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#include "gtkcssprovider.h"
#include <gtk/gtk.h>
static GtkRequisition size;
static gint64 start_time;
static gboolean stop_update_size;
// Animated paintable for testing content-invalidating drag surfaces.
#define GTK_TYPE_ANIMATED_ICON (gtk_animated_icon_get_type ())
G_DECLARE_FINAL_TYPE (GtkAnimatedIcon, gtk_animated_icon, GTK, ANIMATED_ICON, GObject)
struct _GtkAnimatedIcon
{
GObject parent_instance;
};
struct _GtkAnimatedIconClass
{
GObjectClass parent_class;
};
static void
gtk_animated_icon_snapshot (GdkPaintable *paintable,
GdkSnapshot *snapshot,
double width,
double height)
{
gint64 now = g_get_monotonic_time ();
float t;
t = fmodf ((now - start_time) / (float) G_TIME_SPAN_SECOND, 1);
if (t >= 0.5)
t = 1 - t;
gtk_snapshot_append_color (snapshot,
&(GdkRGBA) { 0, t + 0.5, 0, 1 },
&GRAPHENE_RECT_INIT (0, 0, width, height));
}
static void
gtk_animated_icon_paintable_init (GdkPaintableInterface *iface)
{
iface->snapshot = gtk_animated_icon_snapshot;
}
G_DEFINE_TYPE_WITH_CODE (GtkAnimatedIcon, gtk_animated_icon, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
gtk_animated_icon_paintable_init))
static void
gtk_animated_icon_class_init (GtkAnimatedIconClass *klass)
{
}
static void
gtk_animated_icon_init (GtkAnimatedIcon *nuclear)
{
}
static gboolean
update_size (GtkWidget *widget, GdkFrameClock *clock, gpointer data)
{
GdkDrag *drag = data;
gint64 now = g_get_monotonic_time ();
float t;
int width, height;
if (stop_update_size)
return G_SOURCE_REMOVE;
t = fmodf ((now - start_time) / (float) G_TIME_SPAN_SECOND, 1);
if (t >= 0.5)
t = 1 - t;
width = size.width + t * 300;
height = size.height + t * 150;
gtk_widget_set_size_request (widget, width, height);
gdk_drag_set_hotspot (drag, width / 2, height / 2);
return G_SOURCE_CONTINUE;
}
static void
drag_begin (GtkDragSource *source,
GdkDrag *drag)
{
GtkWidget *widget;
GtkWidget *icon;
icon = gtk_drag_icon_get_for_drag (drag);
widget = gtk_label_new ("This Should Resize\n\nAnd Stay Centered");
gtk_widget_add_css_class (widget, "dnd");
gtk_widget_get_preferred_size (widget, NULL, &size);
gtk_drag_icon_set_child (GTK_DRAG_ICON (icon), widget);
gtk_widget_set_size_request (widget, size.width, size.height);
gdk_drag_set_hotspot (drag, size.width / 2, size.height / 2);
start_time = g_get_monotonic_time ();
stop_update_size = FALSE;
gtk_widget_add_tick_callback (widget, update_size, drag, NULL);
}
static void
drag_end (GtkDragSource *source,
GdkDrag *drag,
gboolean delete_data,
gboolean data)
{
stop_update_size = TRUE;
}
static gboolean
invalidate_contents (GtkWidget *widget, GdkFrameClock *clock, gpointer data)
{
GdkPaintable *paintable = data;
gdk_paintable_invalidate_contents (paintable);
return G_SOURCE_CONTINUE;
}
static void
drag_begin_non_resizing (GtkDragSource *source,
GdkDrag *drag)
{
GdkPaintable *paintable;
GtkWidget *widget;
int width = 64, height = 32;
paintable = GDK_PAINTABLE (g_object_new (GTK_TYPE_ANIMATED_ICON, NULL));
gtk_drag_icon_set_from_paintable (drag, paintable, width / 2, height / 2);
widget = gtk_drag_icon_get_child (GTK_DRAG_ICON (gtk_drag_icon_get_for_drag (drag)));
gtk_widget_set_size_request (widget, width, height);
gtk_widget_add_tick_callback (widget, invalidate_contents, paintable, NULL);
}
static void
quit_cb (GtkWidget *widget,
gpointer data)
{
gboolean *done = data;
*done = TRUE;
g_main_context_wakeup (NULL);
}
int
main (int argc, char *argv[])
{
GtkCssProvider *provider;
GtkWidget *window;
GtkWidget *box;
GtkWidget *label;
GtkDragSource *source;
GdkContentProvider *content;
gboolean done = FALSE;
gtk_init ();
provider = gtk_css_provider_new ();
gtk_css_provider_load_from_data (provider,
".dnd {"
"background-color: red;"
"border-top: 10px solid rebeccapurple;"
"}",
-1);
gtk_style_context_add_provider_for_display (gdk_display_get_default (),
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
window = gtk_window_new ();
g_signal_connect (window, "destroy", G_CALLBACK (quit_cb), &done);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
// The resizing icon label.
label = gtk_label_new ("Drag Me (Resizing)");
g_object_set (label,
"margin-start", 64,
"margin-end", 64,
"margin-top", 64,
"margin-bottom", 64,
NULL);
source = gtk_drag_source_new ();
content = gdk_content_provider_new_typed (G_TYPE_STRING, "I'm data!");
gtk_drag_source_set_content (source, content);
g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), NULL);
g_signal_connect (source, "drag-end", G_CALLBACK (drag_end), NULL);
gtk_widget_add_controller (label, GTK_EVENT_CONTROLLER (source));
gtk_box_append (GTK_BOX (box), label);
// The non-resizing icon label.
label = gtk_label_new ("Drag Me (Non-Resizing)");
g_object_set (label,
"margin-start", 64,
"margin-end", 64,
"margin-top", 64,
"margin-bottom", 64,
NULL);
source = gtk_drag_source_new ();
content = gdk_content_provider_new_typed (G_TYPE_STRING, "I'm data!");
gtk_drag_source_set_content (source, content);
g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin_non_resizing), NULL);
gtk_widget_add_controller (label, GTK_EVENT_CONTROLLER (source));
gtk_box_append (GTK_BOX (box), label);
gtk_window_set_child (GTK_WINDOW (window), box);
gtk_window_present (GTK_WINDOW (window));
while (!done)
g_main_context_iteration (NULL, TRUE);
return 0;
}
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