git.sur5r.net Git - glabels/blob - src/font-sample.c

   1 /*
   2  *  font-sample.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 "font-sample.h"
  24
  25 #include "marshal.h"
  26 #include "color.h"
  27
  28
  29 /*===========================================*/
  30 /* Private macros and constants.             */
  31 /*===========================================*/
  32
  33 #define MARGIN 2
  34
  35
  36 /*===========================================*/
  37 /* Private types                             */
  38 /*===========================================*/
  39
  40 struct _glFontSamplePrivate {
  41
  42         gchar *sample_text;
  43
  44         gchar *font_family;
  45 };
  46
  47
  48 /*===========================================*/
  49 /* Private globals                           */
  50 /*===========================================*/
  51
  52
  53 /*===========================================*/
  54 /* Local function prototypes                 */
  55 /*===========================================*/
  56
  57 static void       gl_font_sample_finalize     (GObject        *object);
  58
  59 static void       style_set_cb                (GtkWidget      *widget,
  60                                                GtkStyle       *previous_style);
  61
  62 static void       redraw                      (glFontSample   *this);
  63
  64 static gboolean   draw_cb                     (GtkWidget      *widget,
  65                                                cairo_t        *cr);
  66
  67 static void       draw_sample                 (glFontSample   *this,
  68                                                cairo_t        *cr);
  69
  70
  71
  72 /****************************************************************************/
  73 /* Boilerplate Object stuff.                                                */
  74 /****************************************************************************/
  75 G_DEFINE_TYPE (glFontSample, gl_font_sample, GTK_TYPE_DRAWING_AREA)
  76
  77
  78 /*****************************************************************************/
  79 /* Class Init Function.                                                      */
  80 /*****************************************************************************/
  81 static void
  82 gl_font_sample_class_init (glFontSampleClass *class)
  83 {
  84         GObjectClass   *gobject_class = G_OBJECT_CLASS (class);
  85         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  86
  87         gl_font_sample_parent_class = g_type_class_peek_parent (class);
  88
  89         gobject_class->finalize    = gl_font_sample_finalize;
  90
  91         widget_class->style_set    = style_set_cb;
  92         widget_class->draw         = draw_cb;
  93 }
  94
  95
  96 /*****************************************************************************/
  97 /* Object Instance Init Function.                                            */
  98 /*****************************************************************************/
  99 static void
 100 gl_font_sample_init (glFontSample *this)
 101 {
 102         gtk_widget_set_has_window (GTK_WIDGET (this), FALSE);
 103
 104         this->priv = g_new0 (glFontSamplePrivate, 1);
 105 }
 106
 107
 108 /*****************************************************************************/
 109 /* Finalize Method.                                                          */
 110 /*****************************************************************************/
 111 static void
 112 gl_font_sample_finalize (GObject *object)
 113 {
 114         glFontSample *this = GL_FONT_SAMPLE (object);
 115
 116         g_return_if_fail (object != NULL);
 117         g_return_if_fail (GL_IS_FONT_SAMPLE (object));
 118
 119         g_free (this->priv->sample_text);
 120         g_free (this->priv->font_family);
 121         g_free (this->priv);
 122
 123         G_OBJECT_CLASS (gl_font_sample_parent_class)->finalize (object);
 124 }
 125
 126
 127 /*****************************************************************************/
 128 /** New Object Generator.                                                    */
 129 /*****************************************************************************/
 130 GtkWidget *
 131 gl_font_sample_new (gint         w,
 132                     gint         h,
 133                     const gchar *sample_text,
 134                     const gchar *font_family)
 135 {
 136         glFontSample *this;
 137
 138         this = g_object_new (GL_TYPE_FONT_SAMPLE, NULL);
 139
 140         this->priv->sample_text = g_strdup (sample_text);
 141         this->priv->font_family = g_strdup (font_family);
 142
 143         gtk_widget_set_size_request (GTK_WIDGET (this), w, h);
 144
 145         return GTK_WIDGET (this);
 146 }
 147
 148
 149 /*--------------------------------------------------------------------------*/
 150 /* Style set handler (updates colors when style/theme changes).             */
 151 /*--------------------------------------------------------------------------*/
 152 static void
