gtk/tests/testdnd2.c

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#include <gtk/gtk.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#elif defined (G_OS_WIN32)
#include <io.h>
#endif
static GdkTexture *
render_paintable_to_texture (GdkPaintable *paintable)
{
GtkSnapshot *snapshot;
GskRenderNode *node;
int width, height;
cairo_surface_t *surface;
cairo_t *cr;
GdkTexture *texture;
GBytes *bytes;
width = gdk_paintable_get_intrinsic_width (paintable);
if (width == 0)
width = 32;
height = gdk_paintable_get_intrinsic_height (paintable);
if (height == 0)
height = 32;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
snapshot = gtk_snapshot_new ();
gdk_paintable_snapshot (paintable, snapshot, width, height);
node = gtk_snapshot_free_to_node (snapshot);
cr = cairo_create (surface);
gsk_render_node_draw (node, cr);
cairo_destroy (cr);
gsk_render_node_unref (node);
bytes = g_bytes_new_with_free_func (cairo_image_surface_get_data (surface),
cairo_image_surface_get_height (surface)
* cairo_image_surface_get_stride (surface),
(GDestroyNotify) cairo_surface_destroy,
cairo_surface_reference (surface));
texture = gdk_memory_texture_new (cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface),
GDK_MEMORY_DEFAULT,
bytes,
cairo_image_surface_get_stride (surface));
g_bytes_unref (bytes);
cairo_surface_destroy (surface);
return texture;
}
static GdkTexture *
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get_image_texture (GtkImage *image)
{
GtkIconTheme *icon_theme;
const char *icon_name;
int width = 48;
GdkPaintable *paintable = NULL;
GdkTexture *texture = NULL;
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GtkIconPaintable *icon;
switch (gtk_image_get_storage_type (image))
{
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case GTK_IMAGE_PAINTABLE:
paintable = gtk_image_get_paintable (image);
break;
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,
width, 1,
gtk_widget_get_direction (GTK_WIDGET (image)),
0);
paintable = GDK_PAINTABLE (icon);
break;
case GTK_IMAGE_GICON:
case GTK_IMAGE_EMPTY:
default:
g_warning ("Image storage type %d not handled",
gtk_image_get_storage_type (image));
}
if (paintable)
texture = render_paintable_to_texture (paintable);
g_object_unref (paintable);
return texture;
}
enum {
TOP_LEFT,
CENTER,
BOTTOM_RIGHT
};
static void
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got_texture (GObject *source,
GAsyncResult *result,
gpointer data)
{
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GdkDrop *drop = GDK_DROP (source);
GtkWidget *image = data;
const GValue *value;
GError *error = NULL;
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value = gdk_drop_read_value_finish (drop, result, &error);
if (value)
{
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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);
}
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else
{
g_error_free (error);
gdk_drop_finish (drop, 0);
}
g_object_set_data (G_OBJECT (image), "drop", NULL);
}
static void
perform_drop (GdkDrop *drop,
GtkWidget *image)
{
if (gdk_content_formats_contain_gtype (gdk_drop_get_formats (drop), GDK_TYPE_TEXTURE))
gdk_drop_read_value_async (drop, GDK_TYPE_TEXTURE, G_PRIORITY_DEFAULT, NULL, got_texture, image);
else
{
gdk_drop_finish (drop, 0);
g_object_set_data (G_OBJECT (image), "drop", NULL);
}
}
static void
do_copy (GtkWidget *button)
{
GtkWidget *popover = gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER);
GtkWidget *image = gtk_widget_get_parent (popover);
GdkDrop *drop = GDK_DROP (g_object_get_data (G_OBJECT (image), "drop"));
gtk_popover_popdown (GTK_POPOVER (popover));
perform_drop (drop, image);
}
static void
do_cancel (GtkWidget *button)
{
GtkWidget *popover = gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER);
GtkWidget *image = gtk_widget_get_parent (popover);
GdkDrop *drop = GDK_DROP (g_object_get_data (G_OBJECT (image), "drop"));
gtk_popover_popdown (GTK_POPOVER (popover));
gdk_drop_finish (drop, 0);
g_object_set_data (G_OBJECT (image), "drop", NULL);
}
static void
ask_actions (GdkDrop *drop,
GtkWidget *image)
{
GtkWidget *popover, *box, *button;
popover = g_object_get_data (G_OBJECT (image), "popover");
if (!popover)
{
popover = gtk_popover_new ();
gtk_widget_set_parent (popover, image);
g_object_set_data (G_OBJECT (image), "popover", popover);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_popover_set_child (GTK_POPOVER (popover), box);
button = gtk_button_new_with_label ("Copy");
g_signal_connect (button, "clicked", G_CALLBACK (do_copy), NULL);
gtk_box_append (GTK_BOX (box), button);
button = gtk_button_new_with_label ("Move");
g_signal_connect (button, "clicked", G_CALLBACK (do_copy), NULL);
gtk_box_append (GTK_BOX (box), button);
button = gtk_button_new_with_label ("Cancel");
g_signal_connect (button, "clicked", G_CALLBACK (do_cancel), NULL);
gtk_box_append (GTK_BOX (box), button);
}
gtk_popover_popup (GTK_POPOVER (popover));
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}
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static gboolean
delayed_deny (gpointer data)
{
GtkDropTargetAsync *dest = data;
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GtkWidget *image = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (dest));
GdkDrop *drop = GDK_DROP (g_object_get_data (G_OBJECT (image), "drop"));
if (drop)
{
g_print ("denying drop, late\n");
gtk_drop_target_async_reject_drop (dest, drop);
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}
return G_SOURCE_REMOVE;
}
static gboolean
image_drag_accept (GtkDropTargetAsync *dest,
GdkDrop *drop,
gpointer data)
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{
GtkWidget *image = data;
