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