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comparison: editor/libeditor/text/nsTextEditRules.h

editor/libeditor/text/nsTextEditRules.h

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef nsTextEditRules_h__
7 #define nsTextEditRules_h__
8
9 #include "nsCOMPtr.h"
10 #include "nsCycleCollectionParticipant.h"
11 #include "nsEditRules.h"
12 #include "nsEditor.h"
13 #include "nsIEditor.h"
14 #include "nsISupportsImpl.h"
15 #include "nsITimer.h"
16 #include "nsPlaintextEditor.h"
17 #include "nsString.h"
18 #include "nscore.h"
19
20 class nsIDOMElement;
21 class nsIDOMNode;
22 class nsISelection;
23 namespace mozilla {
24 namespace dom {
25 class Selection;
26 } // namespace dom
27 } // namespace mozilla
28
29 /** Object that encapsulates HTML text-specific editing rules.
30 *
31 * To be a good citizen, edit rules must live by these restrictions:
32 * 1. All data manipulation is through the editor.
33 * Content nodes in the document tree must <B>not</B> be manipulated directly.
34 * Content nodes in document fragments that are not part of the document itself
35 * may be manipulated at will. Operations on document fragments must <B>not</B>
36 * go through the editor.
37 * 2. Selection must not be explicitly set by the rule method.
38 * Any manipulation of Selection must be done by the editor.
39 */
40 class nsTextEditRules : public nsIEditRules, public nsITimerCallback
41 {
42 public:
43 NS_DECL_NSITIMERCALLBACK
44 NS_DECL_CYCLE_COLLECTING_ISUPPORTS
45 NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsTextEditRules, nsIEditRules)
46
47 nsTextEditRules();
48 virtual ~nsTextEditRules();
49
50 // nsIEditRules methods
51 NS_IMETHOD Init(nsPlaintextEditor *aEditor);
52 NS_IMETHOD SetInitialValue(const nsAString& aValue);
53 NS_IMETHOD DetachEditor();
54 NS_IMETHOD BeforeEdit(EditAction action,
55 nsIEditor::EDirection aDirection);
56 NS_IMETHOD AfterEdit(EditAction action,
57 nsIEditor::EDirection aDirection);
58 NS_IMETHOD WillDoAction(mozilla::dom::Selection* aSelection,
59 nsRulesInfo* aInfo, bool* aCancel, bool* aHandled);
60 NS_IMETHOD DidDoAction(nsISelection *aSelection, nsRulesInfo *aInfo, nsresult aResult);
61 NS_IMETHOD DocumentIsEmpty(bool *aDocumentIsEmpty);
62 NS_IMETHOD DocumentModified();
63
64 public:
65 void ResetIMETextPWBuf();
66
67 /**
68 * Handles the newline characters either according to aNewLineHandling
69 * or to the default system prefs if aNewLineHandling is negative.
70 *
71 * @param aString the string to be modified in place.
72 * @param aNewLineHandling determine the desired type of newline handling:
73 * * negative values:
74 * handle newlines according to platform defaults.
75 * * nsIPlaintextEditor::eNewlinesReplaceWithSpaces:
76 * replace newlines with spaces.
77 * * nsIPlaintextEditor::eNewlinesStrip:
78 * remove newlines from the string.
79 * * nsIPlaintextEditor::eNewlinesReplaceWithCommas:
80 * replace newlines with commas.
81 * * nsIPlaintextEditor::eNewlinesStripSurroundingWhitespace:
82 * collapse newlines and surrounding whitespace characters and
83 * remove them from the string.
84 * * nsIPlaintextEditor::eNewlinesPasteIntact:
85 * only remove the leading and trailing newlines.
86 * * nsIPlaintextEditor::eNewlinesPasteToFirst or any other value:
87 * remove the first newline and all characters following it.
88 */
89 static void HandleNewLines(nsString &aString, int32_t aNewLineHandling);
90
91 /**
92 * Prepare a string buffer for being displayed as the contents of a password
93 * field. This function uses the platform-specific character for representing
94 * characters entered into password fields.
95 *
96 * @param aOutString the output string. When this function returns,
97 * aOutString will contain aLength password characters.
98 * @param aLength the number of password characters that aOutString should
99 * contain.
