gtk2/tests/testdnd2.c
2020-01-08 18:48:20 -05:00

322 lines
8.6 KiB
C

#include <unistd.h>
#include <gtk/gtk.h>
static GdkPaintable *
get_image_paintable (GtkImage *image,
int *out_size)
{
GtkIconTheme *icon_theme;
const char *icon_name;
int width = 48;
GdkPaintable *paintable;
GtkIconInfo *icon_info;
switch (gtk_image_get_storage_type (image))
{
case GTK_IMAGE_PAINTABLE:
paintable = gtk_image_get_paintable (image);
*out_size = gdk_paintable_get_intrinsic_width (paintable);
return g_object_ref (paintable);
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)));
*out_size = width;
icon_info = gtk_icon_theme_lookup_icon (icon_theme, icon_name, width, GTK_ICON_LOOKUP_GENERIC_FALLBACK);
paintable = gtk_icon_info_load_icon (icon_info, NULL);
g_object_unref (icon_info);
return paintable;
default:
g_warning ("Image storage type %d not handled",
gtk_image_get_storage_type (image));
return NULL;
}
}
enum {
TOP_LEFT,
CENTER,
BOTTOM_RIGHT
};
void
image_drag_data_get (GtkWidget *widget,
GdkDrag *drag,
GtkSelectionData *selection_data,
gpointer data)
{
GdkPaintable *paintable;
const gchar *name;
int size;
if (gtk_selection_data_targets_include_image (selection_data, TRUE))
{
paintable = get_image_paintable (GTK_IMAGE (data), &size);
if (GDK_IS_TEXTURE (paintable))
gtk_selection_data_set_texture (selection_data, GDK_TEXTURE (paintable));
if (paintable)
g_object_unref (paintable);
}
else if (gtk_selection_data_targets_include_text (selection_data))
{
if (gtk_image_get_storage_type (GTK_IMAGE (data)) == GTK_IMAGE_ICON_NAME)
name = gtk_image_get_icon_name (GTK_IMAGE (data));
else
name = "Boo!";
gtk_selection_data_set_text (selection_data, name, -1);
}
else
{
g_assert_not_reached ();
}
}
static void
got_texture (GObject *source,
GAsyncResult *result,
gpointer data)
{
GdkDrop *drop = GDK_DROP (source);
GtkWidget *image = data;
const GValue *value;
GError *error = NULL;
value = gdk_drop_read_value_finish (drop, result, &error);
if (value)
{
GdkTexture *texture = g_value_get_object (value);
gtk_image_set_from_paintable (GTK_IMAGE (image), GDK_PAINTABLE (texture));
gdk_drop_finish (drop, GDK_ACTION_COPY);
}
else
{
g_print ("Failed to get data: %s\n", error->message);
g_error_free (error);
gdk_drop_finish (drop, 0);
}
}
static gboolean
image_drag_drop (GtkDropTarget *dest,
int x,
int y,
gpointer data)
{
GdkDrop *drop = gtk_drop_target_get_drop (dest);
if (gdk_drop_has_value (drop, GDK_TYPE_TEXTURE))
{
gdk_drop_read_value_async (drop, GDK_TYPE_TEXTURE, G_PRIORITY_DEFAULT, NULL, got_texture, data);
return TRUE;
}
return FALSE;
}
static void
update_source_icon (GtkDragSource *source,
const char *icon_name,
int hotspot)
{
GdkPaintable *paintable;
int hot_x, hot_y;
int size = 48;
paintable = gtk_icon_theme_load_icon (gtk_icon_theme_get_default (),
icon_name, size, 0, NULL);
switch (hotspot)
{
default:
case TOP_LEFT:
hot_x = 0;
hot_y = 0;
break;
case CENTER:
hot_x = size / 2;
hot_y = size / 2;
break;
case BOTTOM_RIGHT:
hot_x = size;
hot_y = size;
break;
}
gtk_drag_source_set_icon (source, paintable, hot_x, hot_y);
g_object_unref (paintable);
}
static GBytes *
get_data (const char *mimetype,
gpointer data)
{
GtkWidget *image = data;
GdkContentFormats *formats;
gboolean want_text;
formats = gdk_content_formats_new (NULL, 0);
formats = gtk_content_formats_add_text_targets (formats);
want_text = gdk_content_formats_contain_mime_type (formats, mimetype);
gdk_content_formats_unref (formats);
g_print ("get data called for %s\n", mimetype);
if (want_text)
{
const char *text = gtk_image_get_icon_name (GTK_IMAGE (image));
return g_bytes_new (text, strlen (text) + 1);
}
else if (strcmp (mimetype, "image/png") == 0)
{
int size;
GdkPaintable *paintable = get_image_paintable (GTK_IMAGE (image), &size);
