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gimp/libgimpwidgets/gimppickbutton.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimppickbutton.c
* Copyright (C) 2002 Michael Natterer <mitch@gimp.org>
*
* based on gtk+/gtk/gtkcolorsel.c
*
* 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "gimpwidgetstypes.h"
#include "gimphelpui.h"
#include "gimppickbutton.h"
#include "gimpstock.h"
#include "libgimp/libgimp-intl.h"
enum
{
COLOR_PICKED,
LAST_SIGNAL
};
static void gimp_pick_button_destroy (GtkObject *object);
static void gimp_pick_button_clicked (GtkButton *button);
static gboolean gimp_pick_button_mouse_press (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button);
static gboolean gimp_pick_button_key_press (GtkWidget *invisible,
GdkEventKey *event,
GimpPickButton *button);
static gboolean gimp_pick_button_mouse_motion (GtkWidget *invisible,
GdkEventMotion *event,
GimpPickButton *button);
static gboolean gimp_pick_button_mouse_release (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button);
static void gimp_pick_button_shutdown (GimpPickButton *button);
static void gimp_pick_button_pick (GdkScreen *screen,
gint x_root,
gint y_root,
GimpPickButton *button);
G_DEFINE_TYPE (GimpPickButton, gimp_pick_button, GTK_TYPE_BUTTON)
#define parent_class gimp_pick_button_parent_class
static guint pick_button_signals[LAST_SIGNAL] = { 0 };
static void
gimp_pick_button_class_init (GimpPickButtonClass* klass)
{
GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass);
GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
pick_button_signals[COLOR_PICKED] =
g_signal_new ("color-picked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPickButtonClass, color_picked),
NULL, NULL,
g_cclosure_marshal_VOID__POINTER,
G_TYPE_NONE, 1,
G_TYPE_POINTER);
object_class->destroy = gimp_pick_button_destroy;
button_class->clicked = gimp_pick_button_clicked;
klass->color_picked = NULL;
}
static void
gimp_pick_button_init (GimpPickButton *button)
{
GtkWidget *image;
image = gtk_image_new_from_stock (GIMP_STOCK_COLOR_PICK_FROM_SCREEN,
GTK_ICON_SIZE_BUTTON);
gtk_container_add (GTK_CONTAINER (button), image);
gtk_widget_show (image);
gimp_help_set_help_data (GTK_WIDGET (button),
_("Click the eyedropper, then click a color "
"anywhere on your screen to select that color."),
NULL);
}
static void
gimp_pick_button_destroy (GtkObject *object)
{
GimpPickButton *button = GIMP_PICK_BUTTON (object);
if (button->cursor)
{
gdk_cursor_unref (button->cursor);
button->cursor = NULL;
}
if (button->grab_widget)
{
gtk_widget_destroy (button->grab_widget);
button->grab_widget = NULL;
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
/* public functions */
/**
* gimp_pick_button_new:
*
* Creates a new #GimpPickButton widget.
*
* Returns: A new #GimpPickButton widget.
**/
GtkWidget *
gimp_pick_button_new (void)
{
return g_object_new (GIMP_TYPE_PICK_BUTTON, NULL);
}
/* private functions */
/* cursor stuff will be removed again once the gimpcursor.[ch] utility
* stuff has been moved to libgimpwidgets --mitch
*/
#define DROPPER_WIDTH 17
#define DROPPER_HEIGHT 17
#define DROPPER_X_HOT 2
#define DROPPER_Y_HOT 16
static const guchar dropper_bits[] =
{
0xff, 0x8f, 0x01, 0xff, 0x77, 0x01, 0xff, 0xfb, 0x00, 0xff, 0xf8, 0x00,
0x7f, 0xff, 0x00, 0xff, 0x7e, 0x01, 0xff, 0x9d, 0x01, 0xff, 0xd8, 0x01,
0x7f, 0xd4, 0x01, 0x3f, 0xee, 0x01, 0x1f, 0xff, 0x01, 0x8f, 0xff, 0x01,
0xc7, 0xff, 0x01, 0xe3, 0xff, 0x01, 0xf3, 0xff, 0x01, 0xfd, 0xff, 0x01,
0xff, 0xff, 0x01
};
static const guchar dropper_mask[] =
{
0x00, 0x70, 0x00, 0x00, 0xf8, 0x00, 0x00, 0xfc, 0x01, 0x00, 0xff, 0x01,
0x80, 0xff, 0x01, 0x00, 0xff, 0x00, 0x00, 0x7f, 0x00, 0x80, 0x3f, 0x00,
0xc0, 0x3f, 0x00, 0xe0, 0x13, 0x00, 0xf0, 0x01, 0x00, 0xf8, 0x00, 0x00,
0x7c, 0x00, 0x00, 0x3e, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x0d, 0x00, 0x00,
0x02, 0x00, 0x00
};
static GdkCursor *
make_cursor (void)
{
GdkCursor *cursor;
const GdkColor bg = { 0, 0xffff, 0xffff, 0xffff };
const GdkColor fg = { 0, 0x0000, 0x0000, 0x0000 };
GdkPixmap *pixmap =
gdk_bitmap_create_from_data (NULL,
(gchar *) dropper_bits,
DROPPER_WIDTH, DROPPER_HEIGHT);
GdkPixmap *mask =
gdk_bitmap_create_from_data (NULL,
(gchar *) dropper_mask,
