1 | /*
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2 | * menubox.c -- implements the menu box
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3 | *
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4 | * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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5 | * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
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6 | *
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7 | * This program is free software; you can redistribute it and/or
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8 | * modify it under the terms of the GNU General Public License
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9 | * as published by the Free Software Foundation; either version 2
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10 | * of the License, or (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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20 | */
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21 |
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22 | /*
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23 | * Changes by Clifford Wolf (god@clifford.at)
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24 | *
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25 | * [ 1998-06-13 ]
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26 | *
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27 | * *) A bugfix for the Page-Down problem
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28 | *
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29 | * *) Formerly when I used Page Down and Page Up, the cursor would be set
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30 | * to the first position in the menu box. Now lxdialog is a bit
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31 | * smarter and works more like other menu systems (just have a look at
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32 | * it).
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33 | *
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34 | * *) Formerly if I selected something my scrolling would be broken because
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35 | * lxdialog is re-invoked by the Menuconfig shell script, can't
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36 | * remember the last scrolling position, and just sets it so that the
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37 | * cursor is at the bottom of the box. Now it writes the temporary file
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38 | * lxdialog.scrltmp which contains this information. The file is
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39 | * deleted by lxdialog if the user leaves a submenu or enters a new
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40 | * one, but it would be nice if Menuconfig could make another "rm -f"
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41 | * just to be sure. Just try it out - you will recognise a difference!
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42 | *
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43 | * [ 1998-06-14 ]
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44 | *
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45 | * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
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46 | * and menus change their size on the fly.
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47 | *
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48 | * *) If for some reason the last scrolling position is not saved by
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49 | * lxdialog, it sets the scrolling so that the selected item is in the
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50 | * middle of the menu box, not at the bottom.
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51 | *
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52 | * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
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53 | * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
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54 | * This fixes a bug in Menuconfig where using ' ' to descend into menus
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55 | * would leave mis-synchronized lxdialog.scrltmp files lying around,
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56 | * fscanf would read in 'scroll', and eventually that value would get used.
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57 | */
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58 |
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59 | #include "dialog.h"
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60 |
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61 | static int menu_width, item_x;
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62 |
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63 | /*
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64 | * Print menu item
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65 | */
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66 | static void do_print_item(WINDOW * win, const char *item, int choice,
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67 | int selected, int hotkey)
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68 | {
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69 | int j;
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70 | char *menu_item = malloc(menu_width + 1);
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71 |
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72 | strncpy(menu_item, item, menu_width - item_x);
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73 | menu_item[menu_width] = 0;
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74 | j = first_alpha(menu_item, "YyNnMmHh");
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75 |
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76 | /* Clear 'residue' of last item */
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77 | wattrset(win, menubox_attr);
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78 | wmove(win, choice, 0);
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79 | #if OLD_NCURSES
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80 | {
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81 | int i;
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82 | for (i = 0; i < menu_width; i++)
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83 | waddch(win, ' ');
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84 | }
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85 | #else
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86 | wclrtoeol(win);
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87 | #endif
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88 | wattrset(win, selected ? item_selected_attr : item_attr);
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89 | mvwaddstr(win, choice, item_x, menu_item);
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90 | if (hotkey) {
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91 | wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
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92 | mvwaddch(win, choice, item_x + j, menu_item[j]);
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93 | }
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94 | if (selected) {
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95 | wmove(win, choice, item_x + 1);
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96 | }
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97 | free(menu_item);
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98 | wrefresh(win);
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99 | }
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100 |
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101 | #define print_item(index, choice, selected) \
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102 | do {\
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103 | int hotkey = (items[(index) * 2][0] != ':'); \
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104 | do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
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105 | } while (0)
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106 |
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107 | /*
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108 | * Print the scroll indicators.
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109 | */
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110 | static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
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111 | int height)
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112 | {
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113 | int cur_y, cur_x;
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114 |
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115 | getyx(win, cur_y, cur_x);
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116 |
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117 | wmove(win, y, x);
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118 |
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119 | if (scroll > 0) {
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120 | wattrset(win, uarrow_attr);
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121 | waddch(win, ACS_UARROW);
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122 | waddstr(win, "(-)");
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123 | } else {
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124 | wattrset(win, menubox_attr);
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125 | waddch(win, ACS_HLINE);
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126 | waddch(win, ACS_HLINE);
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127 | waddch(win, ACS_HLINE);
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128 | waddch(win, ACS_HLINE);
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129 | }
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130 |
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131 | y = y + height + 1;
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132 | wmove(win, y, x);
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133 | wrefresh(win);
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134 |
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135 | if ((height < item_no) && (scroll + height < item_no)) {
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136 | wattrset(win, darrow_attr);
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137 | waddch(win, ACS_DARROW);
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138 | waddstr(win, "(+)");
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139 | } else {
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140 | wattrset(win, menubox_border_attr);
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141 | waddch(win, ACS_HLINE);
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142 | waddch(win, ACS_HLINE);
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143 | waddch(win, ACS_HLINE);
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144 | waddch(win, ACS_HLINE);
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145 | }
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146 |
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147 | wmove(win, cur_y, cur_x);
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148 | wrefresh(win);
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149 | }
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150 |
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151 | /*
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152 | * Display the termination buttons.
