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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 <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpcolor/gimpcolor.h"
#include "gimpwidgetstypes.h"
#include "gimpcairo-utils.h"
#include "gimphelpui.h"
#include "gimppickbutton.h"
#include "gimpstock.h"
#include "cursors/gimp-color-picker-cursors.h"
#include "libgimp/libgimp-intl.h"
#ifdef GDK_WINDOWING_QUARTZ
#include <ApplicationServices/ApplicationServices.h>
#endif
/**
* SECTION: gimppickbutton
* @title: GimpPickButton
* @short_description: Widget to pick a color from screen.
*
* #GimpPickButton is a specialized button. When clicked, it changes
* the cursor to a color-picker pipette and allows the user to pick a
* color from any point on the screen.
**/
enum
{
COLOR_PICKED,
LAST_SIGNAL
};
static void gimp_pick_button_dispose (GObject *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)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
/**
* GimpPickButton::color-picked:
* @gimppickbutton: the object which received the signal.
* @arg1: pointer to a #GimpRGB structure that holds the picked color
*
* This signal is emitted when the user has picked a color.
**/
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->dispose = gimp_pick_button_dispose;
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_dispose (GObject *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;
}
G_OBJECT_CLASS (parent_class)->dispose (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 */
static GdkCursor *
make_cursor (GdkDisplay *display)
{
GdkCursor *cursor;
GdkPixbuf *pixbuf;
pixbuf = gdk_pixbuf_new_from_inline (-1, cursor_color_picker, FALSE, NULL);
cursor = gdk_cursor_new_from_pixbuf (display, pixbuf, 1, 30);
g_object_unref (pixbuf);
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 (gtk_widget_get_display (GTK_WIDGET (gtk_button)));
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_KEY_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)
{
#ifndef GDK_WINDOWING_QUARTZ
GdkWindow *root_window = gdk_screen_get_root_window (screen);
cairo_surface_t *image;
cairo_t *cr;
guchar *data;
guchar color[3];
GimpRGB rgb;
image = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1);
cr = cairo_create (image);
gdk_cairo_set_source_window (cr, root_window, -x_root, -y_root);
cairo_paint (cr);
cairo_destroy (cr);
data = cairo_image_surface_get_data (image);
GIMP_CAIRO_RGB24_GET_PIXEL (data, color[0], color[1], color[2]);
cairo_surface_destroy (image);
gimp_rgba_set_uchar (&rgb, color[0], color[1], color[2], 255);
#else /* GDK_WINDOWING_QUARTZ */
CGImageRef root_image_ref;
CFDataRef pixel_data;
const guchar *data;
GimpRGB rgb;
CGRect rect = CGRectMake (x_root, y_root, 1, 1);
root_image_ref = CGWindowListCreateImage (rect,
kCGWindowListOptionOnScreenOnly,
kCGNullWindowID,
kCGWindowImageDefault);
pixel_data = CGDataProviderCopyData(CGImageGetDataProvider(root_image_ref));
data = CFDataGetBytePtr(pixel_data);
gimp_rgba_set_uchar (&rgb, data[2], data[1], data[0], 255);
CGImageRelease (root_image_ref);
CFRelease (pixel_data);
#endif /* GDK_WINDOWING_QUARTZ */
g_signal_emit (button, pick_button_signals[COLOR_PICKED], 0, &rgb);
}
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