DROPPER_WIDTH, DROPPER_HEIGHT);
cursor = gdk_cursor_new_from_pixmap (pixmap, mask, &fg, &bg,
DROPPER_X_HOT ,DROPPER_Y_HOT);
g_object_unref (pixmap);
g_object_unref (mask);
return cursor;
}
static void
gimp_pick_button_clicked (GtkButton *gtk_button)
{
GimpPickButton *button = GIMP_PICK_BUTTON (gtk_button);
GtkWidget *widget;
guint32 timestamp;
if (! button->cursor)
button->cursor = make_cursor ();
if (! button->grab_widget)
{
button->grab_widget = gtk_invisible_new ();
gtk_widget_add_events (button->grab_widget,
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_POINTER_MOTION_MASK);
gtk_widget_show (button->grab_widget);
}
widget = button->grab_widget;
timestamp = gtk_get_current_event_time ();
if (gdk_keyboard_grab (gtk_widget_get_window (widget), FALSE,
timestamp) != GDK_GRAB_SUCCESS)
{
g_warning ("Failed to grab keyboard to do eyedropper");
return;
}
if (gdk_pointer_grab (gtk_widget_get_window (widget), FALSE,
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_POINTER_MOTION_MASK,
NULL,
button->cursor,
timestamp) != GDK_GRAB_SUCCESS)
{
gdk_display_keyboard_ungrab (gtk_widget_get_display (widget), timestamp);
g_warning ("Failed to grab pointer to do eyedropper");
return;
}
gtk_grab_add (widget);
g_signal_connect (widget, "button-press-event",
G_CALLBACK (gimp_pick_button_mouse_press),
button);
g_signal_connect (widget, "key-press-event",
G_CALLBACK (gimp_pick_button_key_press),
button);
}
static gboolean
gimp_pick_button_mouse_press (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button)
{
if (event->type == GDK_BUTTON_PRESS && event->button == 1)
{
g_signal_connect (invisible, "motion-notify-event",
G_CALLBACK (gimp_pick_button_mouse_motion),
button);
g_signal_connect (invisible, "button-release-event",
G_CALLBACK (gimp_pick_button_mouse_release),
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_press,
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_key_press,
button);
return TRUE;
}
return FALSE;
}
static gboolean
gimp_pick_button_key_press (GtkWidget *invisible,
GdkEventKey *event,
GimpPickButton *button)
{
if (event->keyval == GDK_Escape)
{
gimp_pick_button_shutdown (button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_press,
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_key_press,
button);
return TRUE;
}
return FALSE;
}
static gboolean
gimp_pick_button_mouse_motion (GtkWidget *invisible,
GdkEventMotion *event,
GimpPickButton *button)
{
gint x_root;
gint y_root;
gdk_window_get_origin (event->window, &x_root, &y_root);
x_root += event->x;
y_root += event->y;
gimp_pick_button_pick (gdk_event_get_screen ((GdkEvent *) event),
x_root, y_root, button);
return TRUE;
}
static gboolean
gimp_pick_button_mouse_release (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button)
{
gint x_root;
gint y_root;
if (event->button != 1)
return FALSE;
gdk_window_get_origin (event->window, &x_root, &y_root);
x_root += event->x;
y_root += event->y;
gimp_pick_button_pick (gdk_event_get_screen ((GdkEvent *) event),
x_root, y_root, button);
gimp_pick_button_shutdown (button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_motion,
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_release,
button);
return TRUE;
}
static void
gimp_pick_button_shutdown (GimpPickButton *button)
{
GdkDisplay *display = gtk_widget_get_display (button->grab_widget);
guint32 timestamp = gtk_get_current_event_time ();
gdk_display_keyboard_ungrab (display, timestamp);
gdk_display_pointer_ungrab (display, timestamp);
gtk_grab_remove (button->grab_widget);
}
static void
gimp_pick_button_pick (GdkScreen *screen,
gint x_root,
gint y_root,
GimpPickButton *button)
{
GdkColormap *colormap = gdk_screen_get_system_colormap (screen);
GdkWindow *root_window = gdk_screen_get_root_window (screen);
GdkImage *image;
guint32 pixel;
GdkColor color;
GimpRGB rgb;
image = gdk_drawable_get_image (GDK_DRAWABLE (root_window),
x_root, y_root, 1, 1);
pixel = gdk_image_get_pixel (image, 0, 0);
g_object_unref (image);
gdk_colormap_query_color (colormap, pixel, &color);
gimp_rgba_set (&rgb,
color.red / 65535.0,
color.green / 65535.0,
color.blue / 65535.0,
1.0);
g_signal_emit (button, pick_button_signals[COLOR_PICKED], 0, &rgb);
}
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