git.sur5r.net Git - glabels/blob - glabels2/src/color-swatch.c

   1 /*
   2  *  color-swatch.c
   3  *  Copyright (C) 2009  Jim Evins <evins@snaught.com>.
   4  *
   5  *  This file is part of gLabels.
   6  *
   7  *  gLabels is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation, either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  gLabels is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with gLabels.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22
  23 #include "color-swatch.h"
  24
  25 #include "marshal.h"
  26 #include "color.h"
  27
  28
  29 /*===========================================*/
  30 /* Private macros and constants.             */
  31 /*===========================================*/
  32
  33
  34 /*===========================================*/
  35 /* Private types                             */
  36 /*===========================================*/
  37
  38 struct _glColorSwatchPrivate {
  39
  40         guint      color;
  41
  42 };
  43
  44
  45 /*===========================================*/
  46 /* Private globals                           */
  47 /*===========================================*/
  48
  49
  50 /*===========================================*/
  51 /* Local function prototypes                 */
  52 /*===========================================*/
  53
  54 static void       gl_color_swatch_finalize    (GObject        *object);
  55
  56 static void       style_set_cb                (GtkWidget      *widget,
  57                                                GtkStyle       *previous_style);
  58
  59 static void       redraw                      (glColorSwatch  *this);
  60
  61 static gboolean   expose_event_cb             (GtkWidget      *widget,
  62                                                GdkEventExpose *event);
  63
  64 static void       draw_swatch                 (glColorSwatch  *this,
  65                                                cairo_t        *cr);
  66
  67
  68
  69 /****************************************************************************/
  70 /* Boilerplate Object stuff.                                                */
  71 /****************************************************************************/
  72 G_DEFINE_TYPE (glColorSwatch, gl_color_swatch, GTK_TYPE_DRAWING_AREA);
  73
  74
  75 /*****************************************************************************/
  76 /* Class Init Function.                                                      */
  77 /*****************************************************************************/
  78 static void
  79 gl_color_swatch_class_init (glColorSwatchClass *class)
  80 {
  81         GObjectClass   *gobject_class = G_OBJECT_CLASS (class);
  82         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  83
  84         gl_color_swatch_parent_class = g_type_class_peek_parent (class);
  85
  86         gobject_class->finalize    = gl_color_swatch_finalize;
  87
  88         widget_class->expose_event = expose_event_cb;
  89         widget_class->style_set    = style_set_cb;
  90 }
  91
  92
  93 /*****************************************************************************/
  94 /* Object Instance Init Function.                                            */
  95 /*****************************************************************************/
  96 static void
  97 gl_color_swatch_init (glColorSwatch *this)
  98 {
  99         GTK_WIDGET_SET_FLAGS (GTK_WIDGET (this), GTK_NO_WINDOW);
 100
 101         this->priv = g_new0 (glColorSwatchPrivate, 1);
 102 }
 103
 104
 105 /*****************************************************************************/
 106 /* Finalize Method.                                                          */
 107 /*****************************************************************************/
 108 static void
 109 gl_color_swatch_finalize (GObject *object)
 110 {
 111         glColorSwatch *this = GL_COLOR_SWATCH (object);
 112
 113         g_return_if_fail (object != NULL);
 114         g_return_if_fail (GL_IS_COLOR_SWATCH (object));
 115
 116         g_free (this->priv);
 117
 118         G_OBJECT_CLASS (gl_color_swatch_parent_class)->finalize (object);
 119 }
 120
 121
 122 /*****************************************************************************/
 123 /** New Object Generator.                                                    */
 124 /*****************************************************************************/
 125 GtkWidget *
 126 gl_color_swatch_new (gint         w,
 127                      gint         h,
 128                      guint        color)
