cinelerra/mainundo.C

   1 #include "asset.h"
   2 #include "assets.h"
   3 #include "edl.h"
   4 #include "filexml.h"
   5 #include "mainindexes.h"
   6 #include "mainmenu.h"
   7 #include "mainsession.h"
   8 #include "mainundo.h"
   9 #include "mwindow.h"
  10 #include "mwindowgui.h"
  11 #include "undostackitem.h"
  12 #include "tracks.h"
  13 #include <string.h>
  14
  15 // Minimum number of undoable operations on the undo stack
  16 #define UNDOMINLEVELS 5
  17 // Limits the bytes of memory used by the undo stack
  18 #define UNDOMEMORY 50000000
  19
  20
  21 class MainUndoStackItem : public UndoStackItem
  22 {
  23 public:
  24         MainUndoStackItem(MainUndo* undo, char* description,
  25                         uint32_t load_flags, void* creator);
  26         virtual ~MainUndoStackItem();
  27
  28         void set_data_before(char *data);
  29         virtual void undo();
  30         virtual int get_size();
  31
  32 private:
  33 // type of modification
  34         unsigned long load_flags;
  35
  36 // data before the modification for undos
  37         char *data_before;
  38
  39         MainUndo *main_undo;
  40
  41         void load_from_undo(FileXML *file, uint32_t load_flags);        // loads undo from the stringfile to the project
  42 };
  43
  44
  45 MainUndo::MainUndo(MWindow *mwindow)
  46 {
  47         this->mwindow = mwindow;
  48         new_entry = 0;
  49         data_after = 0;
  50         last_update = new Timer;
  51
  52 // get the initial project so we have something that the last undo reverts to
  53         capture_state();
  54 }
  55
  56 MainUndo::~MainUndo()
  57 {
  58         delete [] data_after;
  59         delete last_update;
  60 }
  61
  62 void MainUndo::update_undo(char *description, uint32_t load_flags,
  63                 void *creator, int changes_made)
  64 {
  65         if (ignore_push(description, load_flags, creator))
  66         {
  67                 capture_state();
  68                 return;
  69         }
  70
  71         MainUndoStackItem* new_entry = new MainUndoStackItem(this, description, load_flags, creator);
  72
  73 // the old data_after is the state before the change
  74         new_entry->set_data_before(data_after);
  75
  76         push_undo_item(new_entry);
  77 }
  78
  79 void MainUndo::push_undo_item(UndoStackItem *item)
  80 {
  81 // clear redo_stack
  82         while (redo_stack.last)
  83                 redo_stack.remove(redo_stack.last);
  84
  85 // move item onto undo_stack
  86         undo_stack.append(item);
  87         prune_undo();
  88
  89         capture_state();
  90
  91         mwindow->session->changes_made = 1;
  92    mwindow->gui->lock_window("MainUndo::update_undo_before");
  93    mwindow->gui->mainmenu->undo->update_caption(item->description);
  94    mwindow->gui->mainmenu->redo->update_caption("");
  95    mwindow->gui->unlock_window();
  96 }
  97
  98 void MainUndo::capture_state()
  99 {
 100         FileXML file;
 101         mwindow->edl->save_xml(mwindow->plugindb,
 102                 &file,
 103                 "",
 104                 0,
 105                 0);
 106         file.terminate_string();
 107         delete [] data_after;
 108         data_after = new char[strlen(file.string)+1];
 109         strcpy(data_after, file.string);
 110 }
 111
 112 bool MainUndo::ignore_push(char *description, uint32_t load_flags, void* creator)
 113 {
 114 // ignore this push under certain conditions:
 115 // - if nothing was undone
 116         bool ignore = redo_stack.last == 0 &&
 117 // - if it is not the first push
 118                 undo_stack.last &&
 119 // - if it has the same description as the previous undo
 120                 strcmp(undo_stack.last->description, description) == 0 &&
 121 // - if it originates from the same creator
 122                 undo_stack.last->creator == creator &&
 123 // - if it follows closely after the previous undo
 124                 last_update->get_difference() < 300 /*millisec*/;
 125         last_update->update();
 126         return ignore;
 127 }
 128
 129 void MainUndo::push_state(char *description, uint32_t load_flags, void* creator)
 130 {
 131         if (ignore_push(description, load_flags, creator))
 132         {
 133                 capture_state();
 134         }
 135         else
 136         {
 137                 MainUndoStackItem* new_entry = new MainUndoStackItem(this, description, load_flags, creator);
 138 // the old data_after is the state before the change
 139                 new_entry->set_data_before(data_after);
 140                 push_undo_item(new_entry);
 141         }
 142         mwindow->session->changes_made = 1;
 143 }
 144
 145
 146
 147
 148
 149
 150 int MainUndo::undo()
