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gtk-demo: Populate the weather demo incrementally

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This tests how robust the listview machinery is to
frequent model changes.
This commit is contained in:
Matthias Clasen
2020-06-20 11:55:12 -04:00
parent 677bfe6857
commit 00f0177d25
1 changed files with 75 additions and 39 deletions
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114
demos/gtk-demo/listview_weather.c
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@@ -70,7 +70,6 @@ gtk_weather_info_new (GDateTime *timestamp,
{
result->temperature = copy_from->temperature;
result->weather_type = copy_from->weather_type;
g_object_unref (copy_from);
}
return result;
@@ -142,53 +141,88 @@ parse_temperature (const char *s,
return d;
}
static GListModel *
create_weather_model (void)
typedef struct
{
GListStore *store;
GTimeZone *utc;
GDateTime *timestamp;
GtkWeatherInfo *info;
GTimeZone *utc;
GBytes *data;
char **lines;
guint n;
guint i;
GtkWeatherInfo *info;
} WeatherData;
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);
static void
free_weather_data (gpointer data)
{
WeatherData *wd = data;
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 (wd->store);
g_date_time_unref (wd->timestamp);
g_time_zone_unref (wd->utc);
g_bytes_unref (wd->data);
g_strfreev (wd->lines);
for (i = 0; lines[i] != NULL && *lines[i]; i++)
g_free (wd);
}
static gboolean
add_one_item (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
WeatherData *wd = user_data;
char **fields;
GDateTime *date;
g_print ("%d/%d\n", wd->i, wd->n);
fields = g_strsplit (wd->lines[wd->i], ",", 0);
date = parse_timestamp (fields[0], wd->utc);
while (g_date_time_difference (date, wd->timestamp) > 30 * G_TIME_SPAN_MINUTE)
{
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);
}
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);
GDateTime *new_timestamp = g_date_time_add_hours (wd->timestamp, 1);
g_date_time_unref (wd->timestamp);
wd->timestamp = new_timestamp;
wd->info = gtk_weather_info_new (wd->timestamp, wd->info);
g_list_store_append (wd->store, wd->info);
g_object_unref (wd->info);
}
g_strfreev (lines);
g_bytes_unref (data);
g_time_zone_unref (utc);
wd->info->temperature = parse_temperature (fields[1], wd->info->temperature);
wd->info->weather_type = parse_weather_type (fields[2], fields[3], wd->info->weather_type);
return G_LIST_MODEL (store);
g_date_time_unref (date);
g_strfreev (fields);
wd->i++;
if (wd->i == wd->n)
return G_SOURCE_REMOVE;
return G_SOURCE_CONTINUE;
}
static void
populate_weather_model (GtkWidget *view, GListStore *store)
{
WeatherData *wd;
wd = g_new (WeatherData, 1);
wd->data = g_resources_lookup_data ("/listview_weather/listview_weather.txt", 0, NULL);
wd->lines = g_strsplit (g_bytes_get_data (wd->data, NULL), "\n", 0);
wd->n = g_strv_length (wd->lines);
wd->i = 0;
wd->store = g_object_ref (store);
wd->utc = g_time_zone_new_utc ();
wd->timestamp = g_date_time_new (wd->utc, 2011, 1, 1, 0, 0, 0);
wd->info = gtk_weather_info_new (wd->timestamp, NULL);
g_list_store_append (wd->store, wd->info);
g_object_unref (wd->info);
gtk_widget_add_tick_callback (view, add_one_item, wd, free_weather_data);
}
static void
@@ -279,7 +313,8 @@ GtkWidget *
create_weather_view (void)
{
GtkWidget *listview;
GListModel *model, *selection;
GListStore *store;
GListModel *selection;
listview = gtk_list_view_new_with_factory (
gtk_functions_list_item_factory_new (setup_widget,
@@ -287,11 +322,12 @@ create_weather_view (void)
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));
store = g_list_store_new (GTK_TYPE_WEATHER_INFO);
selection = G_LIST_MODEL (gtk_no_selection_new (G_LIST_MODEL (store)));
gtk_list_view_set_model (GTK_LIST_VIEW (listview), selection);
populate_weather_model (listview, store);
g_object_unref (selection);
g_object_unref (model);
g_object_unref (store);
return listview;
}