gtk2/demos/gtk-demo/listview_weather.c
Matthias Clasen 386b63b85d scrolledwindow: Don't take adjustments in new()
In 99.9% of all cases, these are just NULL, NULL.
So just do away with these arguments, people can
use the setters for the rare cases where they want
the scrolled window to use a different adjustment.
2020-06-24 11:25:09 -04:00

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8.6 KiB
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/* Lists/Weather
*
* This demo shows a few of the rarer features of GtkListView and
* how they can be used to display weather information.
*
* The hourly weather info uses a horizontal listview. This is easy
* to achieve because GtkListView implements the GtkOrientable interface.
* To make the items in the list stand out more, the listview uses
* separators.
*
* A GtkNoSelectionModel is used to make sure no item in the list can be
* selected. All other interactions with the items is still possible.
*
* The dataset used here has 70000 items.
*/
#include <gtk/gtk.h>
#define GTK_TYPE_WEATHER_INFO (gtk_weather_info_get_type ())
G_DECLARE_FINAL_TYPE (GtkWeatherInfo, gtk_weather_info, GTK, WEATHER_INFO, GObject)
typedef enum {
GTK_WEATHER_CLEAR,
GTK_WEATHER_FEW_CLOUDS,
GTK_WEATHER_FOG,
GTK_WEATHER_OVERCAST,
GTK_WEATHER_SCATTERED_SHOWERS,
GTK_WEATHER_SHOWERS,
GTK_WEATHER_SNOW,
GTK_WEATHER_STORM
} GtkWeatherType;
struct _GtkWeatherInfo
{
GObject parent_instance;
gint64 timestamp;
int temperature;
GtkWeatherType weather_type;
};
struct _GtkWeatherInfoClass
{
GObjectClass parent_class;
};
G_DEFINE_TYPE (GtkWeatherInfo, gtk_weather_info, G_TYPE_OBJECT)
static void
gtk_weather_info_class_init (GtkWeatherInfoClass *klass)
{
}
static void
gtk_weather_info_init (GtkWeatherInfo *self)
{
}
static GtkWeatherInfo *
gtk_weather_info_new (GDateTime *timestamp,
GtkWeatherInfo *copy_from)
{
GtkWeatherInfo *result;
result = g_object_new (GTK_TYPE_WEATHER_INFO, NULL);
result->timestamp = g_date_time_to_unix (timestamp);
if (copy_from)
{
result->temperature = copy_from->temperature;
result->weather_type = copy_from->weather_type;
}
return result;
}
static GDateTime *
parse_timestamp (const char *string,
GTimeZone *_tz)
{
char *with_seconds;
GDateTime *result;
with_seconds = g_strconcat (string, ":00", NULL);
result = g_date_time_new_from_iso8601 (with_seconds, _tz);
g_free (with_seconds);
return result;
}
static GtkWeatherType
parse_weather_type (const char *clouds,
const char *precip,
GtkWeatherType fallback)
{
if (strstr (precip, "SN"))
return GTK_WEATHER_SNOW;
if (strstr (precip, "TS"))
return GTK_WEATHER_STORM;
if (strstr (precip, "DZ"))
return GTK_WEATHER_SCATTERED_SHOWERS;
if (strstr (precip, "SH") || strstr (precip, "RA"))
return GTK_WEATHER_SHOWERS;
if (strstr (precip, "FG"))
return GTK_WEATHER_FOG;
if (g_str_equal (clouds, "M") ||
g_str_equal (clouds, ""))
return fallback;
if (strstr (clouds, "OVC") ||
strstr (clouds, "BKN"))
return GTK_WEATHER_OVERCAST;
if (strstr (clouds, "BKN") ||
strstr (clouds, "SCT"))
return GTK_WEATHER_FEW_CLOUDS;
if (strstr (clouds, "VV"))
return GTK_WEATHER_FOG;
return GTK_WEATHER_CLEAR;
}
static double
parse_temperature (const char *s,
double fallback)
{
char *endptr;
double d;
d = g_ascii_strtod (s, &endptr);
if (*endptr != '\0')
return fallback;
return d;
}
static GListModel *
create_weather_model (void)
{
GListStore *store;
GTimeZone *utc;
GDateTime *timestamp;
GtkWeatherInfo *info;
GBytes *data;
char **lines;
guint i;
store = g_list_store_new (GTK_TYPE_WEATHER_INFO);
data = g_resources_lookup_data ("/listview_weather/listview_weather.txt", 0, NULL);
lines = g_strsplit (g_bytes_get_data (data, NULL), "\n", 0);
utc = g_time_zone_new_utc ();
timestamp = g_date_time_new (utc, 2011, 1, 1, 0, 0, 0);
info = gtk_weather_info_new (timestamp, NULL);
g_list_store_append (store, info);
g_object_unref (info);
for (i = 0; lines[i] != NULL && *lines[i]; i++)
{
char **fields;
GDateTime *date;
fields = g_strsplit (lines[i], ",", 0);
date = parse_timestamp (fields[0], utc);
while (g_date_time_difference (date, timestamp) > 30 * G_TIME_SPAN_MINUTE)
