src/gtk/gtkshruler.c

   1 /* GtkSHRuler
   2  *
   3  *  Copyright (C) 2000-2005 Alfons Hoogervorst & The Sylpheed Claws 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 2 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, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 /* I derived this class from hruler. S in HRuler could be read as
  22  * Sylpheed (sylpheed.good-day.net), but also [S]ettable HRuler.
  23  * I basically ripped apart the draw_ticks member of HRuler; it
  24  * now draws the ticks at ruler->max_size. so gtk_ruler_set_range's
  25  * last parameter has the distance between two ticks (which is
  26  * the width of the fixed font character!
  27  *
  28  * -- Alfons
  29  */
  30
  31 #include <math.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <gtk/gtkhruler.h>
  35 #include "gtkshruler.h"
  36
  37 #define RULER_HEIGHT          14
  38 #define MINIMUM_INCR          5
  39 #define MAXIMUM_SUBDIVIDE     5
  40 #define MAXIMUM_SCALES        10
  41
  42 #define ROUND(x) ((int) ((x) + 0.5))
  43
  44 static void gtk_shruler_class_init      (GtkSHRulerClass *klass);
  45 static void gtk_shruler_init            (GtkSHRuler      *hruler);
  46 static void gtk_shruler_draw_ticks      (GtkRuler        *ruler);
  47 #if 0
  48 static void gtk_shruler_draw_pos        (GtkRuler        *ruler);
  49 #endif
  50
  51 GType
  52 gtk_shruler_get_type(void)
  53 {
  54         static GType shruler_type = 0;
  55
  56         if ( !shruler_type ) {
  57                 static const GTypeInfo shruler_info = {
  58                         sizeof (GtkSHRulerClass),
  59
  60                         (GBaseInitFunc) NULL,
  61                         (GBaseFinalizeFunc) NULL,
  62
  63                         (GClassInitFunc) gtk_shruler_class_init,
  64                         (GClassFinalizeFunc) NULL,
  65                         NULL,   /* class_data */
  66
  67                         sizeof (GtkSHRuler),
  68                         0,      /* n_preallocs */
  69                         (GInstanceInitFunc) gtk_shruler_init,
  70                 };
  71                 /* inherit from GtkHRuler */
  72                 shruler_type = g_type_register_static (GTK_TYPE_HRULER, "GtkSHRuler", &shruler_info, (GTypeFlags)0);
  73         }
  74         return shruler_type;
  75 }
  76
  77 static void
  78 gtk_shruler_class_init(GtkSHRulerClass * klass)
  79 {
  80         GtkWidgetClass * widget_class;
  81         GtkRulerClass * hruler_class;
  82
  83         widget_class = GTK_WIDGET_CLASS(klass);
  84         hruler_class = GTK_RULER_CLASS(klass);
  85
  86         /* just neglect motion notify events */
  87         widget_class->motion_notify_event = NULL /* gtk_shruler_motion_notify */;
  88
  89         /* we want the old ruler draw ticks... */
  90         /* ruler_class->draw_ticks = gtk_hruler_draw_ticks; */
  91         hruler_class->draw_ticks = gtk_shruler_draw_ticks;
  92
  93         /* unimplemented draw pos */
  94         hruler_class->draw_pos = NULL;
  95 /*
  96         hruler_class->draw_pos = gtk_shruler_draw_pos;
  97 */
  98 }
  99
 100 static void
 101 gtk_shruler_init (GtkSHRuler * shruler)
 102 {
 103         GtkWidget * widget;
 104
 105         widget = GTK_WIDGET (shruler);
 106         widget->requisition.width = widget->style->xthickness * 2 + 1;
 107         widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
 108 }
 109
 110
 111 GtkWidget*
 112 gtk_shruler_new(void)
 113 {
 114         return GTK_WIDGET( g_object_new( gtk_shruler_get_type(), NULL ) );
 115 }
 116
 117 static void
 118 gtk_shruler_draw_ticks(GtkRuler *ruler)
 119 {
 120         GtkWidget *widget;
 121         GdkGC *gc, *bg_gc;
 122         gint i;
 123         gint width, height;
 124         gint xthickness;
 125         gint ythickness;
 126         gint pos;
 127
 128         g_return_if_fail (ruler != NULL);
 129         g_return_if_fail (GTK_IS_HRULER (ruler));
 130
 131         if (!GTK_WIDGET_DRAWABLE (ruler))
 132                 return;
 133
 134         widget = GTK_WIDGET (ruler);
 135
 136         gc = widget->style->fg_gc[GTK_STATE_NORMAL];
 137         bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
 138
 139         xthickness = widget->style->xthickness;
 140         ythickness = widget->style->ythickness;
 141
 142         width = widget->allocation.width;
 143         height = widget->allocation.height - ythickness * 2;
 144
 145         gtk_paint_box (widget->style, ruler->backing_store,
 146                        GTK_STATE_NORMAL, GTK_SHADOW_OUT,
 147                        NULL, widget, "hruler",
 148                        0, 0,
 149                        widget->allocation.width, widget->allocation.height);
 150
 151 #if 0
 152         gdk_draw_line (ruler->backing_store, gc,
 153                        xthickness,
 154                        height + ythickness,
 155                        widget->allocation.width - xthickness,
 156                        height + ythickness);
 157 #endif
 158
 159         /* assume ruler->max_size has the char width */
 160         /* i is increment of char_width,  pos is label number
 161          * y position is based on height of widget itself */
 162         for ( i = 0, pos = 0; i < widget->allocation.width - xthickness; i += ruler->max_size, pos++ ) {
 163                 gint length = height / 8;
 164
 165                 if ( pos % 10 == 0 ) length = ( 2 * height / 3 );
 166                 else if ( pos % 5 == 0 ) length = ( height / 3 );
 167
 168                 gdk_draw_line(ruler->backing_store, gc,
 169                               i, height + ythickness,
 170                               i, height - length);
 171
 172                 if ( pos % 10 == 0 ) {
 173                         gchar buf[8];
 174                         PangoLayout *layout;
 175
 176                         /* draw label */
 177                         g_snprintf(buf, sizeof buf, "%d", pos);
 178
 179                         layout = gtk_widget_create_pango_layout
 180                                 (GTK_WIDGET(ruler), buf);
 181
 182                         gdk_draw_layout(ruler->backing_store, gc, i + 2,
 183                                         0, layout);
 184
 185                         g_object_unref(layout);
 186                 }
 187         }
 188 }
 189
 190 /* gtk_ruler_set_pos() - does not work yet, need to reimplement
 191  * gtk_ruler_draw_pos(). */
 192 void
 193 gtk_shruler_set_pos(GtkSHRuler * ruler, gfloat pos)
 194 {
 195         GtkRuler * ruler_;
 196         g_return_if_fail( ruler != NULL );
 197
 198         ruler_ = GTK_RULER(ruler);
 199
 200         if ( pos < ruler_->lower )
 201                 pos = ruler_->lower;
 202         if ( pos > ruler_->upper )
 203                 pos = ruler_->upper;
 204
 205         ruler_->position = pos;
 206
 207         /*  Make sure the ruler has been allocated already  */
 208         if ( ruler_->backing_store != NULL )
 209                 gtk_ruler_draw_pos(ruler_);
 210 }