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malcontent/malcontent-control/carousel.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright © 2016 Red Hat, Inc.
* Copyright © 2019 Endless Mobile, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* - Felipe Borges <felipeborges@gnome.org>
* - Philip Withnall <withnall@endlessm.com>
*/
#include <glib-object.h>
#include <gtk/gtk.h>
#include "carousel.h"
#define ARROW_SIZE 20
struct _MctCarouselItem {
GtkRadioButton parent;
gint page;
};
G_DEFINE_TYPE (MctCarouselItem, mct_carousel_item, GTK_TYPE_RADIO_BUTTON)
GtkWidget *
mct_carousel_item_new (void)
{
return g_object_new (MCT_TYPE_CAROUSEL_ITEM, NULL);
}
static void
mct_carousel_item_class_init (MctCarouselItemClass *klass)
{
}
static void
mct_carousel_item_init (MctCarouselItem *self)
{
gtk_toggle_button_set_mode (GTK_TOGGLE_BUTTON (self), FALSE);
gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (self)),
"carousel-item");
}
struct _MctCarousel {
GtkRevealer parent;
GList *children;
gint visible_page;
MctCarouselItem *selected_item;
GtkWidget *last_box;
GtkWidget *arrow;
gint arrow_start_x;
/* Widgets */
GtkStack *stack;
GtkWidget *go_back_button;
GtkWidget *go_next_button;
GtkStyleProvider *provider;
};
G_DEFINE_TYPE (MctCarousel, mct_carousel, GTK_TYPE_REVEALER)
enum {
ITEM_ACTIVATED,
NUM_SIGNALS
};
static guint signals[NUM_SIGNALS] = { 0, };
#define ITEMS_PER_PAGE 3
static gint
mct_carousel_item_get_x (MctCarouselItem *item,
MctCarousel *carousel)
{
GtkWidget *widget, *parent;
gint width;
gint dest_x;
parent = GTK_WIDGET (carousel->stack);
widget = GTK_WIDGET (item);
width = gtk_widget_get_allocated_width (widget);
if (!gtk_widget_translate_coordinates (widget,
parent,
width / 2,
0,
&dest_x,
NULL))
return 0;
return CLAMP (dest_x - ARROW_SIZE,
0,
gtk_widget_get_allocated_width (parent));
}
static void
mct_carousel_move_arrow (MctCarousel *self)
{
GtkStyleContext *context;
gchar *css;
gint end_x;
GtkSettings *settings;
gboolean animations;
if (!self->selected_item)
return;
end_x = mct_carousel_item_get_x (self->selected_item, self);
context = gtk_widget_get_style_context (self->arrow);
if (self->provider)
gtk_style_context_remove_provider (context, self->provider);
g_clear_object (&self->provider);
settings = gtk_widget_get_settings (GTK_WIDGET (self));
g_object_get (settings, "gtk-enable-animations", &animations, NULL);
/* Animate the arrow movement if animations are enabled. Otherwise,
* jump the arrow to the right location instantly. */
if (animations)
{
css = g_strdup_printf ("@keyframes arrow_keyframes-%d-%d {\n"
" from { margin-left: %dpx; }\n"
" to { margin-left: %dpx; }\n"
"}\n"
"* {\n"
" animation-name: arrow_keyframes-%d-%d;\n"
"}\n",
self->arrow_start_x, end_x,
self->arrow_start_x, end_x,
self->arrow_start_x, end_x);
}
else
{
css = g_strdup_printf ("* { margin-left: %dpx }", end_x);
}
self->provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ());
gtk_css_provider_load_from_data (GTK_CSS_PROVIDER (self->provider), css, -1, NULL);
gtk_style_context_add_provider (context, self->provider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
g_free (css);
}
static gint
get_last_page_number (MctCarousel *self)
{
if (g_list_length (self->children) == 0)
return 0;
return ((g_list_length (self->children) - 1) / ITEMS_PER_PAGE);
}
static void
update_buttons_visibility (MctCarousel *self)
{
gtk_widget_set_visible (self->go_back_button, (self->visible_page > 0));
gtk_widget_set_visible (self->go_next_button, (self->visible_page < get_last_page_number (self)));
}
/**
* mct_carousel_find_item:
* @carousel: an MctCarousel instance
* @data: user data passed to the comparation function
* @func: the function to call for each element.
* It should return 0 when the desired element is found
*
* Finds an MctCarousel item using the supplied function to find the
* desired element.
* Ideally useful for matching a model object and its correspondent
* widget.
