1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ |
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2 | /* This file is part of the GtkHTML library |
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3 | |
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4 | Copyright (C) 2000 Helix Code, Inc. |
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5 | |
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6 | This library is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2 of the License, or (at your option) any later version. |
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10 | |
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11 | This library is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHcANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | Library General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU Library General Public License |
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17 | along with this library; see the file COPYING.LIB. If not, write to |
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18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. |
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20 | */ |
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21 | |
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22 | #include <config.h> |
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23 | #include "htmlcursor.h" |
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24 | #include "htmlengine.h" |
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25 | #include "htmlundo.h" |
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26 | |
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27 | struct _HTMLUndoStack { |
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28 | GList *stack; |
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29 | guint size; |
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30 | }; |
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31 | typedef struct _HTMLUndoStack HTMLUndoStack; |
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32 | |
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33 | struct _HTMLUndo { |
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34 | HTMLUndoStack undo; |
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35 | HTMLUndoStack redo; |
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36 | HTMLUndoStack undo_used; |
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37 | |
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38 | /* these lists are stacks containing other |
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39 | levels undo/redo after calling html_undo_level_start */ |
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40 | GSList *undo_levels; |
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41 | GSList *redo_levels; |
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42 | guint level; |
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43 | guint in_redo; |
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44 | gint step_counter; |
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45 | }; |
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46 | |
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47 | #ifdef UNDO_DEBUG |
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48 | static void html_undo_debug (HTMLUndo *undo); |
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49 | #define DEBUG(x) html_undo_debug (x) |
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50 | #else |
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51 | #define DEBUG(x) |
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52 | #endif |
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53 | |
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54 | static void add_used_and_redo_to_undo (HTMLUndo *undo); |
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55 | |
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56 | inline static void |
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57 | stack_copy (HTMLUndoStack *src, HTMLUndoStack *dst) |
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58 | { |
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59 | dst->stack = src->stack; |
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60 | dst->size = src->size; |
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61 | } |
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62 | |
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63 | inline static void |
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64 | stack_dup (HTMLUndoStack *src, HTMLUndoStack *dst) |
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65 | { |
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66 | dst->stack = g_list_copy (src->stack); |
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67 | dst->size = src->size; |
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68 | } |
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69 | |
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70 | static void |
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71 | destroy_action_list (GList *lp) |
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72 | { |
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73 | GList *p; |
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74 | |
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75 | for (p = lp; p != NULL; p = p->next) |
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76 | html_undo_action_destroy ((HTMLUndoAction *) p->data); |
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77 | } |
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78 | |
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79 | |
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80 | HTMLUndo * |
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81 | html_undo_new (void) |
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82 | { |
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83 | HTMLUndo *new_undo; |
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84 | |
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85 | new_undo = g_new0 (HTMLUndo, 1); |
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86 | |
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87 | return new_undo; |
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88 | } |
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89 | |
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90 | void |
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91 | html_undo_destroy (HTMLUndo *undo) |
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92 | { |
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93 | g_return_if_fail (undo != NULL); |
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94 | |
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95 | destroy_action_list (undo->undo.stack); |
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96 | destroy_action_list (undo->undo_used.stack); |
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97 | destroy_action_list (undo->redo.stack); |
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98 | |
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99 | g_free (undo); |
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100 | } |
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101 | |
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102 | |
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103 | static void |
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104 | action_do_and_destroy_redo (HTMLEngine *engine, HTMLUndo *undo, GList **stack, HTMLUndoDirection dir) |
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105 | { |
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106 | HTMLUndoAction *action; |
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107 | GList *first; |
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108 | |
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109 | first = *stack; |
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110 | action = HTML_UNDO_ACTION (first->data); |
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111 | |
