Pileus Git - ~andy/gtk/blob - gtk/gtkcolorscale.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2012 Red Hat, Inc.
   3  *
   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.
   8  *
   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.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include "gtkcolorscaleprivate.h"
  21
  22 #include "gtkcolorchooserprivate.h"
  23 #include "gtkcolorutils.h"
  24 #include "gtkorientable.h"
  25 #include "gtkstylecontext.h"
  26 #include "gtkaccessible.h"
  27 #include "gtkpressandholdprivate.h"
  28 #include "gtkprivate.h"
  29 #include "gtkintl.h"
  30
  31 #include <math.h>
  32
  33 struct _GtkColorScalePrivate
  34 {
  35   cairo_surface_t *surface;
  36   gint width, height;
  37   GdkRGBA color;
  38   GtkColorScaleType type;
  39
  40   GtkPressAndHold *press_and_hold;
  41 };
  42
  43 enum
  44 {
  45   PROP_ZERO,
  46   PROP_SCALE_TYPE
  47 };
  48
  49 G_DEFINE_TYPE (GtkColorScale, gtk_color_scale, GTK_TYPE_SCALE)
  50
  51 static void
  52 gtk_color_scale_get_trough_size (GtkColorScale *scale,
  53                                  gint *x_offset_out,
  54                                  gint *y_offset_out,
  55                                  gint *width_out,
  56                                  gint *height_out)
  57 {
  58   GtkWidget *widget = GTK_WIDGET (scale);
  59   gint width, height, focus_line_width, focus_padding;
  60   gint x_offset, y_offset;
  61   gint slider_width, slider_height;
  62
  63   gtk_widget_style_get (widget,
  64                         "focus-line-width", &focus_line_width,
  65                         "focus-padding", &focus_padding,
  66                         "slider-width", &slider_width,
  67                         "slider-length", &slider_height,
  68                         NULL);
  69
  70   width = gtk_widget_get_allocated_width (widget) - 2 * (focus_line_width + focus_padding);
  71   height = gtk_widget_get_allocated_height (widget) - 2 * (focus_line_width + focus_padding);
  72
  73   x_offset = focus_line_width + focus_padding;
  74   y_offset = focus_line_width + focus_padding;
  75
  76   /* if the slider has a vertical shape, draw the trough asymmetric */
  77   if (slider_width > slider_height)
  78     {
  79       if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_VERTICAL)
  80         {
  81           if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
  82             x_offset += (gint) floor (slider_width / 2.0);
  83
  84           width = (gint) floor (slider_width / 2.0);
  85         }
  86       else
  87         {
  88           height = (gint) floor (slider_width / 2.0);
  89         }
  90     }
  91
  92   if (width_out)
  93     *width_out = width;
  94   if (height_out)
  95     *height_out = height;
  96   if (x_offset_out)
  97     *x_offset_out = x_offset;
  98   if (y_offset_out)
  99     *y_offset_out = y_offset;
 100 }
 101
 102 static void
 103 create_surface (GtkColorScale *scale)
 104 {
 105   GtkWidget *widget = GTK_WIDGET (scale);
 106   cairo_surface_t *surface;
 107   gint width, height;
 108
 109   if (!gtk_widget_get_realized (widget))
 110     return;
 111
 112   gtk_color_scale_get_trough_size (scale,
 113                                    NULL, NULL,
 114                                    &width, &height);
 115
 116   if (!scale->priv->surface ||
 117       width != scale->priv->width ||
 118       height != scale->priv->height)
 119     {
 120       surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
 121                                                    CAIRO_CONTENT_COLOR,
 122                                                    width, height);
 123       if (scale->priv->surface)
 124         cairo_surface_destroy (scale->priv->surface);
 125       scale->priv->surface = surface;
 126       scale->priv->width = width;
 127       scale->priv->height= height;
 128     }
 129   else
 130     surface = scale->priv->surface;
 131
 132   if (width == 1 || height == 1)
 133     return;
 134
 135   if (scale->priv->type == GTK_COLOR_SCALE_HUE)
 136     {
 137       cairo_t *cr;
 138       gint stride;
 139       cairo_surface_t *tmp;
 140       guint red, green, blue;
 141       guint32 *data, *p;
 142       gdouble h;
 143       gdouble r, g, b;
 144       gdouble f;
 145       gint x, y;
 146
 147       stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
