1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 2012 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
23 #include "gtkcolorplane.h"
25 struct _GtkColorPlanePrivate
27 cairo_surface_t *surface;
39 guint signals[LAST_SIGNAL];
41 G_DEFINE_TYPE (GtkColorPlane, gtk_color_plane, GTK_TYPE_DRAWING_AREA)
44 sv_draw (GtkWidget *widget,
47 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
51 cairo_set_source_surface (cr, plane->priv->surface, 0, 0);
56 width = gtk_widget_get_allocated_width (widget);
57 height = gtk_widget_get_allocated_height (widget);
59 cairo_move_to (cr, 0, y + 0.5);
60 cairo_line_to (cr, width, y + 0.5);
62 cairo_move_to (cr, x + 0.5, 0);
63 cairo_line_to (cr, x + 0.5, height);
65 if (gtk_widget_has_visible_focus (widget))
67 cairo_set_line_width (cr, 3.0);
68 cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
69 cairo_stroke_preserve (cr);
71 cairo_set_line_width (cr, 1.0);
72 cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
77 cairo_set_line_width (cr, 1.0);
78 cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.8);
86 create_sv_surface (GtkColorPlane *plane)
88 GtkWidget *widget = GTK_WIDGET (plane);
90 cairo_surface_t *surface;
91 gint width, height, stride;
93 guint red, green, blue;
100 if (!gtk_widget_get_realized (widget))
103 width = gtk_widget_get_allocated_width (widget);
104 height = gtk_widget_get_allocated_height (widget);
106 surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
110 if (plane->priv->surface)
111 cairo_surface_destroy (plane->priv->surface);
112 plane->priv->surface = surface;
114 if (width == 1 || height == 1)
117 stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
119 data = g_malloc (height * stride);
122 sf = 1.0 / (height - 1);
123 vf = 1.0 / (width - 1);
124 for (y = 0; y < height; y++)
126 s = CLAMP (1.0 - y * sf, 0.0, 1.0);
127 p = data + y * (stride / 4);
128 for (x = 0; x < width; x++)
131 gtk_hsv_to_rgb (h, s, v, &r, &g, &b);
132 red = CLAMP (r * 255, 0, 255);
133 green = CLAMP (g * 255, 0, 255);
134 blue = CLAMP (b * 255, 0, 255);
135 p[x] = (red << 16) | (green << 8) | blue;
139 tmp = cairo_image_surface_create_for_data ((guchar *)data, CAIRO_FORMAT_RGB24,
140 width, height, stride);
141 cr = cairo_create (surface);
143 cairo_set_source_surface (cr, tmp, 0, 0);
147 cairo_surface_destroy (tmp);
152 hsv_to_xy (GtkColorPlane *plane)
156 width = gtk_widget_get_allocated_width (GTK_WIDGET (plane));
157 height = gtk_widget_get_allocated_height (GTK_WIDGET (plane));
159 plane->priv->x = CLAMP (width * plane->priv->v, 0, width - 1);
160 plane->priv->y = CLAMP (height * (1 - plane->priv->s), 0, height - 1);
164 sv_configure (GtkWidget *widget,
165 GdkEventConfigure *event)
167 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
169 create_sv_surface (plane);
175 set_cross_grab (GtkWidget *widget,
181 cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (widget)),
183 gdk_device_grab (device,
184 gtk_widget_get_window (widget),
187 GDK_POINTER_MOTION_MASK
188 | GDK_POINTER_MOTION_HINT_MASK
189 | GDK_BUTTON_RELEASE_MASK,
192 g_object_unref (cursor);
196 sv_grab_broken (GtkWidget *widget,
197 GdkEventGrabBroken *event)
199 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
201 plane->priv->in_drag = FALSE;
207 sv_update_color (GtkColorPlane *plane,
211 GtkWidget *widget = GTK_WIDGET (plane);
216 plane->priv->s = CLAMP (1 - y * (1.0 / gtk_widget_get_allocated_height (widget)), 0, 1);
217 plane->priv->v = CLAMP (x * (1.0 / gtk_widget_get_allocated_width (widget)), 0, 1);
218 g_signal_emit (plane, signals[CHANGED], 0);
219 gtk_widget_queue_draw (widget);
223 sv_button_press (GtkWidget *widget,
224 GdkEventButton *event)
226 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
228 if (plane->priv->in_drag || event->button != GDK_BUTTON_PRIMARY)
231 plane->priv->in_drag = TRUE;