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112 | html_cursor_jump_to_position (engine->cursor, engine, action->position); |
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113 | (* action->function) (engine, action->data, dir, action->position_after); |
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114 | html_cursor_jump_to_position (engine->cursor, engine, action->position_after); |
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115 | |
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116 | *stack = g_list_remove (first, first->data); |
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117 | if (undo->level == 0) { |
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118 | html_undo_action_destroy (action); |
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119 | |
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120 | first = undo->undo_used.stack; |
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121 | html_undo_action_destroy (HTML_UNDO_ACTION (first->data)); |
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122 | undo->undo_used.stack = g_list_remove (first, first->data); |
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123 | } |
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124 | } |
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125 | |
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126 | static void |
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127 | action_do_and_destroy_undo (HTMLEngine *engine, HTMLUndo *undo, HTMLUndoDirection dir) |
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128 | { |
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129 | HTMLUndoAction *action; |
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130 | GList *first; |
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131 | |
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132 | first = undo->undo.stack; |
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133 | action = HTML_UNDO_ACTION (first->data); |
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134 | |
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135 | html_cursor_jump_to_position (engine->cursor, engine, action->position); |
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136 | (* action->function) (engine, action->data, dir, action->position_after); |
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137 | html_cursor_jump_to_position (engine->cursor, engine, action->position_after); |
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138 | |
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139 | undo->undo.stack = g_list_remove (first, first->data); |
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140 | if (undo->level == 0) { |
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141 | undo->undo_used.stack = g_list_prepend (undo->undo_used.stack, action); |
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142 | undo->step_counter --; |
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143 | } |
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144 | } |
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145 | |
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146 | void |
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147 | html_undo_do_undo (HTMLUndo *undo, |
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148 | HTMLEngine *engine) |
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149 | { |
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150 | g_return_if_fail (undo != NULL); |
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151 | g_return_if_fail (engine != NULL); |
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152 | |
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153 | if (undo->undo.size > 0) { |
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154 | #ifdef UNDO_DEBUG |
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155 | if (!undo->level) { |
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156 | printf ("UNDO begin\n"); |
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157 | DEBUG (undo); |
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158 | } |
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159 | #endif |
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160 | engine->block_events ++; |
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161 | action_do_and_destroy_undo (engine, undo, HTML_UNDO_UNDO); |
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162 | undo->undo.size--; |
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163 | engine->block_events --; |
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164 | #ifdef UNDO_DEBUG |
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165 | if (!undo->level) { |
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166 | DEBUG (undo); |
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167 | printf ("UNDO end\n"); |
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168 | } |
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169 | #endif |
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170 | } |
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171 | } |
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172 | |
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173 | void |
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174 | html_undo_do_redo (HTMLUndo *undo, |
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175 | HTMLEngine *engine) |
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176 | { |
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177 | g_return_if_fail (undo != NULL); |
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178 | g_return_if_fail (engine != NULL); |
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179 | |
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180 | if (undo->redo.size > 0) { |
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181 | #ifdef UNDO_DEBUG |
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182 | if (!undo->level) { |
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183 | printf ("REDO begin\n"); |
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184 | DEBUG (undo); |
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185 | } |
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186 | #endif |
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187 | undo->in_redo ++; |
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188 | engine->block_events ++; |
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189 | action_do_and_destroy_redo (engine, undo, &undo->redo.stack, HTML_UNDO_REDO); |
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190 | undo->redo.size--; |
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191 | engine->block_events --; |
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192 | undo->in_redo --; |
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193 | |
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194 | #ifdef UNDO_DEBUG |
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195 | if (!undo->level) { |
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196 | DEBUG (undo); |
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197 | printf ("REDO end\n"); |
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198 | } |
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199 | #endif |
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200 | } |
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201 | } |
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202 | |
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203 | |
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204 | void |
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205 | html_undo_discard_redo (HTMLUndo *undo) |
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206 | { |
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207 | g_return_if_fail (undo != NULL); |
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208 | |
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209 | if (undo->redo.stack == NULL) |
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210 | return; |