*
* Returns: the found MctCarouselItem, or %NULL if it is not found
*/
MctCarouselItem *
mct_carousel_find_item (MctCarousel *self,
gconstpointer data,
GCompareFunc func)
{
GList *list;
list = self->children;
while (list != NULL)
{
if (!func (list->data, data))
return list->data;
list = list->next;
}
return NULL;
}
static void
on_item_toggled (MctCarouselItem *item,
GdkEvent *event,
gpointer user_data)
{
MctCarousel *self = MCT_CAROUSEL (user_data);
mct_carousel_select_item (self, item);
}
void
mct_carousel_select_item (MctCarousel *self,
MctCarouselItem *item)
{
gchar *page_name;
gboolean page_changed = TRUE;
/* Select first user if none is specified */
if (item == NULL)
{
if (self->children != NULL)
item = self->children->data;
else
return;
}
if (self->selected_item != NULL)
{
page_changed = (self->selected_item->page != item->page);
self->arrow_start_x = mct_carousel_item_get_x (self->selected_item, self);
}
self->selected_item = item;
self->visible_page = item->page;
g_signal_emit (self, signals[ITEM_ACTIVATED], 0, item);
if (!page_changed)
{
mct_carousel_move_arrow (self);
return;
}
page_name = g_strdup_printf ("%d", self->visible_page);
gtk_stack_set_visible_child_name (self->stack, page_name);
g_free (page_name);
update_buttons_visibility (self);
/* mct_carousel_move_arrow is called from on_transition_running */
}
static void
mct_carousel_select_item_at_index (MctCarousel *self,
gint index)
{
GList *l = NULL;
l = g_list_nth (self->children, index);
mct_carousel_select_item (self, l->data);
}
static void
mct_carousel_goto_previous_page (GtkWidget *button,
gpointer user_data)
{
MctCarousel *self = MCT_CAROUSEL (user_data);
self->visible_page--;
if (self->visible_page < 0)
self->visible_page = 0;
/* Select first item of the page */
mct_carousel_select_item_at_index (self, self->visible_page * ITEMS_PER_PAGE);
}
static void
mct_carousel_goto_next_page (GtkWidget *button,
gpointer user_data)
{
MctCarousel *self = MCT_CAROUSEL (user_data);
gint last_page;
last_page = get_last_page_number (self);
self->visible_page++;
if (self->visible_page > last_page)
self->visible_page = last_page;
/* Select first item of the page */
mct_carousel_select_item_at_index (self, self->visible_page * ITEMS_PER_PAGE);
}
static void
mct_carousel_add (GtkContainer *container,
GtkWidget *widget)
{
MctCarousel *self = MCT_CAROUSEL (container);
gboolean last_box_is_full;
if (!MCT_IS_CAROUSEL_ITEM (widget))
{
GTK_CONTAINER_CLASS (mct_carousel_parent_class)->add (container, widget);
return;
}
gtk_style_context_add_class (gtk_widget_get_style_context (widget), "menu");
gtk_button_set_relief (GTK_BUTTON (widget), GTK_RELIEF_NONE);
self->children = g_list_append (self->children, widget);
MCT_CAROUSEL_ITEM (widget)->page = get_last_page_number (self);
if (self->selected_item != NULL)
gtk_radio_button_join_group (GTK_RADIO_BUTTON (widget), GTK_RADIO_BUTTON (self->selected_item));
g_signal_connect (widget, "button-press-event", G_CALLBACK (on_item_toggled), self);
last_box_is_full = ((g_list_length (self->children) - 1) % ITEMS_PER_PAGE == 0);
if (last_box_is_full)
{
g_autofree gchar *page = NULL;
page = g_strdup_printf ("%d", MCT_CAROUSEL_ITEM (widget)->page);
self->last_box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_widget_show (self->last_box);
gtk_widget_set_valign (self->last_box, GTK_ALIGN_CENTER);
gtk_stack_add_named (self->stack, self->last_box, page);
}
gtk_widget_show_all (widget);
gtk_box_pack_start (GTK_BOX (self->last_box), widget, TRUE, FALSE, 10);
update_buttons_visibility (self);
}
static void
destroy_widget_cb (GtkWidget *widget,
gpointer user_data)
{
gtk_widget_destroy (widget);
}
void
mct_carousel_purge_items (MctCarousel *self)
{
gtk_container_forall (GTK_CONTAINER (self->stack),
destroy_widget_cb,
NULL);
g_list_free (self->children);
self->children = NULL;
self->visible_page = 0;
self->selected_item = NULL;
}
MctCarousel *
mct_carousel_new (void)
{
return g_object_new (MCT_TYPE_CAROUSEL, NULL);
}
static void
mct_carousel_dispose (GObject *object)
{
MctCarousel *self = MCT_CAROUSEL (object);
g_clear_object (&self->provider);
if (self->children != NULL)
{
g_list_free (self->children);
self->children = NULL;
}
G_OBJECT_CLASS (mct_carousel_parent_class)->dispose (object);
}
static void
mct_carousel_class_init (MctCarouselClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *wclass = GTK_WIDGET_CLASS (klass);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
gtk_widget_class_set_template_from_resource (wclass,
"/org/freedesktop/MalcontentControl/ui/carousel.ui");
gtk_widget_class_bind_template_child (wclass, MctCarousel, stack);
gtk_widget_class_bind_template_child (wclass, MctCarousel, go_back_button);
gtk_widget_class_bind_template_child (wclass, MctCarousel, go_next_button);
gtk_widget_class_bind_template_child (wclass, MctCarousel, arrow);
gtk_widget_class_bind_template_callback (wclass, mct_carousel_goto_previous_page);
gtk_widget_class_bind_template_callback (wclass, mct_carousel_goto_next_page);
object_class->dispose = mct_carousel_dispose;
container_class->add = mct_carousel_add;
signals[ITEM_ACTIVATED] =
g_signal_new ("item-activated",
MCT_TYPE_CAROUSEL,
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
g_cclosure_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
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)
{
if (!gtk_stack_get_transition_running (self->stack))
mct_carousel_move_arrow (self);
}
static void
mct_carousel_init (MctCarousel *self)
{
GtkStyleProvider *provider;
gtk_widget_init_template (GTK_WIDGET (self));
provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ());
gtk_css_provider_load_from_resource (GTK_CSS_PROVIDER (provider),
"/org/freedesktop/MalcontentControl/ui/carousel.css");
gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
provider,
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION - 1);
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);
}
guint
mct_carousel_get_item_count (MctCarousel *self)
{
return g_list_length (self->children);
}
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