232 set_cross_grab (widget, gdk_event_get_device ((GdkEvent*)event), event->time);
233 sv_update_color (plane, event->x, event->y);
234 gtk_widget_grab_focus (widget);
240 sv_button_release (GtkWidget *widget,
241 GdkEventButton *event)
243 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
245 if (!plane->priv->in_drag || event->button != GDK_BUTTON_PRIMARY)
248 plane->priv->in_drag = FALSE;
250 sv_update_color (plane, event->x, event->y);
251 gdk_device_ungrab (gdk_event_get_device ((GdkEvent *) event), event->time);
257 sv_motion (GtkWidget *widget,
258 GdkEventMotion *event)
260 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
262 if (!plane->priv->in_drag)
265 gdk_event_request_motions (event);
266 sv_update_color (plane, event->x, event->y);
272 sv_move (GtkColorPlane *plane,
276 if (plane->priv->s + ds > 1)
278 if (plane->priv->s < 1)
283 else if (plane->priv->s + ds < 0)
285 if (plane->priv->s > 0)
292 plane->priv->s += ds;
295 if (plane->priv->v + dv > 1)
297 if (plane->priv->v < 1)
302 else if (plane->priv->v + dv < 0)
304 if (plane->priv->v > 0)
311 plane->priv->v += dv;
315 g_signal_emit (plane, signals[CHANGED], 0);
317 gtk_widget_queue_draw (GTK_WIDGET (plane));
321 gtk_widget_error_bell (GTK_WIDGET (plane));
325 sv_key_press (GtkWidget *widget,
328 GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
331 /* FIXME: turn into bindings */
332 if ((event->state & GDK_MOD1_MASK) != 0)
337 if (event->keyval == GDK_KEY_Up ||
338 event->keyval == GDK_KEY_KP_Up)
339 sv_move (plane, step, 0);
340 else if (event->keyval == GDK_KEY_Down ||
341 event->keyval == GDK_KEY_KP_Down)
342 sv_move (plane, -step, 0);
343 else if (event->keyval == GDK_KEY_Left ||
344 event->keyval == GDK_KEY_KP_Left)
345 sv_move (plane, 0, -step);
346 else if (event->keyval == GDK_KEY_Right ||
347 event->keyval == GDK_KEY_KP_Right)
348 sv_move (plane, 0, step);
356 gtk_color_plane_init (GtkColorPlane *plane)
358 plane->priv = G_TYPE_INSTANCE_GET_PRIVATE (plane,
359 GTK_TYPE_COLOR_PLANE,
360 GtkColorPlanePrivate);
361 gtk_widget_set_can_focus (GTK_WIDGET (plane), TRUE);
362 gtk_widget_set_events (GTK_WIDGET (plane), GDK_KEY_PRESS_MASK
363 | GDK_BUTTON_PRESS_MASK
364 | GDK_BUTTON_RELEASE_MASK
365 | GDK_POINTER_MOTION_MASK);
369 sv_finalize (GObject *object)
371 GtkColorPlane *plane = GTK_COLOR_PLANE (object);
373 cairo_surface_destroy (plane->priv->surface);
375 G_OBJECT_CLASS (gtk_color_plane_parent_class)->finalize (object);
379 gtk_color_plane_class_init (GtkColorPlaneClass *class)
381 GObjectClass *object_class = G_OBJECT_CLASS (class);
382 GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
384 object_class->finalize = sv_finalize;
386 widget_class->draw = sv_draw;
387 widget_class->configure_event = sv_configure;
388 widget_class->button_press_event = sv_button_press;
389 widget_class->button_release_event = sv_button_release;
390 widget_class->motion_notify_event = sv_motion;
391 widget_class->grab_broken_event = sv_grab_broken;
392 widget_class->key_press_event = sv_key_press;
395 g_signal_new ("changed",
396 GTK_TYPE_COLOR_PLANE,
398 G_STRUCT_OFFSET (GtkColorPlaneClass, changed),
403 g_type_class_add_private (class, sizeof (GtkColorPlanePrivate));
407 gtk_color_plane_get_h (GtkColorPlane *plane)
409 return plane->priv->h;
413 gtk_color_plane_get_s (GtkColorPlane *plane)
415 return plane->priv->s;
419 gtk_color_plane_get_v (GtkColorPlane *plane)
421 return plane->priv->v;
425 gtk_color_plane_set_h (GtkColorPlane *plane,
429 create_sv_surface (plane);
430 gtk_widget_queue_draw (GTK_WIDGET (plane));
434 gtk_color_plane_set_s (GtkColorPlane *plane,
439 gtk_widget_queue_draw (GTK_WIDGET (plane));
443 gtk_color_plane_set_v (GtkColorPlane *plane,
448 gtk_widget_queue_draw (GTK_WIDGET (plane));
452 gtk_color_plane_new (void)
454 return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_PLANE, NULL);