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211 | |
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212 | destroy_action_list (undo->redo.stack); |
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213 | |
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214 | undo->redo.stack = NULL; |
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215 | undo->redo.size = 0; |
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216 | } |
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217 | |
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218 | void |
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219 | html_undo_add_undo_action (HTMLUndo *undo, HTMLUndoAction *action) |
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220 | { |
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221 | g_return_if_fail (undo != NULL); |
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222 | g_return_if_fail (action != NULL); |
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223 | |
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224 | if (undo->level == 0) { |
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225 | if (undo->in_redo == 0 && undo->redo.size > 0) |
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226 | add_used_and_redo_to_undo (undo); |
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227 | |
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228 | if (undo->undo.size >= HTML_UNDO_LIMIT) { |
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229 | HTMLUndoAction *last_action; |
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230 | GList *last; |
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231 | |
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232 | last = g_list_last (undo->undo.stack); |
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233 | last_action = (HTMLUndoAction *) last->data; |
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234 | |
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235 | undo->undo.stack = g_list_remove_link (undo->undo.stack, last); |
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236 | g_list_free (last); |
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237 | |
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238 | html_undo_action_destroy (last_action); |
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239 | |
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240 | undo->undo.size--; |
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241 | } |
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242 | |
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243 | undo->step_counter ++; |
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244 | } |
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245 | |
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246 | undo->undo.stack = g_list_prepend (undo->undo.stack, action); |
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247 | undo->undo.size ++; |
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248 | |
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249 | #ifdef UNDO_DEBUG |
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250 | if (!undo->level) { |
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251 | printf ("ADD UNDO\n"); |
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252 | DEBUG (undo); |
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253 | } |
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254 | #endif |
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255 | } |
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256 | |
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257 | void |
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258 | html_undo_add_redo_action (HTMLUndo *undo, |
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259 | HTMLUndoAction *action) |
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260 | { |
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261 | g_return_if_fail (undo != NULL); |
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262 | g_return_if_fail (action != NULL); |
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263 | |
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264 | undo->redo.stack = g_list_prepend (undo->redo.stack, action); |
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265 | undo->redo.size ++; |
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266 | } |
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267 | |
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268 | void |
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269 | html_undo_add_action (HTMLUndo *undo, HTMLUndoAction *action, HTMLUndoDirection dir) |
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270 | { |
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271 | if (dir == HTML_UNDO_UNDO) |
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272 | html_undo_add_undo_action (undo, action); |
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273 | else |
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274 | html_undo_add_redo_action (undo, action); |
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275 | } |
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276 | |
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277 | /* |
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278 | undo levels |
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279 | |
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280 | * IDEA: it closes number of undo steps into one |
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281 | * examples: paste |
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282 | - it first cuts active selection and then inserts objects |
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283 | from cut_buffer on actual cursor position |
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284 | - if you don't use udo levels, it will generate two undo steps/actions |
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285 | replace |
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286 | - replace uses paste operation, so when it replaces N occurences, |
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287 | it generates 2*N steps (without using undo levels in paste and replace) |
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288 | |
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289 | * usage is simple - just call html_undo_level_begin before using functions with undo |
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290 | and html_undo_level_end after them |
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291 | |
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292 | */ |
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293 | |
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294 | #define HTML_UNDO_LEVEL(x) ((HTMLUndoLevel *) x) |
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295 | struct _HTMLUndoLevel { |
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296 | HTMLUndoData data; |
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297 | |
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298 | HTMLUndo *parent_undo; |
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299 | HTMLUndoStack stack; |
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300 | |
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301 | gchar *description [HTML_UNDO_END]; |
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302 | }; |
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303 | typedef struct _HTMLUndoLevel HTMLUndoLevel; |
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304 | |
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305 | static void undo_step_action (HTMLEngine *e, HTMLUndoData *data, HTMLUndoDirection dir, guint position_after); |
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306 | static void redo_level_begin (HTMLUndo *undo, const gchar *redo_desription, const gchar *undo_desription); |
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307 | static void redo_level_end (HTMLUndo *undo); |
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308 | |
