gntutils.h

   1 /**
   2  * @file gntutils.h Some utility functions
   3  * @ingroup gnt
   4  */
   5 /*
   6  * GNT - The GLib Ncurses Toolkit
   7  *
   8  * GNT is the legal property of its developers, whose names are too numerous
   9  * to list here.  Please refer to the COPYRIGHT file distributed with this
  10  * source distribution.
  11  *
  12  * This library is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  25  */
  26
  27 #include <glib.h>
  28
  29 #include "gnt.h"
  30 #include "gnttextview.h"
  31 #include "gntwidget.h"
  32
  33 typedef gpointer (*GDupFunc)(gconstpointer data);
  34
  35 /**
  36  * Compute the width and height required to view the text on the screen.
  37  *
  38  * @param text     The text to be displayed.
  39  * @param width    The width required is set here, if not @c NULL.
  40  * @param height   The height required is set here, if not @c NULL.
  41  */
  42 void gnt_util_get_text_bound(const char *text, int *width, int *height);
  43
  44 /* excluding *end */
  45 /**
  46  * Get the onscreen width of a string, or a substring.
  47  *
  48  * @param start  The beginning of the string.
  49  * @param end    The end of the string. The width returned is the width
  50  *               upto (but not including) end. If end is NULL, then start
  51  *               is considered as a @c NULL-terminated string.
  52  *
  53  * @return       The on-screen width of the string.
  54  */
  55 int gnt_util_onscreen_width(const char *start, const char *end);
  56
  57 /**
  58  * Computes and returns the string after a specific number of onscreen characters.
  59  *
  60  * @param str  The string.
  61  * @param len  The length to consider. If non-positive, the entire screenlength is used.
  62  * @param w    The actual width of the string upto the returned offset, if not @c NULL.
  63  *
  64  * @return     The string after len offset.
  65  */
  66 const char *gnt_util_onscreen_width_to_pointer(const char *str, int len, int *w);
  67
  68 /**
  69  * Inserts newlines in 'string' where necessary so that its onscreen width is
  70  * no more than 'maxw'.
  71  *
  72  * @param string  The string.
  73  * @param maxw    The width that the string should fit into. If maxw is <= 0,
  74  *                then the available maximum width is used.
  75  *
  76  * @return  A newly allocated string that needs to be freed by the caller.
  77  */
  78 char * gnt_util_onscreen_fit_string(const char *string, int maxw);
  79
  80 /**
  81  * Duplicate the contents of a hastable.
  82  *
  83  * @param src         The source hashtable.
  84  * @param hash        The hash-function to use.
  85  * @param equal       The hash-equal function to use.
  86  * @param key_d       The key-destroy function to use.
  87  * @param value_d     The value-destroy function to use.
  88  * @param key_dup     The function to use to duplicate the key.
  89  * @param value_dup   The function to use to duplicate the value.
  90  *
  91  * @return    The new hashtable.
  92  */
  93 GHashTable * g_hash_table_duplicate(GHashTable *src, GHashFunc hash, GEqualFunc equal, GDestroyNotify key_d, GDestroyNotify value_d, GDupFunc key_dup, GDupFunc value_dup);
  94
  95 /**
  96  * To be used with g_signal_new. Look in the key_pressed signal-definition in
  97  * gntwidget.c for usage.
  98  *
  99  * @param ihint           NA
 100  * @param return_accu     NA
 101  * @param handler_return  NA
 102  * @param dummy           NA
 103  *
 104  * @return  NA
 105  */
 106 gboolean gnt_boolean_handled_accumulator(GSignalInvocationHint *ihint, GValue *return_accu, const GValue *handler_return, gpointer dummy);
 107
 108 /**
 109  * Get a helpful display about the bindings of a widget.
 110  *
 111  * @param widget The widget to get bindings for.
 112  *
 113  * @return Returns a GntTree populated with "key" -> "binding" for the widget.
 114  */
 115 GntWidget * gnt_widget_bindings_view(GntWidget *widget);
 116
 117 /**
 118  * Parse widgets from an XML description. For example,
 119  *
 120  * @code
 121  * GntWidget *win, *button;
 122  * gnt_util_parse_widgets("\
 123  *      <vwindow id='0' fill='0' align='2'>     \
 124  *          <label>This is a test</label>       \
 125  *          <button id='1'>OK</button>          \
 126  *      </vwindow>",
 127  *   2, &win, &button);
 128  * @endcode
 129  *
 130  * @param string  The XML string.
 131  * @param num     The number of widgets to return, followed by 'num' GntWidget **
 132  */
 133 void gnt_util_parse_widgets(const char *string, int num, ...);
 134
 135 /**
 136  * Parse an XHTML string and add it in a GntTextView with
 137  * appropriate text flags.
 138  *
 139  * @param string   The XHTML string
 140  * @param tv       The GntTextView
 141  * @return  @c TRUE if the string was added to the textview properly, @c FALSE otherwise.
 142  *
 143  * @since 2.2.0
 144  */
 145 gboolean gnt_util_parse_xhtml_to_textview(const char *string, GntTextView *tv);
 146
 147 /**
 148  * Make some keypress activate a button when some key is pressed with 'wid' in focus.
 149  *
 150  * @param widget  The widget
 151  * @param key     The key to trigger the button
 152  * @param button  The button to trigger
 153  *
 154  * @since 2.0.0 (gnt), 2.1.0 (pidgin)
 155  */
 156 void gnt_util_set_trigger_widget(GntWidget *widget, const char *key, GntWidget *button);
 157