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153 | */
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154 | static void print_buttons(WINDOW * win, int height, int width, int selected)
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155 | {
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156 | int x = width / 2 - 16;
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157 | int y = height - 2;
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158 |
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159 | print_button(win, "Select", y, x, selected == 0);
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160 | print_button(win, " Exit ", y, x + 12, selected == 1);
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161 | print_button(win, " Help ", y, x + 24, selected == 2);
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162 |
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163 | wmove(win, y, x + 1 + 12 * selected);
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164 | wrefresh(win);
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165 | }
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166 |
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167 | /* scroll up n lines (n may be negative) */
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168 | static void do_scroll(WINDOW *win, int *scroll, int n)
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169 | {
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170 | /* Scroll menu up */
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171 | scrollok(win, TRUE);
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172 | wscrl(win, n);
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173 | scrollok(win, FALSE);
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174 | *scroll = *scroll + n;
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175 | wrefresh(win);
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176 | }
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177 |
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178 | /*
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179 | * Display a menu for choosing among a number of options
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180 | */
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181 | int dialog_menu(const char *title, const char *prompt, int height, int width,
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182 | int menu_height, const char *current, int item_no,
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183 | const char *const *items)
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184 | {
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185 | int i, j, x, y, box_x, box_y;
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186 | int key = 0, button = 0, scroll = 0, choice = 0;
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187 | int first_item = 0, max_choice;
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188 | WINDOW *dialog, *menu;
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189 | FILE *f;
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190 |
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191 | max_choice = MIN(menu_height, item_no);
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192 |
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193 | /* center dialog box on screen */
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194 | x = (COLS - width) / 2;
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195 | y = (LINES - height) / 2;
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196 |
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197 | draw_shadow(stdscr, y, x, height, width);
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198 |
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199 | dialog = newwin(height, width, y, x);
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200 | keypad(dialog, TRUE);
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201 |
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202 | draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
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203 | wattrset(dialog, border_attr);
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204 | mvwaddch(dialog, height - 3, 0, ACS_LTEE);
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205 | for (i = 0; i < width - 2; i++)
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206 | waddch(dialog, ACS_HLINE);
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207 | wattrset(dialog, dialog_attr);
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208 | wbkgdset(dialog, dialog_attr & A_COLOR);
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209 | waddch(dialog, ACS_RTEE);
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210 |
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211 | print_title(dialog, title, width);
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212 |
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213 | wattrset(dialog, dialog_attr);
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214 | print_autowrap(dialog, prompt, width - 2, 1, 3);
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215 |
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216 | menu_width = width - 6;
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217 | box_y = height - menu_height - 5;
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218 | box_x = (width - menu_width) / 2 - 1;
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219 |
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220 | /* create new window for the menu */
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221 | menu = subwin(dialog, menu_height, menu_width,
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222 | y + box_y + 1, x + box_x + 1);
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223 | keypad(menu, TRUE);
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224 |
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225 | /* draw a box around the menu items */
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226 | draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
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227 | menubox_border_attr, menubox_attr);
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228 |
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229 | item_x = (menu_width - 70) / 2;
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230 |
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231 | /* Set choice to default item */
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232 | for (i = 0; i < item_no; i++)
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233 | if (strcmp(current, items[i * 2]) == 0)
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234 | choice = i;
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235 |
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236 | /* get the scroll info from the temp file */
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237 | if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
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238 | if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
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239 | (scroll + max_choice > choice) && (scroll >= 0) &&
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240 | (scroll + max_choice <= item_no)) {
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241 | first_item = scroll;
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242 | choice = choice - scroll;
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243 | fclose(f);
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244 | } else {
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245 | scroll = 0;
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246 | remove("lxdialog.scrltmp");
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247 | fclose(f);
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248 | f = NULL;
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249 | }
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250 | }
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251 | if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
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252 | if (choice >= item_no - max_choice / 2)
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253 | scroll = first_item = item_no - max_choice;
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254 | else
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255 | scroll = first_item = choice - max_choice / 2;
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256 | choice = choice - scroll;
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257 | }
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258 |
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259 | /* Print the menu */
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260 | for (i = 0; i < max_choice; i++) {
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261 | print_item(first_item + i, i, i == choice);
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262 | }
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263 |
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264 | wnoutrefresh(menu);
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265 |
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266 | print_arrows(dialog, item_no, scroll,
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267 | box_y, box_x + item_x + 1, menu_height);
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268 |
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269 | print_buttons(dialog, height, width, 0);
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270 | wmove(menu, choice, item_x + 1);
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271 | wrefresh(menu);
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272 |
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273 | while (key != ESC) {
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274 | key = wgetch(menu);
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275 |
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276 | if (key < 256 && isalpha(key))
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277 | key = tolower(key);
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278 |
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279 | if (strchr("ynmh", key))
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280 | i = max_choice;
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281 | else {
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282 | for (i = choice + 1; i < max_choice; i++) {
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283 | j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
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284 | if (key == tolower(items[(scroll + i) * 2 + 1][j]))
