DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (d38398e5144e)

VCS Links

AutoInsertContainerSelNotify

AutoMoveNodeSelNotify

AutoRemoveContainerSelNotify

AutoReplaceContainerSelNotify

AutoTrackDOMPoint

RangeItem

RangeUpdater

SelectionState

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_SelectionState_h
#define mozilla_SelectionState_h

#include "nsCOMPtr.h"
#include "nsIDOMNode.h"
#include "nsINode.h"
#include "nsTArray.h"
#include "nscore.h"

class nsCycleCollectionTraversalCallback;
class nsIDOMCharacterData;
class nsRange;
namespace mozilla {
class RangeUpdater;
namespace dom {
class Selection;
class Text;
} // namespace dom

/**
 * A helper struct for saving/setting ranges.
 */
struct RangeItem final
{
  RangeItem();

private:
  // Private destructor, to discourage deletion outside of Release():
  ~RangeItem();

public:
  void StoreRange(nsRange* aRange);
  already_AddRefed<nsRange> GetRange();

  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(RangeItem)
  NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(RangeItem)

  nsCOMPtr<nsINode> startNode;
  int32_t startOffset;
  nsCOMPtr<nsINode> endNode;
  int32_t endOffset;
};

/**
 * mozilla::SelectionState
 *
 * Class for recording selection info.  Stores selection as collection of
 * { {startnode, startoffset} , {endnode, endoffset} } tuples.  Can't store
 * ranges since dom gravity will possibly change the ranges.
 */

class SelectionState final
{
public:
  SelectionState();
  ~SelectionState();

  void SaveSelection(dom::Selection *aSel);
  nsresult RestoreSelection(dom::Selection* aSel);
  bool IsCollapsed();
  bool IsEqual(SelectionState *aSelState);
  void MakeEmpty();
  bool IsEmpty();
private:
  nsTArray<RefPtr<RangeItem>> mArray;

  friend class RangeUpdater;
  friend void ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback&,
                                          SelectionState&,
                                          const char*,
                                          uint32_t);
  friend void ImplCycleCollectionUnlink(SelectionState&);
};

inline void
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
                            SelectionState& aField,
                            const char* aName,
                            uint32_t aFlags = 0)
{
  ImplCycleCollectionTraverse(aCallback, aField.mArray, aName, aFlags);
}

inline void
ImplCycleCollectionUnlink(SelectionState& aField)
{
  ImplCycleCollectionUnlink(aField.mArray);
}

class RangeUpdater final
{
public:
  RangeUpdater();
  ~RangeUpdater();

  void RegisterRangeItem(RangeItem* aRangeItem);
  void DropRangeItem(RangeItem* aRangeItem);
  nsresult RegisterSelectionState(SelectionState& aSelState);
  nsresult DropSelectionState(SelectionState& aSelState);

