gtk2/examples/listbox-dnd.c

156 lines
4.7 KiB
C
Raw Normal View History

#include <gtk/gtk.h>
static GtkTargetEntry entries[] = {
{ "GTK_LIST_BOX_ROW", GTK_TARGET_SAME_APP, 0 }
};
static void
drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkWidget *row;
GtkAllocation alloc;
cairo_surface_t *surface;
cairo_t *cr;
int x, y;
row = gtk_widget_get_ancestor (widget, GTK_TYPE_LIST_BOX_ROW);
gtk_widget_get_allocation (row, &alloc);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, alloc.width, alloc.height);
cr = cairo_create (surface);
gtk_style_context_add_class (gtk_widget_get_style_context (row), "drag-icon");
gtk_widget_draw (row, cr);
gtk_style_context_remove_class (gtk_widget_get_style_context (row), "drag-icon");
gtk_widget_translate_coordinates (widget, row, 0, 0, &x, &y);
cairo_surface_set_device_offset (surface, -x, -y);
gtk_drag_set_icon_surface (context, surface);
cairo_destroy (cr);
cairo_surface_destroy (surface);
}
void
drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
gpointer data)
{
gtk_selection_data_set (selection_data,
gdk_atom_intern_static_string ("GTK_LIST_BOX_ROW"),
32,
(const guchar *)&widget,
sizeof (gpointer));
}
static void
drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
gpointer data)
{
GtkWidget *target;
GtkWidget *row;
GtkWidget *source;
int pos;
target = widget;
pos = gtk_list_box_row_get_index (GTK_LIST_BOX_ROW (target));
row = (gpointer)* (gpointer*)gtk_selection_data_get_data (selection_data);
source = gtk_widget_get_ancestor (row, GTK_TYPE_LIST_BOX_ROW);
if (source == target)
return;
g_object_ref (source);
gtk_container_remove (GTK_CONTAINER (gtk_widget_get_parent (source)), source);
gtk_list_box_insert (GTK_LIST_BOX (gtk_widget_get_parent (target)), source, pos);
g_object_unref (source);
}
static GtkWidget *
create_row (const gchar *text)
{
GtkWidget *row, *handle, *box, *label, *image;
row = gtk_list_box_row_new ();
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
g_object_set (box, "margin-start", 10, "margin-end", 10, NULL);
gtk_container_add (GTK_CONTAINER (row), box);
handle = gtk_event_box_new ();
image = gtk_image_new_from_icon_name ("open-menu-symbolic", 1);
gtk_container_add (GTK_CONTAINER (handle), image);
gtk_container_add (GTK_CONTAINER (box), handle);
label = gtk_label_new (text);
gtk_container_add_with_properties (GTK_CONTAINER (box), label, "expand", TRUE, NULL);
gtk_drag_source_set (handle, GDK_BUTTON1_MASK, entries, 1, GDK_ACTION_MOVE);
g_signal_connect (handle, "drag-begin", G_CALLBACK (drag_begin), NULL);
g_signal_connect (handle, "drag-data-get", G_CALLBACK (drag_data_get), NULL);
gtk_drag_dest_set (row, GTK_DEST_DEFAULT_ALL, entries, 1, GDK_ACTION_MOVE);
g_signal_connect (row, "drag-data-received", G_CALLBACK (drag_data_received), NULL);
return row;
}
static const char *css =
".drag-icon { "
" background: white; "
" border: 1px solid black; "
"}";
int
main (int argc, char *argv[])
{
GtkWidget *window, *list, *sw, *row;
gint i;
gchar *text;
GtkCssProvider *provider;
gtk_init (NULL, NULL);
provider = gtk_css_provider_new ();
gtk_css_provider_load_from_data (provider, css, -1, NULL);
gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
GTK_STYLE_PROVIDER (provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size (GTK_WINDOW (window), -1, 300);
sw = gtk_scrolled_window_new (NULL, NULL);
gtk_widget_set_hexpand (sw, TRUE);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_NEVER, GTK_POLICY_ALWAYS);
gtk_container_add (GTK_CONTAINER (window), sw);
list = gtk_list_box_new ();
gtk_list_box_set_selection_mode (GTK_LIST_BOX (list), GTK_SELECTION_NONE);
gtk_container_add (GTK_CONTAINER (sw), list);
for (i = 0; i < 20; i++)
{
text = g_strdup_printf ("Row %d", i);
row = create_row (text);
gtk_list_box_insert (GTK_LIST_BOX (list), row, -1);
}
gtk_widget_show_all (window);
gtk_main ();
return 0;
}