src/list_window.h

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2017 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifndef LIST_WINDOW_H
  21 #define LIST_WINDOW_H
  22
  23 #include "config.h"
  24 #include "command.h"
  25 #include "colors.h"
  26 #include "ncmpc_curses.h"
  27
  28 #include <glib.h>
  29 #include <stdbool.h>
  30
  31 typedef const char *
  32 (*list_window_callback_fn_t)(unsigned i, void *data);
  33
  34 typedef void
  35 (*list_window_paint_callback_t)(WINDOW *w, unsigned i,
  36                                 unsigned y, unsigned width,
  37                                 bool selected,
  38                                 const void *data);
  39
  40 struct list_window {
  41         WINDOW *w;
  42         unsigned rows, cols;
  43
  44         /**
  45          * Number of items in this list.
  46          */
  47         unsigned length;
  48
  49         unsigned start;
  50         unsigned selected;
  51
  52         /**
  53          * Represents the base item.
  54          */
  55         unsigned range_base;
  56
  57         /**
  58          * Range selection activated?
  59          */
  60         bool range_selection;
  61
  62         bool hide_cursor;
  63 };
  64
  65 /**
  66  * The bounds of a range selection, see list_window_get_range().
  67  */
  68 struct list_window_range {
  69         /**
  70          * The index of the first selected item.
  71          */
  72         unsigned start;
  73
  74         /**
  75          * The index after the last selected item.  The selection is
  76          * empty when this is the same as "start".
  77          */
  78         unsigned end;
  79 };
  80
  81 /* create a new list window */
  82 struct list_window *list_window_init(WINDOW *w,
  83                                      unsigned width, unsigned height);
  84
  85 /* destroy a list window */
  86 void list_window_free(struct list_window *lw);
  87
  88 /* reset a list window (selected=0, start=0) */
  89 void list_window_reset(struct list_window *lw);
  90
  91 void
  92 list_window_resize(struct list_window *lw, unsigned width, unsigned height);
  93
  94 void
  95 list_window_set_length(struct list_window *lw, unsigned length);
  96
  97 /* paint a list window */
  98 void list_window_paint(const struct list_window *lw,
  99                        list_window_callback_fn_t callback,
 100                        void *callback_data);
 101
 102 void
 103 list_window_paint2(const struct list_window *lw,
 104                    list_window_paint_callback_t paint_callback,
 105                    const void *callback_data);
 106
 107 /* perform basic list window commands (movement) */
 108 bool
 109 list_window_cmd(struct list_window *lw, command_t cmd);
 110
 111 /**
 112  * Scroll the window.  Returns true if the command has been
 113  * consumed.
 114  */
 115 bool
 116 list_window_scroll_cmd(struct list_window *lw, command_t cmd);
 117
 118 #ifdef HAVE_GETMOUSE
 119 /**
 120  * The mouse was clicked.  Check if the list should be scrolled
 121  * Returns non-zero if the mouse event has been handled.
 122  */
 123 bool
 124 list_window_mouse(struct list_window *lw, unsigned long bstate, int y);
 125 #endif
 126
 127 /**
 128  * Centers the visible range around item n on the list.
 129  */
 130 void
 131 list_window_center(struct list_window *lw, unsigned n);
 132
 133 /**
 134  * Scrolls the view to item n, as if the cursor would have been moved
 135  * to the position.
 136  */
 137 void
 138 list_window_scroll_to(struct list_window *lw, unsigned n);
 139
 140 /**
 141  * Sets the position of the cursor.  Disables range selection.
 142  */
 143 void
 144 list_window_set_cursor(struct list_window *lw, unsigned i);
 145
 146 /**
 147  * Moves the cursor.  Modifies the range if range selection is
 148  * enabled.
 149  */
 150 void
 151 list_window_move_cursor(struct list_window *lw, unsigned n);
 152
 153 /**
 154  * Ensures that the cursor is visible on the screen, i.e. it is not
 155  * outside the current scrolling range.
 156  */
 157 void
 158 list_window_fetch_cursor(struct list_window *lw);
 159
 160 /**
 161  * Determines the lower and upper bound of the range selection.  If
 162  * range selection is disabled, it returns the cursor position (range
 163  * length is 1).
 164  */
 165 void
 166 list_window_get_range(const struct list_window *lw,
 167                       struct list_window_range *range);
 168
 169 /* find a string in a list window */
 170 bool
 171 list_window_find(struct list_window *lw,
 172                  list_window_callback_fn_t callback,
 173                  void *callback_data,
 174                  const char *str,
 175                  bool wrap,
 176                  bool bell_on_wrap);
 177
 178 /* find a string in a list window (reversed) */
 179 bool
 180 list_window_rfind(struct list_window *lw,
 181                   list_window_callback_fn_t callback,
 182                   void *callback_data,
 183                   const char *str,
 184                   bool wrap,
 185                   bool bell_on_wrap);
 186
 187 /* find a string in a list window which begins with the given characters in *str */
 188 bool
 189 list_window_jump(struct list_window *lw,
 190                  list_window_callback_fn_t callback,
 191                  void *callback_data,
 192                  const char *str);
 193
 194 #endif