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309 | static void |
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310 | level_destroy (HTMLUndoData *data) |
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311 | { |
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312 | HTMLUndoLevel *level; |
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313 | |
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314 | g_assert (data); |
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315 | |
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316 | level = HTML_UNDO_LEVEL (data); |
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317 | |
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318 | for (; level->stack.stack; level->stack.stack = level->stack.stack->next) |
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319 | html_undo_action_destroy (HTML_UNDO_ACTION (level->stack.stack->data)); |
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320 | |
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321 | g_free (level->description [HTML_UNDO_UNDO]); |
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322 | g_free (level->description [HTML_UNDO_REDO]); |
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323 | } |
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324 | |
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325 | static HTMLUndoLevel * |
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326 | level_new (HTMLUndo *undo, HTMLUndoStack *stack, const gchar *undo_description, const gchar *redo_description) |
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327 | { |
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328 | HTMLUndoLevel *nl = g_new (HTMLUndoLevel, 1); |
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329 | |
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330 | html_undo_data_init (HTML_UNDO_DATA (nl)); |
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331 | |
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332 | stack_copy (stack, &nl->stack); |
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333 | |
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334 | nl->data.destroy = level_destroy; |
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335 | nl->parent_undo = undo; |
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336 | nl->description [HTML_UNDO_UNDO] = g_strdup (undo_description); |
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337 | nl->description [HTML_UNDO_REDO] = g_strdup (redo_description); |
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338 | |
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339 | return nl; |
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340 | } |
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341 | |
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342 | void |
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343 | html_undo_level_begin (HTMLUndo *undo, const gchar *undo_desription, const gchar *redo_desription) |
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344 | { |
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345 | undo->undo_levels = g_slist_prepend (undo->undo_levels, level_new (undo, &undo->undo, |
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346 | undo_desription, redo_desription)); |
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347 | undo->undo.stack = NULL; |
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348 | undo->undo.size = 0; |
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349 | |
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350 | undo->level ++; |
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351 | } |
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352 | |
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353 | static void |
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354 | redo_level_begin (HTMLUndo *undo, const gchar *redo_desription, const gchar *undo_desription) |
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355 | { |
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356 | undo->redo_levels = g_slist_prepend (undo->redo_levels, level_new (undo, &undo->redo, |
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357 | undo_desription, redo_desription)); |
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358 | undo->redo.stack = NULL; |
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359 | undo->redo.size = 0; |
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360 | |
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361 | undo->level ++; |
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362 | } |
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363 | |
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364 | static void |
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365 | redo_level_end (HTMLUndo *undo) |
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366 | { |
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367 | HTMLUndoLevel *level; |
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368 | HTMLUndoStack save_redo; |
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369 | GSList *head; |
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370 | |
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371 | g_assert (undo->redo_levels); |
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372 | |
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373 | undo->level --; |
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374 | |
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375 | /* preserve current redo stack */ |
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376 | stack_copy (&undo->redo, &save_redo); |
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377 | |
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378 | /* restore last level from levels stack */ |
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379 | level = HTML_UNDO_LEVEL (undo->redo_levels->data); |
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380 | stack_copy (&level->stack, &undo->redo); |
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381 | |
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382 | /* fill level with current redo step */ |
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383 | stack_copy (&save_redo, &level->stack); |
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384 | |
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385 | /* add redo step redo action */ |
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386 | if (save_redo.size) { |
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387 | HTMLUndoAction *action; |
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388 | |
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389 | /* we use position from last redo action on the stack */ |
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390 | action = (HTMLUndoAction *) save_redo.stack->data; |
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391 | html_undo_add_redo_action (undo, action = html_undo_action_new (level->description [HTML_UNDO_REDO], |
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392 | undo_step_action, |
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393 | HTML_UNDO_DATA (level), |
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394 | action->position, action->position_after)); |
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395 | #ifdef UNDO_DEBUG |
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396 | action->is_level = TRUE; |
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397 | #endif |
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398 | } else |
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399 | html_undo_data_unref (HTML_UNDO_DATA (level)); |
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400 | |
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401 | head = undo->redo_levels; |
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402 | undo->redo_levels = g_slist_remove_link (undo->redo_levels, head); |
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403 | g_slist_free (head); |
