mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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388 lines
12 KiB
C
388 lines
12 KiB
C
/* Clipboard
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*
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* GdkClipboard 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 <glib/gi18n.h>
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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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static 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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GdkClipboard *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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/* Set clipboard text */
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gdk_clipboard_set_text (clipboard, gtk_editable_get_text (GTK_EDITABLE (entry)));
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}
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static void
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paste_received (GObject *source_object,
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GAsyncResult *result,
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gpointer user_data)
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{
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GdkClipboard *clipboard;
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GtkWidget *entry;
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char *text;
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GError *error = NULL;
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clipboard = GDK_CLIPBOARD (source_object);
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entry = GTK_WIDGET (user_data);
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/* Get the resulting text of the read operation */
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text = gdk_clipboard_read_text_finish (clipboard, result, &error);
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if (text)
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{
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/* Set the entry text */
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gtk_editable_set_text (GTK_EDITABLE (entry), text);
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g_free (text);
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}
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else
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{
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GtkWidget *dialog;
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/* Show an error about why pasting failed.
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* Usually you probably want to ignore such failures,
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* but for demonstration purposes, we show the error.
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*/
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dialog = gtk_message_dialog_new (GTK_WINDOW (window),
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GTK_DIALOG_DESTROY_WITH_PARENT | GTK_DIALOG_MODAL,
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GTK_MESSAGE_ERROR,
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GTK_BUTTONS_CLOSE,
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"Could not paste text: %s",
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error->message);
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g_signal_connect (dialog, "response",
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G_CALLBACK (gtk_widget_destroy), NULL);
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gtk_widget_show (dialog);
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g_error_free (error);
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}
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}
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static 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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GdkClipboard *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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/* 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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gdk_clipboard_read_text_async (clipboard, NULL, paste_received, entry);
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}
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static GdkPaintable *
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get_image_paintable (GtkImage *image)
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{
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const gchar *icon_name;
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GtkIconTheme *icon_theme;
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GtkIconPaintable *icon;
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switch (gtk_image_get_storage_type (image))
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{
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case GTK_IMAGE_PAINTABLE:
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return g_object_ref (gtk_image_get_paintable (image));
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case GTK_IMAGE_ICON_NAME:
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icon_name = gtk_image_get_icon_name (image);
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icon_theme = gtk_icon_theme_get_for_display (gtk_widget_get_display (GTK_WIDGET (image)));
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icon = gtk_icon_theme_lookup_icon (icon_theme,
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icon_name,
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NULL,
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48, 1,
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gtk_widget_get_direction (GTK_WIDGET (image)),
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0);
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if (icon == NULL)
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return NULL;
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return GDK_PAINTABLE (icon);
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case GTK_IMAGE_EMPTY:
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case GTK_IMAGE_GICON:
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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 (GtkDragSource *source,
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GdkDrag *drag,
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GtkWidget *widget)
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{
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GdkPaintable *paintable;
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paintable = get_image_paintable (GTK_IMAGE (widget));
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if (paintable)
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{
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gtk_drag_source_set_icon (source, paintable, -2, -2);
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g_object_unref (paintable);
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}
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}
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static GdkContentProvider *
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prepare_drag (GtkDragSource *source,
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double x,
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double y,
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GtkWidget *image)
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{
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GdkPaintable *paintable = get_image_paintable (GTK_IMAGE (image));
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if (!GDK_IS_TEXTURE (paintable))
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return NULL;
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return gdk_content_provider_new_typed (GDK_TYPE_TEXTURE, paintable);
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}
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static gboolean
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drag_drop (GtkDropTarget *dest,
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const GValue *value,
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double x,
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double y,
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GtkImage *image)
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{
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GdkTexture *texture = g_value_get_object (value);
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gtk_image_set_from_paintable (GTK_IMAGE (image), GDK_PAINTABLE (texture));
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return TRUE;
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}
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static void
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copy_image (GSimpleAction *action,
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GVariant *value,
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gpointer data)
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{
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GdkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (data));
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GdkPaintable *paintable = get_image_paintable (GTK_IMAGE (data));
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if (GDK_IS_TEXTURE (paintable))
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gdk_clipboard_set_texture (clipboard, GDK_TEXTURE (paintable));
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if (paintable)
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g_object_unref (paintable);
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}
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static void
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paste_image_received (GObject *source,
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GAsyncResult *result,
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gpointer data)
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{
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GdkTexture *texture;
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texture = gdk_clipboard_read_texture_finish (GDK_CLIPBOARD (source), result, NULL);
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if (texture == NULL)
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return;
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gtk_image_set_from_paintable (GTK_IMAGE (data), GDK_PAINTABLE (texture));
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g_object_unref (texture);
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}
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static void
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paste_image (GSimpleAction *action,
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GVariant *value,
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gpointer data)
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{
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GdkClipboard *clipboard = gtk_widget_get_clipboard (GTK_WIDGET (data));
