
return TRUE;
switch (event->direction)
{
case CLUTTER_SCROLL_SMOOTH:
{
gdouble delta_x, delta_y;
clutter_event_get_scroll_delta ((ClutterEvent *)event, &delta_x, &delta_y);
if (priv->vertical)
st_adjustment_adjust_for_scroll_event (priv->adjustment, delta_y);
else
st_adjustment_adjust_for_scroll_event (priv->adjustment, delta_x);
}
break;
case CLUTTER_SCROLL_UP:
case CLUTTER_SCROLL_DOWN:
case CLUTTER_SCROLL_LEFT:
case CLUTTER_SCROLL_RIGHT:
adjust_with_direction (priv->adjustment, event->direction);
break;
default:
g_return_val_if_reached (FALSE);
break;
}
return TRUE;
}
static void
st_scroll_bar_class_init (StScrollBarClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
StWidgetClass *widget_class = ST_WIDGET_CLASS (klass);
GParamSpec *pspec;
object_class->get_property = st_scroll_bar_get_property;
object_class->set_property = st_scroll_bar_set_property;
object_class->dispose = st_scroll_bar_dispose;
object_class->constructor = st_scroll_bar_constructor;
actor_class->get_preferred_width = st_scroll_bar_get_preferred_width;
actor_class->get_preferred_height = st_scroll_bar_get_preferred_height;
actor_class->allocate = st_scroll_bar_allocate;
actor_class->scroll_event = st_scroll_bar_scroll_event;
actor_class->unmap = st_scroll_bar_unmap;
widget_class->style_changed = st_scroll_bar_style_changed;
g_object_class_install_property
(object_class,
PROP_ADJUSTMENT,
g_param_spec_object ("adjustment",
"Adjustment",
"The adjustment",
ST_TYPE_ADJUSTMENT,
ST_PARAM_READWRITE));
pspec = g_param_spec_boolean ("vertical",
"Vertical Orientation",
"Vertical Orientation",
FALSE,
ST_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_VERTICAL, pspec);
signals[SCROLL_START] =
g_signal_new ("scroll-start",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (StScrollBarClass, scroll_start),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
signals[SCROLL_STOP] =
g_signal_new ("scroll-stop",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (StScrollBarClass, scroll_stop),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
static void
move_slider (StScrollBar *bar,
gfloat x,
gfloat y)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
gdouble position, lower, upper, page_size;
gfloat ux, uy, pos, size;
if (!priv->adjustment)
return;
if (!clutter_actor_transform_stage_point (priv->trough, x, y, &ux, &uy))
return;
if (priv->vertical)
size = clutter_actor_get_height (priv->trough)
- clutter_actor_get_height (priv->handle);
else
size = clutter_actor_get_width (priv->trough)
- clutter_actor_get_width (priv->handle);
if (size == 0)
return;
if (priv->vertical)
pos = uy - priv->y_origin;
else
pos = ux - priv->x_origin;
pos = CLAMP (pos, 0, size);
st_adjustment_get_values (priv->adjustment,
NULL,
&lower,
&upper,
NULL,
NULL,
&page_size);
position = ((pos / size)
* (upper - lower - page_size))
+ lower;
st_adjustment_set_value (priv->adjustment, position);
}
static void
stop_scrolling (StScrollBar *bar)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
if (!priv->grabbed)
return;
st_widget_remove_style_pseudo_class (ST_WIDGET (priv->handle), "active");
clutter_ungrab_pointer ();
priv->grabbed = FALSE;
g_signal_emit (bar, signals[SCROLL_STOP], 0);
}
static gboolean
handle_motion_event_cb (ClutterActor *trough,
ClutterMotionEvent *event,
StScrollBar *bar)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
if (!priv->grabbed)
return FALSE;
move_slider (bar, event->x, event->y);
return TRUE;
}
static gboolean
handle_button_release_event_cb (ClutterActor *trough,
ClutterButtonEvent *event,
StScrollBar *bar)
{
if (event->button != 1)
return FALSE;
stop_scrolling (bar);
return TRUE;
}
static gboolean
handle_button_press_event_cb (ClutterActor *actor,
ClutterButtonEvent *event,
StScrollBar *bar)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (bar);
if (event->button != 1)