if (GDK_IS_TEXTURE (paintable))
{
char *name = g_strdup ("drag-data-XXXXXX");
int fd;
char *data;
gsize size;
// FIXME: this is horrible
fd = g_mkstemp (name);
close (fd);
gdk_texture_save_to_png (GDK_TEXTURE (paintable), name);
g_file_get_contents (name, &data, &size, NULL);
g_free (name);
return g_bytes_new_take (data, size);
}
g_clear_object (&paintable);
}
return NULL;
}
static void
drag_begin (GtkDragSource *source)
{
g_print ("drag begin\n");
}
static void
drag_end (GtkDragSource *source)
{
g_print ("drag end\n");
}
static gboolean
drag_failed (GtkDragSource *source, GdkDragCancelReason reason)
{
g_print ("drag failed: %d\n", reason);
return FALSE;
}
GtkWidget *
make_image (const gchar *icon_name, int hotspot)
{
GtkWidget *image;
GtkDragSource *source;
GtkDropTarget *dest;
GdkContentFormats *formats;
GdkContentProvider *content;
image = gtk_image_new_from_icon_name (icon_name);
gtk_image_set_icon_size (GTK_IMAGE (image), GTK_ICON_SIZE_LARGE);
formats = gdk_content_formats_new (NULL, 0);
formats = gtk_content_formats_add_image_targets (formats, FALSE);
formats = gtk_content_formats_add_text_targets (formats);
content = gdk_content_provider_new_with_formats (formats, get_data, image);
source = gtk_drag_source_new (content, GDK_ACTION_COPY);
g_object_unref (content);
update_source_icon (source, icon_name, hotspot);
g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), NULL);
g_signal_connect (source, "drag-end", G_CALLBACK (drag_end), NULL);
g_signal_connect (source, "drag-failed", G_CALLBACK (drag_failed), NULL);
gtk_drag_source_attach (source, image, GDK_BUTTON1_MASK);
dest = gtk_drop_target_new (GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_HIGHLIGHT, formats, GDK_ACTION_COPY);
g_signal_connect (dest, "drag-drop", G_CALLBACK (image_drag_drop), image);
gtk_drop_target_attach (dest, image);
gdk_content_formats_unref (formats);
return image;
}
static void
spinner_drag_begin (GtkDragSource *source,
GtkWidget *widget)
{
GdkPaintable *paintable;
paintable = gtk_widget_paintable_new (widget);
gtk_drag_source_set_icon (source, paintable, 0, 0);
g_object_unref (paintable);
}
static GtkWidget *
make_spinner (void)
{
GtkWidget *spinner;
GtkDragSource *source;
GdkContentProvider *content;
GValue value = G_VALUE_INIT;
spinner = gtk_spinner_new ();
gtk_spinner_start (GTK_SPINNER (spinner));
g_value_init (&value, G_TYPE_STRING);
g_value_set_string (&value, "ACTIVE");
content = gdk_content_provider_new_for_value (&value);
source = gtk_drag_source_new (content, GDK_ACTION_COPY);
g_signal_connect (source, "drag-begin", G_CALLBACK (spinner_drag_begin), spinner);
gtk_drag_source_attach (source, spinner, GDK_BUTTON1_MASK);
g_object_unref (content);
g_value_unset (&value);
return spinner;
}
int
main (int argc, char *Argv[])
{
GtkWidget *window;
GtkWidget *grid;
GtkWidget *entry;
gtk_init ();
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Drag And Drop");
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
grid = gtk_grid_new ();
g_object_set (grid,
"margin", 20,
"row-spacing", 20,
"column-spacing", 20,
NULL);
gtk_container_add (GTK_CONTAINER (window), grid);
gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-warning", TOP_LEFT), 0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image ("process-stop", BOTTOM_RIGHT), 1, 0, 1, 1);
entry = gtk_entry_new ();
gtk_grid_attach (GTK_GRID (grid), entry, 0, 1, 2, 1);
gtk_grid_attach (GTK_GRID (grid), make_spinner (), 0, 2, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image ("weather-clear", CENTER), 1, 2, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-question", TOP_LEFT), 0, 3, 1, 1);
gtk_grid_attach (GTK_GRID (grid), make_image ("dialog-information", CENTER), 1, 3, 1, 1);
gtk_widget_show (window);
gtk_main ();
return 0;
}