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404 | } |
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405 | |
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406 | void |
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407 | html_undo_level_end (HTMLUndo *undo) |
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408 | { |
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409 | HTMLUndoLevel *level; |
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410 | HTMLUndoStack save_undo; |
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411 | GSList *head; |
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412 | |
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413 | g_assert (undo->undo_levels); |
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414 | g_assert (undo->level); |
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415 | |
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416 | undo->level--; |
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417 | |
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418 | /* preserve current redo stack */ |
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419 | stack_copy (&undo->undo, &save_undo); |
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420 | |
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421 | /* restore last level from levels stack */ |
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422 | level = HTML_UNDO_LEVEL (undo->undo_levels->data); |
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423 | stack_copy (&level->stack, &undo->undo); |
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424 | |
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425 | /* fill level with current undo step */ |
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426 | stack_copy (&save_undo, &level->stack); |
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427 | |
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428 | /* add undo step undo action */ |
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429 | if (save_undo.size) { |
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430 | HTMLUndoAction *action; |
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431 | |
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432 | |
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433 | /* we use position from last undo action on the stack */ |
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434 | action = html_undo_action_new (level->description [HTML_UNDO_UNDO], |
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435 | undo_step_action, |
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436 | HTML_UNDO_DATA (level), |
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437 | HTML_UNDO_ACTION (save_undo.stack->data)->position, |
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438 | HTML_UNDO_ACTION (save_undo.stack->data)->position_after); |
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439 | #ifdef UNDO_DEBUG |
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440 | action->is_level = TRUE; |
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441 | #endif |
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442 | html_undo_add_undo_action (undo, action); |
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443 | } else |
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444 | html_undo_data_unref (HTML_UNDO_DATA (level)); |
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445 | |
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446 | head = undo->undo_levels; |
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447 | undo->undo_levels = g_slist_remove_link (undo->undo_levels, head); |
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448 | g_slist_free (head); |
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449 | } |
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450 | |
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451 | static void |
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452 | undo_step_action (HTMLEngine *e, HTMLUndoData *data, HTMLUndoDirection dir, guint position_after) |
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453 | { |
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454 | HTMLUndo *undo; |
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455 | HTMLUndoLevel *level; |
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456 | HTMLUndoStack save; |
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457 | HTMLUndoStack *stack; |
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458 | |
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459 | level = HTML_UNDO_LEVEL (data); |
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460 | undo = level->parent_undo; |
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461 | stack = dir == HTML_UNDO_UNDO ? &undo->undo : &undo->redo; |
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462 | |
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463 | /* prepare undo/redo step */ |
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464 | if (dir == HTML_UNDO_UNDO) |
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465 | redo_level_begin (undo, level->description [HTML_UNDO_REDO], level->description [HTML_UNDO_UNDO]); |
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466 | else |
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467 | html_undo_level_begin (undo, level->description [HTML_UNDO_UNDO], level->description [HTML_UNDO_REDO]); |
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468 | |
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469 | /* preserve current undo/redo stack */ |
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470 | stack_copy (stack, &save); |
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471 | |
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472 | /* set this level */ |
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473 | stack_dup (&level->stack, stack); |
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474 | |
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475 | undo->level ++; |
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476 | if (dir == HTML_UNDO_UNDO) |
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477 | while (undo->undo.size) |
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478 | html_undo_do_undo (undo, e); |
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479 | else |
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480 | while (undo->redo.size) |
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481 | html_undo_do_redo (undo, e); |
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482 | undo->level --; |
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483 | |
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484 | /* restore current undo/redo stack */ |
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485 | stack_copy (&save, stack); |
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486 | |
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487 | /* end redo/undo step */ |
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488 | if (dir == HTML_UNDO_UNDO) |
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489 | redo_level_end (undo); |
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490 | else |
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491 | html_undo_level_end (undo); |
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492 | } |
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493 | |
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494 | void |
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495 | html_undo_data_init (HTMLUndoData *data) |
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496 | { |
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497 | data->ref_count = 1; |
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498 | data->destroy = NULL; |
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499 | } |
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500 | |
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501 | void |