 151 {
 152         UndoStackItem* current_entry = undo_stack.last;
 153
 154         if(current_entry)
 155         {
 156 // move item to redo_stack
 157                 undo_stack.remove_pointer(current_entry);
 158                 current_entry->undo();
 159                 redo_stack.append(current_entry);
 160                 capture_state();
 161
 162                 if(mwindow->gui)
 163                 {
 164                         mwindow->gui->mainmenu->redo->update_caption(current_entry->description);
 165
 166                         if(undo_stack.last)
 167                                 mwindow->gui->mainmenu->undo->update_caption(undo_stack.last->description);
 168                         else
 169                                 mwindow->gui->mainmenu->undo->update_caption("");
 170                 }
 171         }
 172
 173         reset_creators();
 174         return 0;
 175 }
 176
 177 int MainUndo::redo()
 178 {
 179         UndoStackItem* current_entry = redo_stack.last;
 180
 181         if(current_entry)
 182         {
 183 // move item to undo_stack
 184                 redo_stack.remove_pointer(current_entry);
 185                 current_entry->undo();
 186                 undo_stack.append(current_entry);
 187                 capture_state();
 188
 189                 if(mwindow->gui)
 190                 {
 191                         mwindow->gui->mainmenu->undo->update_caption(current_entry->description);
 192
 193                         if(redo_stack.last)
 194                                 mwindow->gui->mainmenu->redo->update_caption(redo_stack.last->description);
 195                         else
 196                                 mwindow->gui->mainmenu->redo->update_caption("");
 197                 }
 198         }
 199         reset_creators();
 200         return 0;
 201 }
 202
 203 // enforces that the undo stack does not exceed a size of UNDOMEMORY
 204 // except that it always has at least UNDOMINLEVELS entries
 205 void MainUndo::prune_undo()
 206 {
 207         int size = 0;
 208         int levels = 0;
 209
 210         UndoStackItem* i = undo_stack.last;
 211         while (i != 0 && (levels < UNDOMINLEVELS || size <= UNDOMEMORY))
 212         {
 213                 size += i->get_size();
 214                 ++levels;
 215                 i = i->previous;
 216         }
 217
 218         if (i != 0)
 219         {
 220 // truncate everything before and including i
 221                 while (undo_stack.first != i)
 222                         undo_stack.remove(undo_stack.first);
 223                 undo_stack.remove(undo_stack.first);
 224         }
 225 }
 226
 227
 228
 229
 230
 231 MainUndoStackItem::MainUndoStackItem(MainUndo* main_undo, char* description,
 232                         uint32_t load_flags, void* creator)
 233 {
 234         data_before = 0;
 235         this->load_flags = load_flags;
 236         this->main_undo = main_undo;
 237         set_description(description);
 238         set_creator(creator);
 239 }
 240
 241 MainUndoStackItem::~MainUndoStackItem()
 242 {
 243         delete [] data_before;
 244 }
 245
 246 void MainUndoStackItem::set_data_before(char *data)
 247 {
 248         data_before = new char[strlen(data) + 1];
 249         strcpy(data_before, data);
 250 }
 251
 252 void MainUndoStackItem::undo()
 253 {
 254 // move the old data_after here
 255         char* before = data_before;
 256         data_before = 0;
 257         set_data_before(main_undo->data_after);
 258
 259 // undo the state
 260         FileXML file;
 261
 262         file.read_from_string(before);
 263         load_from_undo(&file, load_flags);
 264 }
 265
 266 int MainUndoStackItem::get_size()
 267 {
 268         return data_before ? strlen(data_before) : 0;
 269 }
 270
 271 // Here the master EDL loads
 272 void MainUndoStackItem::load_from_undo(FileXML *file, uint32_t load_flags)
 273 {
 274         MWindow* mwindow = main_undo->mwindow;
 275         mwindow->edl->load_xml(mwindow->plugindb, file, load_flags);
 276         for(Assets_list::iterator asset = mwindow->edl->assets->begin();
 277                 asset != mwindow->edl->assets->end();
 278                 ++asset)
 279         {
 280                 mwindow->mainindexes->add_next_asset(0, *asset);
 281         }
 282         mwindow->mainindexes->start_build();
 283 }
 284
 285
 286 void MainUndo::reset_creators()
 287 {
 288         for(UndoStackItem *current = undo_stack.first;
 289                 current;
 290                 current = NEXT)
 291         {
 292                 current->set_creator(0);
 293         }
 294 }
 295
 296
 297
 298 /*
 299 //      Local Variables:
 300 //      mode: C++
 301 //      c-file-style: "linux"
 302 //      End:
 303 */