{
GDateTime *new_timestamp = g_date_time_add_hours (timestamp, 1);
g_date_time_unref (timestamp);
timestamp = new_timestamp;
info = gtk_weather_info_new (timestamp, info);
g_list_store_append (store, info);
g_object_unref (info);
}
info->temperature = parse_temperature (fields[1], info->temperature);
info->weather_type = parse_weather_type (fields[2], fields[3], info->weather_type);
g_date_time_unref (date);
g_strfreev (fields);
}
g_date_time_unref (timestamp);
g_strfreev (lines);
g_bytes_unref (data);
g_time_zone_unref (utc);
return G_LIST_MODEL (store);
}
static void
setup_widget (GtkListItem *list_item,
gpointer unused)
{
GtkWidget *box, *child;
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_list_item_set_child (list_item, box);
child = gtk_label_new (NULL);
gtk_label_set_width_chars (GTK_LABEL (child), 5);
gtk_box_append (GTK_BOX (box), child);
child = gtk_image_new ();
gtk_image_set_icon_size (GTK_IMAGE (child), GTK_ICON_SIZE_LARGE);
gtk_box_append (GTK_BOX (box), child);
child = gtk_label_new (NULL);
gtk_widget_set_vexpand (child, TRUE);
gtk_widget_set_valign (child, GTK_ALIGN_END);
gtk_label_set_width_chars (GTK_LABEL (child), 4);
gtk_box_append (GTK_BOX (box), child);
}
static void
bind_widget (GtkListItem *list_item,
gpointer unused)
{
GtkWidget *box, *child;
GtkWeatherInfo *info;
GDateTime *timestamp;
char *s;
box = gtk_list_item_get_child (list_item);
info = gtk_list_item_get_item (list_item);
child = gtk_widget_get_first_child (box);
timestamp = g_date_time_new_from_unix_utc (info->timestamp);
s = g_date_time_format (timestamp, "%R");
gtk_label_set_text (GTK_LABEL (child), s);
g_free (s);
g_date_time_unref (timestamp);
child = gtk_widget_get_next_sibling (child);
switch (info->weather_type)
{
case GTK_WEATHER_CLEAR:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-clear-symbolic");
break;
case GTK_WEATHER_FEW_CLOUDS:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-few-clouds-symbolic");
break;
case GTK_WEATHER_FOG:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-fog-symbolic");
break;
case GTK_WEATHER_OVERCAST:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-overcast-symbolic");
break;
case GTK_WEATHER_SCATTERED_SHOWERS:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-showers-scattered-symbolic");
break;
case GTK_WEATHER_SHOWERS:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-showers-symbolic");
break;
case GTK_WEATHER_SNOW:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-snow-symbolic");
break;
case GTK_WEATHER_STORM:
gtk_image_set_from_icon_name (GTK_IMAGE (child), "weather-storm-symbolic");
break;
default:
gtk_image_clear (GTK_IMAGE (child));
break;
}
child = gtk_widget_get_next_sibling (child);
s = g_strdup_printf ("%d°", info->temperature);
gtk_label_set_text (GTK_LABEL (child), s);
g_free (s);
}
static GtkWidget *window = NULL;
GtkWidget *
create_weather_view (void)
{
GtkWidget *listview;
GListModel *model, *selection;
listview = gtk_list_view_new_with_factory (
gtk_functions_list_item_factory_new (setup_widget,
bind_widget,
NULL, NULL));
gtk_orientable_set_orientation (GTK_ORIENTABLE (listview), GTK_ORIENTATION_HORIZONTAL);
gtk_list_view_set_show_separators (GTK_LIST_VIEW (listview), TRUE);
model = create_weather_model ();
selection = G_LIST_MODEL (gtk_no_selection_new (model));
gtk_list_view_set_model (GTK_LIST_VIEW (listview), selection);
g_object_unref (selection);
g_object_unref (model);
return listview;
}
GtkWidget *
do_listview_weather (GtkWidget *do_widget)
{
if (window == NULL)
{
GtkWidget *listview, *sw;
window = gtk_window_new ();
gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
gtk_window_set_title (GTK_WINDOW (window), "Weather");
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Weather");
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *) &window);
sw = gtk_scrolled_window_new ();
gtk_window_set_child (GTK_WINDOW (window), sw);
listview = create_weather_view ();
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), listview);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}