static void
gtk_revealer_real_realize (GtkWidget *widget)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkAllocation allocation;
GdkWindowAttr attributes = { 0 };
GdkWindowAttributesType attributes_mask;
GtkAllocation child_allocation;
GtkWidget *child;
GtkStyleContext *context;
GtkRevealerTransitionType transition;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.event_mask =
gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
attributes_mask = (GDK_WA_X | GDK_WA_Y) | GDK_WA_VISUAL;
priv->view_window =
gdk_window_new (gtk_widget_get_parent_window ((GtkWidget*) revealer),
&attributes, attributes_mask);
gtk_widget_set_window (widget, priv->view_window);
gtk_widget_register_window (widget, priv->view_window);
gtk_revealer_get_child_allocation (revealer, &allocation, &child_allocation);
attributes.x = 0;
attributes.y = 0;
attributes.width = child_allocation.width;
attributes.height = child_allocation.height;
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN)
attributes.y = allocation.height - child_allocation.height;
else if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
attributes.x = allocation.width - child_allocation.width;
priv->bin_window =
gdk_window_new (priv->view_window, &attributes, attributes_mask);
gtk_widget_register_window (widget, priv->bin_window);
child = gtk_bin_get_child (GTK_BIN (revealer));
if (child != NULL)
gtk_widget_set_parent_window (child, priv->bin_window);
context = gtk_widget_get_style_context (widget);
gtk_style_context_set_background (context, priv->view_window);
gtk_style_context_set_background (context, priv->bin_window);
gdk_window_show (priv->bin_window);
}
static void
gtk_revealer_real_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width_out,
gint *natural_width_out)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gint minimum_width;
gint natural_width;
GtkRevealerTransitionType transition;
GTK_WIDGET_CLASS (gtk_revealer_parent_class)->get_preferred_width_for_height (widget, height, &minimum_width, &natural_width);
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_LEFT ||
transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
natural_width = round (natural_width * priv->current_pos);
minimum_width = MIN (minimum_width, natural_width);
if (minimum_width_out)
*minimum_width_out = minimum_width;
if (natural_width_out)
*natural_width_out = natural_width;
}
static void
gtk_revealer_real_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height_out,
gint *natural_height_out)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gint minimum_height;
gint natural_height;
GtkRevealerTransitionType transition;
GTK_WIDGET_CLASS (gtk_revealer_parent_class)->get_preferred_height_for_width (widget, width, &minimum_height, &natural_height);
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_UP ||
transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN)
natural_height = round (natural_height * priv->current_pos);
minimum_height = MIN (minimum_height, natural_height);
if (minimum_height_out)
*minimum_height_out = minimum_height;
if (natural_height_out)
*natural_height_out = natural_height;
}
static void
gtk_revealer_start_animation (GtkRevealer *revealer,
gdouble target)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkWidget *widget = GTK_WIDGET (revealer);
GtkRevealerTransitionType transition;
if (priv->target_pos == target)
return;
priv->target_pos = target;
g_object_notify (G_OBJECT (revealer), "reveal-child");
transition = effective_transition (revealer);
if (gtk_widget_get_mapped (widget) &&
priv->transition_duration != 0 &&
transition != GTK_REVEALER_TRANSITION_TYPE_NONE)
{
priv->source_pos = priv->current_pos;
priv->start_time = gdk_frame_clock_get_frame_time (gtk_widget_get_frame_clock (widget));
priv->end_time = priv->start_time + (priv->transition_duration * 1000);
if (priv->tick_id == 0)
priv->tick_id =
gtk_widget_add_tick_callback (widget, (GtkTickCallback)gtk_revealer_animate_cb, revealer, NULL);
gtk_revealer_animate_step (revealer, priv->start_time);
}
else
{
gtk_revealer_set_position (revealer, target);
}
}
static void
set_width_with_paddings (GtkRevealer *revealer,
gint preferred_minimum_width,
gint preferred_natural_width,
gint *minimum_width_out,
gint *natural_width_out)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gint minimum_width;
gint natural_width;
GtkRevealerTransitionType transition;
GtkBorder padding;
gint horizontal_padding;
gtk_revealer_get_padding (revealer, &padding);
horizontal_padding = padding.left + padding.right;
minimum_width = preferred_minimum_width + horizontal_padding;
natural_width = preferred_natural_width + horizontal_padding;
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_LEFT ||
transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
{
/* Paddings are included in the animation */
minimum_width = round (minimum_width * priv->current_pos);
natural_width = round (natural_width * priv->current_pos);
}
