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gtk3/demos/gtk-demo/clipboard.c
Sven Neumann 092187e99c demos/gtk-demo/changedisplay.c demos/gtk-demo/clipboard.c 
2008-08-11  Sven Neumann  <sven@gimp.org>

	* demos/gtk-demo/changedisplay.c
	* demos/gtk-demo/clipboard.c
	* demos/gtk-demo/drawingarea.c
	* demos/gtk-demo/iconview.c
	* demos/gtk-demo/images.c
	* demos/gtk-demo/pixbufs.c: use canonical signal names in the 
demos.


svn path=/trunk/; revision=21074
2008-08-11 19:12:58 +00:00

323 lines
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/* Clipboard
*
* GtkClipboard is used for clipboard handling. This demo shows how to
* copy and paste text to and from the clipboard.
*
* It also shows how to transfer images via the clipboard or via
* drag-and-drop, and how to make clipboard contents persist after
* the application exits. Clipboard persistence requires a clipboard
* manager to run.
*/
#include <gtk/gtk.h>
#include <string.h>
static GtkWidget *window = NULL;
void
copy_button_clicked (GtkWidget *button,
gpointer user_data)
{
GtkWidget *entry;
GtkClipboard *clipboard;
entry = GTK_WIDGET (user_data);
/* Get the clipboard object */
clipboard = gtk_widget_get_clipboard (entry,
GDK_SELECTION_CLIPBOARD);
/* Set clipboard text */
gtk_clipboard_set_text (clipboard, gtk_entry_get_text (GTK_ENTRY (entry)), -1);
}
void
paste_received (GtkClipboard *clipboard,
const gchar *text,
gpointer user_data)
{
GtkWidget *entry;
entry = GTK_WIDGET (user_data);
/* Set the entry text */
if(text)
gtk_entry_set_text (GTK_ENTRY (entry), text);
}
void
paste_button_clicked (GtkWidget *button,
gpointer user_data)
{
GtkWidget *entry;
GtkClipboard *clipboard;
entry = GTK_WIDGET (user_data);
/* Get the clipboard object */
clipboard = gtk_widget_get_clipboard (entry,
GDK_SELECTION_CLIPBOARD);
/* Request the contents of the clipboard, contents_received will be
called when we do get the contents.
*/
gtk_clipboard_request_text (clipboard,
paste_received, entry);
}
static GdkPixbuf *
get_image_pixbuf (GtkImage *image)
{
gchar *stock_id;
GtkIconSize size;
switch (gtk_image_get_storage_type (image))
{
case GTK_IMAGE_PIXBUF:
return g_object_ref (gtk_image_get_pixbuf (image));
case GTK_IMAGE_STOCK:
gtk_image_get_stock (image, &stock_id, &size);
return gtk_widget_render_icon (GTK_WIDGET (image),
stock_id, size, NULL);
default:
g_warning ("Image storage type %d not handled",
gtk_image_get_storage_type (image));
return NULL;
}
}
static void
drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GdkPixbuf *pixbuf;
pixbuf = get_image_pixbuf (GTK_IMAGE (data));
gtk_drag_set_icon_pixbuf (context, pixbuf, -2, -2);
g_object_unref (pixbuf);
}
void
drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
gpointer data)
{
GdkPixbuf *pixbuf;
pixbuf = get_image_pixbuf (GTK_IMAGE (data));
gtk_selection_data_set_pixbuf (selection_data, pixbuf);
g_object_unref (pixbuf);
}
static void
drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
gpointer data)
{
GdkPixbuf *pixbuf;
if (selection_data->length > 0)
{
pixbuf = gtk_selection_data_get_pixbuf (selection_data);
gtk_image_set_from_pixbuf (GTK_IMAGE (data), pixbuf);
g_object_unref (pixbuf);
}
}
static void
copy_image (GtkMenuItem *item,
gpointer data)
{
GtkClipboard *clipboard;
GdkPixbuf *pixbuf;
clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
pixbuf = get_image_pixbuf (GTK_IMAGE (data));
gtk_clipboard_set_image (clipboard, pixbuf);
g_object_unref (pixbuf);
}
static void
paste_image (GtkMenuItem *item,
gpointer data)
{
GtkClipboard *clipboard;
GdkPixbuf *pixbuf;
clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
pixbuf = gtk_clipboard_wait_for_image (clipboard);
if (pixbuf)
{
gtk_image_set_from_pixbuf (GTK_IMAGE (data), pixbuf);
g_object_unref (pixbuf);
}
}
static gboolean
button_press (GtkWidget *widget,
GdkEventButton *button,
gpointer data)
{
GtkWidget *menu;
GtkWidget *item;
if (button->button != 3)
return FALSE;
menu = gtk_menu_new ();
item = gtk_image_menu_item_new_from_stock (GTK_STOCK_COPY, NULL);
