Lerking/gtk
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
3153b8565d4052607a34fa7bc0c1ba1a8e4c6962
gtk/demos/gtk-demo/clipboard.c
Benjamin Otte a411959c91 droptarget: Redo 
This is a huge reorganization of GtkDropTarget. I did not know how to
split this up, so it's unfortunately all one commit.

Highlights:

- Split GtkDropTarget into GtkDropTarget and GtkDropTargetAsync
  GtkDropTarget is the simple one that only works with GTypes and offers
  a synchronous interface.
  GtkDropTargetAsync retains the full old functionality and allows
  handling mime types.

- Drop events are handled differently
  Instead of picking a single drop target and sending all DND events to
  it, every event is sent to every drop target. The first one to handle
  the event gets to call gdk_drop_status(), further handlers do not
  interact with the GdkDrop.
  Of course, for the ultimate GDK_DROP_STARTING event, only the first
  one to accept the drop gets to handle it.
  This allows stacking DND event controllers that aren't necessarily
  interested in handling the event or that might decide later to drop
  it.

- Port all widgets to either of those
  Both have a somewhat changed API due to the new event handling.
  For the ones who should use the sync version, lots of cleanup was
  involved to operate on a sync API.
2020-03-02 03:18:55 +01:00

385 lines
12 KiB
C
Raw Blame History

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