 148
 149       data = g_malloc (height * stride);
 150
 151       f = 1.0 / (height - 1);
 152       for (y = 0; y < height; y++)
 153         {
 154           h = CLAMP (y * f, 0.0, 1.0);
 155           p = data + y * (stride / 4);
 156           for (x = 0; x < width; x++)
 157             {
 158               gtk_hsv_to_rgb (h, 1, 1, &r, &g, &b);
 159               red = CLAMP (r * 255, 0, 255);
 160               green = CLAMP (g * 255, 0, 255);
 161               blue = CLAMP (b * 255, 0, 255);
 162               p[x] = (red << 16) | (green << 8) | blue;
 163             }
 164         }
 165
 166       tmp = cairo_image_surface_create_for_data ((guchar *)data, CAIRO_FORMAT_RGB24,
 167                                                  width, height, stride);
 168       cr = cairo_create (surface);
 169
 170       cairo_set_source_surface (cr, tmp, 0, 0);
 171       cairo_paint (cr);
 172
 173       cairo_destroy (cr);
 174       cairo_surface_destroy (tmp);
 175       g_free (data);
 176     }
 177   else if (scale->priv->type == GTK_COLOR_SCALE_ALPHA)
 178     {
 179       cairo_t *cr;
 180       cairo_pattern_t *pattern;
 181       cairo_matrix_t matrix;
 182       GdkRGBA *color;
 183
 184       cr = cairo_create (surface);
 185
 186       cairo_set_source_rgb (cr, 0.33, 0.33, 0.33);
 187       cairo_paint (cr);
 188       cairo_set_source_rgb (cr, 0.66, 0.66, 0.66);
 189
 190       pattern = _gtk_color_chooser_get_checkered_pattern ();
 191       cairo_matrix_init_scale (&matrix, 0.125, 0.125);
 192       cairo_pattern_set_matrix (pattern, &matrix);
 193       cairo_mask (cr, pattern);
 194       cairo_pattern_destroy (pattern);
 195
 196       color = &scale->priv->color;
 197
 198       pattern = cairo_pattern_create_linear (0, 0, width, 0);
 199       cairo_pattern_add_color_stop_rgba (pattern, 0, color->red, color->green, color->blue, 0);
 200       cairo_pattern_add_color_stop_rgba (pattern, width, color->red, color->green, color->blue, 1);
 201       cairo_set_source (cr, pattern);
 202       cairo_paint (cr);
 203       cairo_pattern_destroy (pattern);
 204
 205       cairo_destroy (cr);
 206     }
 207 }
 208
 209 static gboolean
 210 scale_draw (GtkWidget *widget,
 211             cairo_t   *cr)
 212 {
 213   GtkColorScale *scale = GTK_COLOR_SCALE (widget);
 214   gint width, height, x_offset, y_offset;
 215   cairo_pattern_t *pattern;
 216
 217   create_surface (scale);
 218   gtk_color_scale_get_trough_size (scale,
 219                                    &x_offset, &y_offset,
 220                                    &width, &height);
 221
 222   cairo_save (cr);
 223   cairo_translate (cr, x_offset, y_offset);
 224   cairo_rectangle (cr, 0, 0, width, height);
 225
 226   pattern = cairo_pattern_create_for_surface (scale->priv->surface);
 227   if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL &&
 228       gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
 229     {
 230       cairo_matrix_t matrix;
 231
 232       cairo_matrix_init_scale (&matrix, -1, 1);
 233       cairo_matrix_translate (&matrix, -width, 0);
 234       cairo_pattern_set_matrix (pattern, &matrix);
 235     }
 236   cairo_set_source (cr, pattern);
 237   cairo_fill (cr);
 238
 239   cairo_pattern_destroy (pattern);
 240
 241   cairo_restore (cr);
 242
 243   GTK_WIDGET_CLASS (gtk_color_scale_parent_class)->draw (widget, cr);
 244
 245   return FALSE;
 246 }
 247
 248 static void
 249 gtk_color_scale_init (GtkColorScale *scale)
 250 {
 251   scale->priv = G_TYPE_INSTANCE_GET_PRIVATE (scale,
 252                                              GTK_TYPE_COLOR_SCALE,
 253                                              GtkColorScalePrivate);
 254   gtk_widget_add_events (GTK_WIDGET (scale), GDK_TOUCH_MASK);
 255 }
 256
 257 static void
 258 scale_finalize (GObject *object)
 259 {
 260   GtkColorScale *scale = GTK_COLOR_SCALE (object);
 261
 262   if (scale->priv->surface)
 263     cairo_surface_destroy (scale->priv->surface);
 264
 265   g_clear_object (&scale->priv->press_and_hold);
 266
 267   G_OBJECT_CLASS (gtk_color_scale_parent_class)->finalize (object);
 268 }
 269
 270 static void
 271 scale_get_property (GObject    *object,
 272                     guint       prop_id,
 273                     GValue     *value,
 274                     GParamSpec *pspec)
 275 {
 276   GtkColorScale *scale = GTK_COLOR_SCALE (object);
 277
