src/empathy-rounded-rectangle.c

   1 /*
   2  * empathy-rounded-rectangle.c - Source for EmpathyRoundedRectangle
   3  * Copyright (C) 2011 Collabora Ltd.
   4  * @author Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <math.h>
  24
  25 #include <clutter/clutter.h>
  26
  27 #include "empathy-rounded-rectangle.h"
  28
  29 G_DEFINE_TYPE (EmpathyRoundedRectangle,
  30     empathy_rounded_rectangle,
  31     CLUTTER_TYPE_CAIRO_TEXTURE)
  32
  33 struct _EmpathyRoundedRectanglePriv
  34 {
  35   guint width, height;
  36   ClutterColor border_color;
  37   guint border_width;
  38   guint round_factor;
  39 };
  40
  41 static gboolean
  42 draw_cb (ClutterCairoTexture *canvas,
  43     cairo_t *cr)
  44 {
  45   EmpathyRoundedRectangle *self = EMPATHY_ROUNDED_RECTANGLE (canvas);
  46   guint width, height;
  47   guint border_width;
  48   guint tmp_alpha;
  49   gdouble radius;
  50
  51   width = self->priv->width;
  52   height = self->priv->height;
  53   radius = self->priv->height / self->priv->round_factor;
  54   border_width = self->priv->border_width;
  55
  56   /* compute the composited opacity of the actor taking into
  57    * account the opacity of the color set by the user */
  58   tmp_alpha = clutter_actor_get_paint_opacity (CLUTTER_ACTOR (self))
  59             * self->priv->border_color.alpha
  60             / 255;
  61
  62   cairo_set_source_rgba (cr,
  63       self->priv->border_color.red,
  64       self->priv->border_color.green,
  65       self->priv->border_color.blue,
  66       tmp_alpha);
  67
  68   cairo_set_line_width (cr, border_width);
  69
  70   cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
  71   cairo_paint (cr);
  72   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
  73
  74   /* make room for the portion of the border drawn on the outside */
  75   cairo_translate (cr, border_width/2.0, border_width/2.0);
  76
  77   cairo_new_sub_path (cr);
  78   cairo_arc (cr, width - radius, radius, radius,
  79       -M_PI/2.0, 0);
  80   cairo_arc (cr, width - radius, height - radius, radius,
  81       0, M_PI/2.0);
  82   cairo_arc (cr, radius, height - radius, radius,
  83       M_PI/2.0, M_PI);
  84   cairo_arc (cr, radius, radius, radius,
  85       M_PI, -M_PI/2.0);
  86   cairo_close_path (cr);
  87
  88   cairo_stroke (cr);
  89
  90   return TRUE;
  91 }
  92
  93 static void
  94 empathy_rounded_rectangle_init (EmpathyRoundedRectangle *self)
  95 {
  96   self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
  97       EMPATHY_TYPE_ROUNDED_RECTANGLE, EmpathyRoundedRectanglePriv);
  98
  99   self->priv->border_width = 1;
 100   self->priv->round_factor = 2;
 101 }
 102
 103 static void
 104 empathy_rounded_rectangle_finalize (GObject *object)
 105 {
 106   G_OBJECT_CLASS (empathy_rounded_rectangle_parent_class)->finalize (object);
 107 }
 108
 109 static void
 110 empathy_rounded_rectangle_class_init (EmpathyRoundedRectangleClass *klass)
 111 {
 112   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 113
 114   gobject_class->finalize = empathy_rounded_rectangle_finalize;
 115
 116   g_type_class_add_private (klass, sizeof (EmpathyRoundedRectanglePriv));
 117 }
 118
 119 static void
 120 empathy_rounded_rectangle_update_surface_size (EmpathyRoundedRectangle *self)
 121 {
 122   clutter_cairo_texture_set_surface_size (CLUTTER_CAIRO_TEXTURE (self),
 123       self->priv->width + self->priv->border_width,
 124       self->priv->height + self->priv->border_width);
 125 }
 126
 127 EmpathyRoundedRectangle *
 128 empathy_rounded_rectangle_new (guint width,
 129     guint height,
 130     guint round_factor)
 131 {
 132   EmpathyRoundedRectangle *self;
 133
 134   self = EMPATHY_ROUNDED_RECTANGLE (g_object_new (EMPATHY_TYPE_ROUNDED_RECTANGLE, NULL));
 135
 136   self->priv->width = width;
 137   self->priv->height = height;
 138   self->priv->round_factor = round_factor;
 139
 140   g_signal_connect (self, "draw", G_CALLBACK (draw_cb), NULL);
 141
 142   empathy_rounded_rectangle_update_surface_size (self);
 143   clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (self));
 144
 145   return self;
 146 }
 147
 148 void
 149 empathy_rounded_rectangle_set_border_width (EmpathyRoundedRectangle *self,
 150     guint border_width)
 151 {
 152   self->priv->border_width = border_width;
 153
 154   empathy_rounded_rectangle_update_surface_size (self);
 155   clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (self));
 156 }
 157
 158 void
 159 empathy_rounded_rectangle_set_border_color (EmpathyRoundedRectangle *self,
 160     const ClutterColor *color)
 161 {
 162   self->priv->border_color = *color;
 163
 164   clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (self));
 165 }