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gdk_clipboard_read_texture_async (clipboard, NULL, paste_image_received, data);
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}
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static void
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pressed_cb (GtkGesture *gesture,
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int n_press,
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double x,
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double y,
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GtkWidget *image)
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{
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GtkWidget *popover;
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GMenu *menu;
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GMenuItem *item;
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menu = g_menu_new ();
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item = g_menu_item_new (_("_Copy"), "clipboard.copy");
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g_menu_append_item (menu, item);
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item = g_menu_item_new (_("_Paste"), "clipboard.paste");
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g_menu_append_item (menu, item);
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popover = gtk_popover_menu_new_from_model (G_MENU_MODEL (menu));
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gtk_widget_set_parent (popover, image);
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gtk_popover_set_pointing_to (GTK_POPOVER (popover), &(GdkRectangle) { x, y, 1, 1});
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gtk_popover_popup (GTK_POPOVER (popover));
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g_object_unref (menu);
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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 *image;
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GtkGesture *gesture;
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GActionEntry entries[] = {
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{ "copy", copy_image, NULL, NULL, NULL },
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{ "paste", paste_image, NULL, NULL, NULL },
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};
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GActionGroup *actions;
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GtkDragSource *source;
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GtkDropTarget *dest;
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window = gtk_window_new ();
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gtk_window_set_display (GTK_WINDOW (window),
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gtk_widget_get_display (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Clipboard");
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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_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_widget_set_margin_start (vbox, 8);
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gtk_widget_set_margin_end (vbox, 8);
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gtk_widget_set_margin_top (vbox, 8);
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gtk_widget_set_margin_bottom (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_container_add (GTK_CONTAINER (vbox), label);
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hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
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gtk_widget_set_margin_start (hbox, 8);
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gtk_widget_set_margin_end (hbox, 8);
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gtk_widget_set_margin_top (hbox, 8);
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gtk_widget_set_margin_bottom (hbox, 8);
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gtk_container_add (GTK_CONTAINER (vbox), hbox);
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/* Create the first entry */
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entry = gtk_entry_new ();
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gtk_container_add (GTK_CONTAINER (hbox), entry);
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/* Create the button */
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button = gtk_button_new_with_mnemonic (_("_Copy"));
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gtk_container_add (GTK_CONTAINER (hbox), button);
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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_container_add (GTK_CONTAINER (vbox), label);
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hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
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gtk_widget_set_margin_start (hbox, 8);
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gtk_widget_set_margin_end (hbox, 8);
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gtk_widget_set_margin_top (hbox, 8);
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gtk_widget_set_margin_bottom (hbox, 8);
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gtk_container_add (GTK_CONTAINER (vbox), hbox);
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/* Create the second entry */
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entry = gtk_entry_new ();
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gtk_container_add (GTK_CONTAINER (hbox), entry);
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/* Create the button */
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button = gtk_button_new_with_mnemonic (_("_Paste"));
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gtk_container_add (GTK_CONTAINER (hbox), button);
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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_container_add (GTK_CONTAINER (vbox), label);
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hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
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gtk_widget_set_margin_start (hbox, 8);
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gtk_widget_set_margin_end (hbox, 8);
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gtk_widget_set_margin_top (hbox, 8);
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gtk_widget_set_margin_bottom (hbox, 8);
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gtk_container_add (GTK_CONTAINER (vbox), hbox);
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/* Create the first image */
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image = gtk_image_new_from_icon_name ("dialog-warning");
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gtk_image_set_pixel_size (GTK_IMAGE (image), 48);
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gtk_container_add (GTK_CONTAINER (hbox), image);
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/* make image a drag source */
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source = gtk_drag_source_new ();
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g_signal_connect (source, "prepare", G_CALLBACK (prepare_drag), NULL);
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g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), image);
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gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (source));
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/* accept drops on image */
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dest = gtk_drop_target_new (GDK_TYPE_TEXTURE, GDK_ACTION_COPY);
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g_signal_connect (dest, "drop", G_CALLBACK (drag_drop), image);
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gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (dest));
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/* context menu on image */
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gesture = gtk_gesture_click_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
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g_signal_connect (gesture, "pressed", G_CALLBACK (pressed_cb), image);
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gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (gesture));
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actions = G_ACTION_GROUP (g_simple_action_group_new ());
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g_action_map_add_action_entries (G_ACTION_MAP (actions), entries, G_N_ELEMENTS (entries), image);
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gtk_widget_insert_action_group (image, "clipboard", actions);
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g_object_unref (actions);
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/* Create the second image */
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image = gtk_image_new_from_icon_name ("process-stop");
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gtk_image_set_pixel_size (GTK_IMAGE (image), 48);
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gtk_container_add (GTK_CONTAINER (hbox), image);
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/* make image a drag source */
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source = gtk_drag_source_new ();
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g_signal_connect (source, "prepare", G_CALLBACK (prepare_drag), NULL);
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g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), image);
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gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (source));
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/* accept drops on image */
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dest = gtk_drop_target_new (GDK_TYPE_TEXTURE, GDK_ACTION_COPY);
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g_signal_connect (dest, "drop", G_CALLBACK (drag_drop), image);
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gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (dest));
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/* context menu on image */
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gesture = gtk_gesture_click_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
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g_signal_connect (gesture, "pressed", G_CALLBACK (pressed_cb), image);
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gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (gesture));
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actions = G_ACTION_GROUP (g_simple_action_group_new ());
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g_action_map_add_action_entries (G_ACTION_MAP (actions), entries, G_N_ELEMENTS (entries), image);
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gtk_widget_insert_action_group (image, "clipboard", actions);
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g_object_unref (actions);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show (window);
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else
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gtk_widget_destroy (window);
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return window;
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}
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