*minimum_width_out = MIN (minimum_width, natural_width);
*natural_width_out = natural_width;
}
static void
set_height_with_paddings (GtkRevealer *revealer,
gint preferred_minimum_height,
gint preferred_natural_height,
gint *minimum_height_out,
gint *natural_height_out)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gint minimum_height;
gint natural_height;
GtkRevealerTransitionType transition;
GtkBorder padding;
gint vertical_padding;
gtk_revealer_get_padding (revealer, &padding);
vertical_padding = padding.top + padding.bottom;
minimum_height = preferred_minimum_height + vertical_padding;
natural_height = preferred_natural_height + vertical_padding;
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_NONE ||
transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_UP ||
transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN)
{
/* Padding are included in the animation */
minimum_height = round (minimum_height * priv->current_pos);
natural_height = round (natural_height * priv->current_pos);
}
*minimum_height_out = MIN (minimum_height, natural_height);
*natural_height_out = natural_height;
}
/**
* gtk_revealer_get_reveal_child:
* @revealer: a #GtkRevealer
*
* Returns whether the child is currently
* revealed. See gtk_revealer_set_reveal_child().
*
* This function returns %TRUE as soon as the transition
* is to the revealed state is started. To learn whether
* the child is fully revealed (ie the transition is completed),
* use gtk_revealer_get_child_revealed().
*
* Return value: %TRUE if the child is revealed.
*
* Since: 3.10
*/
gboolean
gtk_revealer_get_reveal_child (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_val_if_fail (GTK_IS_REVEALER (revealer), FALSE);
return priv->target_pos != 0.0;
}
/**
* gtk_revealer_get_transition_duration:
* @revealer: a #GtkRevealer
*
* Returns the amount of time (in milliseconds) that
* transitions will take.
*
* Returns: the transition duration
*
* Since: 3.10
*/
guint
gtk_revealer_get_transition_duration (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_val_if_fail (GTK_IS_REVEALER (revealer), 0);
return priv->transition_duration;
}
/**
* gtk_revealer_get_transition_type:
* @revealer: a #GtkRevealer
*
* Gets the type of animation that will be used
* for transitions in @revealer.
*
* Return value: the current transition type of @revealer
*
* Since: 3.10
*/
GtkRevealerTransitionType
gtk_revealer_get_transition_type (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_val_if_fail (GTK_IS_REVEALER (revealer), GTK_REVEALER_TRANSITION_TYPE_NONE);
return priv->transition_type;
}
/**
* gtk_revealer_set_transition_duration:
* @revealer: a #GtkRevealer
* @duration: the new duration, in milliseconds
*
* Sets the duration that transitions will take.
*
* Since: 3.10
*/
void
gtk_revealer_set_transition_duration (GtkRevealer *revealer,
guint value)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_if_fail (GTK_IS_REVEALER (revealer));
priv->transition_duration = value;
g_object_notify (G_OBJECT (revealer), "transition-duration");
}
/**
* gtk_revealer_get_child_revealed:
* @revealer: a #GtkRevealer
*
* Returns whether the child is fully revealed, ie wether
* the transition to the revealed state is completed.
*
* Return value: %TRUE if the child is fully revealed
*
* Since: 3.10
*/
gboolean
gtk_revealer_get_child_revealed (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gboolean animation_finished = (priv->target_pos == priv->current_pos);
gboolean reveal_child = gtk_revealer_get_reveal_child (revealer);
if (animation_finished)
return reveal_child;
else
return !reveal_child;
}
static void
gtk_revealer_real_unrealize (GtkWidget *widget)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gtk_widget_unregister_window (widget, priv->bin_window);
gdk_window_destroy (priv->bin_window);
priv->view_window = NULL;
GTK_WIDGET_CLASS (gtk_revealer_parent_class)->unrealize (widget);
}
static void
gtk_revealer_finalize (GObject *obj)
{
GtkRevealer *revealer = GTK_REVEALER (obj);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
if (priv->tick_id != 0)
gtk_widget_remove_tick_callback (GTK_WIDGET (revealer), priv->tick_id);
priv->tick_id = 0;
G_OBJECT_CLASS (gtk_revealer_parent_class)->finalize (obj);
}
static gboolean
gtk_revealer_real_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
if (gtk_cairo_should_draw_window (cr, priv->bin_window))
GTK_WIDGET_CLASS (gtk_revealer_parent_class)->draw (widget, cr);
return TRUE;
}
static void
gtk_revealer_stop_animation (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
priv->current_pos = priv->target_pos;
if (priv->tick_id != 0)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (revealer), priv->tick_id);
priv->tick_id = 0;
}
}
/**
* gtk_revealer_set_transition_type:
* @revealer: a #GtkRevealer
* @transition: the new transition type
*
* Sets the type of animation that will be used for
* transitions in @revealer. Available types include
* various kinds of fades and slides.
