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juce_UndoManager.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 By using JUCE, you agree to the terms of both the JUCE 5 End-User License
11 Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
12 27th April 2017).
13
14 End User License Agreement: www.juce.com/juce-5-licence
15 Privacy Policy: www.juce.com/juce-5-privacy-policy
16
17 Or: You may also use this code under the terms of the GPL v3 (see
18 www.gnu.org/licenses).
19
20 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
21 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
22 DISCLAIMED.
23
24 ==============================================================================
25*/
26
27 namespace juce
28{
29
30//==============================================================================
52 class JUCE_API UndoManager : public ChangeBroadcaster
53{
54 public:
55 //==============================================================================
69 UndoManager (int maxNumberOfUnitsToKeep = 30000,
70 int minimumTransactionsToKeep = 30);
71
73 ~UndoManager() override;
74
75 //==============================================================================
77 void clearUndoHistory();
78
82 int getNumberOfUnitsTakenUpByStoredCommands() const;
83
98 void setMaxNumberOfStoredUnits (int maxNumberOfUnitsToKeep,
99 int minimumTransactionsToKeep);
100
101 //==============================================================================
109 bool perform (UndoableAction* action);
110
121 bool perform (UndoableAction* action, const String& actionName);
122
129 void beginNewTransaction();
130
140 void beginNewTransaction (const String& actionName);
141
148 void setCurrentTransactionName (const String& newName);
149
153 String getCurrentTransactionName() const;
154
155 //==============================================================================
159 bool canUndo() const;
160
166 bool undo();
167
181 bool undoCurrentTransactionOnly();
182
186 String getUndoDescription() const;
187
193 StringArray getUndoDescriptions() const;
194
198 Time getTimeOfUndoTransaction() const;
199
208 void getActionsInCurrentTransaction (Array<const UndoableAction*>& actionsFound) const;
209
214 int getNumActionsInCurrentTransaction() const;
215
216 //==============================================================================
220 bool canRedo() const;
221
226 bool redo();
227
231 String getRedoDescription() const;
232
238 StringArray getRedoDescriptions() const;
239
244 Time getTimeOfRedoTransaction() const;
245
247 bool isPerformingUndoRedo() const;
248
249 private:
250 //==============================================================================
251 struct ActionSet;
252 OwnedArray<ActionSet> transactions, stashedFutureTransactions;
253 String newTransactionName;
254 int totalUnitsStored = 0, maxNumUnitsToKeep = 0, minimumTransactionsToKeep = 0, nextIndex = 0;
255 bool newTransaction = true, isInsideUndoRedoCall = false;
256 ActionSet* getCurrentSet() const;
257 ActionSet* getNextSet() const;
258 void moveFutureTransactionsToStash();
259 void restoreStashedFutureTransactions();
260 void dropOldTransactionsIfTooLarge();
261
262 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (UndoManager)
263};
264
265} // namespace juce
juce::Array
Definition: juce_Array.h:56
juce::ChangeBroadcaster
Definition: juce_ChangeBroadcaster.h:35
juce::OwnedArray
Definition: juce_OwnedArray.h:51
juce::StringArray
Definition: juce_StringArray.h:35
juce::String
Definition: juce_String.h:39
juce::Time
Definition: juce_Time.h:37
juce::UndoManager
Definition: juce_UndoManager.h:53
juce::UndoableAction
Definition: juce_UndoableAction.h:40