src/gtk/gtkshruler.c

   1 /* GtkSHRuler
   2  *
   3  *  Copyright (C) 2000-2005 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 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
  48 GType
  49 gtk_shruler_get_type(void)
  50 {
  51         static GType shruler_type = 0;
  52
  53         if ( !shruler_type ) {
  54                 static const GTypeInfo shruler_info = {
  55                         sizeof (GtkSHRulerClass),
  56
  57                         (GBaseInitFunc) NULL,
  58                         (GBaseFinalizeFunc) NULL,
  59
  60                         (GClassInitFunc) gtk_shruler_class_init,
  61                         (GClassFinalizeFunc) NULL,
  62                         NULL,   /* class_data */
  63
  64                         sizeof (GtkSHRuler),
  65                         0,      /* n_preallocs */
  66                         (GInstanceInitFunc) gtk_shruler_init,
  67                 };
  68                 /* inherit from GtkHRuler */
  69                 shruler_type = g_type_register_static (GTK_TYPE_HRULER, "GtkSHRuler", &shruler_info, (GTypeFlags)0);
  70         }
  71         return shruler_type;
  72 }
  73
  74 static void
  75 gtk_shruler_class_init(GtkSHRulerClass * klass)
  76 {
  77         GtkWidgetClass * widget_class;
  78         GtkRulerClass * hruler_class;
  79
  80         widget_class = GTK_WIDGET_CLASS(klass);
  81         hruler_class = GTK_RULER_CLASS(klass);
  82
  83         /* just neglect motion notify events */
  84         widget_class->motion_notify_event = NULL /* gtk_shruler_motion_notify */;
  85
  86         /* we want the old ruler draw ticks... */
  87         /* ruler_class->draw_ticks = gtk_hruler_draw_ticks; */
  88         hruler_class->draw_ticks = gtk_shruler_draw_ticks;
  89
  90         /* unimplemented draw pos */
  91         hruler_class->draw_pos = NULL;
  92 /*
  93         hruler_class->draw_pos = gtk_shruler_draw_pos;
  94 */
  95 }
  96
  97 static void
  98 gtk_shruler_init (GtkSHRuler * shruler)
  99 {
 100         GtkWidget * widget;
 101
 102         widget = GTK_WIDGET (shruler);
 103         widget->requisition.width = widget->style->xthickness * 2 + 1;
 104         widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
 105 }
 106
 107
 108 GtkWidget*
 109 gtk_shruler_new(void)
 110 {
 111         return GTK_WIDGET( g_object_new( gtk_shruler_get_type(), NULL ) );
 112 }
 113
 114 static void
 115 gtk_shruler_draw_ticks(GtkRuler *ruler)
 116 {
 117         GtkWidget *widget;
 118         GdkGC *gc, *bg_gc;
 119         gint i;
 120         gint width, height;
 121         gint xthickness;
 122         gint ythickness;
 123         gint pos;
 124
 125         g_return_if_fail (ruler != NULL);
 126         g_return_if_fail (GTK_IS_HRULER (ruler));
 127
 128         if (!GTK_WIDGET_DRAWABLE (ruler))
 129                 return;
 130
 131         widget = GTK_WIDGET (ruler);
 132
 133         gc = widget->style->fg_gc[GTK_STATE_NORMAL];
 134         bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
 135
 136         xthickness = widget->style->xthickness;
 137         ythickness = widget->style->ythickness;
 138
 139         width = widget->allocation.width;
 140         height = widget->allocation.height - ythickness * 2;
 141
 142         gtk_paint_box (widget->style, ruler->backing_store,
 143                        GTK_STATE_NORMAL, GTK_SHADOW_OUT,
 144                        NULL, widget, "hruler",
 145                        0, 0,
 146                        widget->allocation.width, widget->allocation.height);
 147
 148         /* assume ruler->max_size has the char width */
 149         /* i is increment of char_width,  pos is label number
 150          * y position is based on height of widget itself */
 151         for ( i = 0, pos = 0; i < widget->allocation.width - xthickness; i += ruler->max_size, pos++ ) {
 152                 gint length = height / 8;
 153
 154                 if ( pos % 10 == 0 ) length = ( 2 * height / 3 );
 155                 else if ( pos % 5 == 0 ) length = ( height / 3 );
 156
 157                 gdk_draw_line(ruler->backing_store, gc,
 158                               i, height + ythickness,
 159                               i, height - length);
 160
 161                 if ( pos % 10 == 0 ) {
 162                         gchar buf[8];
 163                         PangoLayout *layout;
 164
 165                         /* draw label */
 166                         g_snprintf(buf, sizeof buf, "%d", pos);
 167
 168                         layout = gtk_widget_create_pango_layout
 169                                 (GTK_WIDGET(ruler), buf);
 170
 171                         gdk_draw_layout(ruler->backing_store, gc, i + 2,
 172                                         0, layout);
 173
 174                         g_object_unref(layout);
 175                 }
 176         }
 177 }
 178
 179 /* gtk_ruler_set_pos() - does not work yet, need to reimplement
 180  * gtk_ruler_draw_pos(). */
 181 void
 182 gtk_shruler_set_pos(GtkSHRuler * ruler, gfloat pos)
 183 {
 184         GtkRuler * ruler_;
 185         g_return_if_fail( ruler != NULL );
 186
 187         ruler_ = GTK_RULER(ruler);
 188
 189         if ( pos < ruler_->lower )
 190                 pos = ruler_->lower;
 191         if ( pos > ruler_->upper )
 192                 pos = ruler_->upper;
 193
 194         ruler_->position = pos;
 195
 196         /*  Make sure the ruler has been allocated already  */
 197         if ( ruler_->backing_store != NULL )
 198                 gtk_ruler_draw_pos(ruler_);
 199 }