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| 1 /* | |
| 2 * Copyright (C) 2006, 2007 Apple, Inc. All rights reserved. | |
| 3 * Copyright (C) 2012 Google, Inc. All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * | |
| 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
| 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 25 */ | |
| 26 | |
| 27 #include "config.h" | |
| 28 #include "core/editing/UndoStack.h" | |
| 29 | |
| 30 #include "core/dom/ContainerNode.h" | |
| 31 #include "core/editing/UndoStep.h" | |
| 32 #include "platform/EventDispatchForbiddenScope.h" | |
| 33 #include "wtf/TemporaryChange.h" | |
| 34 | |
| 35 namespace blink { | |
| 36 | |
| 37 // Arbitrary depth limit for the undo stack, to keep it from using | |
| 38 // unbounded memory. This is the maximum number of distinct undoable | |
| 39 // actions -- unbroken stretches of typed characters are coalesced | |
| 40 // into a single action. | |
| 41 static const size_t maximumUndoStackDepth = 1000; | |
| 42 | |
| 43 UndoStack::UndoStack() | |
| 44 : m_inRedo(false) | |
| 45 { | |
| 46 } | |
| 47 | |
| 48 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(UndoStack) | |
| 49 | |
| 50 PassOwnPtrWillBeRawPtr<UndoStack> UndoStack::create() | |
| 51 { | |
| 52 return adoptPtrWillBeNoop(new UndoStack()); | |
| 53 } | |
| 54 | |
| 55 void UndoStack::registerUndoStep(PassRefPtrWillBeRawPtr<UndoStep> step) | |
| 56 { | |
| 57 if (m_undoStack.size() == maximumUndoStackDepth) | |
| 58 m_undoStack.removeFirst(); // drop oldest item off the far end | |
| 59 if (!m_inRedo) | |
| 60 m_redoStack.clear(); | |
| 61 m_undoStack.append(step); | |
| 62 } | |
| 63 | |
| 64 void UndoStack::registerRedoStep(PassRefPtrWillBeRawPtr<UndoStep> step) | |
| 65 { | |
| 66 m_redoStack.append(step); | |
| 67 } | |
| 68 | |
| 69 void UndoStack::didUnloadFrame(const LocalFrame& frame) | |
| 70 { | |
| 71 EventDispatchForbiddenScope assertNoEventDispatch; | |
| 72 filterOutUndoSteps(m_undoStack, frame); | |
| 73 filterOutUndoSteps(m_redoStack, frame); | |
| 74 } | |
| 75 | |
| 76 void UndoStack::filterOutUndoSteps(UndoStepStack& stack, const LocalFrame& frame
) | |
| 77 { | |
| 78 UndoStepStack newStack; | |
| 79 while (!stack.isEmpty()) { | |
| 80 UndoStep* step = stack.first().get(); | |
| 81 if (!step->belongsTo(frame)) | |
| 82 newStack.append(step); | |
| 83 stack.removeFirst(); | |
| 84 } | |
| 85 stack.swap(newStack); | |
| 86 } | |
| 87 | |
| 88 bool UndoStack::canUndo() const | |
| 89 { | |
| 90 return !m_undoStack.isEmpty(); | |
| 91 } | |
| 92 | |
| 93 bool UndoStack::canRedo() const | |
| 94 { | |
| 95 return !m_redoStack.isEmpty(); | |
| 96 } | |
| 97 | |
| 98 void UndoStack::undo() | |
| 99 { | |
| 100 if (canUndo()) { | |
| 101 UndoStepStack::iterator back = --m_undoStack.end(); | |
| 102 RefPtrWillBeRawPtr<UndoStep> step(back->get()); | |
| 103 m_undoStack.remove(back); | |
| 104 step->unapply(); | |
| 105 // unapply will call us back to push this command onto the redo stack. | |
| 106 } | |
| 107 } | |
| 108 | |
| 109 void UndoStack::redo() | |
| 110 { | |
| 111 if (canRedo()) { | |
| 112 UndoStepStack::iterator back = --m_redoStack.end(); | |
| 113 RefPtrWillBeRawPtr<UndoStep> step(back->get()); | |
| 114 m_redoStack.remove(back); | |
| 115 | |
| 116 ASSERT(!m_inRedo); | |
| 117 TemporaryChange<bool> redoScope(m_inRedo, true); | |
| 118 step->reapply(); | |
| 119 // reapply will call us back to push this command onto the undo stack. | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 DEFINE_TRACE(UndoStack) | |
| 124 { | |
| 125 visitor->trace(m_undoStack); | |
| 126 visitor->trace(m_redoStack); | |
| 127 } | |
| 128 | |
| 129 } // namespace blink | |
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Chromium Code Reviews
Issue 1294543005:
Move execCommand related files in core/editing/ related files into core/editing/commands/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master