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carousel: Replace size-allocate callback by a layout manager 

GTK4 has no size-allocate signal anymore, but we can use a custom
layout manager to produce the same effect.
This commit is contained in:
Georges Basile Stavracas Neto 2022-07-12 17:43:27 -03:00
parent 3656cffcc0
commit 4887ded149
1 changed files with 71 additions and 14 deletions
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85
malcontent-control/carousel.c
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@ -29,6 +29,9 @@
#define ARROW_SIZE 20
#define MCT_TYPE_CAROUSEL_LAYOUT (mct_carousel_layout_get_type ())
G_DECLARE_FINAL_TYPE (MctCarouselLayout, mct_carousel_layout, MCT, CAROUSEL_LAYOUT, GtkLayoutManager)
struct _MctCarouselItem {
GtkButton parent;
@ -393,6 +396,8 @@ mct_carousel_class_init (MctCarouselClass *klass)
gtk_widget_class_bind_template_callback (wclass, mct_carousel_goto_previous_page);
gtk_widget_class_bind_template_callback (wclass, mct_carousel_goto_next_page);
gtk_widget_class_set_layout_manager_type (wclass, MCT_TYPE_CAROUSEL_LAYOUT);
object_class->dispose = mct_carousel_dispose;
signals[ITEM_ACTIVATED] =
@ -406,19 +411,6 @@ mct_carousel_class_init (MctCarouselClass *klass)
MCT_TYPE_CAROUSEL_ITEM);
}
static void
on_size_allocate (MctCarousel *self)
{
if (self->selected_item == NULL)
return;
if (gtk_stack_get_transition_running (self->stack))
return;
self->arrow_start_x = mct_carousel_item_get_x (self->selected_item, self);
mct_carousel_move_arrow (self);
}
static void
on_transition_running (MctCarousel *self)
{
@ -443,7 +435,6 @@ mct_carousel_init (MctCarousel *self)
g_object_unref (provider);
g_signal_connect_swapped (self->stack, "size-allocate", G_CALLBACK (on_size_allocate), self);
g_signal_connect_swapped (self->stack, "notify::transition-running", G_CALLBACK (on_transition_running), self);
}
@ -461,3 +452,69 @@ mct_carousel_set_revealed (MctCarousel *self,
gtk_revealer_set_reveal_child (self->revealer, revealed);
}
struct _MctCarouselLayout {
GtkLayoutManager parent;
};
G_DEFINE_FINAL_TYPE (MctCarouselLayout, mct_carousel_layout, GTK_TYPE_LAYOUT_MANAGER)
static void
mct_carousel_layout_measure (GtkLayoutManager *layout_manager,
GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
MctCarousel *carousel;
g_assert (MCT_IS_CAROUSEL (widget));
carousel = MCT_CAROUSEL (widget);
gtk_widget_measure (GTK_WIDGET (carousel->revealer),
orientation, for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
mct_carousel_layout_allocate (GtkLayoutManager *layout_manager,
GtkWidget *widget,
int width,
int height,
int baseline)
{
MctCarousel *carousel;
g_assert (MCT_IS_CAROUSEL (widget));
carousel = MCT_CAROUSEL (widget);
gtk_widget_allocate (GTK_WIDGET (carousel->revealer), width, height, baseline, NULL);
if (carousel->selected_item == NULL)
return;
if (gtk_stack_get_transition_running (carousel->stack))
return;
carousel->arrow_start_x = mct_carousel_item_get_x (carousel->selected_item, carousel);
mct_carousel_move_arrow (carousel);
}
static void
mct_carousel_layout_class_init (MctCarouselLayoutClass *klass)
{
GtkLayoutManagerClass *layout_manager_class = GTK_LAYOUT_MANAGER_CLASS (klass);
layout_manager_class->measure = mct_carousel_layout_measure;
layout_manager_class->allocate = mct_carousel_layout_allocate;
}
static void
mct_carousel_layout_init (MctCarouselLayout *self)
{
}