g_signal_connect (item, "activate", G_CALLBACK (copy_image), data);
gtk_widget_show (item);
gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
item = gtk_image_menu_item_new_from_stock (GTK_STOCK_PASTE, NULL);
g_signal_connect (item, "activate", G_CALLBACK (paste_image), data);
gtk_widget_show (item);
gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
gtk_menu_popup (GTK_MENU (menu), NULL, NULL, NULL, NULL, 3, button->time);
return TRUE;
}
GtkWidget *
do_clipboard (GtkWidget *do_widget)
{
if (!window)
{
GtkWidget *vbox, *hbox;
GtkWidget *label;
GtkWidget *entry, *button;
GtkWidget *ebox, *image;
GtkClipboard *clipboard;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
gtk_container_add (GTK_CONTAINER (window), vbox);
label = gtk_label_new ("\"Copy\" will copy the text\nin the entry to the clipboard");
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
hbox = gtk_hbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* Create the first entry */
entry = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
/* Create the button */
button = gtk_button_new_from_stock (GTK_STOCK_COPY);
gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
g_signal_connect (button, "clicked",
G_CALLBACK (copy_button_clicked), entry);
label = gtk_label_new ("\"Paste\" will paste the text from the clipboard to the entry");
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
hbox = gtk_hbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* Create the second entry */
entry = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
/* Create the button */
button = gtk_button_new_from_stock (GTK_STOCK_PASTE);
gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
g_signal_connect (button, "clicked",
G_CALLBACK (paste_button_clicked), entry);
label = gtk_label_new ("Images can be transferred via the clipboard, too");
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
hbox = gtk_hbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* Create the first image */
image = gtk_image_new_from_stock (GTK_STOCK_DIALOG_WARNING,
GTK_ICON_SIZE_BUTTON);
ebox = gtk_event_box_new ();
gtk_container_add (GTK_CONTAINER (ebox), image);
gtk_container_add (GTK_CONTAINER (hbox), ebox);
/* make ebox a drag source */
gtk_drag_source_set (ebox, GDK_BUTTON1_MASK, NULL, 0, GDK_ACTION_COPY);
gtk_drag_source_add_image_targets (ebox);
g_signal_connect (ebox, "drag-begin",
G_CALLBACK (drag_begin), image);
g_signal_connect (ebox, "drag-data-get",
G_CALLBACK (drag_data_get), image);
/* accept drops on ebox */
gtk_drag_dest_set (ebox, GTK_DEST_DEFAULT_ALL,
NULL, 0, GDK_ACTION_COPY);
gtk_drag_dest_add_image_targets (ebox);
g_signal_connect (ebox, "drag-data-received",
G_CALLBACK (drag_data_received), image);
/* context menu on ebox */
g_signal_connect (ebox, "button-press-event",
G_CALLBACK (button_press), image);
/* Create the second image */
image = gtk_image_new_from_stock (GTK_STOCK_STOP,
GTK_ICON_SIZE_BUTTON);
ebox = gtk_event_box_new ();
gtk_container_add (GTK_CONTAINER (ebox), image);
gtk_container_add (GTK_CONTAINER (hbox), ebox);
/* make ebox a drag source */
gtk_drag_source_set (ebox, GDK_BUTTON1_MASK, NULL, 0, GDK_ACTION_COPY);
gtk_drag_source_add_image_targets (ebox);
g_signal_connect (ebox, "drag-begin",
G_CALLBACK (drag_begin), image);
g_signal_connect (ebox, "drag-data-get",
G_CALLBACK (drag_data_get), image);
/* accept drops on ebox */
gtk_drag_dest_set (ebox, GTK_DEST_DEFAULT_ALL,
NULL, 0, GDK_ACTION_COPY);
gtk_drag_dest_add_image_targets (ebox);
g_signal_connect (ebox, "drag-data-received",
G_CALLBACK (drag_data_received), image);
/* context menu on ebox */
g_signal_connect (ebox, "button-press-event",
G_CALLBACK (button_press), image);
/* tell the clipboard manager to make the data persistent */
clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
gtk_clipboard_set_can_store (clipboard, NULL, 0);
}
if (!GTK_WIDGET_VISIBLE (window))
gtk_widget_show_all (window);
else
{
gtk_widget_destroy (window);
window = NULL;
}
return window;
}
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