 278   switch (prop_id)
 279     {
 280     case PROP_SCALE_TYPE:
 281       g_value_set_int (value, scale->priv->type);
 282       break;
 283     default:
 284       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 285       break;
 286     }
 287 }
 288
 289 static void
 290 scale_set_type (GtkColorScale     *scale,
 291                 GtkColorScaleType  type)
 292 {
 293   AtkObject *atk_obj;
 294
 295   scale->priv->type = type;
 296
 297   atk_obj = gtk_widget_get_accessible (GTK_WIDGET (scale));
 298   if (GTK_IS_ACCESSIBLE (atk_obj))
 299     {
 300       if (type == GTK_COLOR_SCALE_HUE)
 301         atk_object_set_name (atk_obj, C_("Color channel", "Hue"));
 302       else if (type == GTK_COLOR_SCALE_ALPHA)
 303         atk_object_set_name (atk_obj, C_("Color channel", "Alpha"));
 304       atk_object_set_role (gtk_widget_get_accessible (GTK_WIDGET (scale)), ATK_ROLE_COLOR_CHOOSER);
 305     }
 306 }
 307
 308 static void
 309 scale_set_property (GObject      *object,
 310                     guint         prop_id,
 311                     const GValue *value,
 312                     GParamSpec   *pspec)
 313 {
 314   GtkColorScale *scale = GTK_COLOR_SCALE (object);
 315
 316   switch (prop_id)
 317     {
 318     case PROP_SCALE_TYPE:
 319       scale_set_type (scale, (GtkColorScaleType)g_value_get_int (value));
 320       break;
 321     default:
 322       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 323       break;
 324     }
 325 }
 326
 327 static void
 328 hold_action (GtkPressAndHold *pah,
 329              gint             x,
 330              gint             y,
 331              GtkColorScale   *scale)
 332 {
 333   gboolean handled;
 334
 335   g_signal_emit_by_name (scale, "popup-menu", &handled);
 336 }
 337
 338 static gboolean
 339 scale_touch (GtkWidget     *widget,
 340              GdkEventTouch *event)
 341 {
 342   GtkColorScale *scale = GTK_COLOR_SCALE (widget);
 343
 344   if (!scale->priv->press_and_hold)
 345     {
 346       gint drag_threshold;
 347
 348       g_object_get (gtk_widget_get_settings (widget),
 349                     "gtk-dnd-drag-threshold", &drag_threshold,
 350                     NULL);
 351
 352       scale->priv->press_and_hold = gtk_press_and_hold_new ();
 353
 354       g_object_set (scale->priv->press_and_hold,
 355                     "drag-threshold", drag_threshold,
 356                     "hold-time", 1000,
 357                     NULL);
 358
 359       g_signal_connect (scale->priv->press_and_hold, "hold",
 360                         G_CALLBACK (hold_action), scale);
 361     }
 362
 363   gtk_press_and_hold_process_event (scale->priv->press_and_hold, (GdkEvent *)event);
 364
 365   return GTK_WIDGET_CLASS (gtk_color_scale_parent_class)->touch_event (widget, event);
 366 }
 367
 368
 369 static void
 370 gtk_color_scale_class_init (GtkColorScaleClass *class)
 371 {
 372   GObjectClass *object_class = G_OBJECT_CLASS (class);
 373   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 374
 375   object_class->finalize = scale_finalize;
 376   object_class->get_property = scale_get_property;
 377   object_class->set_property = scale_set_property;
 378
 379   widget_class->draw = scale_draw;
 380   widget_class->touch_event = scale_touch;
 381
 382   g_object_class_install_property (object_class, PROP_SCALE_TYPE,
 383       g_param_spec_int ("scale-type", P_("Scale type"), P_("Scale type"),
 384                         0, 1, 0,
 385                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 386
 387   g_type_class_add_private (class, sizeof (GtkColorScalePrivate));
 388 }
 389
 390 void
 391 gtk_color_scale_set_rgba (GtkColorScale *scale,
 392                           const GdkRGBA *color)
 393 {
 394   scale->priv->color = *color;
 395   scale->priv->width = -1; /* force surface refresh */
 396   create_surface (scale);
 397   gtk_widget_queue_draw (GTK_WIDGET (scale));
 398 }
 399
 400 GtkWidget *
 401 gtk_color_scale_new (GtkAdjustment     *adjustment,
 402                      GtkColorScaleType  type)
 403 {
 404   return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_SCALE,
 405                                      "adjustment", adjustment,
 406                                      "draw-value", FALSE,
 407                                      "scale-type", type,
 408                                      NULL);
 409 }