 129 {
 130         glColorSwatch *this;
 131
 132         this = g_object_new (GL_TYPE_COLOR_SWATCH, NULL);
 133
 134         this->priv->color = color;
 135
 136         gtk_widget_set_size_request (GTK_WIDGET (this), w, h);
 137
 138         return GTK_WIDGET (this);
 139 }
 140
 141
 142 /*****************************************************************************/
 143 /* Set color.                                                                */
 144 /*****************************************************************************/
 145 void
 146 gl_color_swatch_set_color (glColorSwatch *this,
 147                            guint          color)
 148 {
 149         this->priv->color = color;
 150
 151         redraw (this);
 152 }
 153
 154
 155 /*--------------------------------------------------------------------------*/
 156 /* Style set handler (updates colors when style/theme changes).             */
 157 /*--------------------------------------------------------------------------*/
 158 static void
 159 style_set_cb (GtkWidget        *widget,
 160               GtkStyle         *previous_style)
 161 {
 162         redraw (GL_COLOR_SWATCH (widget));
 163 }
 164
 165
 166 /*****************************************************************************/
 167 /* Request redraw.                                                           */
 168 /*****************************************************************************/
 169 static void
 170 redraw (glColorSwatch  *this)
 171 {
 172         GdkRegion *region;
 173
 174         if (GTK_WIDGET_REALIZED (GTK_WIDGET (this)))
 175         {
 176                 /* redraw the cairo canvas forcing an expose event */
 177                 region = gdk_drawable_get_clip_region (GTK_WIDGET (this)->window);
 178                 gdk_window_invalidate_region (GTK_WIDGET (this)->window, region, TRUE);
 179                 gdk_region_destroy (region);
 180         }
 181 }
 182
 183
 184 /*****************************************************************************/
 185 /* "Expose event" callback.                                                  */
 186 /*****************************************************************************/
 187 static gboolean
 188 expose_event_cb (GtkWidget      *widget,
 189                  GdkEventExpose *event)
 190 {
 191         cairo_t *cr;
 192
 193         cr = gdk_cairo_create (widget->window);
 194
 195         cairo_rectangle (cr,
 196                         event->area.x, event->area.y,
 197                         event->area.width, event->area.height);
 198         cairo_clip (cr);
 199
 200         cairo_translate (cr, widget->allocation.x, widget->allocation.y);
 201
 202         draw_swatch (GL_COLOR_SWATCH (widget), cr);
 203
 204         cairo_destroy (cr);
 205
 206         return FALSE;
 207 }
 208
 209
 210 /*****************************************************************************/
 211 /* Draw swatch.                                                              */
 212 /*****************************************************************************/
 213 static void
 214 draw_swatch (glColorSwatch *this,
 215              cairo_t       *cr)
 216 {
 217         GtkStyle  *style;
 218         gdouble    w, h;
 219         guint      fill_color, line_color;
 220
 221
 222         cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
 223
 224
 225         w = GTK_WIDGET (this)->allocation.width;
 226         h = GTK_WIDGET (this)->allocation.height;
 227
 228
 229         style = gtk_widget_get_style (GTK_WIDGET (this));
 230         if ( GTK_WIDGET_IS_SENSITIVE (GTK_WIDGET (this)) )
 231         {
 232                 fill_color = this->priv->color;
 233                 line_color = gl_color_from_gdk_color (&style->fg[GTK_STATE_NORMAL]);
 234         }
 235         else
 236         {
 237                 fill_color = GL_COLOR_NONE;
 238                 line_color = gl_color_from_gdk_color (&style->fg[GTK_STATE_INSENSITIVE]);
 239         }
 240
 241         cairo_rectangle( cr, 0, 0, w-1, h-1 );
 242
 243         cairo_set_source_rgba (cr, GL_COLOR_RGBA_ARGS (fill_color));
 244         cairo_fill_preserve( cr );
 245
 246         cairo_set_source_rgb (cr, GL_COLOR_RGB_ARGS (line_color));
 247         cairo_set_line_width (cr, 1.0);
 248         cairo_stroke (cr);
 249 }
 250
 251
 252
 253 /*
 254  * Local Variables:       -- emacs
 255  * mode: C                -- emacs
 256  * c-basic-offset: 8      -- emacs
 257  * tab-width: 8           -- emacs
 258  * indent-tabs-mode: nil  -- emacs
 259  * End:                   -- emacs
 260  */