5 #include "mainindexes.h"
7 #include "mainsession.h"
10 #include "mwindowgui.h"
11 #include "undostackitem.h"
14 // Minimum number of undoable operations on the undo stack
15 #define UNDOMINLEVELS 5
16 // Limits the bytes of memory used by the undo stack
17 #define UNDOMEMORY 50000000
20 class MainUndoStackItem : public UndoStackItem
23 MainUndoStackItem(MainUndo* undo, char* description,
25 virtual ~MainUndoStackItem();
27 void set_data_before(char *data);
29 virtual int get_size();
32 // type of modification
33 unsigned long load_flags;
35 // data before the modification for undos
40 void load_from_undo(FileXML *file, uint32_t load_flags); // loads undo from the stringfile to the project
44 MainUndo::MainUndo(MWindow *mwindow)
46 this->mwindow = mwindow;
50 // get the initial project so we have something that the last undo reverts to
59 void MainUndo::push_undo_item(UndoStackItem *item)
62 while (redo_stack.last)
63 redo_stack.remove(redo_stack.last);
65 // move item onto undo_stack
66 undo_stack.append(item);
71 mwindow->session->changes_made = 1;
72 mwindow->gui->lock_window("MainUndo::update_undo_before");
73 mwindow->gui->mainmenu->undo->update_caption(item->description);
74 mwindow->gui->mainmenu->redo->update_caption("");
75 mwindow->gui->unlock_window();
78 void MainUndo::capture_state()
81 mwindow->edl->save_xml(mwindow->plugindb,
86 file.terminate_string();
88 data_after = new char[strlen(file.string)+1];
89 strcpy(data_after, file.string);
92 void MainUndo::update_undo_before(char *description, uint32_t load_flags)
96 new_entry = new MainUndoStackItem(this, description, load_flags);
100 void MainUndo::update_undo_after()
104 // the old data_after is the state before the change
105 new_entry->set_data_before(data_after);
107 push_undo_item(new_entry);
112 void MainUndo::push_state(char *description, uint32_t load_flags)
114 // ignore this push under certain conditions:
115 // - if nothing was undone
116 if (redo_stack.last == 0 &&
117 // - if it is not the first push
119 // - if it has the same description as the previous undo
120 strcmp(undo_stack.last->description, description) == 0 &&
121 // - if it follows closely after the previous undo
122 timestamp.get_difference() < 300 /*millisec*/)
128 MainUndoStackItem* new_entry = new MainUndoStackItem(this, description, load_flags);
129 // the old data_after is the state before the change
130 new_entry->set_data_before(data_after);
131 push_undo_item(new_entry);
133 mwindow->session->changes_made = 1;
144 UndoStackItem* current_entry = undo_stack.last;
148 // move item to redo_stack
149 undo_stack.remove_pointer(current_entry);
150 current_entry->undo();
151 redo_stack.append(current_entry);
156 mwindow->gui->mainmenu->redo->update_caption(current_entry->description);
159 mwindow->gui->mainmenu->undo->update_caption(undo_stack.last->description);
161 mwindow->gui->mainmenu->undo->update_caption("");
169 UndoStackItem* current_entry = redo_stack.last;
173 // move item to undo_stack
174 redo_stack.remove_pointer(current_entry);
175 current_entry->undo();
176 undo_stack.append(current_entry);
181 mwindow->gui->mainmenu->undo->update_caption(current_entry->description);
184 mwindow->gui->mainmenu->redo->update_caption(redo_stack.last->description);
186 mwindow->gui->mainmenu->redo->update_caption("");
192 // enforces that the undo stack does not exceed a size of UNDOMEMORY
193 // except that it always has at least UNDOMINLEVELS entries
194 void MainUndo::prune_undo()
199 UndoStackItem* i = undo_stack.last;
200 while (i != 0 && (levels < UNDOMINLEVELS || size <= UNDOMEMORY))
202 size += i->get_size();
209 // truncate everything before and including i
210 while (undo_stack.first != i)
211 undo_stack.remove(undo_stack.first);
212 undo_stack.remove(undo_stack.first);
220 MainUndoStackItem::MainUndoStackItem(MainUndo* main_undo, char* description,
224 this->load_flags = load_flags;
225 this->main_undo = main_undo;
226 set_description(description);
229 MainUndoStackItem::~MainUndoStackItem()
231 delete [] data_before;
234 void MainUndoStackItem::set_data_before(char *data)
236 data_before = new char[strlen(data) + 1];
237 strcpy(data_before, data);
240 void MainUndoStackItem::undo()
242 // move the old data_after here
243 char* before = data_before;
245 set_data_before(main_undo->data_after);
250 file.read_from_string(before);
251 load_from_undo(&file, load_flags);
254 int MainUndoStackItem::get_size()
256 return data_before ? strlen(data_before) : 0;
259 // Here the master EDL loads
260 void MainUndoStackItem::load_from_undo(FileXML *file, uint32_t load_flags)
262 MWindow* mwindow = main_undo->mwindow;
263 mwindow->edl->load_xml(mwindow->plugindb, file, load_flags);
264 for(Asset *asset = mwindow->edl->assets->first;
268 mwindow->mainindexes->add_next_asset(asset);
270 mwindow->mainindexes->start_build();