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502 | html_undo_data_ref (HTMLUndoData *data) |
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503 | { |
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504 | g_assert (data); |
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505 | |
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506 | data->ref_count ++; |
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507 | } |
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508 | |
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509 | void |
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510 | html_undo_data_unref (HTMLUndoData *data) |
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511 | { |
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512 | g_assert (data); |
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513 | g_assert (data->ref_count > 0); |
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514 | |
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515 | data->ref_count --; |
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516 | |
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517 | if (data->ref_count == 0) { |
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518 | if (data->destroy) |
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519 | (*data->destroy) (data); |
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520 | g_free (data); |
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521 | } |
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522 | } |
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523 | |
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524 | HTMLUndoDirection |
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525 | html_undo_direction_reverse (HTMLUndoDirection dir) |
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526 | { |
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527 | return dir == HTML_UNDO_UNDO ? HTML_UNDO_REDO : HTML_UNDO_UNDO; |
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528 | } |
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529 | |
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530 | static void |
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531 | add_used_and_redo_to_undo (HTMLUndo *undo) |
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532 | { |
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533 | GList *stack; |
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534 | GList *cur; |
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535 | |
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536 | stack = g_list_reverse (undo->redo.stack); |
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537 | undo->redo.stack = NULL; |
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538 | undo->redo.size = 0; |
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539 | |
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540 | /* add undo_used */ |
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541 | for (cur = undo->undo_used.stack; cur; cur = cur->next) |
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542 | html_undo_add_undo_action (undo, HTML_UNDO_ACTION (cur->data)); |
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543 | g_list_free (undo->undo_used.stack); |
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544 | undo->undo_used.stack = NULL; |
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545 | |
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546 | for (cur = stack; cur; cur = cur->next) |
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547 | html_undo_add_undo_action (undo, HTML_UNDO_ACTION (cur->data)); |
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548 | g_list_free (stack); |
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549 | |
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550 | #ifdef UNDO_DEBUG |
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551 | printf ("REVERSED\n"); |
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552 | DEBUG (undo); |
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553 | #endif |
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554 | } |
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555 | |
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556 | #ifdef UNDO_DEBUG |
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557 | |
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558 | static void |
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559 | print_stack (GList *stack, guint size, gint l) |
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560 | { |
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561 | gint i; |
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562 | |
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563 | for (; stack; stack = stack->next) { |
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564 | HTMLUndoAction *action; |
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565 | for (i = 0; i < l; i++) printf (" "); |
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566 | action = HTML_UNDO_ACTION (stack->data); |
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567 | printf ("%s\n", action->description); |
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568 | if (action->is_level) { |
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569 | HTMLUndoLevel *level; |
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570 | |
---|
571 | level = (HTMLUndoLevel *) action->data; |
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572 | |
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573 | print_stack (level->stack.stack, level->stack.size, l + 1); |
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574 | } |
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575 | } |
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576 | } |
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577 | |
---|
578 | static void |
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579 | html_undo_debug (HTMLUndo *undo) |
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580 | { |
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581 | printf ("Undo stack (%d):\n", undo->undo.size); |
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582 | print_stack (undo->undo.stack, undo->undo.size, 1); |
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583 | printf ("Redo stack (%d):\n", undo->redo.size); |
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584 | print_stack (undo->redo.stack, undo->redo.size, 1); |
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585 | printf ("Used stack (%d):\n", undo->undo_used.size); |
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586 | print_stack (undo->undo_used.stack, undo->undo_used.size, 1); |
---|
587 | printf ("--\n"); |
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588 | } |
---|
589 | |
---|
590 | #endif |
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591 | |
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592 | void |
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593 | html_undo_reset (HTMLUndo *undo) |
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594 | { |
---|
595 | g_return_if_fail (undo != NULL); |
---|
596 | g_return_if_fail (undo->level == 0); |
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597 | |
---|
598 | destroy_action_list (undo->undo.stack); |
---|
599 | destroy_action_list (undo->undo_used.stack); |
---|
600 | destroy_action_list (undo->redo.stack); |
---|
601 | |
---|
602 | undo->undo.stack = NULL; |
---|
603 | undo->undo.size = 0; |
---|
604 | undo->undo_used.stack = NULL; |
---|
605 | undo->undo_used.size = 0; |
---|
606 | undo->redo.stack = NULL; |
---|
607 | undo->redo.size = 0; |
---|
608 | |
---|
609 | undo->step_counter = 0; |
---|
610 | } |
---|
611 | |
---|
612 | gboolean |
---|
613 | html_undo_has_undo_steps (HTMLUndo *undo) |
---|
614 | { |
---|
615 | g_assert (undo->step_counter >= 0); |
---|
616 | |
---|
617 | return undo->step_counter > 0; |
---|
618 | } |
---|
619 | |
---|
620 | gint |
---|
621 | html_undo_get_step_count (HTMLUndo *undo) |
---|
622 | { |
---|
623 | return undo->step_counter; |
---|
624 | } |
---|