return FALSE;
if (!clutter_actor_transform_stage_point (priv->handle,
event->x,
event->y,
&priv->x_origin,
&priv->y_origin))
return FALSE;
st_widget_add_style_pseudo_class (ST_WIDGET (priv->handle), "active");
/* Account for the scrollbar-trough-handle nesting. */
priv->x_origin += clutter_actor_get_x (priv->trough);
priv->y_origin += clutter_actor_get_y (priv->trough);
g_assert (!priv->grabbed);
clutter_grab_pointer (priv->handle);
priv->grabbed = TRUE;
g_signal_emit (bar, signals[SCROLL_START], 0);
return TRUE;
}
static void
animation_completed_cb (ClutterAnimation *animation,
StScrollBarPrivate *priv)
{
g_object_unref (priv->paging_animation);
priv->paging_animation = NULL;
}
static gboolean
trough_paging_cb (StScrollBar *self)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (self);
gfloat handle_pos, event_pos, tx, ty;
gdouble value;
gdouble page_increment;
gboolean ret;
gulong mode;
ClutterAnimation *a;
GValue v = { 0, };
ClutterTimeline *t;
if (priv->paging_event_no == 0)
{
/* Scroll on after initial timeout. */
mode = CLUTTER_EASE_OUT_CUBIC;
ret = FALSE;
priv->paging_event_no = 1;
priv->paging_source_id = g_timeout_add (
PAGING_INITIAL_REPEAT_TIMEOUT,
(GSourceFunc) trough_paging_cb,
self);
g_source_set_name_by_id (priv->paging_source_id, "[gnome-shell] trough_paging_cb");
}
else if (priv->paging_event_no == 1)
{
/* Scroll on after subsequent timeout. */
ret = FALSE;
mode = CLUTTER_EASE_IN_CUBIC;
priv->paging_event_no = 2;
priv->paging_source_id = g_timeout_add (
PAGING_SUBSEQUENT_REPEAT_TIMEOUT,
(GSourceFunc) trough_paging_cb,
self);
g_source_set_name_by_id (priv->paging_source_id, "[gnome-shell] trough_paging_cb");
}
else
{
/* Keep scrolling. */
ret = TRUE;
mode = CLUTTER_LINEAR;
priv->paging_event_no++;
}
/* Do the scrolling */
st_adjustment_get_values (priv->adjustment,
&value, NULL, NULL,
NULL, &page_increment, NULL);
if (priv->vertical)
handle_pos = clutter_actor_get_y (priv->handle);
else
handle_pos = clutter_actor_get_x (priv->handle);
clutter_actor_transform_stage_point (CLUTTER_ACTOR (priv->trough),
priv->move_x,
priv->move_y,
&tx, &ty);
if (priv->vertical)
event_pos = ty;
else
event_pos = tx;
if (event_pos > handle_pos)
{
if (priv->paging_direction == NONE)
{
/* Remember direction. */
priv->paging_direction = DOWN;
}
if (priv->paging_direction == UP)
{
/* Scrolled far enough. */
return FALSE;
}
value += page_increment;
}
else
{
if (priv->paging_direction == NONE)
{
/* Remember direction. */
priv->paging_direction = UP;
}
if (priv->paging_direction == DOWN)
{
/* Scrolled far enough. */
return FALSE;
}
value -= page_increment;
}
if (priv->paging_animation)
{
clutter_animation_completed (priv->paging_animation);
}
/* FIXME: Creating a new animation for each scroll is probably not the best
* idea, but it's a lot less involved than extenind the current animation */
a = priv->paging_animation = g_object_new (CLUTTER_TYPE_ANIMATION,
"object", priv->adjustment,
"duration", (guint)(PAGING_SUBSEQUENT_REPEAT_TIMEOUT * st_slow_down_factor),
"mode", mode,
NULL);
g_value_init (&v, G_TYPE_DOUBLE);
g_value_set_double (&v, value);
clutter_animation_bind (priv->paging_animation, "value", &v);
t = clutter_animation_get_timeline (priv->paging_animation);
g_signal_connect (a, "completed", G_CALLBACK (animation_completed_cb), priv);
clutter_timeline_start (t);
return ret;
}
static gboolean
trough_button_press_event_cb (ClutterActor *actor,
ClutterButtonEvent *event,
StScrollBar *self)
{
StScrollBarPrivate *priv;
g_return_val_if_fail (self, FALSE);
if (event->button != 1)
return FALSE;
priv = st_scroll_bar_get_instance_private (self);
if (priv->adjustment == NULL)
return FALSE;
priv->move_x = event->x;
priv->move_y = event->y;
priv->paging_direction = NONE;
priv->paging_event_no = 0;
trough_paging_cb (self);
return TRUE;
}
static gboolean
