gtk2/demos/gtk-demo/iconscroll.c
Benjamin Otte a15fb95c46 gtk-demo: Use normal way to lookup up symbols
We're a normal application, so we can use the normal way to hook up code
into builder files, which is using dlsym() for the function pointers.

There's no need to to extra work exporting static symbols.
2019-12-03 18:12:25 +01:00

230 lines
5.8 KiB
C

/* Benchmark/Scrolling
*
* 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 4
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);
g_object_set (grid, "margin", 10, NULL);
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;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_NEVER,
GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (scrolledwindow), grid);
}
static char *content;
static gsize content_len;
extern void fontify (GtkTextBuffer *buffer);
static void
populate_text (gboolean hilight)
{
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 (hilight)
fontify (buffer);
textview = gtk_text_view_new ();
gtk_text_view_set_buffer (GTK_TEXT_VIEW (textview), buffer);
hincrement = 0;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_NEVER,
GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (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;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (scrolledwindow), image);
}
static void
set_widget_type (int type)
{
if (tick_cb)
gtk_widget_remove_tick_callback (window, tick_cb);
if (gtk_bin_get_child (GTK_BIN (scrolledwindow)))
gtk_container_remove (GTK_CONTAINER (scrolledwindow),
gtk_bin_get_child (GTK_BIN (scrolledwindow)));
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;
default:
g_assert_not_reached ();
}
tick_cb = gtk_widget_add_tick_callback (window, scroll_cb, NULL, NULL);
}
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);
}
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);
}
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_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
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);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_widget_destroy (window);
return window;
}