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285 | break;
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286 | }
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287 | if (i == max_choice)
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288 | for (i = 0; i < max_choice; i++) {
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289 | j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
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290 | if (key == tolower(items[(scroll + i) * 2 + 1][j]))
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291 | break;
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292 | }
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293 | }
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294 |
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295 | if (i < max_choice ||
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296 | key == KEY_UP || key == KEY_DOWN ||
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297 | key == '-' || key == '+' ||
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298 | key == KEY_PPAGE || key == KEY_NPAGE) {
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299 | /* Remove highligt of current item */
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300 | print_item(scroll + choice, choice, FALSE);
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301 |
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302 | if (key == KEY_UP || key == '-') {
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303 | if (choice < 2 && scroll) {
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304 | /* Scroll menu down */
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305 | do_scroll(menu, &scroll, -1);
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306 |
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307 | print_item(scroll, 0, FALSE);
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308 | } else
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309 | choice = MAX(choice - 1, 0);
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310 |
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311 | } else if (key == KEY_DOWN || key == '+') {
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312 | print_item(scroll+choice, choice, FALSE);
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313 |
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314 | if ((choice > max_choice - 3) &&
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315 | (scroll + max_choice < item_no)) {
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316 | /* Scroll menu up */
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317 | do_scroll(menu, &scroll, 1);
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318 |
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319 | print_item(scroll+max_choice - 1,
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320 | max_choice - 1, FALSE);
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321 | } else
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322 | choice = MIN(choice + 1, max_choice - 1);
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323 |
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324 | } else if (key == KEY_PPAGE) {
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325 | scrollok(menu, TRUE);
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326 | for (i = 0; (i < max_choice); i++) {
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327 | if (scroll > 0) {
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328 | do_scroll(menu, &scroll, -1);
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329 | print_item(scroll, 0, FALSE);
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330 | } else {
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331 | if (choice > 0)
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332 | choice--;
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333 | }
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334 | }
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335 |
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336 | } else if (key == KEY_NPAGE) {
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337 | for (i = 0; (i < max_choice); i++) {
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338 | if (scroll + max_choice < item_no) {
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339 | do_scroll(menu, &scroll, 1);
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340 | print_item(scroll+max_choice-1,
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341 | max_choice - 1, FALSE);
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342 | } else {
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343 | if (choice + 1 < max_choice)
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344 | choice++;
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345 | }
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346 | }
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347 | } else
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348 | choice = i;
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349 |
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350 | print_item(scroll + choice, choice, TRUE);
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351 |
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352 | print_arrows(dialog, item_no, scroll,
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353 | box_y, box_x + item_x + 1, menu_height);
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354 |
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355 | wnoutrefresh(dialog);
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356 | wrefresh(menu);
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357 |
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358 | continue; /* wait for another key press */
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359 | }
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360 |
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361 | switch (key) {
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362 | case KEY_LEFT:
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363 | case TAB:
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364 | case KEY_RIGHT:
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365 | button = ((key == KEY_LEFT ? --button : ++button) < 0)
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366 | ? 2 : (button > 2 ? 0 : button);
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367 |
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368 | print_buttons(dialog, height, width, button);
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369 | wrefresh(menu);
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370 | break;
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371 | case ' ':
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372 | case 's':
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373 | case 'y':
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374 | case 'n':
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375 | case 'm':
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376 | case '/':
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377 | /* save scroll info */
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378 | if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
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379 | fprintf(f, "%d\n", scroll);
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380 | fclose(f);
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381 | }
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382 | delwin(dialog);
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383 | fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
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384 | switch (key) {
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385 | case 's':
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386 | return 3;
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387 | case 'y':
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388 | return 3;
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389 | case 'n':
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390 | return 4;
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391 | case 'm':
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392 | return 5;
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393 | case ' ':
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394 | return 6;
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395 | case '/':
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396 | return 7;
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397 | }
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398 | return 0;
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399 | case 'h':
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400 | case '?':
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401 | button = 2;
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402 | case '\n':
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403 | delwin(dialog);
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404 | if (button == 2)
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405 | fprintf(stderr, "%s \"%s\"\n",
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406 | items[(scroll + choice) * 2],
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407 | items[(scroll + choice) * 2 + 1] +
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408 | first_alpha(items [(scroll + choice) * 2 + 1], ""));
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409 | else
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410 | fprintf(stderr, "%s\n",
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411 | items[(scroll + choice) * 2]);
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412 |
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413 | remove("lxdialog.scrltmp");
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414 | return button;
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415 | case 'e':
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416 | case 'x':
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417 | key = ESC;
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418 | case ESC:
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419 | break;
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420 | }
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421 | }
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422 |
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423 | delwin(dialog);
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424 | remove("lxdialog.scrltmp");
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425 | return -1; /* ESC pressed */
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426 | }
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