gtk2/demos/gtk-demo/iconscroll.c
Matthias Clasen d732c869c2 gtk-demo: Add keywords to demos
Add the names of the main widgets as keywords to
our demos, but also things like "game". This helps
finding relevant demos in our growing list. You
can now for example type "label", and find the
"error states" and "links" demos showing GtkLabel
features.
2020-09-13 15:00:14 -04:00

288 lines
7.4 KiB
C

/* Benchmark/Scrolling
* #Keywords: GtkScrolledWindow
*
* This demo scrolls a view with various content.
*/
#include <gtk/gtk.h>
static guint tick_cb;
static GtkAdjustment *hadjustment;
static GtkAdjustment *vadjustment;
static GtkWidget *window = NULL;
static GtkWidget *scrolledwindow;
static int selected;
#define N_WIDGET_TYPES 6
static int hincrement = 5;
static int vincrement = 5;
static gboolean
scroll_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer data)
{
double value;
value = gtk_adjustment_get_value (vadjustment);
if (value + vincrement <= gtk_adjustment_get_lower (vadjustment) ||
(value + vincrement >= gtk_adjustment_get_upper (vadjustment) - gtk_adjustment_get_page_size (vadjustment)))
vincrement = - vincrement;
gtk_adjustment_set_value (vadjustment, value + vincrement);
value = gtk_adjustment_get_value (hadjustment);
if (value + hincrement <= gtk_adjustment_get_lower (hadjustment) ||
(value + hincrement >= gtk_adjustment_get_upper (hadjustment) - gtk_adjustment_get_page_size (hadjustment)))
hincrement = - hincrement;
gtk_adjustment_set_value (hadjustment, value + hincrement);
return G_SOURCE_CONTINUE;
}
extern GtkWidget *create_icon (void);
static void
populate_icons (void)
{
GtkWidget *grid;
int top, left;
grid = gtk_grid_new ();
gtk_widget_set_halign (grid, GTK_ALIGN_CENTER);
gtk_widget_set_margin_start (grid, 10);
gtk_widget_set_margin_end (grid, 10);
gtk_widget_set_margin_top (grid, 10);
gtk_widget_set_margin_bottom (grid, 10);
gtk_grid_set_row_spacing (GTK_GRID (grid), 10);
gtk_grid_set_column_spacing (GTK_GRID (grid), 10);
for (top = 0; top < 100; top++)
for (left = 0; left < 15; left++)
gtk_grid_attach (GTK_GRID (grid), create_icon (), left, top, 1, 1);
hincrement = 0;
vincrement = 5;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_NEVER,
GTK_POLICY_AUTOMATIC);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolledwindow), grid);
}
static char *content;
static gsize content_len;
extern void fontify (const char *format, GtkTextBuffer *buffer);
static void
populate_text (gboolean highlight)
{
GtkWidget *textview;
GtkTextBuffer *buffer;
if (!content)
{
GBytes *bytes;
bytes = g_resources_lookup_data ("/sources/font_features.c", 0, NULL);
content = g_bytes_unref_to_data (bytes, &content_len);
}
buffer = gtk_text_buffer_new (NULL);
gtk_text_buffer_set_text (buffer, content, (int)content_len);
if (highlight)
fontify ("c", buffer);
textview = gtk_text_view_new ();
gtk_text_view_set_buffer (GTK_TEXT_VIEW (textview), buffer);
hincrement = 0;
vincrement = 5;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_NEVER,
GTK_POLICY_AUTOMATIC);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolledwindow), textview);
}
static void
populate_image (void)
{
GtkWidget *image;
if (!content)
{
GBytes *bytes;
bytes = g_resources_lookup_data ("/sources/font_features.c", 0, NULL);
content = g_bytes_unref_to_data (bytes, &content_len);
}
image = gtk_picture_new_for_resource ("/sliding_puzzle/portland-rose.jpg");
gtk_picture_set_can_shrink (GTK_PICTURE (image), FALSE);
hincrement = 5;
vincrement = 5;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolledwindow), image);
}
extern GtkWidget *create_weather_view (void);
static void
populate_list (void)
{
GtkWidget *list;
list = create_weather_view ();
hincrement = 5;
vincrement = 0;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolledwindow), list);
}
extern GtkWidget *create_color_grid (void);
extern GListModel *gtk_color_list_new (guint size);
static void
populate_grid (void)
{
GtkWidget *list;
GtkNoSelection *selection;
list = create_color_grid ();
selection = gtk_no_selection_new (gtk_color_list_new (2097152));
gtk_grid_view_set_model (GTK_GRID_VIEW (list), GTK_SELECTION_MODEL (selection));
g_object_unref (selection);
hincrement = 0;
vincrement = 5;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolledwindow), list);
}
static void
set_widget_type (int type)
{
if (tick_cb)
gtk_widget_remove_tick_callback (window, tick_cb);
if (gtk_scrolled_window_get_child (GTK_SCROLLED_WINDOW (scrolledwindow)))
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolledwindow), NULL);
selected = type;
switch (selected)
{
case 0:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling icons");
populate_icons ();
break;
case 1:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling plain text");
populate_text (FALSE);
break;
case 2:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling complex text");
populate_text (TRUE);
break;
case 3:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling a big image");
populate_image ();
break;
case 4:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling a list");
populate_list ();
break;
case 5:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling a grid");
populate_grid ();
break;
default:
g_assert_not_reached ();
}
tick_cb = gtk_widget_add_tick_callback (window, scroll_cb, NULL, NULL);
}
G_MODULE_EXPORT void
iconscroll_next_clicked_cb (GtkButton *source,
gpointer user_data)
{
int new_index;
if (selected + 1 >= N_WIDGET_TYPES)
new_index = 0;
else
new_index = selected + 1;
set_widget_type (new_index);
}
G_MODULE_EXPORT void
iconscroll_prev_clicked_cb (GtkButton *source,
gpointer user_data)
{
int new_index;
if (selected - 1 < 0)
new_index = N_WIDGET_TYPES - 1;
else
new_index = selected - 1;
set_widget_type (new_index);
}
G_MODULE_EXPORT GtkWidget *
do_iconscroll (GtkWidget *do_widget)
{
if (!window)
{
GtkBuilder *builder;
builder = gtk_builder_new_from_resource ("/iconscroll/iconscroll.ui");
window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
scrolledwindow = GTK_WIDGET (gtk_builder_get_object (builder, "scrolledwindow"));
gtk_widget_realize (window);
hadjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "hadjustment"));
vadjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "vadjustment"));
set_widget_type (0);
g_object_unref (builder);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}