g_object_set_data_full (G_OBJECT (image), "drop", g_object_ref (drop), g_object_unref);
g_print ("accept\n");
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g_timeout_add (1000, delayed_deny, dest);
return TRUE;
}
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static gboolean
image_drag_drop (GtkDropTarget *dest,
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GdkDrop *drop,
double x,
double y,
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gpointer data)
{
GtkWidget *image = data;
GdkDragAction action = gdk_drop_get_actions (drop);
const char *name[] = { "copy", "move", "link", "ask" };
g_object_set_data_full (G_OBJECT (image), "drop", g_object_ref (drop), g_object_unref);
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g_print ("drop, actions: ");
for (guint i = 0; i < 4; i++)
{
if (action & (1 << i))
{
if (i > 0)
g_print (", ");
g_print ("%s", name[i]);
}
}
g_print ("\n");
if (!gdk_drag_action_is_unique (action))
ask_actions (drop, image);
else
perform_drop (drop, image);
return TRUE;
}
static void
update_source_icon (GtkDragSource *source,
const char *icon_name,
int hotspot)
{
GtkWidget *widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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GtkIconPaintable *icon;
int hot_x, hot_y;
int size = 48;
if (widget == NULL)
return;
icon = gtk_icon_theme_lookup_icon (gtk_icon_theme_get_for_display (gtk_widget_get_display (widget)),
icon_name,
NULL,
size, 1,
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gtk_widget_get_direction (widget),
0);
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, GDK_PAINTABLE (icon), hot_x, hot_y);
g_object_unref (icon);
}
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static GdkContentProvider *
drag_prepare (GtkDragSource *source,
double x,
double y)
{
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GtkImage *image = GTK_IMAGE (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source)));
GdkTexture *texture;
GdkContentProvider *content;
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content = gdk_content_provider_new_typed (G_TYPE_STRING, gtk_image_get_icon_name (GTK_IMAGE (image)));
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texture = get_image_texture (image);
if (texture)
{
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content = gdk_content_provider_new_union ((GdkContentProvider *[2]) {
gdk_content_provider_new_typed (GDK_TYPE_TEXTURE, texture),
content,
}, 2);
g_object_unref (texture);
}
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return content;
}
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_cancel (GtkDragSource *source,
GdkDrag *drag,
GdkDragCancelReason reason)
{
const char *msg[] = { "no target", "user cancelled", "error" };
g_print ("drag failed: %s\n", msg[reason]);
return FALSE;
}
static GtkWidget *
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make_image (const char *icon_name, int hotspot)
{
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GtkWidget *image;
GtkDragSource *source;
GtkDropTargetAsync *dest;
GdkContentFormats *formats;
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GdkContentFormatsBuilder *builder;
image = gtk_image_new_from_icon_name (icon_name);
gtk_image_set_icon_size (GTK_IMAGE (image), GTK_ICON_SIZE_LARGE);
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builder = gdk_content_formats_builder_new ();
gdk_content_formats_builder_add_gtype (builder, GDK_TYPE_TEXTURE);
gdk_content_formats_builder_add_gtype (builder, G_TYPE_STRING);
formats = gdk_content_formats_builder_free_to_formats (builder);
source = gtk_drag_source_new ();
gtk_drag_source_set_actions (source, GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_ASK);
update_source_icon (source, icon_name, hotspot);
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g_signal_connect (source, "prepare", G_CALLBACK (drag_prepare), NULL);
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-cancel", G_CALLBACK (drag_cancel), NULL);
gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (source));
dest = gtk_drop_target_async_new (formats, GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_ASK);
g_signal_connect (dest, "accept", G_CALLBACK (image_drag_accept), image);
g_signal_connect (dest, "drop", G_CALLBACK (image_drag_drop), image);
gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (dest));
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return image;
}
static void
spinner_drag_begin (GtkDragSource *source,
GdkDrag *drag,
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)
{
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GtkWidget *spinner;
GtkDragSource *source;
GdkContentProvider *content;
spinner = gtk_spinner_new ();
gtk_spinner_start (GTK_SPINNER (spinner));
content = gdk_content_provider_new_typed (G_TYPE_STRING, "ACTIVE");
source = gtk_drag_source_new ();
gtk_drag_source_set_content (source, content);
g_signal_connect (source, "drag-begin", G_CALLBACK (spinner_drag_begin), spinner);
gtk_widget_add_controller (spinner, GTK_EVENT_CONTROLLER (source));
g_object_unref (content);
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return spinner;
}
int
main (int argc, char *Argv[])
{
GtkWidget *window;
GtkWidget *grid;
GtkWidget *entry;
gtk_init ();
window = gtk_window_new ();
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-start", 20,
"margin-end", 20,
"margin-top", 20,
"margin-bottom", 20,
"row-spacing", 20,
"column-spacing", 20,
NULL);
gtk_window_set_child (GTK_WINDOW (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);
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gtk_window_present (GTK_WINDOW (window));
while (TRUE)
g_main_context_iteration (NULL, TRUE);
return 0;
}