  // editor selection gravity routines.  Note that we can't always depend on
  // DOM Range gravity to do what we want to the "real" selection.  For instance,
  // if you move a node, that corresponds to deleting it and reinserting it.
  // DOM Range gravity will promote the selection out of the node on deletion,
  // which is not what you want if you know you are reinserting it.
  nsresult SelAdjCreateNode(nsINode* aParent, int32_t aPosition);
  nsresult SelAdjCreateNode(nsIDOMNode* aParent, int32_t aPosition);
  nsresult SelAdjInsertNode(nsINode* aParent, int32_t aPosition);
  nsresult SelAdjInsertNode(nsIDOMNode* aParent, int32_t aPosition);
  void SelAdjDeleteNode(nsINode* aNode);
  void SelAdjDeleteNode(nsIDOMNode* aNode);
  nsresult SelAdjSplitNode(nsIContent& aOldRightNode, int32_t aOffset,
                           nsIContent* aNewLeftNode);
  nsresult SelAdjJoinNodes(nsINode& aLeftNode,
                           nsINode& aRightNode,
                           nsINode& aParent,
                           int32_t aOffset,
                           int32_t aOldLeftNodeLength);
  void SelAdjInsertText(dom::Text& aTextNode, int32_t aOffset,
                        const nsAString &aString);
  nsresult SelAdjDeleteText(nsIContent* aTextNode, int32_t aOffset,
                            int32_t aLength);
  nsresult SelAdjDeleteText(nsIDOMCharacterData* aTextNode,
                            int32_t aOffset, int32_t aLength);
  // the following gravity routines need will/did sandwiches, because the other
  // gravity routines will be called inside of these sandwiches, but should be
  // ignored.
  nsresult WillReplaceContainer();
  nsresult DidReplaceContainer(dom::Element* aOriginalNode,
                               dom::Element* aNewNode);
  nsresult WillRemoveContainer();
  nsresult DidRemoveContainer(nsINode* aNode, nsINode* aParent,
                              int32_t aOffset, uint32_t aNodeOrigLen);
  nsresult DidRemoveContainer(nsIDOMNode* aNode, nsIDOMNode* aParent,
                              int32_t aOffset, uint32_t aNodeOrigLen);
  nsresult WillInsertContainer();
  nsresult DidInsertContainer();
  void WillMoveNode();
  void DidMoveNode(nsINode* aOldParent, int32_t aOldOffset,
                   nsINode* aNewParent, int32_t aNewOffset);

private:
  friend void ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback&,
                                          RangeUpdater&,
                                          const char*,
                                          uint32_t);
  friend void ImplCycleCollectionUnlink(RangeUpdater& aField);

  nsTArray<RefPtr<RangeItem>> mArray;
  bool mLock;
};

inline void
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
                            RangeUpdater& aField,
                            const char* aName,
                            uint32_t aFlags = 0)
{
  ImplCycleCollectionTraverse(aCallback, aField.mArray, aName, aFlags);
}

inline void
ImplCycleCollectionUnlink(RangeUpdater& aField)
{
  ImplCycleCollectionUnlink(aField.mArray);
}

/**
 * Helper class for using SelectionState.  Stack based class for doing
 * preservation of dom points across editor actions.
 */

class MOZ_STACK_CLASS AutoTrackDOMPoint final
{
private:
  RangeUpdater& mRangeUpdater;
  // Allow tracking either nsIDOMNode or nsINode until nsIDOMNode is gone
  nsCOMPtr<nsINode>* mNode;
  nsCOMPtr<nsIDOMNode>* mDOMNode;
  int32_t* mOffset;
  RefPtr<RangeItem> mRangeItem;

public:
  AutoTrackDOMPoint(RangeUpdater& aRangeUpdater,
                    nsCOMPtr<nsINode>* aNode, int32_t* aOffset)
    : mRangeUpdater(aRangeUpdater)
    , mNode(aNode)
    , mDOMNode(nullptr)
    , mOffset(aOffset)
  {
    mRangeItem = new RangeItem();
    mRangeItem->startNode = *mNode;
    mRangeItem->endNode = *mNode;
    mRangeItem->startOffset = *mOffset;
    mRangeItem->endOffset = *mOffset;
    mRangeUpdater.RegisterRangeItem(mRangeItem);
  }

  AutoTrackDOMPoint(RangeUpdater& aRangeUpdater,
                    nsCOMPtr<nsIDOMNode>* aNode, int32_t* aOffset)
    : mRangeUpdater(aRangeUpdater)
    , mNode(nullptr)
    , mDOMNode(aNode)
    , mOffset(aOffset)
  {
    mRangeItem = new RangeItem();
    mRangeItem->startNode = do_QueryInterface(*mDOMNode);
    mRangeItem->endNode = do_QueryInterface(*mDOMNode);
    mRangeItem->startOffset = *mOffset;
    mRangeItem->endOffset = *mOffset;
    mRangeUpdater.RegisterRangeItem(mRangeItem);
  }

  ~AutoTrackDOMPoint()
  {
    mRangeUpdater.DropRangeItem(mRangeItem);
    if (mNode) {
      *mNode = mRangeItem->startNode;
    } else {
      *mDOMNode = GetAsDOMNode(mRangeItem->startNode);
    }
    *mOffset = mRangeItem->startOffset;
  }
};