100 */
101 static void FillBufWithPWChars(nsAString *aOutString, int32_t aLength);
102
103 protected:
104
105 void InitFields();
106
107 // nsTextEditRules implementation methods
108 nsresult WillInsertText( EditAction aAction,
109 mozilla::dom::Selection* aSelection,
110 bool *aCancel,
111 bool *aHandled,
112 const nsAString *inString,
113 nsAString *outString,
114 int32_t aMaxLength);
115 nsresult DidInsertText(nsISelection *aSelection, nsresult aResult);
116 nsresult GetTopEnclosingPre(nsIDOMNode *aNode, nsIDOMNode** aOutPreNode);
117
118 nsresult WillInsertBreak(mozilla::dom::Selection* aSelection, bool* aCancel,
119 bool *aHandled, int32_t aMaxLength);
120 nsresult DidInsertBreak(nsISelection *aSelection, nsresult aResult);
121
122 nsresult WillInsert(nsISelection *aSelection, bool *aCancel);
123 nsresult DidInsert(nsISelection *aSelection, nsresult aResult);
124
125 nsresult WillDeleteSelection(mozilla::dom::Selection* aSelection,
126 nsIEditor::EDirection aCollapsedAction,
127 bool *aCancel,
128 bool *aHandled);
129 nsresult DidDeleteSelection(nsISelection *aSelection,
130 nsIEditor::EDirection aCollapsedAction,
131 nsresult aResult);
132
133 nsresult WillSetTextProperty(nsISelection *aSelection, bool *aCancel, bool *aHandled);
134 nsresult DidSetTextProperty(nsISelection *aSelection, nsresult aResult);
135
136 nsresult WillRemoveTextProperty(nsISelection *aSelection, bool *aCancel, bool *aHandled);
137 nsresult DidRemoveTextProperty(nsISelection *aSelection, nsresult aResult);
138
139 nsresult WillUndo(nsISelection *aSelection, bool *aCancel, bool *aHandled);
140 nsresult DidUndo(nsISelection *aSelection, nsresult aResult);
141
142 nsresult WillRedo(nsISelection *aSelection, bool *aCancel, bool *aHandled);
143 nsresult DidRedo(nsISelection *aSelection, nsresult aResult);
144
145 /** called prior to nsIEditor::OutputToString
146 * @param aSelection
147 * @param aInFormat the format requested for the output, a MIME type
148 * @param aOutText the string to use for output, if aCancel is set to true
149 * @param aOutCancel if set to true, the caller should cancel the operation
150 * and use aOutText as the result.
151 */
152 nsresult WillOutputText(nsISelection *aSelection,
153 const nsAString *aInFormat,
154 nsAString *aOutText,
155 bool *aOutCancel,
156 bool *aHandled);
157
158 nsresult DidOutputText(nsISelection *aSelection, nsresult aResult);
159
160
161 // helper functions
162
163 /** check for and replace a redundant trailing break */
164 nsresult RemoveRedundantTrailingBR();
165
166 /** creates a trailing break in the text doc if there is not one already */
167 nsresult CreateTrailingBRIfNeeded();
168
169 /** creates a bogus text node if the document has no editable content */
170 nsresult CreateBogusNodeIfNeeded(nsISelection *aSelection);
171
172 /** returns a truncated insertion string if insertion would place us
173 over aMaxLength */
174 nsresult TruncateInsertionIfNeeded(mozilla::dom::Selection* aSelection,
175 const nsAString *aInString,
176 nsAString *aOutString,
177 int32_t aMaxLength,
178 bool *aTruncated);
179
180 /** Remove IME composition text from password buffer */
181 void RemoveIMETextFromPWBuf(int32_t &aStart, nsAString *aIMEString);
182
183 nsresult CreateMozBR(nsIDOMNode* inParent, int32_t inOffset,
184 nsIDOMNode** outBRNode = nullptr);
185
186 nsresult CheckBidiLevelForDeletion(nsISelection *aSelection,
187 nsIDOMNode *aSelNode,
188 int32_t aSelOffset,
189 nsIEditor::EDirection aAction,
190 bool *aCancel);
191
192 nsresult HideLastPWInput();
193
194 nsresult CollapseSelectionToTrailingBRIfNeeded(nsISelection *aSelection);
195
196 bool IsPasswordEditor() const
197 {
198 return mEditor ? mEditor->IsPasswordEditor() : false;
199 }