*
* Since: 3.10
*/
void
gtk_revealer_set_transition_type (GtkRevealer *revealer,
GtkRevealerTransitionType transition)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_if_fail (GTK_IS_REVEALER (revealer));
priv->transition_type = transition;
gtk_widget_queue_resize (GTK_WIDGET (revealer));
g_object_notify (G_OBJECT (revealer), "transition-type");
}
static void
gtk_revealer_init (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
priv->transition_type = GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN;
priv->transition_duration = 250;
priv->current_pos = 0.0;
priv->target_pos = 0.0;
gtk_widget_set_has_window ((GtkWidget*) revealer, TRUE);
gtk_widget_set_redraw_on_allocate ((GtkWidget*) revealer, FALSE);
}
static void
gtk_revealer_real_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkAllocation child_allocation;
GtkWidget *child;
gboolean window_visible;
int bin_x, bin_y;
GtkRevealerTransitionType transition;
g_return_if_fail (allocation != NULL);
gtk_widget_set_allocation (widget, allocation);
gtk_revealer_get_child_allocation (revealer, allocation, &child_allocation);
child = gtk_bin_get_child (GTK_BIN (revealer));
if (child != NULL && gtk_widget_get_visible (child))
gtk_widget_size_allocate (child, &child_allocation);
if (gtk_widget_get_realized (widget))
{
if (gtk_widget_get_mapped (widget))
{
window_visible = allocation->width > 0 && allocation->height > 0;
if (!window_visible && gdk_window_is_visible (priv->view_window))
gdk_window_hide (priv->view_window);
if (window_visible && !gdk_window_is_visible (priv->view_window))
gdk_window_show (priv->view_window);
}
gdk_window_move_resize (priv->view_window,
allocation->x, allocation->y,
allocation->width, allocation->height);
bin_x = 0;
bin_y = 0;
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN)
bin_y = allocation->height - child_allocation.height;
else if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
bin_x = allocation->width - child_allocation.width;
gdk_window_move_resize (priv->bin_window,
bin_x, bin_y,
child_allocation.width, child_allocation.height);
}
}
/**
* gtk_revealer_set_transition_duration:
* @revealer: a #GtkRevealer
* @duration: the new duration, in milliseconds
*
* Sets the duration that transitions will take.
*
* Since: 3.10
*/
void
gtk_revealer_set_transition_duration (GtkRevealer *revealer,
guint value)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_if_fail (GTK_IS_REVEALER (revealer));
if (priv->transition_duration == value)
return;
priv->transition_duration = value;
g_object_notify_by_pspec (G_OBJECT (revealer), props[PROP_TRANSITION_DURATION]);
}
static void
gtk_revealer_real_add (GtkContainer *container,
GtkWidget *child)
{
GtkRevealer *revealer = GTK_REVEALER (container);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_if_fail (child != NULL);
gtk_widget_set_parent_window (child, priv->bin_window);
gtk_widget_set_child_visible (child, priv->current_pos != 0.0);
GTK_CONTAINER_CLASS (gtk_revealer_parent_class)->add (container, child);
}
/**
* gtk_revealer_set_transition_type:
* @revealer: a #GtkRevealer
* @transition: the new transition type
*
* Sets the type of animation that will be used for
* transitions in @revealer. Available types include
* various kinds of fades and slides.
