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/*
* glade-dnd.c
*
* Copyright (C) 2013 Juan Pablo Ugarte
*
* Authors:
* Juan Pablo Ugarte <juanpablougarte@gmail.com>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "glade.h"
#include "glade-dnd.h"
GtkTargetEntry *
_glade_dnd_get_target (void)
{
static GtkTargetEntry target = {GLADE_DND_TARGET_DATA, GTK_TARGET_SAME_APP, GLADE_DND_INFO_DATA};
return ⌖
}
void
_glade_dnd_dest_set (GtkWidget *target)
{
gtk_drag_dest_set (target, 0, _glade_dnd_get_target (), 1, GDK_ACTION_MOVE | GDK_ACTION_COPY);
}
GObject *
_glade_dnd_get_data (GdkDragContext *context,
GtkSelectionData *selection,
guint info)
{
GdkAtom target = gtk_selection_data_get_target (selection);
gchar *target_name = gdk_atom_name (target);
gboolean is_target_data = (g_strcmp0 (target_name, GLADE_DND_TARGET_DATA) == 0);
g_free (target_name);
if (info == GLADE_DND_INFO_DATA && is_target_data)
{
const guchar *data = gtk_selection_data_get_data (selection);
if (data)
return *((GObject **)data);
}
return NULL;
}
void
_glade_dnd_set_data (GtkSelectionData *selection, GObject *data)
{
static GdkAtom type = 0;
if (!type)
type = gdk_atom_intern_static_string (GLADE_DND_TARGET_DATA);
gtk_selection_data_set (selection, type, sizeof (gpointer),
(const guchar *)&data,
sizeof (gpointer));
}
static gboolean
on_drag_icon_draw (GtkWidget *widget, cairo_t *cr)
{
GtkStyleContext *context = gtk_widget_get_style_context (widget);
cairo_pattern_t *gradient;
GtkAllocation alloc;
gint x, y, w, h;
gdouble h2;
GdkRGBA bg;
/* Not needed acording to GtkWidget:draw documentation
* But seems like there is a bug when used as a drag_icon that makes the
* cairo translation used here persist when drawing children.
*/
cairo_save (cr);
/* Clear BG */
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
gtk_widget_get_allocation (widget, &alloc);
x = alloc.x;
y = alloc.y;
w = alloc.width;
h = alloc.height;
h2 = h/2.0;
gtk_style_context_get_background_color (context, gtk_style_context_get_state (context), &bg);
gradient = cairo_pattern_create_linear (x, y, x, y+h);
cairo_pattern_add_color_stop_rgba (gradient, 0, bg.red, bg.green, bg.blue, 0);
cairo_pattern_add_color_stop_rgba (gradient, .5, bg.red, bg.green, bg.blue, .8);
cairo_pattern_add_color_stop_rgba (gradient, 1, bg.red, bg.green, bg.blue, 0);
cairo_set_source (cr, gradient);
cairo_rectangle (cr, x+h2, y, w-h, h);
cairo_fill (cr);
cairo_pattern_destroy (gradient);
gradient = cairo_pattern_create_radial (x+h2, y+h2, 0, x+h2, y+h2, h2);
cairo_pattern_add_color_stop_rgba (gradient, 0, bg.red, bg.green, bg.blue, .8);
cairo_pattern_add_color_stop_rgba (gradient, 1, bg.red, bg.green, bg.blue, 0);
cairo_set_source (cr, gradient);
cairo_rectangle (cr, x, y, h2, h);
cairo_fill (cr);
cairo_translate (cr, w-h, 0);
cairo_set_source (cr, gradient);
cairo_rectangle (cr, x+h2, y, h2, h);
cairo_fill (cr);
cairo_pattern_destroy (gradient);
cairo_restore (cr);
return FALSE;
}
void
_glade_dnd_set_icon_widget (GdkDragContext *context,
const gchar *icon_name,
const gchar *description)
{
GtkWidget *window, *box, *label, *icon;
GdkScreen *screen;
GdkVisual *visual;
screen = gdk_window_get_screen (gdk_drag_context_get_source_window (context));
window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
gtk_window_set_screen (GTK_WINDOW (window), screen);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
gtk_container_set_border_width (GTK_CONTAINER (box), 12);
icon = gtk_image_new_from_icon_name (icon_name, GTK_ICON_SIZE_BUTTON);
gtk_widget_set_opacity (icon, .8);
label = gtk_label_new (description);
gtk_box_pack_start (GTK_BOX (box), icon, FALSE, TRUE, 0);
gtk_box_pack_start (GTK_BOX (box), label, FALSE, TRUE, 0);
gtk_widget_show_all (box);
gtk_container_add (GTK_CONTAINER (window), box);
if ((visual = gdk_screen_get_rgba_visual (screen)))
{
gtk_widget_set_visual (window, visual);
gtk_widget_set_app_paintable (window, TRUE);
g_signal_connect (window, "draw", G_CALLBACK (on_drag_icon_draw), NULL);
}
g_object_ref_sink (window);
gtk_drag_set_icon_widget (context, window, 0, 0);
g_object_unref (window);
}
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