 153 style_set_cb (GtkWidget        *widget,
 154               GtkStyle         *previous_style)
 155 {
 156         redraw (GL_FONT_SAMPLE (widget));
 157 }
 158
 159
 160 /*****************************************************************************/
 161 /* Request redraw.                                                           */
 162 /*****************************************************************************/
 163 static void
 164 redraw (glFontSample  *this)
 165 {
 166         GdkWindow     *window;
 167         GtkAllocation  allocation;
 168
 169         window = gtk_widget_get_window (GTK_WIDGET (this));
 170
 171         if (window)
 172         {
 173                 gtk_widget_get_allocation (GTK_WIDGET (this), &allocation);
 174                 gdk_window_invalidate_rect (window, &allocation, FALSE);
 175         }
 176 }
 177
 178
 179 /*****************************************************************************/
 180 /* "Expose event" callback.                                                  */
 181 /*****************************************************************************/
 182 static gboolean
 183 draw_cb (GtkWidget      *widget,
 184          cairo_t        *cr)
 185 {
 186         draw_sample (GL_FONT_SAMPLE (widget), cr);
 187
 188         return FALSE;
 189 }
 190
 191
 192 /*****************************************************************************/
 193 /* Draw sample.                                                              */
 194 /*****************************************************************************/
 195 static void
 196 draw_sample (glFontSample *this,
 197              cairo_t       *cr)
 198 {
 199         GtkAllocation         allocation;
 200         GtkStyle             *style;
 201         gdouble               w, h;
 202         guint                 fill_color, line_color;
 203         PangoLayout          *layout;
 204         PangoFontDescription *desc;
 205         PangoRectangle        ink_rect, logical_rect;
 206         gdouble               layout_x, layout_y, layout_width, layout_height;
 207
 208
 209         gtk_widget_get_allocation (GTK_WIDGET (this), &allocation);
 210         w = allocation.width;
 211         h = allocation.height;
 212
 213
 214         style = gtk_widget_get_style (GTK_WIDGET (this));
 215         if ( gtk_widget_is_sensitive (GTK_WIDGET (this)) )
 216         {
 217                 fill_color = gl_color_from_gdk_color (&style->light[GTK_STATE_NORMAL]);
 218                 line_color = gl_color_from_gdk_color (&style->fg[GTK_STATE_NORMAL]);
 219         }
 220         else
 221         {
 222                 fill_color = GL_COLOR_NONE;
 223                 line_color = gl_color_from_gdk_color (&style->fg[GTK_STATE_INSENSITIVE]);
 224         }
 225
 226
 227         cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
 228
 229         cairo_rectangle( cr, 1, 1, w-2, h-2 );
 230
 231         cairo_set_source_rgba (cr, GL_COLOR_RGBA_ARGS (fill_color));
 232         cairo_fill_preserve( cr );
 233
 234         cairo_set_source_rgb (cr, GL_COLOR_RGB_ARGS (line_color));
 235         cairo_set_line_width (cr, 1.0);
 236         cairo_stroke (cr);
 237
 238
 239         cairo_set_antialias (cr, CAIRO_ANTIALIAS_DEFAULT);
 240
 241
 242         layout = pango_cairo_create_layout (cr);
 243
 244         desc = pango_font_description_new ();
 245         pango_font_description_set_family (desc, this->priv->font_family);
 246         pango_font_description_set_weight (desc, PANGO_WEIGHT_NORMAL);
 247         pango_font_description_set_style  (desc, PANGO_STYLE_NORMAL);
 248         pango_font_description_set_size   (desc, 0.6 * (h-1) * PANGO_SCALE);
 249
 250         pango_layout_set_font_description (layout, desc);
 251         pango_font_description_free       (desc);
 252
 253         pango_layout_set_text (layout, this->priv->sample_text, -1);
 254         pango_layout_set_width (layout, -1);
 255         pango_layout_get_pixel_extents (layout, &ink_rect, &logical_rect);
 256         layout_width  = MAX (logical_rect.width, ink_rect.width);
 257         layout_height = MAX (logical_rect.height, ink_rect.height);
 258
 259         layout_x = (w - layout_width) / 2.0;
 260         layout_y = (h - layout_height) / 2.0;
 261
 262         if (ink_rect.x < logical_rect.x)
 263         {
 264                 layout_x += logical_rect.x - ink_rect.x;
 265         }
 266
 267         if (ink_rect.y < logical_rect.y)
 268         {
 269                 layout_y += logical_rect.y - ink_rect.y;
 270         }
 271
 272         cairo_set_source_rgba (cr, GL_COLOR_RGBA_ARGS (line_color));
 273         cairo_move_to (cr, layout_x, layout_y);
 274         pango_cairo_show_layout (cr, layout);
 275
 276         g_object_unref (layout);
 277 }
 278
 279
 280
 281 /*
 282  * Local Variables:       -- emacs
 283  * mode: C                -- emacs
 284  * c-basic-offset: 8      -- emacs
 285  * tab-width: 8           -- emacs
 286  * indent-tabs-mode: nil  -- emacs
 287  * End:                   -- emacs
 288  */