src/gtk/gtkshruler.c

   1 /* GtkSHRuler
   2  *
   3  *  Copyright (C) 2000-2011 Alfons Hoogervorst & The Claws Mail Team
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 3 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /* I derived this class from hruler. S in HRuler could be read as
  20  * Sylpheed (sylpheed.good-day.net), but also [S]ettable HRuler.
  21  * I basically ripped apart the draw_ticks member of HRuler; it
  22  * now draws the ticks at ruler->max_size. so gtk_ruler_set_range's
  23  * last parameter has the distance between two ticks (which is
  24  * the width of the fixed font character!
  25  *
  26  * -- Alfons
  27  */
  28
  29 #include <math.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <gtk/gtk.h>
  33 #include "gtkshruler.h"
  34 #include "utils.h"
  35 #include "gtkutils.h"
  36
  37 #if !GTK_CHECK_VERSION(2,24,0)
  38
  39 #define RULER_HEIGHT          14
  40 #define MINIMUM_INCR          5
  41 #define MAXIMUM_SUBDIVIDE     5
  42 #define MAXIMUM_SCALES        10
  43
  44 #define ROUND(x) ((int) ((x) + 0.5))
  45
  46 static void gtk_shruler_class_init      (GtkSHRulerClass *klass);
  47 static void gtk_shruler_init            (GtkSHRuler      *hruler);
  48 static void gtk_shruler_draw_ticks      (GtkRuler        *ruler);
  49
  50 GType
  51 gtk_shruler_get_type(void)
  52 {
  53         static GType shruler_type = 0;
  54
  55         if ( !shruler_type ) {
  56                 static const GTypeInfo shruler_info = {
  57                         sizeof (GtkSHRulerClass),
  58
  59                         (GBaseInitFunc) NULL,
  60                         (GBaseFinalizeFunc) NULL,
  61
  62                         (GClassInitFunc) gtk_shruler_class_init,
  63                         (GClassFinalizeFunc) NULL,
  64                         NULL,   /* class_data */
  65
  66                         sizeof (GtkSHRuler),
  67                         0,      /* n_preallocs */
  68                         (GInstanceInitFunc) gtk_shruler_init,
  69                 };
  70                 /* inherit from GtkHRuler */
  71                 shruler_type = g_type_register_static (GTK_TYPE_HRULER, "GtkSHRuler", &shruler_info, (GTypeFlags)0);
  72         }
  73         return shruler_type;
  74 }
  75
  76 static void
  77 gtk_shruler_class_init(GtkSHRulerClass * klass)
  78 {
  79         GtkWidgetClass * widget_class;
  80         GtkRulerClass * hruler_class;
  81
  82         widget_class = GTK_WIDGET_CLASS(klass);
  83         hruler_class = GTK_RULER_CLASS(klass);
  84
  85         /* just neglect motion notify events */
  86         widget_class->motion_notify_event = NULL /* gtk_shruler_motion_notify */;
  87
  88         /* we want the old ruler draw ticks... */
  89         /* ruler_class->draw_ticks = gtk_hruler_draw_ticks; */
  90         hruler_class->draw_ticks = gtk_shruler_draw_ticks;
  91
  92         /* unimplemented draw pos */
  93         hruler_class->draw_pos = NULL;
  94 /*
  95         hruler_class->draw_pos = gtk_shruler_draw_pos;
  96 */
  97 }
  98
  99 static void
 100 gtk_shruler_init (GtkSHRuler * shruler)
 101 {
 102         GtkWidget * widget;
 103
 104         widget = GTK_WIDGET (shruler);
 105         widget->requisition.width = widget->style->xthickness * 2 + 1;
 106         widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
 107 }
 108
 109
 110 GtkWidget*
 111 gtk_shruler_new(void)
 112 {
 113         return GTK_WIDGET( g_object_new( gtk_shruler_get_type(), NULL ) );
 114 }
 115
 116 static void
 117 gtk_shruler_draw_ticks(GtkRuler *ruler)
 118 {
 119         GtkWidget *widget;
 120         cairo_t *cr;
 121         gint i;
 122         gint width, height;
 123         gint xthickness;
 124         gint ythickness;
 125         gint pos;
 126
 127         cm_return_if_fail (ruler != NULL);
 128         cm_return_if_fail (GTK_IS_HRULER (ruler));
 129
 130         if (!gtkut_widget_is_drawable (GTK_WIDGET(ruler)))
 131                 return;
 132
 133         widget = GTK_WIDGET (ruler);
 134
 135         cr = gdk_cairo_create(ruler->backing_store);
 136         cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
 137         cairo_set_line_width(cr, 1.);
 138         gdk_cairo_set_source_color(cr, &gtk_widget_get_style(widget)->text[GTK_STATE_NORMAL]);
 139
 140         xthickness = widget->style->xthickness;
 141         ythickness = widget->style->ythickness;
 142
 143         width = widget->allocation.width;
 144         height = widget->allocation.height - ythickness * 2;
 145
 146         gtk_paint_box (widget->style, ruler->backing_store,
 147                        GTK_STATE_NORMAL, GTK_SHADOW_OUT,
 148                        NULL, widget, "hruler",
 149                        0, 0,
 150                        widget->allocation.width, widget->allocation.height);
 151
 152         /* assume ruler->max_size has the char width */
 153         /* i is increment of char_width,  pos is label number
 154          * y position is based on height of widget itself */
 155         for ( i = 0, pos = 0; i < widget->allocation.width - xthickness; i += ruler->max_size, pos++ ) {
 156                 gint length = height / 8;
 157
 158                 if ( pos % 10 == 0 ) length = ( 2 * height / 3 );
 159                 else if ( pos % 5 == 0 ) length = ( height / 3 );
 160
 161                 cairo_move_to(cr, i, height + ythickness);
 162                 cairo_line_to(cr, i, height - length);
 163                 cairo_stroke(cr);
 164
 165                 if ( pos % 10 == 0 ) {
 166                         gchar buf[8];
 167                         PangoLayout *layout;
 168
 169                         /* draw label */
 170                         g_snprintf(buf, sizeof buf, "%d", pos);
 171
 172                         layout = gtk_widget_create_pango_layout
 173                                 (GTK_WIDGET(ruler), buf);
 174
 175                         cairo_move_to(cr, i+2, 0);
 176                         pango_cairo_show_layout(cr, layout);
 177
 178                         g_object_unref(layout);
 179                 }
 180         }
 181
 182         cairo_destroy(cr);
 183 }
 184 #endif