trough_button_release_event_cb (ClutterActor *actor,
ClutterButtonEvent *event,
StScrollBar *self)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (self);
if (event->button != 1)
return FALSE;
if (priv->paging_source_id)
{
g_source_remove (priv->paging_source_id);
priv->paging_source_id = 0;
}
return TRUE;
}
static gboolean
trough_leave_event_cb (ClutterActor *actor,
ClutterEvent *event,
StScrollBar *self)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (self);
if (priv->paging_source_id)
{
g_source_remove (priv->paging_source_id);
priv->paging_source_id = 0;
return TRUE;
}
return FALSE;
}
static void
st_scroll_bar_notify_reactive (StScrollBar *self)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (self);
gboolean reactive = clutter_actor_get_reactive (CLUTTER_ACTOR (self));
clutter_actor_set_reactive (CLUTTER_ACTOR (priv->trough), reactive);
clutter_actor_set_reactive (CLUTTER_ACTOR (priv->handle), reactive);
}
static void
st_scroll_bar_init (StScrollBar *self)
{
StScrollBarPrivate *priv = st_scroll_bar_get_instance_private (self);
priv->trough = (ClutterActor *) st_bin_new ();
clutter_actor_set_reactive ((ClutterActor *) priv->trough, TRUE);
clutter_actor_set_name (CLUTTER_ACTOR (priv->trough), "trough");
clutter_actor_add_child (CLUTTER_ACTOR (self),
CLUTTER_ACTOR (priv->trough));
g_signal_connect (priv->trough, "button-press-event",
G_CALLBACK (trough_button_press_event_cb), self);
g_signal_connect (priv->trough, "button-release-event",
G_CALLBACK (trough_button_release_event_cb), self);
g_signal_connect (priv->trough, "leave-event",
G_CALLBACK (trough_leave_event_cb), self);
priv->handle = (ClutterActor *) st_button_new ();
clutter_actor_set_name (CLUTTER_ACTOR (priv->handle), "hhandle");
clutter_actor_add_child (CLUTTER_ACTOR (self),
CLUTTER_ACTOR (priv->handle));
g_signal_connect (priv->handle, "button-press-event",
G_CALLBACK (handle_button_press_event_cb), self);
g_signal_connect (priv->handle, "button-release-event",
G_CALLBACK (handle_button_release_event_cb), self);
g_signal_connect (priv->handle, "motion-event",
G_CALLBACK (handle_motion_event_cb), self);
clutter_actor_set_reactive (CLUTTER_ACTOR (self), TRUE);
g_signal_connect (self, "notify::reactive",
G_CALLBACK (st_scroll_bar_notify_reactive), NULL);
}
StWidget *
st_scroll_bar_new (StAdjustment *adjustment)
{
return g_object_new (ST_TYPE_SCROLL_BAR,
"adjustment", adjustment,
NULL);
}
static void
on_notify_value (GObject *object,
GParamSpec *pspec,
StScrollBar *bar)
{
scroll_bar_update_positions (bar);
}
static void
on_changed (StAdjustment *adjustment,
StScrollBar *bar)
{
scroll_bar_update_positions (bar);
}
void
st_scroll_bar_set_adjustment (StScrollBar *bar,
StAdjustment *adjustment)
{
StScrollBarPrivate *priv;
g_return_if_fail (ST_IS_SCROLL_BAR (bar));
priv = st_scroll_bar_get_instance_private (bar);
if (adjustment == priv->adjustment)
return;
if (priv->adjustment)
{
g_signal_handlers_disconnect_by_func (priv->adjustment,
on_notify_value,
bar);
g_signal_handlers_disconnect_by_func (priv->adjustment,
on_changed,
bar);
g_object_unref (priv->adjustment);
priv->adjustment = NULL;
}
if (adjustment)
{
priv->adjustment = g_object_ref (adjustment);
g_signal_connect (priv->adjustment, "notify::value",
G_CALLBACK (on_notify_value),
bar);
g_signal_connect (priv->adjustment, "changed",
G_CALLBACK (on_changed),
bar);
clutter_actor_queue_relayout (CLUTTER_ACTOR (bar));
}
g_object_notify (G_OBJECT (bar), "adjustment");
}
/**
* st_scroll_bar_get_adjustment:
* @bar: a #StScrollbar
*
* Gets the adjustment object that stores the current position
* of the scrollbar.
*
* Return value: (transfer none): the adjustment
*/
StAdjustment *
st_scroll_bar_get_adjustment (StScrollBar *bar)
{
g_return_val_if_fail (ST_IS_SCROLL_BAR (bar), NULL);
return ((StScrollBarPrivate *)ST_SCROLL_BAR_PRIVATE (bar))->adjustment;
}