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::update_undo(char *description, uint32_t load_flags,
60 void *creator, int changes_made)
62 MainUndoStackItem* new_entry = new MainUndoStackItem(this, description, load_flags);
64 // the old data_after is the state before the change
65 new_entry->set_data_before(data_after);
67 push_undo_item(new_entry);
70 void MainUndo::push_undo_item(UndoStackItem *item)
73 while (redo_stack.last)
74 redo_stack.remove(redo_stack.last);
76 // move item onto undo_stack
77 undo_stack.append(item);
82 mwindow->session->changes_made = 1;
83 mwindow->gui->lock_window("MainUndo::update_undo_before");
84 mwindow->gui->mainmenu->undo->update_caption(item->description);
85 mwindow->gui->mainmenu->redo->update_caption("");
86 mwindow->gui->unlock_window();
89 void MainUndo::capture_state()
92 mwindow->edl->save_xml(mwindow->plugindb,
97 file.terminate_string();
99 data_after = new char[strlen(file.string)+1];
100 strcpy(data_after, file.string);
103 void MainUndo::push_state(char *description, uint32_t load_flags)
105 // ignore this push under certain conditions:
106 // - if nothing was undone
107 if (redo_stack.last == 0 &&
108 // - if it is not the first push
110 // - if it has the same description as the previous undo
111 strcmp(undo_stack.last->description, description) == 0 &&
112 // - if it follows closely after the previous undo
113 timestamp.get_difference() < 300 /*millisec*/)
119 MainUndoStackItem* new_entry = new MainUndoStackItem(this, description, load_flags);
120 // the old data_after is the state before the change
121 new_entry->set_data_before(data_after);
122 push_undo_item(new_entry);
124 mwindow->session->changes_made = 1;
135 UndoStackItem* current_entry = undo_stack.last;
139 // move item to redo_stack
140 undo_stack.remove_pointer(current_entry);
141 current_entry->undo();
142 redo_stack.append(current_entry);
147 mwindow->gui->mainmenu->redo->update_caption(current_entry->description);
150 mwindow->gui->mainmenu->undo->update_caption(undo_stack.last->description);
152 mwindow->gui->mainmenu->undo->update_caption("");
160 UndoStackItem* current_entry = redo_stack.last;
164 // move item to undo_stack
165 redo_stack.remove_pointer(current_entry);
166 current_entry->undo();
167 undo_stack.append(current_entry);
172 mwindow->gui->mainmenu->undo->update_caption(current_entry->description);
175 mwindow->gui->mainmenu->redo->update_caption(redo_stack.last->description);
177 mwindow->gui->mainmenu->redo->update_caption("");
183 // enforces that the undo stack does not exceed a size of UNDOMEMORY
184 // except that it always has at least UNDOMINLEVELS entries
185 void MainUndo::prune_undo()
190 UndoStackItem* i = undo_stack.last;
191 while (i != 0 && (levels < UNDOMINLEVELS || size <= UNDOMEMORY))
193 size += i->get_size();
200 // truncate everything before and including i
201 while (undo_stack.first != i)
202 undo_stack.remove(undo_stack.first);
203 undo_stack.remove(undo_stack.first);
211 MainUndoStackItem::MainUndoStackItem(MainUndo* main_undo, char* description,
215 this->load_flags = load_flags;
216 this->main_undo = main_undo;
217 set_description(description);
220 MainUndoStackItem::~MainUndoStackItem()
222 delete [] data_before;
225 void MainUndoStackItem::set_data_before(char *data)
227 data_before = new char[strlen(data) + 1];
228 strcpy(data_before, data);
231 void MainUndoStackItem::undo()
233 // move the old data_after here
234 char* before = data_before;
236 set_data_before(main_undo->data_after);
241 file.read_from_string(before);
242 load_from_undo(&file, load_flags);
245 int MainUndoStackItem::get_size()
247 return data_before ? strlen(data_before) : 0;
250 // Here the master EDL loads
251 void MainUndoStackItem::load_from_undo(FileXML *file, uint32_t load_flags)
253 MWindow* mwindow = main_undo->mwindow;
254 mwindow->edl->load_xml(mwindow->plugindb, file, load_flags);
255 for(Asset *asset = mwindow->edl->assets->first;
259 mwindow->mainindexes->add_next_asset(0, asset);
261 mwindow->mainindexes->start_build();