*
* Since: 3.10
*/
void
gtk_revealer_set_transition_type (GtkRevealer *revealer,
GtkRevealerTransitionType transition)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
g_return_if_fail (GTK_IS_REVEALER (revealer));
if (priv->transition_type == transition)
return;
priv->transition_type = transition;
gtk_widget_queue_resize (GTK_WIDGET (revealer));
g_object_notify_by_pspec (G_OBJECT (revealer), props[PROP_TRANSITION_TYPE]);
}
static GtkRevealerTransitionType
effective_transition (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
if (gtk_widget_get_direction (GTK_WIDGET (revealer)) == GTK_TEXT_DIR_RTL)
{
if (priv->transition_type == GTK_REVEALER_TRANSITION_TYPE_SLIDE_LEFT)
return GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT;
else if (priv->transition_type == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
return GTK_REVEALER_TRANSITION_TYPE_SLIDE_LEFT;
}
return priv->transition_type;
}
static void
gtk_revealer_animate_step (GtkRevealer *revealer,
gint64 now)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gdouble t;
t = 1.0;
if (now < priv->end_time)
t = (now - priv->start_time) / (gdouble) (priv->end_time - priv->start_time);
t = ease_out_quad (t, 1.0);
gtk_revealer_set_position (revealer,
priv->source_pos + (t * (priv->target_pos - priv->source_pos)));
}
static void
gtk_revealer_real_style_updated (GtkWidget *widget)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkStyleContext* context;
GTK_WIDGET_CLASS (gtk_revealer_parent_class)->style_updated (widget);
if (gtk_widget_get_realized (widget))
{
context = gtk_widget_get_style_context (widget);
gtk_style_context_set_background (context, priv->bin_window);
gtk_style_context_set_background (context, priv->view_window);
}
}
static void
gtk_revealer_real_map (GtkWidget *widget)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkAllocation allocation;
if (!gtk_widget_get_mapped (widget))
{
gtk_widget_get_allocation (widget, &allocation);
if (allocation.width > 0 && allocation.height > 0)
gdk_window_show (priv->view_window);
}
GTK_WIDGET_CLASS (gtk_revealer_parent_class)->map (widget);
}
static gboolean
gtk_revealer_animate_cb (GtkRevealer *revealer,
GdkFrameClock *frame_clock,
gpointer user_data)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gint64 now;
now = gdk_frame_clock_get_frame_time (frame_clock);
gtk_revealer_animate_step (revealer, now);
if (priv->current_pos == priv->target_pos)
{
priv->tick_id = 0;
return FALSE;
}
return TRUE;
}
static GtkRevealerTransitionType
effective_transition (GtkRevealer *revealer)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gboolean animations_enabled;
g_object_get (gtk_widget_get_settings (GTK_WIDGET (revealer)),
"gtk-enable-animations", &animations_enabled,
NULL);
if (!animations_enabled)
return GTK_REVEALER_TRANSITION_TYPE_NONE;
if (gtk_widget_get_direction (GTK_WIDGET (revealer)) == GTK_TEXT_DIR_RTL)
{
if (priv->transition_type == GTK_REVEALER_TRANSITION_TYPE_SLIDE_LEFT)
return GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT;
else if (priv->transition_type == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
return GTK_REVEALER_TRANSITION_TYPE_SLIDE_LEFT;
}
return priv->transition_type;
}
static void
gtk_revealer_set_position (GtkRevealer *revealer,
gdouble pos)
{
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
gboolean new_visible;
GtkWidget *child;
GtkRevealerTransitionType transition;
priv->current_pos = pos;
/* We check target_pos here too, because we want to ensure we set
* child_visible immediately when starting a reveal operation
* otherwise the child widgets will not be properly realized
* after the reveal returns.