200 bool IsSingleLineEditor() const
201 {
202 return mEditor ? mEditor->IsSingleLineEditor() : false;
203 }
204 bool IsPlaintextEditor() const
205 {
206 return mEditor ? mEditor->IsPlaintextEditor() : false;
207 }
208 bool IsReadonly() const
209 {
210 return mEditor ? mEditor->IsReadonly() : false;
211 }
212 bool IsDisabled() const
213 {
214 return mEditor ? mEditor->IsDisabled() : false;
215 }
216 bool IsMailEditor() const
217 {
218 return mEditor ? mEditor->IsMailEditor() : false;
219 }
220 bool DontEchoPassword() const
221 {
222 return mEditor ? mEditor->DontEchoPassword() : false;
223 }
224
225 // data members
226 nsPlaintextEditor *mEditor; // note that we do not refcount the editor
227 nsString mPasswordText; // a buffer we use to store the real value of password editors
228 nsString mPasswordIMEText; // a buffer we use to track the IME composition string
229 uint32_t mPasswordIMEIndex;
230 nsCOMPtr<nsIDOMNode> mBogusNode; // magic node acts as placeholder in empty doc
231 nsCOMPtr<nsIDOMNode> mCachedSelectionNode; // cached selected node
232 int32_t mCachedSelectionOffset; // cached selected offset
233 uint32_t mActionNesting;
234 bool mLockRulesSniffing;
235 bool mDidExplicitlySetInterline;
236 bool mDeleteBidiImmediately; // in bidirectional text, delete
237 // characters not visually
238 // adjacent to the caret without
239 // moving the caret first.
240 EditAction mTheAction; // the top level editor action
241 nsCOMPtr<nsITimer> mTimer;
242 uint32_t mLastStart, mLastLength;
243
244 // friends
245 friend class nsAutoLockRulesSniffing;
246
247 };
248
249
250
251 class nsTextRulesInfo : public nsRulesInfo
252 {
253 public:
254
255 nsTextRulesInfo(EditAction aAction) :
256 nsRulesInfo(aAction),
257 inString(0),
258 outString(0),
259 outputFormat(0),
260 maxLength(-1),
261 collapsedAction(nsIEditor::eNext),
262 stripWrappers(nsIEditor::eStrip),
263 bOrdered(false),
264 entireList(false),
265 bulletType(0),
266 alignType(0),
267 blockType(0),
268 insertElement(0)
269 {}
270
271 virtual ~nsTextRulesInfo() {}
272
273 // kInsertText
274 const nsAString *inString;
275 nsAString *outString;
276 const nsAString *outputFormat;
277 int32_t maxLength;
278
279 // kDeleteSelection
280 nsIEditor::EDirection collapsedAction;
281 nsIEditor::EStripWrappers stripWrappers;
282
283 // kMakeList
284 bool bOrdered;
285 bool entireList;
286 const nsAString *bulletType;
287
288 // kAlign
289 const nsAString *alignType;
290
291 // kMakeBasicBlock
292 const nsAString *blockType;
293
294 // kInsertElement
295 const nsIDOMElement* insertElement;
296 };
297
298
299 /***************************************************************************
300 * stack based helper class for StartOperation()/EndOperation() sandwich.
301 * this class sets a bool letting us know to ignore any rules sniffing
302 * that tries to occur reentrantly.
303 */
304 class nsAutoLockRulesSniffing
305 {
306 public:
307
308 nsAutoLockRulesSniffing(nsTextEditRules *rules) : mRules(rules)
309 {if (mRules) mRules->mLockRulesSniffing = true;}
310 ~nsAutoLockRulesSniffing()
311 {if (mRules) mRules->mLockRulesSniffing = false;}
312
313 protected:
314 nsTextEditRules *mRules;
315 };
316
317
318
319 /***************************************************************************
320 * stack based helper class for turning on/off the edit listener.
321 */
322 class nsAutoLockListener
323 {
324 public:
325
326 nsAutoLockListener(bool *enabled) : mEnabled(enabled)
327 {if (mEnabled) { mOldState=*mEnabled; *mEnabled = false;}}
328 ~nsAutoLockListener()
329 {if (mEnabled) *mEnabled = mOldState;}
330
331 protected:
332 bool *mEnabled;
333 bool mOldState;
334 };
335
336 #endif //nsTextEditRules_h__

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