/**
 * Another helper class for SelectionState.  Stack based class for doing
 * Will/DidReplaceContainer()
 */

class MOZ_STACK_CLASS AutoReplaceContainerSelNotify final
{
private:
  RangeUpdater& mRangeUpdater;
  dom::Element* mOriginalElement;
  dom::Element* mNewElement;

public:
  AutoReplaceContainerSelNotify(RangeUpdater& aRangeUpdater,
                                dom::Element* aOriginalElement,
                                dom::Element* aNewElement)
    : mRangeUpdater(aRangeUpdater)
    , mOriginalElement(aOriginalElement)
    , mNewElement(aNewElement)
  {
    mRangeUpdater.WillReplaceContainer();
  }

  ~AutoReplaceContainerSelNotify()
  {
    mRangeUpdater.DidReplaceContainer(mOriginalElement, mNewElement);
  }
};

/**
 * Another helper class for SelectionState.  Stack based class for doing
 * Will/DidRemoveContainer()
 */

class MOZ_STACK_CLASS AutoRemoveContainerSelNotify final
{
private:
  RangeUpdater& mRangeUpdater;
  nsIDOMNode* mNode;
  nsIDOMNode* mParent;
  int32_t mOffset;
  uint32_t mNodeOrigLen;

public:
  AutoRemoveContainerSelNotify(RangeUpdater& aRangeUpdater,
                               nsINode* aNode,
                               nsINode* aParent,
                               int32_t aOffset,
                               uint32_t aNodeOrigLen)
    : mRangeUpdater(aRangeUpdater)
    , mNode(aNode->AsDOMNode())
    , mParent(aParent->AsDOMNode())
    , mOffset(aOffset)
    , mNodeOrigLen(aNodeOrigLen)
  {
    mRangeUpdater.WillRemoveContainer();
  }

  ~AutoRemoveContainerSelNotify()
  {
    mRangeUpdater.DidRemoveContainer(mNode, mParent, mOffset, mNodeOrigLen);
  }
};

/**
 * Another helper class for SelectionState.  Stack based class for doing
 * Will/DidInsertContainer()
 */

class MOZ_STACK_CLASS AutoInsertContainerSelNotify final
{
private:
  RangeUpdater& mRangeUpdater;

public:
  explicit AutoInsertContainerSelNotify(RangeUpdater& aRangeUpdater)
    : mRangeUpdater(aRangeUpdater)
  {
    mRangeUpdater.WillInsertContainer();
  }

  ~AutoInsertContainerSelNotify()
  {
    mRangeUpdater.DidInsertContainer();
  }
};

/**
 * Another helper class for SelectionState.  Stack based class for doing
 * Will/DidMoveNode()
 */

class MOZ_STACK_CLASS AutoMoveNodeSelNotify final
{
private:
  RangeUpdater& mRangeUpdater;
  nsINode* mOldParent;
  nsINode* mNewParent;
  int32_t mOldOffset;
  int32_t mNewOffset;

public:
  AutoMoveNodeSelNotify(RangeUpdater& aRangeUpdater,
                        nsINode* aOldParent,
                        int32_t aOldOffset,
                        nsINode* aNewParent,
                        int32_t aNewOffset)
    : mRangeUpdater(aRangeUpdater)
    , mOldParent(aOldParent)
    , mNewParent(aNewParent)
    , mOldOffset(aOldOffset)
    , mNewOffset(aNewOffset)
  {
    MOZ_ASSERT(aOldParent);
    MOZ_ASSERT(aNewParent);
    mRangeUpdater.WillMoveNode();
  }

  ~AutoMoveNodeSelNotify()
  {
    mRangeUpdater.DidMoveNode(mOldParent, mOldOffset, mNewParent, mNewOffset);
  }
};

} // namespace mozilla

#endif // #ifndef mozilla_SelectionState_h