*/
new_visible = priv->current_pos != 0.0 || priv->target_pos != 0.0;
child = gtk_bin_get_child (GTK_BIN (revealer));
if (child != NULL &&
new_visible != gtk_widget_get_child_visible (child))
gtk_widget_set_child_visible (child, new_visible);
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_CROSSFADE)
{
gtk_widget_set_opacity (GTK_WIDGET (revealer), priv->current_pos);
gtk_widget_queue_draw (GTK_WIDGET (revealer));
}
else
{
gtk_widget_queue_resize (GTK_WIDGET (revealer));
}
if (priv->current_pos == priv->target_pos)
g_object_notify (G_OBJECT (revealer), "child-revealed");
}
static void
gtk_revealer_real_realize (GtkWidget *widget)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkAllocation allocation;
GdkWindowAttr attributes = { 0 };
GdkWindowAttributesType attributes_mask;
GtkAllocation child_allocation;
GtkWidget *child;
GtkRevealerTransitionType transition;
GtkBorder padding;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.event_mask =
gtk_widget_get_events (widget);
attributes_mask = (GDK_WA_X | GDK_WA_Y) | GDK_WA_VISUAL;
priv->view_window =
gdk_window_new (gtk_widget_get_parent_window ((GtkWidget*) revealer),
&attributes, attributes_mask);
gtk_widget_set_window (widget, priv->view_window);
gtk_widget_register_window (widget, priv->view_window);
gtk_revealer_get_child_allocation (revealer, &allocation, &child_allocation);
gtk_revealer_get_padding (revealer, &padding);
attributes.x = 0;
attributes.y = 0;
attributes.width = child_allocation.width;
attributes.height = child_allocation.height;
/* See explanation on gtk_revealer_real_size_allocate */
transition = effective_transition (revealer);
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN)
{
attributes.y = allocation.height - child_allocation.height - padding.bottom;
attributes.x = padding.left;
}
else if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
{
attributes.y = padding.top;
attributes.x = allocation.width - child_allocation.width - padding.right;
}
else
{
attributes.y = padding.top;
attributes.x = padding.left;
}
priv->bin_window =
gdk_window_new (priv->view_window, &attributes, attributes_mask);
gtk_widget_register_window (widget, priv->bin_window);
child = gtk_bin_get_child (GTK_BIN (revealer));
if (child != NULL)
gtk_widget_set_parent_window (child, priv->bin_window);
gdk_window_show (priv->bin_window);
}
static void
gtk_revealer_real_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkRevealer *revealer = GTK_REVEALER (widget);
GtkRevealerPrivate *priv = gtk_revealer_get_instance_private (revealer);
GtkAllocation child_allocation;
GtkWidget *child;
gboolean window_visible;
int bin_x, bin_y;
GtkRevealerTransitionType transition;
GtkBorder padding;
g_return_if_fail (allocation != NULL);
gtk_widget_set_allocation (widget, allocation);
gtk_revealer_get_child_allocation (revealer, allocation, &child_allocation);
child = gtk_bin_get_child (GTK_BIN (revealer));
if (child != NULL && gtk_widget_get_visible (child))
gtk_widget_size_allocate (child, &child_allocation);
if (gtk_widget_get_realized (widget))
{
if (gtk_widget_get_mapped (widget))
{
window_visible = allocation->width > 0 && allocation->height > 0;
if (!window_visible && gdk_window_is_visible (priv->view_window))
gdk_window_hide (priv->view_window);
if (window_visible && !gdk_window_is_visible (priv->view_window))
gdk_window_show (priv->view_window);
}
/* The view window will follow the revealer allocation, which is modified
* along the animation */
gdk_window_move_resize (priv->view_window,
allocation->x, allocation->y,
allocation->width, allocation->height);
gtk_revealer_get_padding (revealer, &padding);
bin_x = 0;
bin_y = 0;
transition = effective_transition (revealer);
/* The child allocation is fixed (it is not modified by the animation),
* and it's origin is relative to the bin_window.
* The bin_window has the same allocation as the child, and then the bin_window
* deals with the relative positioning with respect to the revealer taking
* into account the paddings of the revealer.
*
* For most of transitions, the bin_window moves along with the revealer,
* as its allocation changes.
* However for GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN
* we need to first move the bin_window upwards and then slide it down in
* the revealer.
* Otherwise the child would appear as static and the revealer will allocate
* following the animation, clipping the child.
* To calculate the correct y position for this case:
* allocation->height - child_allocation.height is the relative position
* towards the revealer taking into account the animation progress with
* both vertical paddings added, therefore we need to substract the part
* that we don't want to take into account for the y position, which
* in this case is the bottom padding.
*
* The same special treatment is needed for GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT.
*/
if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN)
{
bin_y = allocation->height - child_allocation.height - padding.bottom;
bin_x = padding.left;
}
else if (transition == GTK_REVEALER_TRANSITION_TYPE_SLIDE_RIGHT)
{
bin_y = padding.top;
bin_x = allocation->width - child_allocation.width - padding.right;
}
else
{
bin_x = padding.left;
bin_y = padding.top;
}
gdk_window_move_resize (priv->bin_window,
bin_x, bin_y,
child_allocation.width, child_allocation.height);
}
}
